11242 + Mcqs in Chemistry Page 54 McqOptions

2651.	Which of the following have both polar and non-polar bonds [AIIMS 1997]
A.	\[{{C}_{2}}{{H}_{6}}\]
B.	\[N{{H}_{4}}Cl\]
C.	\[HCl\]
D.	\[AlC{{l}_{3}}\]
Answer» C. \[HCl\]

Discussion

2652.	The polar molecule among the following is [Orissa JEE 1997]
A.	\[CC{{l}_{4}}\]
B.	\[C{{O}_{2}}\]
C.	\[C{{H}_{2}}C{{l}_{2}}\]
D.	\[C{{H}_{2}}=C{{H}_{2}}\]
Answer» D. \[C{{H}_{2}}=C{{H}_{2}}\]

Discussion

2653.	\[B{{F}_{3}}\] and \[N{{F}_{3}}\]both molecules are covalent, but \[B{{F}_{3}}\] is non-polar and \[N{{F}_{3}}\] is polar. Its reason is [CPMT 1989; NCERT 1980]
A.	In uncombined state boron is metal and nitrogen is gas
B.	\[B-F\]bond has no dipole moment whereas \[N-F\] bond has dipole moment
C.	The size of boron atom is smaller than nitrogen
D.	\[B{{F}_{3}}\] is planar whereas \[N{{F}_{3}}\] is pyramidal
Answer» E.

Discussion

2654.	If ?I? is the intensity of absorbed light and C is the concentration of AB for the photochemical process \[AB+hv\to AB,\] the rate of formation of AB is directly proportional to [IIT Screening 2001]
A.	C
B.	I
C.	\[{{I}^{2}}\]
D.	C.I
Answer» C. \[{{I}^{2}}\]

Discussion

2655.	The photolysis of water gives the substance
A.	\[O{{H}^{-}}+{{H}^{+}}\]
B.	\[{{H}_{2}}+O{{H}^{-}}\]
C.	\[{{H}_{2}}+{{O}_{2}}\]
D.	\[{{H}_{2}}O+{{H}_{2}}{{O}_{2}}\]
Answer» B. \[{{H}_{2}}+O{{H}^{-}}\]

Discussion

2656.	The law of photochemical equivalence was given by
A.	Drapper
B.	Grauths
C.	Einstein
D.	Labbert
Answer» D. Labbert

Discussion

2657.	The formation of starch in plants results from
A.	Photosynthesis
B.	Photolysis
C.	Flash photolysis
D.	None of the above
Answer» B. Photolysis

Discussion

2658.	The empirical formula of an acid is \[C{{H}_{2}}{{O}_{2}}\], the probable molecular formula of acid may be [AFMC 2000]
A.	\[C{{H}_{2}}O\]
B.	\[C{{H}_{2}}{{O}_{2}}\]
C.	\[{{C}_{2}}{{H}_{4}}{{O}_{2}}\]
D.	\[{{C}_{3}}{{H}_{6}}{{O}_{4}}\]
Answer» C. \[{{C}_{2}}{{H}_{4}}{{O}_{2}}\]

Discussion

2659.	The empirical formula of a compound is \[C{{H}_{2}}O.\] 0.0835 moles of the compound contains 1.0 g of hydrogen. Molecular formula of the compound is
A.	\[{{C}_{2}}{{H}_{12}}{{O}_{6}}\]
B.	\[{{C}_{5}}{{H}_{10}}{{O}_{5}}\]
C.	\[{{C}_{4}}{{H}_{8}}{{O}_{8}}\]
D.	\[{{C}_{3}}{{H}_{6}}{{O}_{3}}\]
Answer» B. \[{{C}_{5}}{{H}_{10}}{{O}_{5}}\]

Discussion

2660.	A compound (80 g) on analysis gave C = 24 g, H = 4 g, O = 32 g. Its empirical formula is [CPMT 1981]
A.	\[{{C}_{2}}{{H}_{2}}{{O}_{2}}\]
B.	\[{{C}_{2}}{{H}_{2}}O\]
C.	\[C{{H}_{2}}{{O}_{2}}\]
D.	\[C{{H}_{2}}O\]
Answer» E.

Discussion

2661.	If two compounds have the same empirical formula but different molecular formula, they must have [MP PMT 1986]
A.	Different percentage composition
B.	Different molecular weights
C.	Same viscosity
D.	Same vapour density
Answer» C. Same viscosity

Discussion

2662.	The percentage of nitrogen in urea is about [KCET 2001]
A.	46
B.	85
C.	18
D.	28
Answer» B. 85

Discussion

2663.	The percentage of oxygen in \[NaOH\] is [CPMT 1979]
A.	40
B.	60
C.	8
D.	10
Answer» B. 60

Discussion

2664.	The most efficient agent for the absorption of \[S{{O}_{3}}\] is [BHU 2004; DPMT 2004]
A.	\[80%\ {{H}_{2}}S{{O}_{4}}\]
B.	\[98%\ {{H}_{2}}S{{O}_{4}}\]
C.	\[50%\ {{H}_{2}}S{{O}_{4}}\]
D.	\[20%\ {{H}_{2}}{{S}_{2}}{{O}_{7}}\]
Answer» C. \[50%\ {{H}_{2}}S{{O}_{4}}\]

Discussion

2665.	Sulphur on boiling with \[NaOH\] solution gives [Roorkee 1999]
A.	\[N{{a}_{2}}{{S}_{2}}{{O}_{3}}+NaHS{{O}_{3}}\]
B.	\[N{{a}_{2}}{{S}_{2}}{{O}_{3}}+N{{a}_{2}}S\]
C.	\[N{{a}_{2}}S{{O}_{3}}\]\[+{{H}_{2}}S\]
D.	\[N{{a}_{2}}S{{O}_{3}}+S{{O}_{2}}\]
Answer» C. \[N{{a}_{2}}S{{O}_{3}}\]\[+{{H}_{2}}S\]

Discussion

2666.	Which of the following is formed by the action of water on sodium peroxide [Pb. PMT 1999]
A.	\[{{H}_{2}}\]
B.	\[{{N}_{2}}\]
C.	\[{{O}_{2}}\]
D.	\[C{{O}_{2}}\]
Answer» D. \[C{{O}_{2}}\]

Discussion

2667.	In presence of moisture, \[S{{O}_{2}}\] can [BVP 2003]
A.	Act as oxidant
B.	Lose electron
C.	Gain electron
D.	Not act as reductant
Answer» C. Gain electron

Discussion

2668.	A gas that cannot be collected over water is [Kurukshetra CEE 1998]
A.	\[{{N}_{2}}\]
B.	\[{{O}_{2}}\]
C.	\[S{{O}_{2}}\]
D.	\[P{{H}_{3}}\]
Answer» D. \[P{{H}_{3}}\]

Discussion

2669.	\[{{H}_{2}}S{{O}_{4}}\] acts as dehydrating agent in its reaction with [JIPMER 2001]
A.	\[{{H}_{2}}{{C}_{2}}{{O}_{4}}\]
B.	\[Ba{{(OH)}_{2}}\]
C.	\[KOH\]
D.	\[Zn\]
Answer» B. \[Ba{{(OH)}_{2}}\]

Discussion

2670.	\[K{{O}_{2}}+C{{O}_{2}}\to ?\] (gas) [CPMT 1997]
A.	\[{{H}_{2}}\]
B.	\[{{N}_{2}}\]
C.	\[{{O}_{2}}\]
D.	\[CO\]
Answer» D. \[CO\]

Discussion

2671.	In the manufacture of sulphuric acid by contact process, Tyndall box is used to [KCET 2003]
A.	Filter dust particles
B.	Remove impurities
C.	Convert \[S{{O}_{2}}\] to \[S{{O}_{3}}\]
D.	Test the presence of dust particles
Answer» E.

Discussion

2672.	Which of the following is a suboxide [DPMT 2001]
A.	\[B{{a}_{2}}O\]
B.	\[CaC{{O}_{3}}\]
C.	\[{{C}_{3}}{{O}_{2}}\]
D.	\[ZnO\]
Answer» C. \[{{C}_{3}}{{O}_{2}}\]

Discussion

2673.	The number of unpaired electrons in the p-subshell of oxygen atom is [Kurukshetra CEE 1991]
A.	1
B.	2
C.	3
D.	4
Answer» C. 3

Discussion

2674.	Which of the following is not a chalcogen [CPMT 1999]
A.	O
B.	S
C.	Se
D.	Na
Answer» E.

Discussion

2675.	Which of the following bonds has the highest energy [CBSE PMT 1996]
A.	\[Se-Se\]
B.	\[Te-Te\]
C.	\[S-S\]
D.	\[O-O\]
Answer» D. \[O-O\]

Discussion

2676.	When \[{{H}_{2}}S\] gas is passed through nitric acid, the product is [Kerala (Engg.) 2002]
A.	Rhombic S
B.	Prismatic S
C.	Amorphous S
D.	Monoclinic S
E.	None of these
Answer» F.

Discussion

2677.	The triatomic species of elemental oxygen is known as [Kerala (Med.) 2002]
A.	Azone
B.	Polyzone
C.	Triozone
D.	Ozone
Answer» E.

Discussion

2678.	All the elements of oxygen family are [MP PET/PMT 1998]
A.	Non-metals
B.	Metalloids
C.	Radioactive
D.	Polymorphic
Answer» E.

Discussion

2679.	Which shows polymorphism [DCE 2000]
A.	O
B.	S
C.	Se
D.	All
Answer» E.

Discussion

2680.	Which of the following is not suitable for use in a descicator to dry substances [AIIMS 1996]
A.	Conc. \[{{H}_{2}}S{{O}_{4}}\]
B.	\[N{{a}_{2}}S{{O}_{4}}\]
C.	\[CaC{{l}_{2}}\]
D.	\[{{P}_{4}}{{O}_{10}}\]
Answer» B. \[N{{a}_{2}}S{{O}_{4}}\]

Discussion

2681.	Ozone belongs to which group of the periodic table
A.	V group
B.	VI group
C.	VII group
D.	None of these
Answer» E.

Discussion

2682.	The catalyst used in the manufacture of \[{{H}_{2}}S{{O}_{4}}\] by contact process is [UPSEAT 1999]
A.	\[A{{l}_{2}}{{O}_{3}}\]
B.	\[C{{r}_{2}}{{O}_{3}}\]
C.	\[{{V}_{2}}{{O}_{5}}\]
D.	\[Mn{{O}_{2}}\]
Answer» D. \[Mn{{O}_{2}}\]

Discussion

2683.	Which of the following hydrides has the lowest boiling point [MP PET 1997]
A.	\[{{H}_{2}}O\]
B.	\[{{H}_{2}}S\]
C.	\[{{H}_{2}}Se\]
D.	\[{{H}_{2}}Te\]
Answer» C. \[{{H}_{2}}Se\]

Discussion

2684.	In the preparation of sulphuric acid, \[C{{a}^{2+}},\,NO_{3}^{-}\] is used in the reaction, which is [CBSE PMT 2001; AFMC 2001]
A.	\[S+{{O}_{2}}\to S{{O}_{2}}\]
B.	\[2S{{O}_{2}}+{{O}_{2}}\to 2S{{O}_{3}}\]
C.	\[S{{O}_{2}}+{{H}_{2}}O\to {{H}_{2}}S{{O}_{4}}\]
D.	\[{{N}_{2}}+3{{H}_{2}}\to 2N{{H}_{3}}\]
Answer» C. \[S{{O}_{2}}+{{H}_{2}}O\to {{H}_{2}}S{{O}_{4}}\]

Discussion

2685.	Point out in which of the following properties oxygen differs from the rest of the members of its family (Group-VIA) [MP PMT 1997]
A.	High value of ionisation energies
B.	Oxidation states (2, 4, 6)
C.	Polymorphism
D.	Formation of hydrides
Answer» C. Polymorphism

Discussion

2686.	Among \[K{{O}_{2}},\] \[NO_{2}^{-},\] \[Ba{{O}_{2}}\] and \[NO_{2}^{+}\] unpaired electron is present in [IIT 1997]
A.	\[NO_{2}^{+}\] and \[Ba{{O}_{2}}\]
B.	\[K{{O}_{2}}\] and \[Ba{{O}_{2}}\]
C.	\[K{{O}_{2}}\] only
D.	\[Ba{{O}_{2}}\] only
Answer» D. \[Ba{{O}_{2}}\] only

Discussion

2687.	Superphosphate is the mixture of [CPMT 1993]
A.	Calcium phosphate and dil. \[{{H}_{2}}S{{O}_{4}}\]
B.	Sodium phosphate and dil. \[{{H}_{2}}S{{O}_{4}}\]
C.	Potassium phosphate and dil. \[{{H}_{2}}S{{O}_{4}}\]
D.	None of these
Answer» B. Sodium phosphate and dil. \[{{H}_{2}}S{{O}_{4}}\]

Discussion

2688.	Which of the following dissociates to give \[{{H}^{+}}\] most easily [MP PET 1994]
A.	\[{{H}_{2}}O\]
B.	\[{{H}_{2}}S\]
C.	\[{{H}_{2}}Te\]
D.	\[{{H}_{2}}Se\]
Answer» D. \[{{H}_{2}}Se\]

Discussion

2689.	The highest catenation ability is shown by [AIIMS 1983; MP PET 1993; CPMT 1997]
A.	Oxygen
B.	Sulphur
C.	Selenium
D.	Tellurium
Answer» C. Selenium

Discussion

2690.	Among the hydrides formed by the group VI-A elements, only \[{{H}_{2}}O\] has an abnormally low volatility (high boiling point). This is so because
A.	\[{{H}_{2}}O\] molecules are associated due to intermolecular hydrogen bonds
B.	\[{{H}_{2}}O\] is covalent in nature
C.	The \[O-H\] bond in \[{{H}_{2}}O\] is very strong
D.	The electronegativity difference of \[H\] and \[O\] is very large
Answer» B. \[{{H}_{2}}O\] is covalent in nature

Discussion

2691.	Sulphuric acid reacts with \[PC{{l}_{5}}\] to give [KCET 1996; JIPMER 2000]
A.	Thionyl chloride
B.	Sulphur monochloride
C.	Sulphuryl chloride
D.	Sulphur tetrachloride
Answer» D. Sulphur tetrachloride

Discussion

2692.	Carbogen is [EAMCET 1998]
A.	Pure form of carbon
B.	\[COC{{l}_{2}}\]
C.	Mixture of \[CO\] and \[C{{O}_{2}}\]
D.	Mixture of \[{{O}_{2}}\] and \[C{{O}_{2}}\]
Answer» E.

Discussion

2693.	Amongst \[{{H}_{2}}O,\] \[{{H}_{2}}S,\] \[{{H}_{2}}Se\] and \[{{H}_{2}}Te\] the one with the highest boiling point is [IIT-JEE (Screening) 2000]
A.	\[{{H}_{2}}O\] because of hydrogen bonding
B.	\[{{H}_{2}}\]Te because of higher molecular weight
C.	\[{{H}_{2}}S\] because of hydrogen bonding
D.	\[{{H}_{2}}Se\] because of lower molecular weight
Answer» B. \[{{H}_{2}}\]Te because of higher molecular weight

Discussion

2694.	Which of the following products is formed on boiling tin with an alkali solution [Roorkee 2000]
A.	\[Sn{{(OH)}_{2}}\]
B.	\[Sn{{(OH)}_{4}}\]
C.	\[SnO_{3}^{2-}\]
D.	\[Sn{{O}_{2}}\]
Answer» D. \[Sn{{O}_{2}}\]

Discussion

2695.	At room temperature \[{{H}_{2}}O\] is a liquid while \[{{H}_{2}}S\] is a gas. The reason is [RPET 1999]
A.	Electronegativity of O is greater than S
B.	Difference in the bond angles of both the molecules
C.	Association takes place in \[{{H}_{2}}O\] due to H-bonding while no H- bonding in \[{{H}_{2}}S\]
D.	O and S belong to different periods
Answer» D. O and S belong to different periods

Discussion

2696.	Which of the following mixture is chromic acid [Pb. PMT 2000]
A.	\[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] and conc. \[{{H}_{2}}S{{O}_{4}}\]
B.	\[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] and \[HCl\]
C.	\[{{K}_{2}}S{{O}_{4}}\] and conc. \[{{H}_{2}}S{{O}_{4}}\]
D.	\[{{H}_{2}}S{{O}_{4}}\] and \[HCl\]
Answer» B. \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] and \[HCl\]

Discussion

2697.	\[{{H}_{2}}S\] react with \[{{O}_{2}}\] to form [AFMC 1995]
A.	\[{{H}_{2}}O+S\]
B.	\[{{H}_{2}}O+S{{O}_{2}}\]
C.	\[{{H}_{2}}O+S{{O}_{3}}\]
D.	\[{{H}_{2}}S{{O}_{4}}+S\]
Answer» B. \[{{H}_{2}}O+S{{O}_{2}}\]

Discussion

2698.	Which of the following is the best scientific method to test presence of water in a liquid [AIIMS 1999]
A.	Taste
B.	Smell
C.	Use of litmus paper
D.	Use of anhydrous copper sulphate
Answer» E.

Discussion

2699.	Aqueous solutions of hydrogen sulphide and sulphur dioxide when mixed together, yield [KCET 2002]
A.	Sulphur and water
B.	Sulphur trioxide and water
C.	Hydrogen peroxide and sulphur
D.	Hydrogen and sulphurous acid
Answer» B. Sulphur trioxide and water

Discussion

2700.	Hypo is used in photography because of its [IIT 1981; EAMCET 1988; MADT Bihar 1995]
A.	Reducing behaviour
B.	Oxidising behaviour
C.	Complex forming behaviour
D.	Reaction with light
Answer» D. Reaction with light

Discussion

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

Which of the following have both polar and non-polar bonds [AIIMS 1997]

The polar molecule among the following is [Orissa JEE 1997]

\[B{{F}_{3}}\] and \[N{{F}_{3}}\]both molecules are covalent, but \[B{{F}_{3}}\] is non-polar and \[N{{F}_{3}}\] is polar. Its reason is [CPMT 1989; NCERT 1980]

If ?I? is the intensity of absorbed light and C is the concentration of AB for the photochemical process \[AB+hv\to AB*,\] the rate of formation of AB* is directly proportional to [IIT Screening 2001]

The photolysis of water gives the substance

The law of photochemical equivalence was given by

The formation of starch in plants results from

The empirical formula of an acid is \[C{{H}_{2}}{{O}_{2}}\], the probable molecular formula of acid may be [AFMC 2000]

The empirical formula of a compound is \[C{{H}_{2}}O.\] 0.0835 moles of the compound contains 1.0 g of hydrogen. Molecular formula of the compound is

A compound (80 g) on analysis gave C = 24 g, H = 4 g, O = 32 g. Its empirical formula is [CPMT 1981]

If two compounds have the same empirical formula but different molecular formula, they must have [MP PMT 1986]

The percentage of nitrogen in urea is about [KCET 2001]

The percentage of oxygen in \[NaOH\] is [CPMT 1979]

The most efficient agent for the absorption of \[S{{O}_{3}}\] is [BHU 2004; DPMT 2004]

Sulphur on boiling with \[NaOH\] solution gives [Roorkee 1999]

Which of the following is formed by the action of water on sodium peroxide [Pb. PMT 1999]

In presence of moisture, \[S{{O}_{2}}\] can [BVP 2003]

A gas that cannot be collected over water is [Kurukshetra CEE 1998]

\[{{H}_{2}}S{{O}_{4}}\] acts as dehydrating agent in its reaction with [JIPMER 2001]

\[K{{O}_{2}}+C{{O}_{2}}\to ?\] (gas) [CPMT 1997]

In the manufacture of sulphuric acid by contact process, Tyndall box is used to [KCET 2003]

Which of the following is a suboxide [DPMT 2001]

The number of unpaired electrons in the p-subshell of oxygen atom is [Kurukshetra CEE 1991]

Which of the following is not a chalcogen [CPMT 1999]

Which of the following bonds has the highest energy [CBSE PMT 1996]

When \[{{H}_{2}}S\] gas is passed through nitric acid, the product is [Kerala (Engg.) 2002]

The triatomic species of elemental oxygen is known as [Kerala (Med.) 2002]

All the elements of oxygen family are [MP PET/PMT 1998]

Which shows polymorphism [DCE 2000]

Which of the following is not suitable for use in a descicator to dry substances [AIIMS 1996]

Ozone belongs to which group of the periodic table

The catalyst used in the manufacture of \[{{H}_{2}}S{{O}_{4}}\] by contact process is [UPSEAT 1999]

Which of the following hydrides has the lowest boiling point [MP PET 1997]

In the preparation of sulphuric acid, \[C{{a}^{2+}},\,NO_{3}^{-}\] is used in the reaction, which is [CBSE PMT 2001; AFMC 2001]

Point out in which of the following properties oxygen differs from the rest of the members of its family (Group-VIA) [MP PMT 1997]

Among \[K{{O}_{2}},\] \[NO_{2}^{-},\] \[Ba{{O}_{2}}\] and \[NO_{2}^{+}\] unpaired electron is present in [IIT 1997]

Superphosphate is the mixture of [CPMT 1993]

Which of the following dissociates to give \[{{H}^{+}}\] most easily [MP PET 1994]

The highest catenation ability is shown by [AIIMS 1983; MP PET 1993; CPMT 1997]

Among the hydrides formed by the group VI-A elements, only \[{{H}_{2}}O\] has an abnormally low volatility (high boiling point). This is so because

Sulphuric acid reacts with \[PC{{l}_{5}}\] to give [KCET 1996; JIPMER 2000]

Carbogen is [EAMCET 1998]

Amongst \[{{H}_{2}}O,\] \[{{H}_{2}}S,\] \[{{H}_{2}}Se\] and \[{{H}_{2}}Te\] the one with the highest boiling point is [IIT-JEE (Screening) 2000]

Which of the following products is formed on boiling tin with an alkali solution [Roorkee 2000]

At room temperature \[{{H}_{2}}O\] is a liquid while \[{{H}_{2}}S\] is a gas. The reason is [RPET 1999]

Which of the following mixture is chromic acid [Pb. PMT 2000]

\[{{H}_{2}}S\] react with \[{{O}_{2}}\] to form [AFMC 1995]

Which of the following is the best scientific method to test presence of water in a liquid [AIIMS 1999]

Aqueous solutions of hydrogen sulphide and sulphur dioxide when mixed together, yield [KCET 2002]

Hypo is used in photography because of its [IIT 1981; EAMCET 1988; MADT Bihar 1995]

If ?I? is the intensity of absorbed light and C is the concentration of AB for the photochemical process \[AB+hv\to AB,\] the rate of formation of AB is directly proportional to [IIT Screening 2001]