Match list I (Solutions of salts of...) with list II (pH of the solution is given by) and select the correct answer using the codes given below the lists: List I List II Weak acid and strong base (p) \[\frac{1}{2}p{{K}_{w}}\] Strong acid and weak base (q) \[\frac{1}{2}(p{{K}_{w}}-p{{K}_{b}}+p{{K}_{a}})\] Weak acid and weak base (r) \[\frac{1}{2}(p{{K}_{w}}-p{{K}_{b}}-\log \,\,C)\] Strong acid and strong base (s) \[\frac{1}{2}(p{{K}_{w}}+p{{K}_{a}}+\log \,\,C)\] Codes:

A\[\to \]s, B\[\to \]r, C\[\to \]p, D\[\to \]q

A\[\to \]p, B\[\to \]q, C\[\to \]r, D\[\to \]s

A\[\to \]s, B\[\to \]r, C\[\to \]q, D\[\to \]p

A\[\to \]s, B\[\to \]r, C\[\to \]p, D\[\to \]q

A\[\to \]r, B\[\to \]s, C\[\to \]q, D\[\to \]p

The presence of \[N{{H}_{4}}Cl\] in the test solution while precipitating group III-A hydroxides (in qualitative inorganic analysis) helps in

Lowering \[\left[ N{{H}_{4}}OH \right]\]

Lowering \[\left[ O{{H}^{-}} \right]\]

Lowering \[\left[ N{{H}_{4}}OH \right]\]

Increasing \[\left[ O{{H}^{-}} \right]\]

Increasing \[\left[ N{{H}_{4}}OH \right]\]

In any period the valency of an element with respect to oxygen [Kerala (Med.) 2003]

Decreases one by one from IA to IVA and then increases from VA to VIIA one by one

Increases one by one from IA to VIIA

Decreases one by one form IA to VIIA

Increases one by one from IA to IVA and then decreases from VA to VIIA one by one

Decreases one by one from IA to IVA and then increases from VA to VIIA one by one

The reaction of propene with HOCl proceeds via the addition of [IIT-JEE (Screening) 2001]

\[C{{l}^{+}}\]in the first step

\[O{{H}^{-}}\]in the first step

\[C{{l}^{+}}\]and \[O{{H}^{-}}\]in a single step

Invertase brings about the conversion of [KCET 1986]

Sucrose to glucose and fructose

Glucose to \[{{C}_{2}}{{H}_{5}}OH\] and \[C{{O}_{2}}\]

Which one of the following is not correct [MP PMT 1997]

\[_{33}A{{s}^{75}}+{{\,}_{2}}H{{e}^{4}}\to {{\,}_{35}}B{{r}^{78}}+{{\,}_{0}}{{n}^{1}}\]

\[_{3}L{{i}^{7}}+{{\,}_{1}}{{H}^{1}}\to {{\,}_{4}}B{{e}^{7}}+{{\,}_{0}}{{n}^{1}}\]

\[_{21}S{{c}^{45}}+{{\,}_{0}}{{n}^{1}}\to {{\,}_{20}}C{{a}^{45}}+{{\,}_{0}}{{n}^{1}}\]

\[_{33}A{{s}^{75}}+{{\,}_{2}}H{{e}^{4}}\to {{\,}_{35}}B{{r}^{78}}+{{\,}_{0}}{{n}^{1}}\]

\[_{83}B{{i}^{209}}+{{\,}_{1}}{{H}^{2}}\to {{\,}_{84}}P{{o}^{210}}+{{\,}_{0}}{{n}^{1}}\]

Incorrect statement about \[P{{H}_{3}}\] is:

It is produced by hydrolysis of \[C{{a}_{2}}{{P}_{2}}\].

It gives black ppt. \[(C{{u}_{3}}{{P}_{2}})\] with \[CuS{{O}_{4}}\]solution.

Spontaneously burns in presence of \[{{P}_{2}}{{H}_{2}}\].

It does not react with \[{{B}_{2}}{{H}_{6}}\].

Lead pipes are not suitable for drinking water because

a layer of lead dioxide is deposited over pipes

lead forms basic lead carbonate

lead reacts with water containing air to form \[Pb{{(OH)}_{2}}\]

a layer of lead dioxide is deposited over pipes

lead reacts with air to form litharge

A solid A which has photographic effect reacts with the solution of a sodium salt B to give a pale yellow ppt. C. Sodium salt on heating gives brown vapour. Identify A, B and C. [Orissa JEE 2004]

\[AgN{{O}_{3}},NaCl,AgC{{l}_{2}}\]

\[AgN{{O}_{3}},NaBr,AgC{{l}_{2}}\]

The frequency of radiation emitted when the electron falls from \[n=4\] to \[n=1\] in a hydrogen atom will be (Given ionization energy of H\[=2.18\times {{10}^{-18}}J\,\,\,\text{ato}{{\text{m}}^{-1}}\]and \[h=6.625\times {{10}^{-34}}Js\]) [CBSE PMT 2004]

\[2.00\times {{10}^{15}}{{s}^{-1}}\]

\[3.08\times {{10}^{15}}{{s}^{-1}}\]

\[2.00\times {{10}^{15}}{{s}^{-1}}\]

\[1.54\times {{10}^{15}}{{s}^{-1}}\]

\[1.03\times {{10}^{15}}{{s}^{-1}}\]

An emulsifier [MP PET 1995]

Aids the flocculation of emulsion

11242 + Mcqs in Chemistry in Joint Entrance Exam - Main (JEE Main) Page 2 McqOptions

51.	Which of the following option is correct about \[N{{O}_{2}}\And Cl{{O}_{2}}?\] (i) Both are paramagnetic species (ii) Both compounds dimerised readily (iii) Both have \[s{{p}^{2}}\] hybridisation (iv) Both have Bent shape.
A.	(i), (ii)
B.	(i), (iii), (iv)
C.	(ii), (iii), (iv)
D.	only (i)
Answer» C. (ii), (iii), (iv)

Discussion

52.	The de Broglie wavelength of a car of mass 1000 kg and velocity 36 km/hr is:
A.	\[6.626\times {{10}^{-34}}m\]
B.	\[6.626\times {{10}^{-38}}m\]
C.	\[6.626\times {{10}^{-31}}m\]
D.	\[6.626\times {{10}^{-30}}m\]
Answer» C. \[6.626\times {{10}^{-31}}m\]

Discussion

53.	Match list I (Solutions of salts of...) with list II (pH of the solution is given by) and select the correct answer using the codes given below the lists: List I List II Weak acid and strong base (p) \[\frac{1}{2}p{{K}_{w}}\] Strong acid and weak base (q) \[\frac{1}{2}(p{{K}_{w}}-p{{K}_{b}}+p{{K}_{a}})\] Weak acid and weak base (r) \[\frac{1}{2}(p{{K}_{w}}-p{{K}_{b}}-\log \,\,C)\] Strong acid and strong base (s) \[\frac{1}{2}(p{{K}_{w}}+p{{K}_{a}}+\log \,\,C)\] Codes:
A.	A\[\to \]p, B\[\to \]q, C\[\to \]r, D\[\to \]s
B.	A\[\to \]s, B\[\to \]r, C\[\to \]q, D\[\to \]p
C.	A\[\to \]s, B\[\to \]r, C\[\to \]p, D\[\to \]q
D.	A\[\to \]r, B\[\to \]s, C\[\to \]q, D\[\to \]p
Answer» C. A\[\to \]s, B\[\to \]r, C\[\to \]p, D\[\to \]q

Discussion

54.	Average atomic mass of magnesium is 24.32 amu. This Mg is composed of 79 mole % of \[^{24}Mg\] and remaining 21 mole % of \[^{25}Mg\] and \[^{26}Mg\]. Calculate the mole % of \[^{25}Mg\]
A.	0.1
B.	0.2
C.	0.22
D.	0.11
Answer» E.

Discussion

55.	Which of the following compounds will exhibit geometrical isomerism [IIT-JEE Screening 2000]
A.	1-phenyl-2-butene
B.	3-phenyl-1-butene
C.	2-phenyl-1-butene
D.	1, 1-Diphenyl-1-propene
Answer» B. 3-phenyl-1-butene

Discussion

56.	On bromination, propionic acid yields two isomeric 2-bromopropionic acids. This pair is an important example of [BHU 2000]
A.	Chain isomers
B.	Optical isomers
C.	Cis-trans isomers
D.	Position isomers
Answer» C. Cis-trans isomers

Discussion

57.	Geometrical isomerism is not possible in [CPMT 2000]
A.	Propene
B.	3-hexane
C.	Butenedioic acid
D.	Cyclic compound
Answer» B. 3-hexane

Discussion

58.	Which will show maximum non-metallic character [UPSEAT 2003]
A.	B
B.	Be
C.	Mg
D.	Al
Answer» B. Be

Discussion

59.	The presence of \[N{{H}_{4}}Cl\] in the test solution while precipitating group III-A hydroxides (in qualitative inorganic analysis) helps in
A.	Lowering \[\left[ O{{H}^{-}} \right]\]
B.	Lowering \[\left[ N{{H}_{4}}OH \right]\]
C.	Increasing \[\left[ O{{H}^{-}} \right]\]
D.	Increasing \[\left[ N{{H}_{4}}OH \right]\]
Answer» B. Lowering \[\left[ N{{H}_{4}}OH \right]\]

Discussion

60.	In any period the valency of an element with respect to oxygen [Kerala (Med.) 2003]
A.	Increases one by one from IA to VIIA
B.	Decreases one by one form IA to VIIA
C.	Increases one by one from IA to IVA and then decreases from VA to VIIA one by one
D.	Decreases one by one from IA to IVA and then increases from VA to VIIA one by one
Answer» D. Decreases one by one from IA to IVA and then increases from VA to VIIA one by one

Discussion

61.	The largest bond angle is in [DCE 2002; MNR 1984]
A.	\[As{{H}_{3}}\]
B.	\[N{{H}_{3}}\]
C.	\[{{H}_{2}}O\]
D.	\[P{{H}_{3}}\]
Answer» C. \[{{H}_{2}}O\]

Discussion

62.	How many grams of \[NaOH\] will be required to prepare 250 ml of 0.1 M solution [EAMCET 1978]
A.	1 gm
B.	4 gms
C.	40 gms
D.	10 gms
Answer» B. 4 gms

Discussion

63.	The reaction of propene with HOCl proceeds via the addition of [IIT-JEE (Screening) 2001]
A.	\[{{H}^{+}}\]in the first step
B.	\[C{{l}^{+}}\]in the first step
C.	\[O{{H}^{-}}\]in the first step
D.	\[C{{l}^{+}}\]and \[O{{H}^{-}}\]in a single step
Answer» E.

Discussion

64.	Sulphuric acid reacts with \[PC{{l}_{5}}\] to give
A.	thionyl chloride
B.	sulphur monochloride
C.	sulphuryl chloride
D.	sulphur tetrachloride
Answer» D. sulphur tetrachloride

Discussion

65.	Among the following the weakest one is [Pb. PMT 2004; CPMT 2002]
A.	Metallic bond
B.	Ionic bond
C.	Van der Waal's force
D.	Covalent bond
Answer» D. Covalent bond

Discussion

66.	Invertase brings about the conversion of [KCET 1986]
A.	Starch to glucose
B.	Sucrose to glucose and fructose
C.	Maltose to glucose
D.	Glucose to \[{{C}_{2}}{{H}_{5}}OH\] and \[C{{O}_{2}}\]
Answer» C. Maltose to glucose

Discussion

67.	Which one of the following is not correct [MP PMT 1997]
A.	\[_{3}L{{i}^{7}}+{{\,}_{1}}{{H}^{1}}\to {{\,}_{4}}B{{e}^{7}}+{{\,}_{0}}{{n}^{1}}\]
B.	\[_{21}S{{c}^{45}}+{{\,}_{0}}{{n}^{1}}\to {{\,}_{20}}C{{a}^{45}}+{{\,}_{0}}{{n}^{1}}\]
C.	\[_{33}A{{s}^{75}}+{{\,}_{2}}H{{e}^{4}}\to {{\,}_{35}}B{{r}^{78}}+{{\,}_{0}}{{n}^{1}}\]
D.	\[_{83}B{{i}^{209}}+{{\,}_{1}}{{H}^{2}}\to {{\,}_{84}}P{{o}^{210}}+{{\,}_{0}}{{n}^{1}}\]
Answer» C. \[_{33}A{{s}^{75}}+{{\,}_{2}}H{{e}^{4}}\to {{\,}_{35}}B{{r}^{78}}+{{\,}_{0}}{{n}^{1}}\]

Discussion

68.	A compound (A) is used in preparation of washing soda to recover ammonia in Solvay's process. When\[C{{O}_{2}}\]. is bubbled through an aqueous solution of (A), the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A?
A.	\[Ca{{(HC{{O}_{3}})}_{2}}\]
B.	\[CaO\]
C.	\[Ca{{(OH)}_{2}}\]
D.	\[CaC{{O}_{3}}\]
Answer» D. \[CaC{{O}_{3}}\]

Discussion

69.	Which of the following gives a ppt. with \[Pb{{\left( N{{O}_{3}} \right)}_{2}}\] but not with \[Ba{{\left( N{{O}_{3}} \right)}_{2}}\] [CPMT 1979; MP PET 1997]
A.	\[NaCl\]
B.	Sodium acetate
C.	Sodium nitrate
D.	Sodium hydrogen phosphate
Answer» B. Sodium acetate

Discussion

70.	The indicator used in the titration of iodine against sodium thiosulphate is [AFMC 2002]
A.	Starch
B.	\[{{K}_{3}}Fe{{(CN)}_{6}}\]
C.	\[{{K}_{2}}Cr{{O}_{4}}\]
D.	Potassium
Answer» B. \[{{K}_{3}}Fe{{(CN)}_{6}}\]

Discussion

71.	The standard cell potential of \[Zn\|Z{{n}^{2+}}_{(aq)}\|\|C{{u}^{2+}}_{(aq)}\|Cu\] cell is 1.10 V. The maximum work obtained by this cell will be [MP PET 2002]
A.	106.15 kJ
B.	? 212.30 kJ
C.	? 318.45 kJ
D.	? 424.60 kJ
Answer» C. ? 318.45 kJ

Discussion

72.	Incorrect statement about \[P{{H}_{3}}\] is:
A.	It is produced by hydrolysis of \[C{{a}_{2}}{{P}_{2}}\].
B.	It gives black ppt. \[(C{{u}_{3}}{{P}_{2}})\] with \[CuS{{O}_{4}}\]solution.
C.	Spontaneously burns in presence of \[{{P}_{2}}{{H}_{2}}\].
D.	It does not react with \[{{B}_{2}}{{H}_{6}}\].
Answer» E.

Discussion

73.	5 ml of N HCl, 20 ml of \[N/2\,\,{{H}_{2}}S{{O}_{4}}\] and 30 ml of \[N/3\,\,HN{{O}_{3}}\] are mixed together and volume made to one litre. The normality of the resulting solution is [MNR 1991]
A.	\[N/5\]
B.	\[N/10\]
C.	\[N/20\]
D.	\[N/40\]
Answer» E.

Discussion

74.	Indigestible carbohydrate, which is also a constituent of our diet, is [Kerala (Med.) 1999]
A.	Cellulose
B.	Galactose
C.	Maltose
D.	Starch
Answer» B. Galactose

Discussion

75.	Consider the following sequence of reaction. \[Na+N{{H}_{3}}\left( g \right)\xrightarrow{{}}\left[ X \right]\xrightarrow{{{N}_{2}}O}\] \[\left[ Y \right]\xrightarrow{Heat}\underset{Gas\,Pure}{\mathop{\left[ Z \right]}}\,\] Identify (Z) gas:
A.	\[{{N}_{2}}\]
B.	\[N{{H}_{3}}\]
C.	\[{{O}_{2}}\]
D.	\[{{H}_{2}}\]
Answer» B. \[N{{H}_{3}}\]

Discussion

76.	What is the volume of \[C{{O}_{2}}\] liberated (in litres) at 1 atmosphere and \[0{}^\circ C\] when 10 g of 100% pure calcium carbonate is treated with excess dilute sulphuric acid?(Atomic mass \[Ca:40,\text{ }C:12,O:16\])
A.	0.224
B.	2.24
C.	22.4
D.	224
Answer» C. 22.4

Discussion

77.	Lead pipes are not suitable for drinking water because
A.	lead forms basic lead carbonate
B.	lead reacts with water containing air to form \[Pb{{(OH)}_{2}}\]
C.	a layer of lead dioxide is deposited over pipes
D.	lead reacts with air to form litharge
Answer» C. a layer of lead dioxide is deposited over pipes

Discussion

78.	Which of the following is not used to construct salt bridge [MP PET 2003]
A.	\[C{{H}_{3}}COOK\]
B.	\[KCl\]
C.	\[N{{H}_{4}}N{{O}_{3}}\]
D.	\[KN{{O}_{3}}\]
Answer» B. \[KCl\]

Discussion

79.	If hydrogen electrode dipped in 2 solution of \[pH=3\] and \[pH=6\] and salt bridge is connected the e.m.f. of resulting cell is [DPMT 2005]
A.	0.177 V
B.	0.3 V
C.	0.052 V
D.	0.104 V
Answer» B. 0.3 V

Discussion

80.	0.16 gm of a dibasic acid required 25 ml of decinormal \[NaOH\] solution for complete neutralization. The molecular weight of the acid is [CPMT 1989; MP PET 1993]
A.	32
B.	64
C.	128
D.	256
Answer» D. 256

Discussion

81.	Under which category iodine crystals are placed among the following
A.	Ionic crystal
B.	Metallic crystal
C.	Molecular crystal
D.	Covalent crystal
Answer» D. Covalent crystal

Discussion

82.	Assuming fully decomposed, the volume of \[C{{O}_{2}}\]released at STP on heating 9.85g of \[BaC{{O}_{3}}\](Atomic mass of Ba=137) will be [CBSE PMT 2000]
A.	0.84 L
B.	2.24 L
C.	4.06 L
D.	1.12 L
Answer» E.

Discussion

83.	Which one of the following ions has the highest value of ionic radius [AIEEE 2004]
A.	\[{{O}^{2-}}\]
B.	\[{{B}^{3+}}\]
C.	\[L{{i}^{+}}\]
D.	\[{{F}^{-}}\]
Answer» B. \[{{B}^{3+}}\]

Discussion

84.	Consider the following reaction occuring in an automobile engine : \[2{{C}_{8}}{{H}_{18}}(l)+25\,{{O}_{2}}(g)\to 16\,C{{O}_{2}}(g)+18\,{{H}_{2}}O(g)\] of \[\Delta H,\,\Delta S\] and \[\Delta G\] would be:
A.	- + +
B.	- - +
C.	+ + -
D.	- + -
Answer» E.

Discussion

85.	A brown ring appears in the test for [EAMCET 1978; KCET 1991; Bihar CEE 1995; AIIMS 1996; DCE 1999]
A.	Nitrate
B.	Nitrite
C.	Bromide
D.	Iron
Answer» B. Nitrite

Discussion

86.	Visible range of hydrogen spectrum will contain the following series [RPET 2000]
A.	Pfund
B.	Lyman
C.	Balmer
D.	Brackett
Answer» D. Brackett

Discussion

87.	Which of the following oxides of nitrogen is isoelectronic with \[C{{O}_{2}}\] [CBSE PMT 1990]
A.	\[N{{O}_{2}}\]
B.	\[{{N}_{2}}O\]
C.	\[NO\]
D.	\[{{N}_{2}}{{O}_{2}}\]
Answer» C. \[NO\]

Discussion

88.	If solubility of calcium hydroxide is \[\sqrt{3}\], then its solubility product will be [MH CET 2002]
A.	27
B.	3
C.	9
D.	\[12\sqrt{3}\]
Answer» E.

Discussion

89.	An alkane forms isomers if the number of least carbon atom is [CPMT 1976; BHU 1985, 89]
A.	1
B.	2
C.	3
D.	4
Answer» E.

Discussion

90.	A solid A which has photographic effect reacts with the solution of a sodium salt B to give a pale yellow ppt. C. Sodium salt on heating gives brown vapour. Identify A, B and C. [Orissa JEE 2004]
A.	\[AgN{{O}_{3}},NaBr,AgBr\]
B.	\[AgN{{O}_{3}},NaCl,AgC{{l}_{2}}\]
C.	\[AgN{{O}_{3}},NaBr,AgC{{l}_{2}}\]
D.	\[AgCl,NaBr,AgB{{r}_{2}}\]
Answer» B. \[AgN{{O}_{3}},NaCl,AgC{{l}_{2}}\]

Discussion

91.	In the equation \[{{H}_{2}}S+2HN{{O}_{3}}\to 2{{H}_{2}}O+2N{{O}_{2}}+S\] The equivalent weight of hydrogen sulphide is [BVP 2003]
A.	16
B.	68
C.	34
D.	17
Answer» E.

Discussion

92.	The frequency of radiation emitted when the electron falls from \[n=4\] to \[n=1\] in a hydrogen atom will be (Given ionization energy of H\[=2.18\times {{10}^{-18}}J\,\,\,\text{ato}{{\text{m}}^{-1}}\]and \[h=6.625\times {{10}^{-34}}Js\]) [CBSE PMT 2004]
A.	\[3.08\times {{10}^{15}}{{s}^{-1}}\]
B.	\[2.00\times {{10}^{15}}{{s}^{-1}}\]
C.	\[1.54\times {{10}^{15}}{{s}^{-1}}\]
D.	\[1.03\times {{10}^{15}}{{s}^{-1}}\]
Answer» B. \[2.00\times {{10}^{15}}{{s}^{-1}}\]

Discussion

93.	Chlorine water on standing loses its colour and forms:
A.	\[HCl\] only
B.	\[HCl\] and \[HCl{{O}_{2}}\]
C.	\[HCl\] and HOCl
D.	HOCl and \[HCl{{O}_{2}}\]
Answer» D. HOCl and \[HCl{{O}_{2}}\]

Discussion

94.	Ionic radii of
A.	\[T{{i}^{4+}}<M{{n}^{7+}}\]
B.	\[^{35}C{{l}^{-}}{{<}^{\,\,37}}C{{l}^{-}}\]
C.	\[{{K}^{+}}/C{{l}^{-}}\]
D.	\[{{P}^{3+}}>{{P}^{5+}}\]
Answer» E.

Discussion

95.	An emulsifier [MP PET 1995]
A.	Accelerates the dispersion
B.	Homogenises the emulsion
C.	Stabilizes the emulsion
D.	Aids the flocculation of emulsion
Answer» D. Aids the flocculation of emulsion

Discussion

96.	The gas evolved on heating \[Ca{{F}_{2}}\] and \[Si{{O}_{2}}\]with concentrated \[{{H}_{2}}S{{O}_{4}}\] on hydrolysis gives a white gelatinous precipitate. The precipitate is:
A.	hydrofluosilicic acid
B.	silica gel
C.	silicic acid
D.	calciumfluorosilicate
Answer» E.

Discussion

97.	25.4 g of \[{{I}_{2}}\] and 14.2 g of \[C{{l}_{2}}\] are made to react completely to yield a mixture of \[ICl\] and \[IC{{l}_{3}}\] Calculate moles of \[ICl\] and\[IC{{l}_{3}}\] formed
A.	0.1, 0.1
B.	0.2, 0.2
C.	0.1, 0.2
D.	0.2, 0.1
Answer» B. 0.2, 0.2

Discussion

98.	The energy of \[{{e}^{-}}\] in first orbit of \[H{{e}^{+}}\]is \[-871.6\times {{10}^{-20}}J.\] The energy of \[{{e}^{-}}\]in first orbit of H is:
A.	\[-871.6\times {{10}^{-20}}\]
B.	\[-435.8\times {{10}^{-20}}J\]
C.	\[-217.9\times {{10}^{-20}}J\]
D.	\[-108.9\times {{10}^{-20}}\]
Answer» D. \[-108.9\times {{10}^{-20}}\]

Discussion

99.	Which one of the following properties of an element is not variable [Bihar MADT 1981]
A.	Valency
B.	Atomic weight
C.	Equivalent weight
D.	All of these
Answer» C. Equivalent weight

Discussion

100.	The frequency of an electromagnetic radiation is \[2\times {{10}^{6}}Hz\]. What is its wavelength in metres (Velocity of light \[=3\times {{10}^{8}}m{{s}^{-1}}\])
A.	\[6.0\times {{10}^{14}}\]
B.	\[1.5\times {{10}^{4}}\]
C.	\[1.5\times {{10}^{2}}\]
D.	\[0.66\times {{10}^{-2}}\]
Answer» D. \[0.66\times {{10}^{-2}}\]

Discussion

Explore topic-wise MCQs in Joint Entrance Exam - Main (JEE Main).

Which of the following option is correct about \[N{{O}_{2}}\And Cl{{O}_{2}}?\] (i) Both are paramagnetic species (ii) Both compounds dimerised readily (iii) Both have \[s{{p}^{2}}\] hybridisation (iv) Both have Bent shape.

The de Broglie wavelength of a car of mass 1000 kg and velocity 36 km/hr is:

Average atomic mass of magnesium is 24.32 amu. This Mg is composed of 79 mole % of \[^{24}Mg\] and remaining 21 mole % of \[^{25}Mg\] and \[^{26}Mg\]. Calculate the mole % of \[^{25}Mg\]

Which of the following compounds will exhibit geometrical isomerism [IIT-JEE Screening 2000]

On bromination, propionic acid yields two isomeric 2-bromopropionic acids. This pair is an important example of [BHU 2000]

Geometrical isomerism is not possible in [CPMT 2000]

Which will show maximum non-metallic character [UPSEAT 2003]

The presence of \[N{{H}_{4}}Cl\] in the test solution while precipitating group III-A hydroxides (in qualitative inorganic analysis) helps in

In any period the valency of an element with respect to oxygen [Kerala (Med.) 2003]

The largest bond angle is in [DCE 2002; MNR 1984]

How many grams of \[NaOH\] will be required to prepare 250 ml of 0.1 M solution [EAMCET 1978]

The reaction of propene with HOCl proceeds via the addition of [IIT-JEE (Screening) 2001]

Sulphuric acid reacts with \[PC{{l}_{5}}\] to give

Among the following the weakest one is [Pb. PMT 2004; CPMT 2002]

Invertase brings about the conversion of [KCET 1986]

Which one of the following is not correct [MP PMT 1997]

A compound (A) is used in preparation of washing soda to recover ammonia in Solvay's process. When\[C{{O}_{2}}\]. is bubbled through an aqueous solution of (A), the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A?

Which of the following gives a ppt. with \[Pb{{\left( N{{O}_{3}} \right)}_{2}}\] but not with \[Ba{{\left( N{{O}_{3}} \right)}_{2}}\] [CPMT 1979; MP PET 1997]

The indicator used in the titration of iodine against sodium thiosulphate is [AFMC 2002]

The standard cell potential of \[Zn|Z{{n}^{2+}}_{(aq)}||C{{u}^{2+}}_{(aq)}|Cu\] cell is 1.10 V. The maximum work obtained by this cell will be [MP PET 2002]

Incorrect statement about \[P{{H}_{3}}\] is:

5 ml of N HCl, 20 ml of \[N/2\,\,{{H}_{2}}S{{O}_{4}}\] and 30 ml of \[N/3\,\,HN{{O}_{3}}\] are mixed together and volume made to one litre. The normality of the resulting solution is [MNR 1991]

Indigestible carbohydrate, which is also a constituent of our diet, is [Kerala (Med.) 1999]

Consider the following sequence of reaction. \[Na+N{{H}_{3}}\left( g \right)\xrightarrow{{}}\left[ X \right]\xrightarrow{{{N}_{2}}O}\] \[\left[ Y \right]\xrightarrow{Heat}\underset{Gas\,Pure}{\mathop{\left[ Z \right]}}\,\] Identify (Z) gas:

What is the volume of \[C{{O}_{2}}\] liberated (in litres) at 1 atmosphere and \[0{}^\circ C\] when 10 g of 100% pure calcium carbonate is treated with excess dilute sulphuric acid?(Atomic mass \[Ca:40,\text{ }C:12,O:16\])

Lead pipes are not suitable for drinking water because

Which of the following is not used to construct salt bridge [MP PET 2003]

If hydrogen electrode dipped in 2 solution of \[pH=3\] and \[pH=6\] and salt bridge is connected the e.m.f. of resulting cell is [DPMT 2005]

0.16 gm of a dibasic acid required 25 ml of decinormal \[NaOH\] solution for complete neutralization. The molecular weight of the acid is [CPMT 1989; MP PET 1993]

Under which category iodine crystals are placed among the following

Assuming fully decomposed, the volume of \[C{{O}_{2}}\]released at STP on heating 9.85g of \[BaC{{O}_{3}}\](Atomic mass of Ba=137) will be [CBSE PMT 2000]

Which one of the following ions has the highest value of ionic radius [AIEEE 2004]

Consider the following reaction occuring in an automobile engine : \[2{{C}_{8}}{{H}_{18}}(l)+25\,{{O}_{2}}(g)\to 16\,C{{O}_{2}}(g)+18\,{{H}_{2}}O(g)\] of \[\Delta H,\,\Delta S\] and \[\Delta G\] would be:

A brown ring appears in the test for [EAMCET 1978; KCET 1991; Bihar CEE 1995; AIIMS 1996; DCE 1999]

Visible range of hydrogen spectrum will contain the following series [RPET 2000]

Which of the following oxides of nitrogen is isoelectronic with \[C{{O}_{2}}\] [CBSE PMT 1990]

If solubility of calcium hydroxide is \[\sqrt{3}\], then its solubility product will be [MH CET 2002]

An alkane forms isomers if the number of least carbon atom is [CPMT 1976; BHU 1985, 89]

A solid A which has photographic effect reacts with the solution of a sodium salt B to give a pale yellow ppt. C. Sodium salt on heating gives brown vapour. Identify A, B and C. [Orissa JEE 2004]

In the equation \[{{H}_{2}}S+2HN{{O}_{3}}\to 2{{H}_{2}}O+2N{{O}_{2}}+S\] The equivalent weight of hydrogen sulphide is [BVP 2003]

The frequency of radiation emitted when the electron falls from \[n=4\] to \[n=1\] in a hydrogen atom will be (Given ionization energy of H\[=2.18\times {{10}^{-18}}J\,\,\,\text{ato}{{\text{m}}^{-1}}\]and \[h=6.625\times {{10}^{-34}}Js\]) [CBSE PMT 2004]

Chlorine water on standing loses its colour and forms:

Ionic radii of

An emulsifier [MP PET 1995]

The gas evolved on heating \[Ca{{F}_{2}}\] and \[Si{{O}_{2}}\]with concentrated \[{{H}_{2}}S{{O}_{4}}\] on hydrolysis gives a white gelatinous precipitate. The precipitate is:

25.4 g of \[{{I}_{2}}\] and 14.2 g of \[C{{l}_{2}}\] are made to react completely to yield a mixture of \[ICl\] and \[IC{{l}_{3}}\] Calculate moles of \[ICl\] and\[IC{{l}_{3}}\] formed

The energy of \[{{e}^{-}}\] in first orbit of \[H{{e}^{+}}\]is \[-871.6\times {{10}^{-20}}J.\] The energy of \[{{e}^{-}}\]in first orbit of H is:

Which one of the following properties of an element is not variable [Bihar MADT 1981]

The frequency of an electromagnetic radiation is \[2\times {{10}^{6}}Hz\]. What is its wavelength in metres (Velocity of light \[=3\times {{10}^{8}}m{{s}^{-1}}\])