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11th CBSE Chemistry Hydrogen Model Question Paper

Published on: 19/08/2019

Hydrogen

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Std: 11th Standard CBSE - Chemistry

chapter: - Model Question paper

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Questions:

1 Marks

9 x 1 = 9

Name the phenomenon of adsorption of hydrogen on metal surface.

Name a substance which can oxidise H₂O₂.

Which compounds cause temporary hardness of water?

Write the Lewis structure of hydrogen peroxide.

Name the compound each in which hydrogen exists in positive oxidation state

Name the compound each in which hydrogen exists in negative oxidation state

Which isotope of hydrogen is radioactive?

Name the isotope of hydrogen which contains equal number of protons and neutrons.

Why does hydrogen occur in a diatomic form rather than in a monoatomic form under normal conditions?

Generic 3

5 x 3 = 15

10.

Water molecule is bent, not linear. Explain?

11.

The aqueous solution of H₂O₂ is acidic in nature. Explain with the help of example. Name two substances which catalyse the decomposition reaction of H₂O₂.

12.

Due to this property hydrogen is used for the manufacture of vanaspati ghee from edible oils such as cotton-seed oil, soyabean oil, corn oil etc.

13.

Comment on the reactions of dihydrogen with copper(II) oxide

14.

Calculate the normality of a solution of 1 L of hydrogen peroxide labelled 30 volumes.

Generic 2

5 x 2 = 10

15.

What is the use of hydrogen in the manufacture of Vanaspati Ghee?

16.

What is the cause of bleaching action of H₂O₂?

17.

Which type of hydrides are generally non-stoichiometric in nature?

18.

Which isotope of hydrogen does not have neutron?

19.

Knowing the properties of H₂O and D₂O, do you think that D₂O can be used for drinking purposes?

Generic 5

3 x 5 = 15

20.

Can we use concentrated sulphuric acid and pure zinc in the preparation of dihydrogen?
Write the chemical reactions to show the amphoteric nature of water. Why is hydrogen peroxide stored in wax-lined plastic coloured bottles?

21.

At the home of Mr.Kumar, Dalda ghee is generally used. He is suffering from high blood pressure and diabetes. Mr.Sharma, a friend of Mr.Kumar has advised him to change from ghee to vegetable oil like mustard oil.
Dihydrogen (H₂) is used in the manufacture of vanaspati ghee by hydrogenation of polyunsaturated vegetable oils using nickel as a catalyst.
Vegetable oil \(\xrightarrow [ { H }_{ 2 } ]{ Ni } \) vanaspati ghee
Should we use vegetable oils for cooking? why?

22.

Complete the following chemical reactions and classify the above into (a) hydrolysis,(b) redox and (c) hydration reactions.
\(MnO_{ 4 }^{ - }(aq)+{ H }_{ 2 }{ O }_{ 2 }(aq)\rightarrow \)

Multiple Choice Question

5 x 1 = 5

23.

The decomposition of H₂O₂ is retarded by

(a)

acetanilide

(b)

glycerol

(c)

sodium bicarbonate

(d)

oxalic acid

24.

Zeolite is

(a)

hydrated sodium aluminium silicate - Na₂Al₂Si₂O₈.xH₂O

(b)

hydrated ferric oxide

(c)

sodium hexametaphosphate

(d)

sodium tetraborate

25.

The higher density of water than that of ice is due to

(a)

dipole-dipole interaction

(b)

dipole-induced dipole interaction

(c)

hydrogen bonding

(d)

all of these

26.

On treatment of hard water with zeolite, sodium ions get exchanged with

(a)

Ca²⁺ ions

(b)

Mg²⁺ ions

(c)

H⁺ ions

(d)

OH^-

27.

Hydrogen gas is generally prepared by the

(a)

reaction of granulated zinc with dilute H₂SO₄

(b)

reaction of zinc with conc. H₂SO₄

(c)

reaction of pure zinc with dil. H₂SO₄

(d)

action of steam on red hot coke.

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Answers Key:

1 Marks

9 x 1 = 9

()
Occlusion.

()
Acified KMnO₄.

()
Ca(HCO₃)₂ and Mg (HCO₃)₂

()
the Lewis structure of hydrogen peroxide is

()
HCl, here oxidation state of hydrogen is +1.

()
NaH, here oxidation state of hydrogen is -1.

()
Tritium \(\left({ }_{1}^{3} \mathrm{H}\right)\) is radioactive because neutron/proton ratio is more than 1.5.

()
Deuterium ( \(_{ 1 }^{ 2 }{ H }\))
Number of protons (p) = number of electrons
= atomic number = 1
Number of neutrons (n) = Mass number - atomic number
= 2 - 1 = 1

()
Hydrogen atom has only one electron in its 1s-orbital. So, to achieve stable inert gas configuration of helium, it exists as diatomic molecule and is called dihydrogen.

Generic 3

5 x 3 = 15

10.

In water molecule, O is sp³ hybridized. Due to stronger lone pair-lone pair repulsion than bond pair-bond pair repulsions, the HOH bond angle decreases from 109.5° to 104.5°. Thus water is bent molecule.

11.

The aqueous solution of H₂O₂ is weakly acidic in nature.
H₂O₂ + H₂O \(\rightleftharpoons \) H₃O⁺ + \(HO^-_2\)
It gives two types of salts with alkalies, peroxides and hydroperoxides.
2NaOH + H₂O₂ \(\longrightarrow\) NaO₂ + 2H₂O
\(NaOH+{ H }_{ 2 }{ O }_{ 2 }\longrightarrow \underset { Sodium\\ hydroperoxide }{ { NaOH }_{ 2 } } +{ H }_{ 2 }O\)
MnO₂ and finely divided metals like Pt and Fe catalyse the decomposition of H₂O₂.

12.

Due to this property dihydrogen is used for the manufacture of ammonia (Haber's process)
\(N_{ 2 }(g)+3H_{ 2 }(g)\overset { 673K, \ 200 \ atm }{ \underset { Fe,Mo }{ \rightleftharpoons } } 2NH_{ 3 }(g)\)

13.

Reaction with copper (II) oxide Dihydrogen reduces the copper (II) oxide to metallic copper and itself gets oxidised to water (H₂O).
\({ Cu }_{ 2 }O(s)+{ H }_{ 2 }(g)\rightarrow 2Cu(s)+{ H }_{ 2 }O(l)\)
In Cu₂O the oxidation state of Cu is +2 but in Cu it is present in 0 oxidation state, i.e. dihydrogen reduces Cu from +2 to 0 state.

14.

5.28 N

Generic 2

5 x 2 = 10

15.

H₂ is used as reducing agent to convert vegetable oil into vegetable ghee.

16.

H₂O₂ (l) \(\longrightarrow\) H₂O (l) + O(g)
Nascent oxygen produced is responsible for bleaching action.

17.

Interstitial hydrides are non-stoichiometric in nature.

18.

\(^1_1H\) does not have neutron. It is called protium.

19.

No, because heavy water is injurious to human beings as rate of biochemical reactions decreases in heavy water.

Generic 5

3 x 5 = 15

20.

(a) Conc. H₂SO₄ cannot be used because it acts as an oxidizing agent also and gets reduced to SO_2.
Zn + 2H₂SO₄ (Conc.) \(\rightarrow\) znSO₄ + 2H₂O + SO₂
Pure Zn is not used because it is non-porous and reaction will be slow. The impurities in Zn help in constitute of electrochemical couple and speed up reaction.
(b) water is amphoteric in nature and it behaves both as an acid as well as base. With acids stronger than itself (e.g., H₂S) it behaves as a base and with bases stronger than itself (e.g., NH₃) it acts as an acid.
(i) As a base: H₂O(1) + H₂S(aq) \(\rightarrow\) H₃O(aq) + HS^-(aq)
(ii) As an acid: H₂O(1) + NH₃(aq) \(\rightarrow\) OH^-{aq) + \(NH^+_4\)(aq)
(c) The decomposition of H₂O₂ occurs readily in the presence of rough surface (acting as catalyst). It is also decomposed by exposure of light. Therefore, wax-lined smooth surface and coloured bottles retard the decomposition of H₂O₂.