Important one marks questions Hydrogen

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Questions:

Multiple Choice Question

50 x 1 = 50

Hydrogen combines with carbon monoxide in the presence of copper catalyst will synthesise _____________

(a)

Ethanol

(b)

Methane

(c)

Methanol

(d)

Methanal

Which one of the following is manufactured in Haber's process?

(a)

SO₃

(b)

NH₃

(c)

N₂

(d)

H₂

The products formed during the cracking long chain hydrocarbon C₆H₁₂are _____________

(a)

CO₂ + H₂O

(b)

CO + H₂

(c)

C₆H₁₀ + H₂

(d)

C₆H₆ + 3H₂

Consider the following statements.
(i) Hydrogen is a colourless, odourless, tasteless heavy and highly inflammable gas.
(ii) Hydrogen is a good reducing agent.
(iii) Hydrogen can be liquefied under low pressure and high temperature.
Which of the above statements is/are not correct?

(a)

(i) only

(b)

(ii) only

(c)

(i) and (iii)

(d)

(ii) and (iii)

Which of the following mixture of gases is called water gas?

(a)

CO_2(g)+ H_2(g)

(b)

CO_(g)+ N_2(g)

(c)

CO_(g)+ H_2(g)

(d)

N_2(g)+ H_2(g)

Consider the following statements.
(i) Tritium is a beta emitting radioactive isotope of hydrogen.
(ii) Deuterium is known as heavy hydrogen.
(iii) Deuterium is used in emergency exit signs.
Which of the following statement is/are not correct?

(a)

(i) only

(b)

(iii) only

(c)

(i) and (ii)

(d)

(i), (ii) and (iii)

Which of the following is produced by bombardment of neutrons with lithium?

(a)

Deuterium

(b)

Protium

(c)

Tritium

(d)

Beryllium

By which rays nuclear reactions are induced in upper atmosphere to produce tritium?

(a)

α-rays

(b)

β-rays

(c)

\(\gamma\)-rays

(d)

cosmic rays

Which one of the following is used to study the movements of ground water?

(a)

Deuterium

(b)

Protium

(c)

Tritium

(d)

10.

Which of the following is used in illumination of wrist watches?

(a)

Phosphorous

(b)

Radon

(c)

Tritium

(d)

Deuterium

11.

Which one of the following does not contain neutron?

(a)

ordinary hydrogen

(b)

Heavy hydrogen

(c)

Radioactive hydrogen

(d)

Deuterium

12.

The magnetic moment of para hydrogen is __________

(a)

one

(b)

zero

(c)

twice

(d)

maximum

13.

Which of the following is not used in the conversion of para hydrogen into ortho hydrogen?

(a)

by heating more than 800°C

(b)

by passing an electric discharge

(c)

by mixing with atomic hydrogen

(d)

by mixing with diamagnetic molecules

14.

Consider the following statements.
(i) In ortho form of hydrogen molecule, the nuclear spins are opposed to each other.
(ii) The magnetic moment of para hydrogen is twice that of ortho hydrogen.
(iii) By passing an electric discharge, para hydrogen can be converted into ortho hydrogen.
Which of the above statement is/are not correct?

(a)

(i) only

(b)

(iii) only

(c)

(i) and (ii)

(d)

(ii) and (iii)

15.

Which one of the metal is used to convert para hydrogen into ortho hydrogen?

(a)

Copper

(b)

Aluminium

(c)

Sodium

(d)

Platinum

16.

At room temperature normal hydrogen consists of ______________

(a)

25% ortho form + 75% para form

(b)

50% ortho form + 50% para form

(c)

75% ortho form + 25% para form

(d)

60% ortho form + 40% para form

17.

__________ is the most abundant 90% of all atoms

(a)

Lithium

(b)

Hydrogen

(c)

Oxygen

(d)

Silicon

18.

Which one of the following element mostly present in the sun and the stars?

(a)

Hydrogen

(b)

Lithium

(c)

Helium

(d)

Beryllium

19.

In which of the following reactions H₂O₂ act as a reducing agent?
(i) H₂O₂ + 2H⁺ + 2e \(\rightarrow\) 2H₂O
(ii) H₂O₂ - 2e \(\rightarrow\) O₂ + 2H⁺
(iii) H₂O₂ + 2e \(\rightarrow\) 2OH^-
(iv) H₂O₂ + 2OH^- - 2e \(\rightarrow\) O₂ + 2H₂O

(a)

(ii) and (iv)

(b)

(i) and (ii)

(c)

(iii) and (iv)

(d)

(i) and (iii)

20.

The reagent used for softening of the temporary hardness of water is/are
(i) Ca₃ (PO₄)₂
(ii) Ca(OH)₂
(iii) Na₂CO₃
(iv) NaOCI

(a)

(ii) and (iii)

(b)

(i) and (iii)

(c)

(ii) and (iv)

(d)

(i) and (iv)

21.

When zeolite, which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with __________

(a)

H⁺ ions

(b)

Ca⁺² ions

(c)

SO₄^-2 ions

(d)

Mg⁺² ions

22.

Bond angles in H -O-Hand H -O-Oin water and H₂O₂ respectively are __________

(a)

104° 5',104° 5'

(b)

94.8°, 94.8°

(c)

104° 5', 94.8°

(d)

94.8°,104.5°

23.

\(Ag_2O+H_2O_2\rightarrow2Ag+H_2O+O_2\)In this reaction H₂O₂ acts as ______________

(a)

reducing agent

(b)

oxidising agent

(c)

bleaching agent

(d)

none of these

24.

Which of the following compounds is a peroxide?

(a)

KO₂

(b)

BaO₂

(c)

MnO₂

(d)

NO₂

25.

When sodium peroxide is treated with dilute sulphuric acid the products are _____________

(a)

sodium sulphate and water

(b)

sodium sulphate and oxygen

(c)

sodium sulphate, hydrogen and oxygen

(d)

sodium sulphate and hydrogen peroxide

26.

Which of the following reactions increases the production of di-hydrogen from synthesis gas?

(a)

\(CH_4(g)+H_2O(g)\xrightarrow[Ni]{1270k}CO(g)+3H_2(g)\)

(b)

\(C(s)+H_2O(g)\xrightarrow{1270k}CO(g)+H_2(g)\)

(c)

\(CO(g)+H_2O(g)\xrightarrow[catalyst]{673k}CO(s)+H_2(g)\)

(d)

\(C_2H_6(g)+2H_2O(g)\xrightarrow[Ni]{1270k}2CO(g)+5H_2(g)\)

27.

Consider the reactions:
(i) H₂O₂ + 2HI \(\rightarrow\) I₂+ 2H₂O
(ii) HOCI + H₂O₂ \(\rightarrow\) H₃O⁺+ CI^- + O₂
Which of the following statements is correct about H₂O₂ with reference to the above reactions?

(a)

an oxidising agent in both (i) and (ii)

(b)

an oxidising agent in (i) and reducing agent in (ii)

(c)

a reducing agent in (i) and oxidising agent in (ii)

(d)

a reducing agent in both (i) and (ii)

28.

Which of the following is electron precise hydride?

(a)

B₂H₆

(b)

NH₃

(c)

H₂0

(d)

CH₄

29.

Metal hydrides are ionic,covalent or molecular in nature. Among LiH, NaH, KH, RbH, CsH the correct order of increasing ionic character is ___________

(a)

LiH >NaH > CsH > KH > RbH

(b)

LiH

(c)

RbH > CsH > NaH > KH > LiH

(d)

NaH > CsH > RbH> LiH > KH

30.

Hydrogen resembles halogens in many respects for which several factors are responsible of the following factors which one is most important in this respect _____________

(a)

Its tendency to lose an electron and form a cation.

(b)

Its tendency to gain an electron in its valence shell to attain stable electronic configuration.

(c)

Its low electron gain enthalpy.

(d)

Its small size

31.

Which of the following dissociate more readily?

(a)

H₂O

(b)

D₂O

(c)

T₂O

(d)

H₂ all dissociate to the same extent

32.

CO₂ + K₂CO₃ + H₂O \(\rightarrow\) X. The product X is ______________

(a)

KHCO₃

(b)

CO₂

(c)

H₂CO₃

(d)

KOH

33.

Choose the correct statement with regard to ortho and para hydrogen.
1. Both have similar chemical properties but differ in some physical properties.
2. The boiling points of normal, ortho and para hydrogens are the same.
3. The nuclear spin in both forms are the same.
4. Para hydrogen has zero magnetic moment.

(a)

1,2

(b)

1,4

(c)

2, 3

(d)

2, 4

34.

Normal hydrogen consists of ____________

(a)

75% ortho form and 25% para form

(b)

25% ortho form and 75% para form

(c)

80% ortho form and 20% para form

(d)

20% ortho form and 80% para form

35.

Choose the incorrect statement:

(a)

The boiling points of both deuterium and tritium are higher than that of protium.

(b)

The inter nuclear distances between the two bonded atoms are different in all the isotopes.

(c)

Enthalpy of dissociation is high in tritium

(d)

both (b) and (c)

36.

Among the isotopes of hydrogen, which has higher mass and radio active?

(a)

Protium

(b)

Tritium

(c)

Deuterium

(d)

both deuterium and tritium

37.

The number of electrons, protons and neutrons in protium, deuterium and tritium are respectively _______________

(a)

1, 1,0; 1, 1, 1 ; 1, 1,2

(b)

1, 1, 1 ; 1, 1,0; 1, 1,2

(c)

1,1,2; 1, 1,0; 1, 1, 1

(d)

1,1,1; 1, 1,0; 1, 1,2

38.

The element which does not contain a neutron is _____________

(a)

hydrogen

(b)

helium

(c)

chlorine

(d)

none of the above

39.

Intramolecular H-bonding is present in _________

(a)

o-nitrophenol

(b)

salicylic acid

(c)

salicylaldehyde

(d)

all of these

40.

Which one of the following bond is stronger?

(a)

Covalent

(b)

H-bond

(c)

Vanderwaal's force

(d)

All of these

41.

The intramolecular hydrogen bonding in molecules lead to _____________

(a)

high melting point

(b)

low boiling point

(c)

high boiling point

(d)

high solubility in water

42.

Intermolecular H-bonding is present in __________

(a)

(b)

H₂O

(c)

C₂H₅OH

(d)

All of these

43.

Ionic hydrides are usually ____________

(a)

good conductors of electricity in solid state

(b)

volatile

(c)

non-crystalline

(d)

stoichiometric compounds

44.

Statement I : The O-O bond length in H₂O₂ is shorter than that of O₂F₂ .
Statement II : H₂O₂ is an ionic compound.

(a)

Both statement I and II are true and statement II explains statement I

(b)

Both statement I and II are true but statement II does not explain statement I

(c)

Statement I is true but statement II is false

(d)

Both the statements are false.

45.

H₂O andH₂O₂ resemble in _____________

(a)

Bond angle

(b)

Hybridization of oxygen

(c)

Structure

(d)

Oxidation state of oxygen

46.

The reaction H₂O₂ ➝ H₂O + O₂ represents, ____________.

(a)

Oxidation of H₂O₂

(b)

reduction of H₂O

(c)

disproportionation of oxygen

(d)

acidic nature of H₂O₂

47.

H₂O₂ acts as __________

(a)

oxidising agent

(b)

reducing agent

(c)

bleaching agent

(d)

All of these

48.

What is the dihedral angle of H₂O₂ in gas and solid phase?

(a)

111.5° and 90.2°

(b)

115.1° and 92°

(c)

92° and 115.1°

(d)

902° and 111.5°

49.

Acetic acid exist as a __________

(a)

monomer

(b)

dimer

(c)

trimer

(d)

octamer

50.

HF has ______ hydrogen bond.

(a)

intramolecular

(b)

intermolecular

(c)

intrastellar

(d)

interstellar

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Answers Key:

Multiple Choice Question

50 x 1 = 50

(b)
NH₃

(d)
C₆H₆ + 3H₂

(b)
(iii) only

(d)
cosmic rays

(a)
Deuterium

10.

11.

(a)
ordinary hydrogen

12.

(b)
zero

13.

(d)
by mixing with diamagnetic molecules

14.

15.

(d)
Platinum

16.

17.

(b)
Hydrogen

18.

(a)
Hydrogen

19.

(b)
(i) and (ii)

20.

(a)
(ii) and (iii)

21.

(a)
H⁺ ions

22.

23.

(a)
reducing agent

24.

(b)
BaO₂

25.

(d)
sodium sulphate and hydrogen peroxide

26.

27.

(b)
an oxidising agent in (i) and reducing agent in (ii)

28.

(d)
CH₄

29.

(b)
LiH

30.

(b)
Its tendency to gain an electron in its valence shell to attain stable electronic configuration.

31.

(a)
H₂O

32.

(b)
CO₂

33.

(b)
1,4

34.

(a)
75% ortho form and 25% para form

35.

(b)
The inter nuclear distances between the two bonded atoms are different in all the isotopes.

36.

(b)
Tritium

37.

(a)
1, 1,0; 1, 1, 1 ; 1, 1,2

38.

(a)
hydrogen

39.

(d)
all of these

40.

(a)
Covalent

41.

(b)
low boiling point

42.

(d)
All of these

43.

(d)
stoichiometric compounds

44.

(d)
Both the statements are false.

45.

(b)
Hybridization of oxygen

46.

47.

(d)
All of these

48.

(a)
111.5° and 90.2°

49.

(b)
dimer

50.

(b)
intermolecular

Important one marks questions in plus one english medium chemistry chapter one Hydrogen

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