Hydrogen Test

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Hydrogen Test - 59

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Weekly Quiz Competition

Question 1
1 / -0

The production of dihydrogen obtained from coal gasification can be increased by reacting carbon monoxide of syngas mixture with steam in presence of a catalyst iron-chromium. What is this process called?

A
Hydrogen reaction

B
Water-gas shift reaction

C
Coal-gas shift reaction

D
Syn gasification

Solution

The production of dihydrogen can be increased by reacting carbon monoxide of syngas with steam. This is called water-gas shift reaction.

$$CO({g}) + H_{2}O({g}) \xrightarrow[Catalyst]{673 K} CO_2({g}) + H_2({g})$$
Question 2
1 / -0

Given below are two reaction of water with sodium and carbon dioxide, what is the nature of water in these reaction?
(i)$$2Na+2H_2O\rightarrow 2NaOH +H_2$$
(ii)$$6CO_2+12H_2O\rightarrow C_6H_12_6+6H_2O+6O_2$$

A
In (ii) water acts as an oxidising agent and in (i) it acts as a reducing agent

B
In (i) water acts as an oxidising agent and in (ii) it acts as a reducing agent

C
In both (i) and (ii) hydrogen acts as a reducing agent

D
In both (i) and (ii) hydrogen acts as an oxidizing agent

Solution

With sodium metal water acts as an oxidizing agent gets reduced to $$H_2$$ and with $$CO_2$$ water acts as a reducing agent and is oxidized to oxygen
Question 3
1 / -0

Which of the following is not a process of preparation of hydrogen peroxide?

A
Auto-oxidation of 2-ethylanthraquinol.

B
By passing oxygen through boiling water

C
By oxidation of isopropyl alcohol

D
By reaction of barium peroxide with dil. $$H_2SO_4$$

Solution

Preparation of 2-ethylanthraquinol
preparation of $$ H_{2}O_{2}$$
(i) 2- ethylanthrquinol $$ \xrightarrow[H_{2}/pd]{O_{2}}H_{2}O_{2}+ $$ oxidized product
(ii) By reaction of barium oxide (per)with
dif.$$H_{2}SO_{4}$$
$$ BaO_{2}.8H_{2}O(s)+H_{2}SO_{4}\rightarrow BaSO_{4}+H_{2}O_{2}+8H_{2}O$$
(iii) By oxidation of is propyl (alcohol)
Option B will not give $$ H_{2}O_{2}$$
Question 4
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Strength of 10 volume hydrogen peroxide solution is:

A
$$30.35\ g\ L^{-1}$$

B
$$17\ g\ L^{-1}$$

C
$$34\ g\ L^{-1}$$

D
$$68\ g\ L^{-1}$$

Solution

Concentration (in g/L) $$= \dfrac {680}{224} \times $$ volume strength

Concentration (in g/L) $$= \dfrac {680}{224} \times 10= 30.35 \ g/L$$
Question 5
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Study the following reactions and mark the correct properties shown by water :
(i) $$SO_{3} + H_{2}O \rightarrow H_{2}SO_{4}$$
(ii) $$Cl_{2}O_{7} + H_{2}O \rightarrow 2HClO_{4}$$
(iii)$$Na_{2}O + H_{2}O \rightarrow 2NaOH $$
(iv)$$CaO + H_{2}O \rightarrow Ca (OH)_{2}$$

A
All oxides react with water to give hydroxides

B
Acidic oxides are formed by metals and basic oxides by non-metals

C
Non-metal oxides combine with water to form acids while metallic oxides combine with water to form alkalies

D
Acidic oxides are stronger than basic oxides since they form strong acids

Solution

(i) $$ SO_{3}+H_{2}O\rightarrow H_{2}SO_{4}$$
(ii)$$Cl_{2}O_{7}+H_{2}O\rightarrow 2HClO_{4}$$
$$ SO_{3}$$ and $$ Cl_{2}O_{7}$$ are non metallic oxides form acid on reacting with water
(iii)$$ Na_{2}O+H_{2}O \rightarrow 2NaOH$$
(iv) $$ CaO+H_{2}O \rightarrow Ca(OH)_{2}$$
$$ Na_{2}O $$ and $$ CaO $$ are metallic oxide form base on reacting with water
Ans (C) Non metal oxides combines with water to form acids while metallic oxides combine with water to form alkalies.
Question 6
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What is the reaction given below, called?
$$H_{2}O_{(l)} + H_{2}O_{(l)} \rightleftharpoons H_{3}O^{+}_{(aq)} + OH^{-}_{(aq)}$$

A
Hydrolysis of water

B
Hydration of water

C
Disproportionate of water

D
Auto-protolysis of water

Solution

The reaction in which two molecules of the same species react to give ions by proton transfer is known as auto-protolysis or self ionisation. In this reaction, proton from one $$ H_{2}O$$ molecule is transferred to another $$H_{2}O $$ molecule.
$$H_{2}O({l}) + H_{2}O(l) \rightleftharpoons H_{3}O^{+}({aq}) + OH^{-}({aq})$$

Question 7

1 / -0

Match the reactions of column I with their types given in column II and mark the appropriate choice.

	Column I		Column II
A	$$H_{2}O + NH_{3} \rightleftharpoons NH^{+}_{4} + OH$$	i	Self ionisation of $$H_{2}O$$
B	$$FeCl_{3} + 3H_{2}O \rightarrow Fe (OH)_{3} + 3HCl $$	ii	Decomposition
C	$$H_{2}O + H_{2}O \rightleftharpoons H_{3}O^{+} + OH$$	iii	Acidic nature of $$H_{2}O$$
D	$$2H_{2}O \rightarrow 2H_{2} + O_{2}$$	iv	Hydrolysis

(A)$$\rightarrow $$(ii), (B) $$\rightarrow $$(i), (C)$$\rightarrow $$(iii), (D)$$\rightarrow$$ (iv)

(A)$$\rightarrow $$(iii), (B)$$ \rightarrow $$(ii), (C)$$\rightarrow$$ (iv), (D)$$\rightarrow $$(i)

(A)$$\rightarrow$$ (i), (B) $$\rightarrow$$ (ii), (C)$$\rightarrow $$(iv), (D)$$\rightarrow$$ (iii)

(A)$$\rightarrow$$ (iii), (B)$$ \rightarrow $$(iv), (C)$$\rightarrow$$ (i), (D)$$\rightarrow $$(ii)

Solution

(A) $$ H_{2}O+NH_{3}\rightleftharpoons NH_{4}+OH^{-}$$

Here $$ NH_{3}$$ is Lewis base and $$ H_{2}O $$

acid as acid to it represents

acidic nature of $$ H_{2}O $$

(b)$$ F_{e}Cl_{3}+ H_{2}O \rightarrow F_{e}(OH)_{3}+3HCl$$

it is are example of hydrolysis

reaction which produces acid and base

self ionisation of water

(D) $$ 2H_{2}O\rightarrow 2H_{2}+O_{2}$$

Decomposition of water in their

corresponding molecule

(A)-(iii), (B)-(iv), (C)-(i), (D)-(ii)

Question 8
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Which of the following reagents cannot be used for the preparation of hydrogen peroxide?

A
Sodium peroxide

B
2- Ethylanthraquinol

C
Sodium thiosulphate

D
Barium Peroxide

Solution

Sodium thiosulphate cannot be used for the preparation of hydrogen peroxide. Instead, electrolysis of ammonium hydrogen sulphate (ammonium sulphate + $$H_2SO_4$$) can be carried out.
Question 9
1 / -0

A commercial sample of hydrogen peroxide is labelled as $$10$$ volume. Its percentage strength is nearly ?

A
$$3\%$$

B
$$1\%$$

C
$$90\%$$

D
$$10\%$$

Solution

Percent concentration $$= \dfrac {68}{224} \times $$ volume strength

Percent concentration $$= \dfrac {68}{224} \times 10=3$$ %.
Question 10
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Water plays a key role in the biosphere, It is due to certain properties of $$H_2O$$ as compared to other liquids. These are except:

A
higer specific heat

B
lesser thermal conductivity

C
high dielectric constant

D
high surface tension

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Hydrogen Test - 59

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Hydrogen Test - 59

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Question 1

Hydrogen reaction

Water-gas shift reaction

Coal-gas shift reaction

Syn gasification

Solution

Question 2

In (ii) water acts as an oxidising agent and in (i) it acts as a reducing agent

In (i) water acts as an oxidising agent and in (ii) it acts as a reducing agent

In both (i) and (ii) hydrogen acts as a reducing agent

In both (i) and (ii) hydrogen acts as an oxidizing agent

Solution

Question 3

Auto-oxidation of 2-ethylanthraquinol.

By passing oxygen through boiling water

By oxidation of isopropyl alcohol

By reaction of barium peroxide with dil. $$H_2SO_4$$

Solution

Question 4

$$30.35\ g\ L^{-1}$$

$$17\ g\ L^{-1}$$

$$34\ g\ L^{-1}$$

$$68\ g\ L^{-1}$$

Solution

Question 5

All oxides react with water to give hydroxides

Acidic oxides are formed by metals and basic oxides by non-metals

Non-metal oxides combine with water to form acids while metallic oxides combine with water to form alkalies

Acidic oxides are stronger than basic oxides since they form strong acids

Solution

Question 6

Hydrolysis of water

Hydration of water

Disproportionate of water

Auto-protolysis of water

Solution

Question 7

(A)$$\rightarrow $$(ii), (B) $$\rightarrow $$(i), (C)$$\rightarrow $$(iii), (D)$$\rightarrow$$ (iv)

(A)$$\rightarrow $$(iii), (B)$$ \rightarrow $$(ii), (C)$$\rightarrow$$ (iv), (D)$$\rightarrow $$(i)

(A)$$\rightarrow$$ (i), (B) $$\rightarrow$$ (ii), (C)$$\rightarrow $$(iv), (D)$$\rightarrow$$ (iii)

(A)$$\rightarrow$$ (iii), (B)$$ \rightarrow $$(iv), (C)$$\rightarrow$$ (i), (D)$$\rightarrow $$(ii)

Solution

Question 8

Sodium peroxide

2- Ethylanthraquinol

Sodium thiosulphate

Barium Peroxide

Solution

Question 9

$$3\%$$

$$1\%$$

$$90\%$$

$$10\%$$

Solution

Question 10

higer specific heat

lesser thermal conductivity

high dielectric constant

high surface tension

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