If m and e are the mass and charge of the revolving electron in the orbit of radius r for hydrogen atom, the total energy of the revolving electron will be:

\[\frac{1}{2}\frac{{{e}^{2}}}{r}\]

\[-\frac{1}{2}\frac{{{e}^{2}}}{r}\]

\[A{{l}_{2}}{{O}_{3}}\] can be converted to anhydrous \[AlC{{l}_{3}}\] by heating

\[A{{l}_{2}}{{O}_{3}}\] wither gas

\[A{{l}_{2}}{{O}_{3}}\] with \[NaCl\] in solid state

a mixture of \[A{{l}_{2}}{{O}_{3}}\] and carbon in dry \[C{{l}_{2}}\] gas

\[A{{l}_{2}}{{O}_{3}}\] wither gas

\[A{{l}_{2}}{{O}_{3}}\] with \[HCl\] gas

A similarity between optical and geometrical isomerism is that [AIEEE 2002]

Each forms equal number of isomers for a given compound

If in a compound one is present then so is the other

Both are included in stereoisomerism

The disintegration constant of radium with half-life 1600 years is [MHCET 2004]

\[3.26\times {{10}^{-3}}yea{{r}^{-1}}\]

\[2.12\times {{10}^{-4}}yea{{r}^{-1}}\]

\[4.33\times {{10}^{-4}}yea{{r}^{-1}}\]

\[3.26\times {{10}^{-3}}yea{{r}^{-1}}\]

\[4.33\times {{10}^{-12}}yea{{r}^{-1}}\]

In hydrolysis of a salt of weak acid and strong base, \[{{A}^{-}}+{{H}_{2}}O\] ⇄ \[HA+O{{H}^{-}},\] the hydrolysis constant \[({{K}_{h}})\] is equal to.? [Orissa JEE 2002]

\[\frac{{{K}_{w}}}{{{K}_{b}}}\]

\[\frac{{{K}_{w}}}{{{K}_{a}}}\]

\[\frac{{{K}_{w}}}{{{K}_{b}}}\]

\[\frac{{{K}_{w}}}{{{K}_{a}}\times {{K}_{b}}}\]

When electric current is supplied through an ionic hydride of fused state, then [Kerala CET 2005]

Hydrogen is obtained at cathode

Hydride ion moves towards cathode

hydride ion present in solution

In which of the following pairs, there is greatest difference in the oxidation number of the underlined elements?

\[\underline{N}{{O}_{2}}\] and \[{{\underline{N}}_{2}}{{O}_{4}}\]

\[{{\underline{P}}_{2}}{{O}_{5}}\] and \[{{\underline{P}}_{4}}{{O}_{10}}\]

\[{{\underline{N}}_{2}}O\] and \[\underline{N}O\]

\[\underline{S}\,{{O}_{2}}\] and \[\underline{S}\,{{O}_{3}}\]

Hydrolysis constant for a salt of weak acid and weak base would be [RPMT 1999]

\[{{K}_{h}}=\frac{{{K}_{w}}}{{{K}_{a}}}\]

\[{{K}_{h}}=\frac{{{K}_{w}}}{{{K}_{b}}}\]

\[{{K}_{h}}=\frac{{{K}_{w}}}{{{K}_{a}}{{K}_{b}}}\]

Which of the following statements is true about \[\left[ Cu\,{{\left( N{{H}_{3}} \right)}_{4}} \right]S{{O}_{4}}\] [CPMT 1988]

It has coordinate and covalent bonds

It has only electrovalent bonds

It has electrovalent, covalent and coordinate bonds

\[{{H}_{2}}S\] gas when passed through a solution of a contains HCl precipitate the cations of group of qualitative analysis but not those belonging to the fourth group. It is because [CBSE PMT 2005]

Presence of HCl increases the sulphide ion concentration

Presence of HCl decreases the sulphide ion concentration

Presence of HCl increases the sulphide ion concentration

Solubility product of group II sulphides is more than that of group IV sulphides

Sulphides of group IV Cations are in \[HCl\]

A deep brown gas is formed by mixing two colourless gases which are

\[N{{O}_{2}}\] and \[{{O}_{2}}\]

1 mol of a gaseous aliphahatic compound\[{{C}_{n}}{{H}_{3n}}{{O}_{m}}\] is completely burnt in an excess of oxygen. The contraction in volume is (assume water get condensed out)

\[\left( 1+\frac{1}{2}n-\frac{3}{4}m \right)\]

\[\left( 1+\frac{3}{4}n-\frac{1}{4}m \right)\]

\[\left( 1-\frac{1}{2}n-\frac{3}{4}m \right)\]

\[\left( 1+\frac{3}{4}n-\frac{1}{2}m \right)\]

The order in which the following oxides are arranged according to decreasing basic nature is [CPMT 1985]

\[MgO,\,A{{l}_{2}}{{O}_{3}},\,CuO,\,N{{a}_{2}}O\]

\[N{{a}_{2}}O,\,MgO,\,A{{l}_{2}}{{O}_{3}},\,CuO\]

\[MgO,\,A{{l}_{2}}{{O}_{3}},\,CuO,\,N{{a}_{2}}O\]

\[A{{l}_{2}}{{O}_{3}},\,MgO,\,CuO,\,N{{a}_{2}}O\]

\[CuO,\,N{{a}_{2}}O,\,MgO,\,A{{l}_{2}}{{O}_{3}}\]

Which of the following is the correct reducing order of bond-angle [BHU 2000]

\[N{{H}_{3}}>{{H}_{2}}O>C{{H}_{4}}

\[{{C}_{2}}{{H}_{2}}>N{{H}_{3}}>{{H}_{2}}O

\[N{{H}_{3}}>{{H}_{2}}O>C{{H}_{4}}

Blue litmus turns red in which of the following mixture of acid and base?

\[100\,mL\] of \[1\times {{10}^{-2}}M\,HCl\]\[+\,100\,mL\] of \[1\times {{10}^{-2}}M\,NaOH\]

\[100\,mL\] of \[1\times {{10}^{-2}}M\,{{H}_{2}}S{{O}_{4}}\]\[+\,100\,mL\] of \[1\times {{10}^{-2}}M\,Ca{{\left( OH \right)}_{2}}\]

\[100\,mL\] of \[1\times {{10}^{-2}}M\,HCl\]+ \[100\,mL\] of \[1\times {{10}^{-2}}M\,Ba{{\left( OH \right)}_{2}}\]

\[100\,mL\] of \[1\times {{10}^{-2}}M\,{{H}_{2}}S{{O}_{4}}\]\[+\,10\,mL\] of \[1\times {{10}^{-2}}M\,NaOH\]

\[100\,mL\] of \[1\times {{10}^{-2}}M\,HCl\]\[+\,100\,mL\] of \[1\times {{10}^{-2}}M\,NaOH\]

11242 + Mcqs in Chemistry in Joint Entrance Exam - Main (JEE Main) Page 11 McqOptions

501.	The first artificial disintegration of an atomic nucleus was achieved by [Kerala (Engg.) 2002]
A.	Geiger
B.	Wilson
C.	Madame curie
D.	Rutherford
E.	Soddy
Answer» E. Soddy

Discussion

502.	Which one is a mixed salt [DPMT 1985]
A.	\[NaHS{{O}_{4}}\]
B.	\[NaKS{{O}_{4}}\]
C.	\[{{K}_{4}}Fe{{(CN)}_{6}}\]
D.	\[Mg(OH)Cl\]
Answer» C. \[{{K}_{4}}Fe{{(CN)}_{6}}\]

Discussion

503.	The molecule that will have minimum dipole moment is
A.	\[C{{H}_{3}}Cl\]
B.	\[C{{H}_{2}}Cl\]
C.	\[CHC{{l}_{3}}\]
D.	\[CFC{{l}_{3}}\]
Answer» E.

Discussion

504.	Which of the following molecule is not having perfect geometrical shape.
A.	\[PC{{l}_{3}}{{F}_{2}}\]
B.	\[C{{F}_{4}}\]
C.	\[B{{F}_{2}}Cl\]
D.	\[{{[Si{{F}_{6}}]}^{2-}}\]
Answer» D. \[{{[Si{{F}_{6}}]}^{2-}}\]

Discussion

505.	1, 2-Dichloroethene shows [RPET 1999]
A.	Geometrical isomerism
B.	Optical isomerism
C.	Ring-chain isomerism
D.	Resonance
Answer» B. Optical isomerism

Discussion

506.	The reagents \[N{{H}_{4}}Cl\] and aqueous \[N{{H}_{3}}\] will precipitate [IIT 1991]
A.	\[C{{a}^{2+}}\]
B.	\[A{{l}^{+3}}\]
C.	\[M{{g}^{2+}}\]
D.	\[Z{{n}^{2+}}\]
Answer» C. \[M{{g}^{2+}}\]

Discussion

507.	The atomic weight of an element is double its atomic number. If there are four electrons in \[2p\] orbital, the element is [AMU 1983]
A.	\[C\]
B.	\[N\]
C.	\[O\]
D.	\[Ca\]
Answer» D. \[Ca\]

Discussion

508.	Pure water can be obtained from sea water by [CBSE PMT 2001]
A.	Centrifugation
B.	Plasmolysis
C.	Reverse osmosis
D.	Sedimentation
Answer» D. Sedimentation

Discussion

509.	If m and e are the mass and charge of the revolving electron in the orbit of radius r for hydrogen atom, the total energy of the revolving electron will be:
A.	\[\frac{1}{2}\frac{{{e}^{2}}}{r}\]
B.	\[-\frac{{{e}^{2}}}{r}\]
C.	\[\frac{m{{e}^{2}}}{r}\]
D.	\[-\frac{1}{2}\frac{{{e}^{2}}}{r}\]
Answer» E.

Discussion

510.	\[A{{l}_{2}}{{O}_{3}}\] can be converted to anhydrous \[AlC{{l}_{3}}\] by heating
A.	\[A{{l}_{2}}{{O}_{3}}\] with \[NaCl\] in solid state
B.	a mixture of \[A{{l}_{2}}{{O}_{3}}\] and carbon in dry \[C{{l}_{2}}\] gas
C.	\[A{{l}_{2}}{{O}_{3}}\] wither gas
D.	\[A{{l}_{2}}{{O}_{3}}\] with \[HCl\] gas
Answer» C. \[A{{l}_{2}}{{O}_{3}}\] wither gas

Discussion

511.	Which of the following has correct increasing basic strength?
A.	\[MgO<BeO<CaO<BaO\]
B.	\[BeO<MgO<CaO<BaO\]
C.	\[BaO<CaO<MgO<BeO\]
D.	\[CaO<BaO<BeO<MgO\]
Answer» C. \[BaO<CaO<MgO<BeO\]

Discussion

512.	The bond angle in \[P{{H}_{3}}\]would be expected to be close to
A.	\[{{90}^{o}}\]
B.	\[{{105}^{o}}\]
C.	\[{{109}^{o}}\]
D.	\[{{120}^{o}}\]
Answer» B. \[{{105}^{o}}\]

Discussion

513.	Which of the following molecule contains asymmetric carbon atom [JIPMER 2002]
A.	\[C{{H}_{3}}CHClCOOH\]
B.	\[C{{H}_{3}}C{{H}_{2}}COOH\]
C.	\[ClC{{H}_{2}}C{{H}_{2}}COOH\]
D.	\[C{{l}_{2}}CHCOOH\]
Answer» B. \[C{{H}_{3}}C{{H}_{2}}COOH\]

Discussion

514.	A similarity between optical and geometrical isomerism is that [AIEEE 2002]
A.	Each forms equal number of isomers for a given compound
B.	If in a compound one is present then so is the other
C.	Both are included in stereoisomerism
D.	They have no similarity
Answer» D. They have no similarity

Discussion

515.	If the light waves pass through a nicol prism then all the oscillations occur only in one plane, such beam of light is called as [Kerala (Med.) 2002]
A.	Non-polarised light
B.	Plane polarised light
C.	Polarised light
D.	Optical light
Answer» C. Polarised light

Discussion

516.	The disintegration constant of radium with half-life 1600 years is [MHCET 2004]
A.	\[2.12\times {{10}^{-4}}yea{{r}^{-1}}\]
B.	\[4.33\times {{10}^{-4}}yea{{r}^{-1}}\]
C.	\[3.26\times {{10}^{-3}}yea{{r}^{-1}}\]
D.	\[4.33\times {{10}^{-12}}yea{{r}^{-1}}\]
Answer» C. \[3.26\times {{10}^{-3}}yea{{r}^{-1}}\]

Discussion

517.	In hydrolysis of a salt of weak acid and strong base, \[{{A}^{-}}+{{H}_{2}}O\] ⇄ \[HA+O{{H}^{-}},\] the hydrolysis constant \[({{K}_{h}})\] is equal to.? [Orissa JEE 2002]
A.	\[\frac{{{K}_{w}}}{{{K}_{a}}}\]
B.	\[\frac{{{K}_{w}}}{{{K}_{b}}}\]
C.	\[\sqrt{\frac{{{K}_{a}}}{C}}\]
D.	\[\frac{{{K}_{w}}}{{{K}_{a}}\times {{K}_{b}}}\]
Answer» B. \[\frac{{{K}_{w}}}{{{K}_{b}}}\]

Discussion

518.	Phenol is used in the manufacture of [AIIMS 1996]
A.	Bakelite
B.	Polystyrene
C.	Nylon
D.	PVC
Answer» B. Polystyrene

Discussion

519.	When electric current is supplied through an ionic hydride of fused state, then [Kerala CET 2005]
A.	Hydrogen is obtained at anode
B.	Hydrogen is obtained at cathode
C.	No change
D.	Hydride ion moves towards cathode
E.	hydride ion present in solution
Answer» B. Hydrogen is obtained at cathode

Discussion

520.	The energy of an electron in first Bohr orbit of Pi- atom is \[-13.6\text{ }eV\]. The energy value of electron in the excited state of \[L{{i}^{2+}}\] is:
A.	\[-27.2\text{ }eV\]
B.	\[30.6\text{ }eV\]
C.	\[-30.6eV\]
D.	\[27.2\text{ }eV\]
Answer» D. \[27.2\text{ }eV\]

Discussion

521.	If the amount of radioactive substance is increased three times, the number of atoms disintegrated per unit time would [MP PMT 1994]
A.	Be double
B.	Be triple
C.	Remain one third
D.	Not change
Answer» C. Remain one third

Discussion

522.	The equivalent weight of an element is 4. Its chloride has a V.D 59.25. Then the valency of the element is [BHU 1997]
A.	4
B.	3
C.	2
D.	1
Answer» C. 2

Discussion

523.	The isoelectronic pair is [AIIMS 2005]
A.	\[C{{l}_{2}}O,\ ICl_{2}^{-}\]
B.	\[ICl_{2}^{-},Cl{{O}_{2}}\ \]
C.	\[IF_{2}^{+},\ I_{3}^{-}\]
D.	\[ClO_{2}^{-},\ CIF_{2}^{+}\]
Answer» E.

Discussion

524.	In which of the following pairs, there is greatest difference in the oxidation number of the underlined elements?
A.	\[\underline{N}{{O}_{2}}\] and \[{{\underline{N}}_{2}}{{O}_{4}}\]
B.	\[{{\underline{P}}_{2}}{{O}_{5}}\] and \[{{\underline{P}}_{4}}{{O}_{10}}\]
C.	\[{{\underline{N}}_{2}}O\] and \[\underline{N}O\]
D.	\[\underline{S}\,{{O}_{2}}\] and \[\underline{S}\,{{O}_{3}}\]
Answer» E.

Discussion

525.	Hydrolysis constant for a salt of weak acid and weak base would be [RPMT 1999]
A.	\[{{K}_{h}}=\frac{{{K}_{w}}}{{{K}_{a}}}\]
B.	\[{{K}_{h}}=\frac{{{K}_{w}}}{{{K}_{b}}}\]
C.	\[{{K}_{h}}=\frac{{{K}_{w}}}{{{K}_{a}}{{K}_{b}}}\]
D.	None of these
Answer» D. None of these

Discussion

526.	Which of the following is used in fire extinguishers [AFMC 1993]
A.	\[C{{H}_{4}}\]
B.	\[CHC{{l}_{3}}\]
C.	\[C{{H}_{2}}C{{l}_{2}}\]
D.	\[CC{{l}_{4}}\]
Answer» E.

Discussion

527.	Isomerism due to rotation round single bond of carbon-carbon is [UPSEAT 2003]
A.	Conformation
B.	Enantiomerism
C.	Diasterio isomerism
D.	Position isomerism
Answer» B. Enantiomerism

Discussion

528.	\[{{\psi }^{2}}=0\] represent
A.	node
B.	orbital
C.	zero amplitude of wave
D.	wave function
Answer» B. orbital

Discussion

529.	Correct set of four quantum numbers for the outermost electron of rubidium (Z = 37) is -
A.	5, 0, 0, 1/2
B.	5, 1, 0, 1/2
C.	5, 1, 1, 1/2
D.	6, 0, 0, 1/2
Answer» B. 5, 1, 0, 1/2

Discussion

530.	Which of the following statements is true about \[\left[ Cu\,{{\left( N{{H}_{3}} \right)}_{4}} \right]S{{O}_{4}}\] [CPMT 1988]
A.	It has coordinate and covalent bonds
B.	It has only coordinate bonds
C.	It has only electrovalent bonds
D.	It has electrovalent, covalent and coordinate bonds
Answer» E.

Discussion

531.	\[{{H}_{2}}S\] gas when passed through a solution of a contains HCl precipitate the cations of group of qualitative analysis but not those belonging to the fourth group. It is because [CBSE PMT 2005]
A.	Presence of HCl decreases the sulphide ion concentration
B.	Presence of HCl increases the sulphide ion concentration
C.	Solubility product of group II sulphides is more than that of group IV sulphides
D.	Sulphides of group IV Cations are in \[HCl\]
Answer» B. Presence of HCl increases the sulphide ion concentration

Discussion

532.	A group 14 element is oxidised to form corresponding oxide which is gaseous in nature, when dissolved in water pH of the water decreases further addition of group 2 hydroxides leads to precipitation. This oxide can be
A.	\[Ge{{O}_{2}}\]
B.	CO
C.	\[C{{O}_{2}}\]
D.	\[Sn{{O}_{2}}\]
Answer» D. \[Sn{{O}_{2}}\]

Discussion

533.	The compound \[{{C}_{4}}{{H}_{10}}O\] can show [IIT-JEE 1981; MP PET 2000]
A.	Metamerism
B.	Functional isomerism
C.	Positional isomerism
D.	All types
Answer» E.

Discussion

534.	Which is not found in alkenes [AIIMS 1982; RPMT 1999]
A.	Chain isomerism
B.	Geometrical isomerism
C.	Metamerism
D.	Position isomerism
Answer» D. Position isomerism

Discussion

535.	How many isomers of \[{{C}_{5}}{{H}_{11}}OH\] will be primary alcohols [CBSE PMT 1992]
A.	2
B.	3
C.	4
D.	5
Answer» D. 5

Discussion

536.	Nitrate is confirmed by ring test. The brown colour of the ring is due to the formation of [EAMCET 1979; AFMC 1981, 88, 90; RPET 1999; MP PMT 2000; MP PET 2002; CPMT 2004]
A.	Ferrous nitrite
B.	\[FeS{{O}_{4}}NO\]
C.	\[FeS{{O}_{4}}N{{O}_{2}}\]
D.	Ferrous nitrate
Answer» C. \[FeS{{O}_{4}}N{{O}_{2}}\]

Discussion

537.	A deep brown gas is formed by mixing two colourless gases which are
A.	\[N{{O}_{2}}\] and \[{{O}_{2}}\]
B.	\[{{N}_{2}}O\] and NO
C.	NO and \[{{O}_{2}}\]
D.	\[N{{H}_{3}}\] and \[HCl\]
Answer» D. \[N{{H}_{3}}\] and \[HCl\]

Discussion

538.	Which of the following pair of ions makes the water hard [AMU 2002]
A.	\[N{{a}^{+}},\ SO_{4}^{2-}\]
B.	\[{{K}^{+}},\ HCO_{3}^{-}\]
C.	\[C{{a}^{2+}},\ NO_{3}^{-}\]
D.	\[NH_{4}^{+},\ C{{l}^{-}}\]
Answer» C. \[C{{a}^{2+}},\ NO_{3}^{-}\]

Discussion

539.	Size of colloidal particle is [BCECE 2005]
A.	1 nm
B.	1 ? 100 nm
C.	> 100 nm
D.	> 1000 nm
Answer» C. > 100 nm

Discussion

540.	Thalium shows different oxidation states because [AIIMS 1982]
A.	It is a transition element
B.	Of inert pair effect
C.	Of its amphoteric character
D.	Of its higher reactivity
Answer» C. Of its amphoteric character

Discussion

541.	A gaseous compound is composed of 85.7% by mass of carbon and 14.3% by mass of hydrogen. Its density is 22.8 g/L at 350 K and 1.0 atm pressure. Calculate the molecular formula of compound.
A.	\[{{C}_{5}}{{H}_{10}}\]
B.	\[{{C}_{6}}{{H}_{12}}\]
C.	\[{{C}_{4}}{{H}_{8}}\]
D.	\[{{C}_{8}}{{H}_{18}}\]
Answer» D. \[{{C}_{8}}{{H}_{18}}\]

Discussion

542.	If 3 moles of \[{{H}_{2}}\] and 1 mole of \[{{N}_{2}}\] are completely converted into \[N{{H}_{3}},\] the ratio of initial and final volume at the same temp. and pressure will be:
A.	1
B.	3
C.	2
D.	4.2
Answer» D. 4.2

Discussion

543.	1 mol of a gaseous aliphahatic compound\[{{C}_{n}}{{H}_{3n}}{{O}_{m}}\] is completely burnt in an excess of oxygen. The contraction in volume is (assume water get condensed out)
A.	\[\left( 1+\frac{1}{2}n-\frac{3}{4}m \right)\]
B.	\[\left( 1+\frac{3}{4}n-\frac{1}{4}m \right)\]
C.	\[\left( 1-\frac{1}{2}n-\frac{3}{4}m \right)\]
D.	\[\left( 1+\frac{3}{4}n-\frac{1}{2}m \right)\]
Answer» E.

Discussion

544.	The order in which the following oxides are arranged according to decreasing basic nature is [CPMT 1985]
A.	\[N{{a}_{2}}O,\,MgO,\,A{{l}_{2}}{{O}_{3}},\,CuO\]
B.	\[MgO,\,A{{l}_{2}}{{O}_{3}},\,CuO,\,N{{a}_{2}}O\]
C.	\[A{{l}_{2}}{{O}_{3}},\,MgO,\,CuO,\,N{{a}_{2}}O\]
D.	\[CuO,\,N{{a}_{2}}O,\,MgO,\,A{{l}_{2}}{{O}_{3}}\]
Answer» B. \[MgO,\,A{{l}_{2}}{{O}_{3}},\,CuO,\,N{{a}_{2}}O\]

Discussion

545.	Cosin used to detect end point of precipitation titration by adsorption is called [KCET (Med). 2000]
A.	Absorption indicator
B.	Adsorption indicator
C.	Chemical indicator
D.	Normal indicator
Answer» C. Chemical indicator

Discussion

546.	Which of the following are isoelectronic and isostructural \[NO_{3}^{-},\,CO_{3}^{2-},\,ClO_{3}^{-},\,S{{O}_{3}}\] [IIT Screening 2003]
A.	\[NO_{3}^{-},\,CO_{3}^{2-}\]
B.	\[S{{O}_{3}},\,NO_{3}^{-}\]
C.	\[ClO_{3}^{-},\,CO_{3}^{2-}\]
D.	\[CO_{3}^{2-},\,S{{O}_{3}}\]
Answer» B. \[S{{O}_{3}},\,NO_{3}^{-}\]

Discussion

547.	\[Xe{{F}_{2}}\] molecule is [BHU 1982]
A.	Linear
B.	Triangular planar
C.	Pyramidal
D.	Square planar
Answer» B. Triangular planar

Discussion

548.	Which of the following is the correct reducing order of bond-angle [BHU 2000]
A.	\[N{{H}_{3}}<C{{H}_{4}}<{{C}_{2}}{{H}_{2}}<{{H}_{2}}O\]
B.	\[{{C}_{2}}{{H}_{2}}>N{{H}_{3}}>{{H}_{2}}O<C{{H}_{4}}\]
C.	\[N{{H}_{3}}>{{H}_{2}}O>C{{H}_{4}}<{{C}_{2}}{{H}_{2}}\]
D.	\[{{H}_{2}}O<N{{H}_{3}}>C{{H}_{4}}<{{C}_{2}}{{H}_{2}}\]
Answer» C. \[N{{H}_{3}}>{{H}_{2}}O>C{{H}_{4}}<{{C}_{2}}{{H}_{2}}\]

Discussion

549.	The end product of \[(4n+1)\] radioactive disintegration series is [MP PMT 1999]
A.	\[_{83}B{{i}^{209}}\]
B.	\[_{84}P{{o}^{210}}\]
C.	\[_{82}P{{b}^{208}}\]
D.	\[_{82}P{{b}^{207}}\]
Answer» B. \[_{84}P{{o}^{210}}\]

Discussion

550.	Blue litmus turns red in which of the following mixture of acid and base?
A.	\[100\,mL\] of \[1\times {{10}^{-2}}M\,{{H}_{2}}S{{O}_{4}}\]\[+\,100\,mL\] of \[1\times {{10}^{-2}}M\,Ca{{\left( OH \right)}_{2}}\]
B.	\[100\,mL\] of \[1\times {{10}^{-2}}M\,HCl\]+ \[100\,mL\] of \[1\times {{10}^{-2}}M\,Ba{{\left( OH \right)}_{2}}\]
C.	\[100\,mL\] of \[1\times {{10}^{-2}}M\,{{H}_{2}}S{{O}_{4}}\]\[+\,10\,mL\] of \[1\times {{10}^{-2}}M\,NaOH\]
D.	\[100\,mL\] of \[1\times {{10}^{-2}}M\,HCl\]\[+\,100\,mL\] of \[1\times {{10}^{-2}}M\,NaOH\]
Answer» D. \[100\,mL\] of \[1\times {{10}^{-2}}M\,HCl\]\[+\,100\,mL\] of \[1\times {{10}^{-2}}M\,NaOH\]

Discussion

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

The first artificial disintegration of an atomic nucleus was achieved by [Kerala (Engg.) 2002]

Which one is a mixed salt [DPMT 1985]

The molecule that will have minimum dipole moment is

Which of the following molecule is not having perfect geometrical shape.

1, 2-Dichloroethene shows [RPET 1999]

The reagents \[N{{H}_{4}}Cl\] and aqueous \[N{{H}_{3}}\] will precipitate [IIT 1991]

The atomic weight of an element is double its atomic number. If there are four electrons in \[2p\] orbital, the element is [AMU 1983]

Pure water can be obtained from sea water by [CBSE PMT 2001]

If m and e are the mass and charge of the revolving electron in the orbit of radius r for hydrogen atom, the total energy of the revolving electron will be:

\[A{{l}_{2}}{{O}_{3}}\] can be converted to anhydrous \[AlC{{l}_{3}}\] by heating

Which of the following has correct increasing basic strength?

The bond angle in \[P{{H}_{3}}\]would be expected to be close to

Which of the following molecule contains asymmetric carbon atom [JIPMER 2002]

A similarity between optical and geometrical isomerism is that [AIEEE 2002]

If the light waves pass through a nicol prism then all the oscillations occur only in one plane, such beam of light is called as [Kerala (Med.) 2002]

The disintegration constant of radium with half-life 1600 years is [MHCET 2004]

In hydrolysis of a salt of weak acid and strong base, \[{{A}^{-}}+{{H}_{2}}O\] ⇄ \[HA+O{{H}^{-}},\] the hydrolysis constant \[({{K}_{h}})\] is equal to.? [Orissa JEE 2002]

Phenol is used in the manufacture of [AIIMS 1996]

When electric current is supplied through an ionic hydride of fused state, then [Kerala CET 2005]

The energy of an electron in first Bohr orbit of Pi- atom is \[-13.6\text{ }eV\]. The energy value of electron in the excited state of \[L{{i}^{2+}}\] is:

If the amount of radioactive substance is increased three times, the number of atoms disintegrated per unit time would [MP PMT 1994]

The equivalent weight of an element is 4. Its chloride has a V.D 59.25. Then the valency of the element is [BHU 1997]

The isoelectronic pair is [AIIMS 2005]

In which of the following pairs, there is greatest difference in the oxidation number of the underlined elements?

Hydrolysis constant for a salt of weak acid and weak base would be [RPMT 1999]

Which of the following is used in fire extinguishers [AFMC 1993]

Isomerism due to rotation round single bond of carbon-carbon is [UPSEAT 2003]

\[{{\psi }^{2}}=0\] represent

Correct set of four quantum numbers for the outermost electron of rubidium (Z = 37) is -

Which of the following statements is true about \[\left[ Cu\,{{\left( N{{H}_{3}} \right)}_{4}} \right]S{{O}_{4}}\] [CPMT 1988]

\[{{H}_{2}}S\] gas when passed through a solution of a contains HCl precipitate the cations of group of qualitative analysis but not those belonging to the fourth group. It is because [CBSE PMT 2005]

A group 14 element is oxidised to form corresponding oxide which is gaseous in nature, when dissolved in water pH of the water decreases further addition of group 2 hydroxides leads to precipitation. This oxide can be

The compound \[{{C}_{4}}{{H}_{10}}O\] can show [IIT-JEE 1981; MP PET 2000]

Which is not found in alkenes [AIIMS 1982; RPMT 1999]

How many isomers of \[{{C}_{5}}{{H}_{11}}OH\] will be primary alcohols [CBSE PMT 1992]

Nitrate is confirmed by ring test. The brown colour of the ring is due to the formation of [EAMCET 1979; AFMC 1981, 88, 90; RPET 1999; MP PMT 2000; MP PET 2002; CPMT 2004]

A deep brown gas is formed by mixing two colourless gases which are

Which of the following pair of ions makes the water hard [AMU 2002]

Size of colloidal particle is [BCECE 2005]

Thalium shows different oxidation states because [AIIMS 1982]

A gaseous compound is composed of 85.7% by mass of carbon and 14.3% by mass of hydrogen. Its density is 22.8 g/L at 350 K and 1.0 atm pressure. Calculate the molecular formula of compound.

If 3 moles of \[{{H}_{2}}\] and 1 mole of \[{{N}_{2}}\] are completely converted into \[N{{H}_{3}},\] the ratio of initial and final volume at the same temp. and pressure will be:

1 mol of a gaseous aliphahatic compound\[{{C}_{n}}{{H}_{3n}}{{O}_{m}}\] is completely burnt in an excess of oxygen. The contraction in volume is (assume water get condensed out)

The order in which the following oxides are arranged according to decreasing basic nature is [CPMT 1985]

Cosin used to detect end point of precipitation titration by adsorption is called [KCET (Med). 2000]

Which of the following are isoelectronic and isostructural \[NO_{3}^{-},\,CO_{3}^{2-},\,ClO_{3}^{-},\,S{{O}_{3}}\] [IIT Screening 2003]

\[Xe{{F}_{2}}\] molecule is [BHU 1982]

Which of the following is the correct reducing order of bond-angle [BHU 2000]

The end product of \[(4n+1)\] radioactive disintegration series is [MP PMT 1999]

Blue litmus turns red in which of the following mixture of acid and base?