Hydrogen Test

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Hydrogen Test - 54

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Weekly Quiz Competition

Question 1
1 / -0

The amount of $$ H_{2}O_{2} $$ present in 1 L of 1.5 $$ NH_{2}O_{2} $$ solution is

A
2.5 g

B
25.5 g

C
3.0 g

D
8.0 g

Solution

Strength of $$H_2O_2=$$ Normality $$\times$$ Eq. mass

$$ =1.5 \times 17$$ (eq. mass of $$H_{2}O_{2}) $$

$$ = 25.5gL^{-1} $$
Question 2
1 / -0

Metals of groups 7, 8 and 9 do not from metallic hydrides. This is termed as

A
hydride gap

B
hydride shift

C
anhydride

D
dehydride

Solution

Metals of groups 7, 8 and 9 do not from metallic hydrides. This is termed as hydride gap.
Question 3
1 / -0

What is the Boiling point of water and which states of $$H_2O$$ exist at the boiling temperature of the water?

A
100 K, liquid and gas

B
$$100^{\circ} C$$, liquid and solid

C
$$100^{\circ} C$$, liquid and gas

D
100 K, liquid and solid

Solution

Boiling point of water is $$100^{\circ}$$ and $$H_2O$$ exists in Liquid and Gaseous state at it's boiling temperature.
Hence, Option "C" is the correct answer.
Question 4
1 / -0

The structure of $$ H_{2}O_{2} $$ is

A
open book like

B
linear

C
closed book

D
pyramidal

Solution

The structure of $$H_2O_2$$ is open book like as shown.
Question 5
1 / -0

The correct electron dot structure of a water molecule is

A

B

C

D

Solution

This dot structure shows a complete octet after oxygen shared two electrons with two univalent atoms of hydrogen.
Question 6
1 / -0

Reaction between the following pairs will produce $$ H_2 $$ except

A
Na + ethyl alcohol

B
Fe + steam

C
$$ Fe +H_2SO_4 (aq) $$

D
$$ Cu +HCl (aq) $$

Solution

$$ Cu +HCl \rightarrow No \ reaction $$

Copper is less reactive than hydrogen. Therefore it is unable to displace hydrogen from acid.

$$ E^0_{Cu} = +0.34 $$ and $$ E^0_H = 0.00 $$
Question 7
1 / -0

Which of the following reactions increases production of dihydrogen from synthesis gas?

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

B
$$C(s) + H_2O(g) \xrightarrow[]{1270 k} CO(g) + H_2(g)$$

C
$$CO(g) + H_2O \xrightarrow []{673 k} CO_2(g) + H_2(g)$$

D
$$C_2H_6 + 2H_2O \xrightarrow [Ni]{1270 k} CO_2(g) + 5 H_2(g)$$

Solution

The production of dihydrogen can be increased by reacting carbon monoxide of syngas mixtures with steam in the presence of iron chromate as catalyst.
Question 8
1 / -0

Only one element of $$----$$ forms hydride.

A
group 6

B
group 7

C
group 8

D
group 9

Solution

From group 6, only chromium forms CrH.
Question 9
1 / -0

Elements which show unique nature in the preparation of hydrogen are

A
$$Na, \ K, \ Li$$

B
$$Mg, \ Ca, \ Ba$$

C
$$Fe, \ Cu, \ Ag$$

D
$$Al,\ Zn,\ Pb$$

Solution

Elements that show unique nature in the preparation of hydrogen are $$ Al, \ Zn, and \ Pb$$. Aluminium, zinc and lead have unique nature. They react with acids and can even react with hot concentrated alkalis to form hydrogen and soluble salt. Salts (oxides and hydroxide) of these metals are Amphoteric.

Option D is correct.
Question 10
1 / -0

When ice melts to form liquid water at $$0^0C$$, there is a contraction in volume. This is due to :

A
the molecules contracting in size

B
a partial disruption of the hydrogen bonded network of ice on melting

C
the absorption of heat during the melting process

D
the dissolving of air into the water during the melting process

Solution

Ice melts to form liquid water at $$0^oC$$, there contraction in volume is due to a partial disruption of the hydrogen bonded network of ice on melting.