Hydrogen Test

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Hydrogen Test - 47

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Weekly Quiz Competition

Question 1
1 / -0

On an industrial scale $${ H }_{ 2 }{ O }_{ 2 }$$ is prepared by auto oxidation of ______.

A
2- ethylanthraquinol

B
2-ethylanthraquinone

C
1- ethylanthraquinol

D
1- ethylanthraquinone

Solution

(I) 2-Ethyl anthraquinone is reduced to 2-ethyl anthraquinol by $$H_2$$ in the presence of palladium.
(II) This 2-ethyl anthraquinol is oxidised by air to 2-ethyl anthrequinone again. Then $$H_2O_7$$ (20% solution) forms.
Question 2
1 / -0

Hydrogen oxidised is reduced by

A
$$H_2O$$

B
Acidic solution of $$KMnO_{4}$$

C
Berium oxide

D
None of the above
Question 3
1 / -0

Hydrogen peroxide is obtained by the electrolysis of _________

A
water

B
sulpharic acid

C
hydrochoric acid

D
fused sodium

Solution

$$H_2O_2$$ is offained by the electrolysis of sulphuric acid.
$$H_2SO_4\longrightarrow H^++HSO_4^-$$
$$2HSO_4^-\longrightarrow HO_3SOOSO_3H+2e^-$$
$$HO_3SOOSO_3H+2H_2O\longrightarrow 2H_2SO_4+H_2O_2$$
Question 4
1 / -0

Intramolecular H-bonding is present in:

A
$$O-nitrophenol$$

B
$$HCl$$

C
$$HBr$$

D
$$HF$$

Solution

Intramolecular hydrogen bonding takes place in ortho-nitrophenol because of the $$NO_2$$ and OH molecules close proximity to each other and this disrupts the possibility of molecular association.

Hence, the correct option is A.
Question 5
1 / -0

The amount of water recommended by united nations for drinking, washing, cooking and maintaning, proper hygiene is a minimum__________ (i) litre per person/day. This amount is about _____(ii) bucket of water Per Person/day. The upper limit of layer, where all the space between particle of soil and gaps between rocks are filled with water is called ______ (iii) and and it can be recharge by _____(v)._________(vi) is a technique of watering plants by making use of narrow deliver water directly A the base of plants.

A
(i) 60 litre, (iii) water cycle, (v) Bawaris

B
(i) Two and half (iii) water table (vi) drip irrigation

C
(i) 50 litre, (ii) two, (v) seeping

D
(iii) Water cycle (v) infiltration (vi) ground water
Question 6
1 / -0

$$H^+$$ in acid medium is balanced by which of the following species

A
$$O{H^ - }$$

B
$${H_2O }$$

C
$${H_2}$$

D
$${H_2}^ + $$
Question 7
1 / -0

Correct order of ionic character is:

A
$$CaH_2 < BaH_2 < CH_4$$

B
$$CH_4 < CaH_2 < BaH_2$$

C
$$CH_4 < BaH_2 < CaH_2$$

D
$$BaH_2< CaH_2 < CH_4$$

Solution

$$BeH_2 < CaH_2<BaH_2$$

Smaller the size of cation more will be its polarising power. Hence, $$BeH_2$$ will be the least iconic.
"or"
On moving down the group metallic character of metals increases so the ionic character of metal hydride increases.

Hence option B is correct.
Question 8
1 / -0

Water gas is a mixture of

A
carbon monoxide and oxygen

B
carbon monoxide and hydrogen

C
hydrogen and oxygen

D
hydrogen and nitrogen

Solution

Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas. Synthesis gas is a useful product, but requires careful handling due to its flammability and the risk of carbon monoxide poisoning. The water-gas shift reaction can be used to reduce the carbon monoxide while producing additional hydrogen, resulting in water gas.

Synthesis gas is made by passing steam over a red-hot carbon fuel such as coke:

$${\displaystyle {\ {{H_2O}+C\rightarrow {H_2}+CO; \quad \quad (\Delta {\mathit {H}}=+131kJ/mol)}}}$$

The reaction is endothermic, so the fuel must be continually re-heated to keep the reaction going. In order to do this, an air stream, which alternates with the vapor stream, is introduced for the combustion of carbon to take place.

$${\displaystyle { {O_2{}+C\rightarrow CO_2\quad \quad \ (\Delta {\mathit {H}}=-393kJ/mol)}}}$$

Theoretically, to make 6 L of water gas, 5 L of air is required.

Or, alternatively, to prevent contamination with nitrogen, energy can be provided by using pure oxygen to burn carbon into carbon monoxide.

$${\displaystyle { {O_2{}+2C \rightarrow2CO\quad \quad \ (\Delta {\mathit {H}}=-221kJ/mol)}}}$$

In this case 1 L of oxygen will create 5.3 L of pure water gas.

Hence, the correct option is $$\text{B}$$
Question 9
1 / -0

Which of the following ions have highest ionic density?

A
$$H^{+}$$

B
$$Li^{+}$$

C
$$Na^{+}$$

D
$$K^{+}$$

Solution

ionic density means no. of ions present in per unit of volume.

as we know that the size of the H+ ion is less than Li+, Na+, K+.

Thus it will have maximum no. of ions in per unit volume.

Hence, H+ will have maximum ionic density among the options.

Therefore, the option is A.
Question 10
1 / -0

The correct statements among (a) to (d) regarding H$$_2$$ as a fuel are :
(a) It produces less pollutant than petrol.
(b) A cylinder of compressed dihydrogen weighs $$\sim 30$$ times more than a petrol tank producing the same amount of energy.
(c) Dihydrogen is stored in tanks of metal alloys like $$NaNi_5$$
(d) On combustion, values of energy released per gram of liquid dihydrogen and LPG are 50 and 142 kJ, respectively

A
b and d only

B
a, b and c only

C
b, c and d only

D
a and c only

Solution

(a) $$H_2$$ produces less pollution as compared to petrol because on combustion it does not produce carbon mono oxide.

(b) A cylinder of compressed dihydrogen weighs 30 times more than a petrol tank producing the same amount of energy. It has higher calorific value.

(c) Dihydrogen is stored in tanks of metal alloys.

(d) On combustion, the value of energy released per gram of liquid dihydrogen is 142 kJ.

So, B option is correct.

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Re-Attempt Weekly Quiz Competition

Hydrogen Test - 47

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Hydrogen Test - 47

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Question 1

2- ethylanthraquinol

2-ethylanthraquinone

1- ethylanthraquinol

1- ethylanthraquinone

Solution

Question 2

$$H_2O$$

Acidic solution of $$KMnO_{4}$$

Berium oxide

None of the above

Question 3

water

sulpharic acid

hydrochoric acid

fused sodium

Solution

Question 4

$$O-nitrophenol$$

$$HCl$$

$$HBr$$

$$HF$$

Solution

Question 5

(i) 60 litre, (iii) water cycle, (v) Bawaris

(i) Two and half (iii) water table (vi) drip irrigation

(i) 50 litre, (ii) two, (v) seeping

(iii) Water cycle (v) infiltration (vi) ground water

Question 6

$$O{H^ - }$$

$${H_2O }$$

$${H_2}$$

$${H_2}^ + $$

Question 7

$$CaH_2 < BaH_2 < CH_4$$

$$CH_4 < CaH_2 < BaH_2$$

$$CH_4 < BaH_2 < CaH_2$$

$$BaH_2< CaH_2 < CH_4$$

Solution

Question 8

carbon monoxide and oxygen

carbon monoxide and hydrogen

hydrogen and oxygen

hydrogen and nitrogen

Solution

Question 9

$$H^{+}$$

$$Li^{+}$$

$$Na^{+}$$

$$K^{+}$$

Solution

Question 10

b and d only

a, b and c only

b, c and d only

a and c only

Solution

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