Hydrogen Test

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Hydrogen Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following compounds are considered to be binary ionic compounds?

A
MgH₂, AlH₃, SiH₄, H₂S

B
BeH₂, B₂H₆, CH₄, NH₃

C
MgH₂, SrH₂, AlH₃, SiH₄

D
NaH, KH, CaH₂, BaH₂

Solution

The hydrides of Group I and Group II elements are binary ionic compounds, and the hydrogen in these hydrides is in -1 oxidation state.
Question 2
1 / -0

Choose the electron precise hydride from among the following:

A
B₂H₆

B
NH₃

C
H₂O

D
CH₄

Solution

The p-block elements form covalent hydrides.
The hydrides of Group 14 are electron precise as the central atom in the molecule has a complete octet.
Question 3
1 / -0

If the hydride ion (H^-) is a stronger base than the hydroxide ion (OH^-), then which of the following reactions will occur when sodium hydride (NaH) is dissolved in water?

A
H^- (aq) + H₂O (l) → H₃O⁺ (aq)

B
H^- (aq) + H₂O (l) → OH^- (aq) + H₂ (g)

C
H^- + H₂O → No reaction

D
Any of these depending upon temperature

Solution

Hydride ion, being a stronger base than OH^- ion, will accept a proton from water to form hydrogen gas.
Question 4
1 / -0

Which group(s) of the d-block in the modern periodic table do(es) not form hydrides at all?

A
Group 3

B
Group 4 and Group 5

C
Group 6

D
Group 7 and Group 8

Solution

In the d-block, the elements of groups 3, 4 and 5 form interstitial hydrides. In the group 6, chromium alone forms CrH. The metals of groups 7, 8 and 9 do not form hydrides. This region of periodic table from group 7 to group 9 is referred to as the hydride gap.
Question 5
1 / -0

Which of the following is a property of interstitial hydrides?

A
They give rise to metals fit for fabrication.

B
They generally form non-stoichiometric species.

C
They can be used as hydrogenation catalysts.

D
The hydrogen dissolved in titanium improves its mechanical properties.

Solution

The composition of these hydrides may not correspond to simple whole number ratio, and therefore, they are also called non-stoichimotric hydrides. Hence, the second statement is correct.
The hydrogen dissolved in titanium does not improve its mechanical properties, rather the hydride formation is accompanied by a considerable volume expansion, which in turn, can embrittle the alloy.
Question 6
1 / -0

Which of the following elements forms true peroxides?

A
Nitrogen

B
Manganese

C
Barium

D
Sulphur

Solution

True peroxides are the peroxides of groups IA and IIA, like Na₂O₂ and BaO₂. Thus, among the given elements, only barium forms a true peroxide.
Question 7
1 / -0

The oxidation states of most electronegative elements in the products of the reaction of BaO₂ with dil. H₂SO₄ are

A
0 and -1

B
-2 and -1

C
-2 and 0

D
-2 and +1

Solution

BaO₂ + H₂SO₄ → BaSO₄ + H₂O₂

Oxidation state of 'O' in BaSO₄ is -2.

Oxidation state of 'O' in H₂O₂is -1.
Question 8
1 / -0

Which of the following can be reduced by hydrogen peroxide in an acidic medium?

A
Ferrous sulphate

B
Potassium ferrocyanide

C
Potassium iodide

D
Potassium permanganate

Solution

KMnO₄ is a stronger oxidising agent than H₂O₂ and can oxidise it to O₂.
Therefore, H₂O₂ reduces acidified potassium permanganate solution to colourless manganese sulphate, and as a result, the pink colour of KMnO₄ is discharged.

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Hydrogen Test - 7

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Hydrogen Test - 7

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Question 1

MgH2, AlH3, SiH4, H2S

BeH2, B2H6, CH4, NH3

MgH2, SrH2, AlH3, SiH4

NaH, KH, CaH2, BaH2

Solution

Question 2

B2H6

NH3

H2O

CH4

Solution

Question 3

H- (aq) + H2O (l) → H3O+ (aq)

H- (aq) + H2O (l) → OH- (aq) + H2 (g)

H- + H2O → No reaction

Any of these depending upon temperature

Solution

Question 4

Group 3

Group 4 and Group 5

Group 6

Group 7 and Group 8

Solution

Question 5

They give rise to metals fit for fabrication.

They generally form non-stoichiometric species.

They can be used as hydrogenation catalysts.

The hydrogen dissolved in titanium improves its mechanical properties.

Solution

Question 6

Nitrogen

Manganese

Barium

Sulphur

Solution

Question 7

0 and -1

-2 and -1

-2 and 0

-2 and +1

Solution

Question 8

Ferrous sulphate

Potassium ferrocyanide

Potassium iodide

Potassium permanganate

Solution

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MgH₂, AlH₃, SiH₄, H₂S

BeH₂, B₂H₆, CH₄, NH₃

MgH₂, SrH₂, AlH₃, SiH₄

NaH, KH, CaH₂, BaH₂

B₂H₆

NH₃

H₂O

CH₄

H^- (aq) + H₂O (l) → H₃O⁺ (aq)

H^- (aq) + H₂O (l) → OH^- (aq) + H₂ (g)

H^- + H₂O → No reaction