WBJEE Chemistry Test - 15

Question 1

HCN behaves as a very weak acid in aqueous medium whereas it acts as a strong acid in liquid ammonia because :

Accepted Answer

Proton affinity of water is less than that of ammonia

Answer

Electronegativity of oxygen is greater than that of nitrogen

Answer

Ionization energy of oxygen is less than that of nitrogen

Answer

Dipole moment of water is greater than that of ammonia

Question 2

Phenols are more acidic than alcohols because

Accepted Answer

phenoxide ion is stabilised by resonance

Answer

phenols are more soluble in polar solvents

Answer

phenoxide ions do not exhibit resonance

Answer

Alcohols do not lose H atoms at all.

Question 3

Treatment of furfural with NaOH yields

Accepted Answer

Furfuryl alcohol and sodium salt of furan-2-carboxylic acid

Answer

<h5>                                  Furoin                               </h5>

Answer

Furoic acid

Answer

No reaction

Question 4

A light greenish coloured salt was soluble in water. On passing H₂S into the solution, a black ppt. was obtained which dissolved readily in HCl. The metal ion present is

Accepted Answer

Answer

Answer

Answer

Question 5

The energy of an orbit in a hydrogen atom is given by the relation
E = -(Constant/n²) kJ mol^-1.
Which of the following properties represents the constant in the above relation?

Accepted Answer

Ionization energy

Answer

Electron affinity

Answer

Electronegativity

Answer

Bond energy

Question 6

Which of the following is not present in RNA?

Accepted Answer

<h5>Thymine</h5>

Answer

<h5>Uracil</h5>

Answer

<h5>Ribose</h5>

Answer

<h5>Phosphate</h5>

Question 7

When AgNO₃ is strongly heated, the products formed are

Accepted Answer

NO₂ and O₂

Answer

NO and NO₂

Answer

NO₂ and N₂O

Question 8

A

σ

- bond is

Accepted Answer

stronger than $π$ -bond

Answer

weaker than $π$ -bond

Answer

the same as $π$ -bond

Answer

either A or B

Question 9

The state of hybridisation of boron and oxygen atoms in boric acid molecule (H₃BO₃) are respectively

Accepted Answer

Answer

Answer

Answer

Question 10

If bond enthalpies of H-H,Br-Br and H-Br bonds are 433 ,192 and 364 KJ mol^-1respectively ,The ∆H^ofor the reaction H₂(g) + Br₂(g) →2HBr(g) is

Accepted Answer

Answer

Answer

Answer

Question 11

The equilibrium constant in a reversible chemical reaction at a given temperature

Accepted Answer

does not depends on the initial concentrations of reactants

Answer

depends on the inital concentration of the reactants

Answer

depends on the concentration of the products at equilibrium

Answer

is not characteristic of the reactions

Question 12

A reaction involving two different reactants can never be

Accepted Answer

Unimolecular reaction

Answer

Bimolecular reaction

Answer

Second order reaction

Answer

First order reaction

Question 13

For a system in equilibrium, ∆G=0, under conditions of constant

Accepted Answer

temperature and pressure

Answer

temperature and volume

Answer

pressure and volume

Answer

energy and volume

Question 14

Vanishing creams differ from other creams due to the presence of

Accepted Answer

<h5>glycerine</h5>

Answer

<h5>olive oil</h5>

Answer

<h5>almond oil</h5>

Answer

mineral oil

Question 15

The number and type of bonds between two carbon atoms in calcium carbide are

Accepted Answer

One sigma,two pi

Answer

Two sigma, two pi

Answer

two sigma, one pi

Answer

One sigma,one pi

Question 16

The paramagnetic cation is

Accepted Answer

Answer

Answer

Answer

Question 17

The right order of the solubility of sulphates of alkaline earth metals in water is

Accepted Answer

Be>Mg>Ca>Sr>Ba

Answer

Be>Ca>Mg>Ba>Sr

Answer

Mg>Be>Ba>Ca>Sr

Answer

Mg>Ca>Ba>Be>Sr

Question 18

3.2 g of oxygen (At wt. = 16) and 0.2 g of hydrogen (At. wt. = 1) are placed in a 1.12 litre flask at 0^oC. The total pressure of the gas mixture will be

Accepted Answer

Answer

Answer

Answer

Question 19

Which metal is protected by a layer of its own oxide?

Accepted Answer

Answer

Answer

Answer

Question 20

Optical glass contains a high precentage of

Accepted Answer

Answer

Answer

Answer

Question 21

Orthophosphoric acid is

Accepted Answer

<h5>Tribasic</h5>

Answer

<h5>Monobasic</h5>

Answer

<h5>Dibasic</h5>

Answer

<h5>Tetrabasic</h5>

Question 22

Hydrogen from HCl can be prepared by

Accepted Answer

Answer

Answer

Answer

Question 23

Which of the following compound is optically inactive?

Accepted Answer

CH₃.CO.COOH

Answer

CH₃CH(Br)(Cl)

Answer

(CH(OH)COOH)₂

Answer

CH₃CH(OH)COOH

Question 24

When a slow neutron goes sufficently close to a U-235 nucleus, then the process which takes place is called

Accepted Answer

fission of U-235

Answer

fusion of U-235

Answer

fusion of neutron

Answer

first '1' and '2'

Question 25

A Beckmann rearrangement is affected by

Accepted Answer

Sulphuric acid

Answer

Polyphosphoric acid

Answer

Answer

All the above

Question 26

Synthetic polymer which resemble natural rubber is

Accepted Answer

<h5>Neoprene</h5>

Answer

Chloroprene

Answer

<h5>Glyptal</h5>

Answer

<h5>Nylone</h5>

Question 27

Copolymer is

Accepted Answer

<h5>bakelite</h5>

Answer

<h5>nylon 6</h5>

Answer

<h5>teflon</h5>

Answer

<h5>polyethene</h5>

Question 28

A, B, C are three element forming a part of compound in oxidation states of +2, +5 and -2 respectively. What could be the compound?

Accepted Answer

A₃(BC₄)₂

Answer

A₂(BC)₂

Answer

A₂(BC₄)₃

Answer

Question 29

The interionic distance for cesium chloride cystal will be

Accepted Answer

Answer

Answer

Answer

Question 30

Consider the following statements about dimethyl cyclohexanes :
1. trans-1,2-dimethylcyclohexane is more stable than the corresponding cis-isomer
2. cis-1,3-dimethylcyclohexane is an optically inactive meso form
3. trans-1,3-dimethylcyclohexane is more stable than the corresponding cis-isomer
4. cis-1,2-dimethylcyclohexane is an unresolvable racemic mixture
Which of the statements given above are correct ?

Accepted Answer

Answer

Answer

Answer

WBJEE Sample Papers, Section Wise & Full Chemistry Test - 15 Free Online

MCQ Practice Test & Solutions: WBJEE Chemistry Test - 15 (40 Questions)

HCN behaves as a very weak acid in aqueous medium whereas it acts as a strong acid in liquid ammonia because :

Phenols are more acidic than alcohols because

Treatment of furfural with NaOH yields

A light greenish coloured salt was soluble in water. On passing H₂S into the solution, a black ppt. was obtained which dissolved readily in HCl. The metal ion present is

The energy of an orbit in a hydrogen atom is given by the relation
E = -(Constant/n²) kJ mol^-1.
Which of the following properties represents the constant in the above relation?

Which of the following is not present in RNA?

When AgNO₃ is strongly heated, the products formed are

A $σ$ - bond is

The state of hybridisation of boron and oxygen atoms in boric acid molecule (H₃BO₃) are respectively

If bond enthalpies of H-H,Br-Br and H-Br bonds are 433 ,192 and 364 KJ mol^-1respectively ,The ∆H^ofor the reaction H₂(g) + Br₂(g) →2HBr(g) is

The equilibrium constant in a reversible chemical reaction at a given temperature

A reaction involving two different reactants can never be

For a system in equilibrium, ∆G=0, under conditions of constant

Vanishing creams differ from other creams due to the presence of

The number and type of bonds between two carbon atoms in calcium carbide are

The paramagnetic cation is

The right order of the solubility of sulphates of alkaline earth metals in water is

3.2 g of oxygen (At wt. = 16) and 0.2 g of hydrogen (At. wt. = 1) are placed in a 1.12 litre flask at 0^oC. The total pressure of the gas mixture will be

Which metal is protected by a layer of its own oxide?

Optical glass contains a high precentage of

Orthophosphoric acid is

Hydrogen from HCl can be prepared by

Which of the following compound is optically inactive?

When a slow neutron goes sufficently close to a U-235 nucleus, then the process which takes place is called

A Beckmann rearrangement is affected by

Synthetic polymer which resemble natural rubber is

Copolymer is

A, B, C are three element forming a part of compound in oxidation states of +2, +5 and -2 respectively. What could be the compound?

The interionic distance for cesium chloride cystal will be

WBJEE Sample Papers, Section Wise & Full Mock Tests 2026

WBJEE Sample Papers, Section Wise & Full Mock Tests 2026

Top Courses for JEE

About this JEE Practice Test

Explore more JEE Study Resources

WBJEE Sample Papers, Section Wise & Full Chemistry Test - 15 Free Online

MCQ Practice Test & Solutions: WBJEE Chemistry Test - 15 (40 Questions)

HCN behaves as a very weak acid in aqueous medium whereas it acts as a strong acid in liquid ammonia because :

Phenols are more acidic than alcohols because

Treatment of furfural with NaOH yields

A light greenish coloured salt was soluble in water. On passing H₂S into the solution, a black ppt. was obtained which dissolved readily in HCl. The metal ion present is

The energy of an orbit in a hydrogen atom is given by the relation E = -(Constant/n2) kJ mol-1. Which of the following properties represents the constant in the above relation?

Which of the following is not present in RNA?

When AgNO₃ is strongly heated, the products formed are

A σ- bond is

The state of hybridisation of boron and oxygen atoms in boric acid molecule (H₃BO₃) are respectively

If bond enthalpies of H-H,Br-Br and H-Br bonds are 433 ,192 and 364 KJ mol-1 respectively ,The ∆Ho for the reaction H₂(g) + Br₂(g) →2HBr(g) is

The equilibrium constant in a reversible chemical reaction at a given temperature

A reaction involving two different reactants can never be

For a system in equilibrium, ∆G=0, under conditions of constant

Vanishing creams differ from other creams due to the presence of

The number and type of bonds between two carbon atoms in calcium carbide are

The paramagnetic cation is

The right order of the solubility of sulphates of alkaline earth metals in water is

3.2 g of oxygen (At wt. = 16) and 0.2 g of hydrogen (At. wt. = 1) are placed in a 1.12 litre flask at 0oC. The total pressure of the gas mixture will be

Which metal is protected by a layer of its own oxide?

Optical glass contains a high precentage of

Orthophosphoric acid is

Hydrogen from HCl can be prepared by

Which of the following compound is optically inactive?

When a slow neutron goes sufficently close to a U-235 nucleus, then the process which takes place is called

A Beckmann rearrangement is affected by

Synthetic polymer which resemble natural rubber is

Copolymer is

A, B, C are three element forming a part of compound in oxidation states of +2, +5 and -2 respectively. What could be the compound?

The interionic distance for cesium chloride cystal will be

WBJEE Sample Papers, Section Wise & Full Mock Tests 2026

WBJEE Sample Papers, Section Wise & Full Mock Tests 2026

Top Courses for JEE

About this JEE Practice Test

Explore more JEE Study Resources

The energy of an orbit in a hydrogen atom is given by the relation
E = -(Constant/n²) kJ mol^-1.
Which of the following properties represents the constant in the above relation?

A $σ$ - bond is

If bond enthalpies of H-H,Br-Br and H-Br bonds are 433 ,192 and 364 KJ mol^-1respectively ,The ∆H^ofor the reaction H₂(g) + Br₂(g) →2HBr(g) is

3.2 g of oxygen (At wt. = 16) and 0.2 g of hydrogen (At. wt. = 1) are placed in a 1.12 litre flask at 0^oC. The total pressure of the gas mixture will be