Chemical Reactions Test

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Chemical Reactions Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

The characteristic feature of an oxidising agent is that it always

A
gains electrons

B
gets oxidised in a redox reaction

C
contains oxygen

D
is a non-metal

Solution

The characteristic feature of an oxidising agent is that it always gains electrons in a redox reaction and gets reduced.
Question 2
1 / -0

A solution of ammonium chloride in water

A
turns blue litmus red

B
turns red litmus blue

C
does not affect litmus

D
decolourises litmus

Solution

Ammonium chloride is an acidic salt formed by the neutralisation of a weak base by a strong acid. Thus, a solution of ammonium chloride in water turns blue litmus red.
Question 3
1 / -0

In reaction P₄O₁₀ + 6H₂O → 4H₃PO₄, the oxide of phosphorus act as a/an

A
reducing agent

B
catalyst

C
basic anhydride

D
acidic anhydride

Solution

P₄O₁₀, known as phosphorous pentoxide, is formally an anhydride form of phosphoric acid. Anhydrides are known to react with water to form the parent acid compound. Thus, phosphorus pentoxide reacts with water to give phosphorus acid.
Question 4
1 / -0

Consider the following reaction:

C(s) + O₂(g) → CO₂(g) + 94.3 kcal

Which of the given statements is/are true about the reaction?

I. One mole of CO₂ is produced for every two moles of oxygen consumed.
II. The reaction is endothermic.
III. The reaction is exothermic.

A
I and II

B
Only II

C
Only III

D
I and III

Solution

C(s) + O₂(g) → CO₂(g) + 94.3 kcal

The above reaction is exothermic because it is accompanied by the evolution of heat.
Question 5
1 / -0

When chlorine gas is passed through cold and dilute alkali, the following reaction occurs:

CI₂ + 2OH^-→ OCI^- + CI^- + H₂O

In this reaction, chlorine undergoes

A
only reduction

B
both oxidation and reduction

C
only oxidation

D
No change in oxidation state

Solution

It is a disproportionation reaction as Cl₂ is undergoing both oxidation and reduction.

Cl₂ + 2e^-→ 2Cl^- (Reduction)

Cl₂+ 4OH^-→ 2ClO^- + 2H₂O (Oxidation)
Question 6
1 / -0

In which of the following ions does chlorine have the the oxidation state of +5?

A
CIO₄^–

B
CIO₃^–

C
CI₂O₇

D
CIO^–

Solution

In CIO₃^– ion, the oxidation state of chlorine is +5.

1. CIO₄^–
x – 8 = -1
x = - 1 + 8 = +7

2. CIO₃^–
x - 6 = -1
x = - 1 + 6 = +5

3. CI₂O₇
2x – 14 = 0
x = 14/2 = 7

4. CIO^–
x – 2 = -1
x = - 1 + 2 = +1
Question 7
1 / -0

In solution, a double salt furnishes

A
two different cations, other than H⁺

B
two different anions other than OH^–

C
either two different cations other than H⁺ or two different anions other than OH^–

D
two cations and two anions

Solution

In solution form, a double salt furnishes either two different cations other than H⁺ or two different anions other than OH^–.
Question 8
1 / -0

During electrolysis, the reaction at the anode is

A
oxidation

B
reduction

C
hydrolysis

D
hydration

Solution

The apparatus used for electrolysis is an electrolytic cell.

The reaction occuring at the anode (positive electrode) is oxidation and the reaction occuring at the cathode (negative electrode) is reduction.
Question 9
1 / -0

Which of the following options is incorrect regarding oxidation number?

A
Oxidation number of P in PO₄^–3 is +5.

B
Oxidation number of S in H₂SO₄ is +6.

C
Oxidation number of Mn in KMnO₄ is –7.

D
Oxidation number of C in CH₄ is –4.

Solution

KMnO₄ is a neutral compound.
So, oxidation number of Mn = 1 + Mn + (-2)4 = 0
Mn - 7 = 0
Mn = 7
So, the oxidation number of Mn in KMnO₄ is +7.

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Chemical Reactions Test - 2

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Chemical Reactions Test - 2

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Question 1

gains electrons

gets oxidised in a redox reaction

contains oxygen

is a non-metal

Solution

Question 2

turns blue litmus red

turns red litmus blue

does not affect litmus

decolourises litmus

Solution

Question 3

reducing agent

catalyst

basic anhydride

acidic anhydride

Solution

Question 4

I and II

Only II

Only III

I and III

Solution

Question 5

only reduction

both oxidation and reduction

only oxidation

No change in oxidation state

Solution

Question 6

CIO4–

CIO3–

CI2O7

CIO–

Solution

Question 7

two different cations, other than H+

two different anions other than OH–

either two different cations other than H+ or two different anions other than OH–

two cations and two anions

Solution

Question 8

oxidation

reduction

hydrolysis

hydration

Solution

Question 9

Oxidation number of P in PO4–3 is +5.

Oxidation number of S in H2SO4 is +6.

Oxidation number of Mn in KMnO4 is –7.

Oxidation number of C in CH4 is –4.

Solution

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CIO₄^–

CIO₃^–

CI₂O₇

CIO^–

two different cations, other than H⁺

two different anions other than OH^–

either two different cations other than H⁺ or two different anions other than OH^–

Oxidation number of P in PO₄^–3 is +5.

Oxidation number of S in H₂SO₄ is +6.

Oxidation number of Mn in KMnO₄ is –7.

Oxidation number of C in CH₄ is –4.