WBJEE Chemistry Test - 6

Question 1

NH₄Cl in liquid NH₃ will act as a/an :

Accepted Answer

Answer

Answer

double salt

Answer

none of these

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

Which of the following does not turn Schiff's reagent to pink ?

Accepted Answer

Methyl chloride

Answer

Formaldehyde

Answer

Benzaldehyde

Answer

<h5>                                  Acetone                               </h5>

Question 4

Fe(OH)₃ can be separated from Al(OH)₃ by the addition of

Accepted Answer

NaOH solution

Answer

Answer

NaCl solution

Answer

NH₄Cl + NHOH

Question 5

Sometimes yellow turbidity appears while passing H₂S gas even in the absence of II group radicals. This is because of

Accepted Answer

The oxidation of H₂S gas by some acid radicals

Answer

Sulphur is present in the mixture as impurity

Answer

IV group radicals are precipitated as sulphides

Answer

III group radicals are precipitated as hydroxides

Question 6

The energy of second Bohr orbit of the hydrogen atom is -328KJ mol⁻¹. The energy of fourth Bohr orbit would be

Accepted Answer

-82 KJ mol⁻¹

Answer

-41 KJ mol⁻¹

Answer

-164 KJ mol⁻¹

Answer

-1312 KJ mol⁻¹

Question 7

On hydrolysis of starch, we finally get

Accepted Answer

<h5>Glucose</h5>

Answer

<h5>Fructose</h5>

Answer

Answer

<h5>Sucrose</h5>

Question 8

Among the molecules (a)XeO₃ (b)XeOF (c)XeOF₆,those having same no. of lone pairs on Xe are

Accepted Answer

Answer

a and b only

Answer

a and c only

Answer

b and c only

Question 9

The heat of formation of CO₂ is -94 Kcal mol⁻¹ whereas ∆H for 2CeO₂ → 2CO is -110.5 Kcal,The enthalpy of combustion carbon is

Accepted Answer

-94 Kcal mol⁻¹

Answer

-110.5 Kcal mol⁻¹

Answer

-55 Kcal mol⁻¹

Answer

-16.5 Kcal mol⁻¹

Question 10

The equilibrium constant for the following reaction will be 3 A + 2 B → C

Accepted Answer

[C] / [A]³ [B]²

Answer

[3A][2B] / [C]

Answer

[C] / [3A][2B]

Answer

[C] / [A]² [B]²

Question 11

The most reactive nucleophile among the following is

Accepted Answer

Answer

C₆H₅O^-

Answer

(CH₃)₂CHO^-

Answer

(CH₃)₃CO^-

Question 12

A reaction with respect to the reactant A has a rate constant of 5 s⁻¹. If we start with[A]= 10 mol-L⁻¹, then in what time the concentration of A becomes 1.0 mol-L⁻¹?

Accepted Answer

Answer

Answer

Answer

Question 13

In an electrochemical cell, if Eº is the EMF of the cell involving 'n' mole of electrons, then ∆Gº is

Accepted Answer

∆Gº = -nFEº

Answer

∆Gº = nFEº

Answer

Eº = nF∆Gº

Answer

∆G = nF/Eº

Question 14

Aspirin is an acetylation product of

Accepted Answer

o-hydroxybenzoic acid

Answer

o-dihydroxybenzene

Answer

m-hydroxybenzoic acid

Answer

p-dihydroxybenzene

Question 15

According to Lewis, the ligands are

Accepted Answer

Basic in nature

Answer

Acidic in nature

Answer

Neither acidic nor basic

Answer

Some are acidic and others are basic

Question 16

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 17

Electromagnetic separation is used in the concentration of

Accepted Answer

Cassiterite

Answer

Copper pyrites

Answer

<h5>Bauxite</h5>

Answer

<h5>Cinnabar</h5>

Question 18

A real gas most closely approaches the behaviour of an ideal gas at

Accepted Answer

0.5 atm and 500 K

Answer

15 atmospheres and 200 K

Answer

1 atm and 273 K

Answer

15 atm and 500 K

Question 19

Thermite is a mixture of iron oxide and

Accepted Answer

aluminium powder

Answer

zinc powder

Answer

sodium shavings

Answer

potassium metal

Question 20

The important ore of lead is

Accepted Answer

<h5>Galena</h5>

Answer

Chalcopyrites

Answer

<h5>Haematite</h5>

Answer

<h5>Bauxite</h5>

Question 21

What are the products obtained when ammonia is treated with excess of chlorine ?

Accepted Answer

NCl₃ and HCl

Answer

N₂ and NCl₃

Answer

N₂ and HCl

Answer

N₂ and NH₄Cl

Question 22

Sodium sulphate is soluble in water but barium sulphate is insoluble because

Accepted Answer

Both A and B

Answer

the hydration energy of Na₂SO₄ is more than its lattice energy

Answer

the lattice energy of BaSO₄ is more than its hydration energy

Answer

the lattice energy has no role to play in solubility

Question 23

The isomers, which possess same structural formula, but differ in spatial arrangement of the group around the double bond, are called

Accepted Answer

geometrical isomers

Answer

chain isomers

Answer

position isomers

Answer

optical isomers

Question 24

The radioisotope, tritium (³H₁) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many miligrams of it would remain after 49.2 years ?

Accepted Answer

Answer

Answer

Answer

Question 25

In the sequence given below Z is

Accepted Answer

Answer

Answer

Answer

Question 26

The compound is used in the manufacture of terylene is

Accepted Answer

ethylene glycol

Answer

<h5>ethylene</h5>

Answer

vinyl chloride

Answer

adipic acid

Question 27

Which of the following is a polyamide molecule?

Accepted Answer

<h5>Nylon-6</h5>

Answer

<h5>Terylene</h5>

Answer

<h5>Rayon</h5>

Answer

Polystyrene

Question 28

In which of the following reaction there is no change in oxidation number

Accepted Answer

Na₂O + H₂SO₄ → Na₂SO₄ + H₂O

Answer

SO₂ + 2H₂S → 2H₂O + 3S

Answer

2Na + O₂ → Na₂O₂

Answer

4KClO₃ → 3KClO₄ + KCl

Question 29

Which of the following statements is correct?

Accepted Answer

Metals are good conductors of electricity

Answer

Silicon doped with Boron is an n - type semiconductor

Answer

Silicon doped with Arsenic is a p - type semiconductor

Answer

Electrical conductivity of semi conductors decreases with increasing temperature

Question 30

Consider the following statements about enantiomers :
1. Isomers which are mirror images of each other are called enantiomers
2. A mixture of equal parts of enantiomers is called a racemic modification
3. Enantiomers show different properties-physical or chemical -only in a chiral medium
4. A racemic modification is converted by an optically active agent into mixture of diasteromers that can be separated.
Which of the above statements are correct ?

Accepted Answer

1,2,3 and 4

Answer

Answer

Answer

WBJEE Sample Papers, Section Wise & Full Chemistry Test - 6 Free Online

MCQ Practice Test & Solutions: WBJEE Chemistry Test - 6 (40 Questions)

NH₄Cl in liquid NH₃ will act as a/an :

Phenols are more acidic than alcohols because

Which of the following does not turn Schiff's reagent to pink ?

Fe(OH)₃ can be separated from Al(OH)₃ by the addition of

Sometimes yellow turbidity appears while passing H₂S gas even in the absence of II group radicals. This is because of

The energy of second Bohr orbit of the hydrogen atom is -328KJ mol⁻¹. The energy of fourth Bohr orbit would be

On hydrolysis of starch, we finally get

Among the molecules (a)XeO₃ (b)XeOF (c)XeOF₆,those having same no. of lone pairs on Xe are

The heat of formation of CO₂ is -94 Kcal mol⁻¹ whereas ∆H for 2CeO₂ → 2CO is -110.5 Kcal,The enthalpy of combustion carbon is

The equilibrium constant for the following reaction will be 3 A + 2 B → C

The most reactive nucleophile among the following is

A reaction with respect to the reactant A has a rate constant of 5 s⁻¹. If we start with[A]= 10 mol-L⁻¹, then in what time the concentration of A becomes 1.0 mol-L⁻¹?

In an electrochemical cell, if Eº is the EMF of the cell involving 'n' mole of electrons, then ∆Gº is

Aspirin is an acetylation product of

According to Lewis, the ligands are

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

Electromagnetic separation is used in the concentration of

A real gas most closely approaches the behaviour of an ideal gas at

Thermite is a mixture of iron oxide and

The important ore of lead is

What are the products obtained when ammonia is treated with excess of chlorine ?

Sodium sulphate is soluble in water but barium sulphate is insoluble because

The isomers, which possess same structural formula, but differ in spatial arrangement of the group around the double bond, are called

The radioisotope, tritium (³H₁) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many miligrams of it would remain after 49.2 years ?

In the sequence given below Z is

The compound is used in the manufacture of terylene is

Which of the following is a polyamide molecule?

In which of the following reaction there is no change in oxidation number

Which of the following statements is correct?

WBJEE Sample Papers, Section Wise & Full Mock Tests 2026

WBJEE Sample Papers, Section Wise & Full Mock Tests 2026

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WBJEE Sample Papers, Section Wise & Full Chemistry Test - 6 Free Online

MCQ Practice Test & Solutions: WBJEE Chemistry Test - 6 (40 Questions)

NH₄Cl in liquid NH₃ will act as a/an :

Phenols are more acidic than alcohols because

Which of the following does not turn Schiff's reagent to pink ?

Fe(OH)₃ can be separated from Al(OH)₃ by the addition of

Sometimes yellow turbidity appears while passing H₂S gas even in the absence of II group radicals. This is because of

The energy of second Bohr orbit of the hydrogen atom is -328KJ mol⁻1. The energy of fourth Bohr orbit would be

On hydrolysis of starch, we finally get

Among the molecules (a)XeO₃ (b)XeOF (c)XeOF₆,those having same no. of lone pairs on Xe are

The heat of formation of CO₂ is -94 Kcal mol⁻1 whereas ∆H for 2CeO₂ → 2CO is -110.5 Kcal,The enthalpy of combustion carbon is

The equilibrium constant for the following reaction will be 3 A + 2 B → C

The most reactive nucleophile among the following is

A reaction with respect to the reactant A has a rate constant of 5 s⁻1. If we start with[A]= 10 mol-L⁻1, then in what time the concentration of A becomes 1.0 mol-L⁻1?

In an electrochemical cell, if Eº is the EMF of the cell involving 'n' mole of electrons, then ∆Gº is

Aspirin is an acetylation product of

According to Lewis, the ligands are

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

Electromagnetic separation is used in the concentration of

A real gas most closely approaches the behaviour of an ideal gas at

Thermite is a mixture of iron oxide and

The important ore of lead is

What are the products obtained when ammonia is treated with excess of chlorine ?

Sodium sulphate is soluble in water but barium sulphate is insoluble because

The isomers, which possess same structural formula, but differ in spatial arrangement of the group around the double bond, are called

The radioisotope, tritium (3H₁) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many miligrams of it would remain after 49.2 years ?

In the sequence given below Z is

The compound is used in the manufacture of terylene is

Which of the following is a polyamide molecule?

In which of the following reaction there is no change in oxidation number

Which of the following statements is correct?

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 second Bohr orbit of the hydrogen atom is -328KJ mol⁻¹. The energy of fourth Bohr orbit would be

The heat of formation of CO₂ is -94 Kcal mol⁻¹ whereas ∆H for 2CeO₂ → 2CO is -110.5 Kcal,The enthalpy of combustion carbon is

A reaction with respect to the reactant A has a rate constant of 5 s⁻¹. If we start with[A]= 10 mol-L⁻¹, then in what time the concentration of A becomes 1.0 mol-L⁻¹?

The radioisotope, tritium (³H₁) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many miligrams of it would remain after 49.2 years ?