Hydrogen Test

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Hydrogen Test - 46

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Weekly Quiz Competition

Question 1
1 / -0

Which combination do not produce $${ H }_{ 2 }$$ except:-

A
Au + cold water

B
Cu + aq.$${ H }_{ 2 }{ SO }_{ 4 }$$

C
Pt + $$dil.{ HNO }_{ 3 }$$

D
All of these

Solution

Because gold (Au) is the least reactive metal, even less than hydrogen, now as Hydrogen is more reactive, gold cannot displace it, hence water and gold will not react.

$$Cu$$ can't liberate $$H_2$$ from $$H_2SO_4$$ and same case with $$Pt$$ and $$HNO_3$$.

Hence option D is correct.
Question 2
1 / -0

Which of the following has maximum purity

A
River water

B
Distilled water

C
Rain water

D
none

Solution

$$ \begin{array}{l} \text { Distilled water is water that has been boiled} \\ \text { into vapour and condensed back into liquid in a } \\ \text { seperate container. Impurities in the original } \\ \text { water that do not boil below or near the} \\ \text { boiling point of water remain in the original } \\ \text { container. } \\ \text { So, Distilled water has maximum purity. } \\ \text { (B) Distilled water. } \end{array} $$
Question 3
1 / -0

The physical state of water is liquid at which of the following temperatures?

A
$$25^o C$$

B
$$0^oC$$

C
$$100^oc$$

D
none of these

Solution

At 0$$ ^{\circ}C $$, water exists as ice.
At 100$$ ^{\circ}C $$, it exists as steam.
At 25$$ ^{\circ}C $$, water exists in liquid form.
Question 4
1 / -0

Very pure hydrogen $$(99.9\%)$$ can be made by which of the following processes?

A
Mixing natural hydrocarbons of high molecular weight

B
Electrolysis of water

C
Reaction of salt like hydrides with water

D
Reaction of methane with steam.

Solution

Electrolysis of water gives $$99.9$$% pure hydrogen.

It is the decomposition of water into Oxygen $$(O_2)$$ and Hydrogen gas $$(H_2)$$, due to an electric current being passed through the water.

So, option (B) is correct.
Question 5
1 / -0

Very pure hydrogen (99.9%) can be made by 'which of the following processes?

A
Reaction of methane with steam

B
Mixing natural hydrocarbons of high molecular weight

C
Elecrolysis of water

D
Reaction of salt like hydrides with water

Solution

Highly pure hydrogen can be obtained by electrolysis of water.
It is the decomposition of water into $$O_2$$ & $$H_2$$ gas by passing electric current.
At anode, $$6H_2O(l) \longrightarrow O_2(g)+4H_3O^++4e^-$$
cathode, $$4e^-+4H_2O(l) \longrightarrow 2H_2(g)+4OH^-(aq)$$
Overall $$\longrightarrow 2H_2O(l) \longrightarrow 2H_2(g)+O_2(g)%$$
Question 6
1 / -0

Which of the following reaction will not produce hydrogen gas?

A
Reaction between $$Fe$$ and dil. $$HCl$$

B
Reaction between $$Zn$$ and conc. $$ H_{2}SO_{4} $$

C
Reaction between $$Zn$$ and $$NaOH$$

D
Electrolysis of $$NaCl$$ in Nelson's cell

Solution

$$a)$$ $$Fe_{(s)}+2HCl_{(aq)}\longrightarrow FeCl_{2(aq)}+H_{2(g)}$$
$$b)$$ $$Zn+conc.\text{ }2H_2SO_4\longrightarrow ZnSO_4+SO_2+2H_2O$$
$$c)$$ $$Zn+2NaOH\longrightarrow Na_2ZnO_2+H_2$$
$$d)$$ In Nelson's cell, at cathode:
$$2H_2O+2e^-\rightleftharpoons H_2+2OH^-$$
Hence, $$B$$ is the correct answer.
Question 7
1 / -0

Which of the following compound will evolve $$H_{2}$$ gas when reacts with alkali metals?

A
$$H_{2}C =CH_{2}$$

B
$$R-O-R$$

C
$$R-CH_{3}$$

D
$$R-OH$$

Solution

Alcohols when reacting with sodium metal evolution of hydrogen gas takes place. For example ethyl alcohol (ethanol) when reacting with sodium metal, the formation of sodium ethoxide and hydrogen gas takes place. It can be shown by the following reaction.
$$\underset{alcohol}{2R-OH} + 2Na \longrightarrow \underset{sodium \ alkoxide}{2R-O^{-}Na^{+}} + H_{{2}{(g)}}\uparrow$$

$$\underset{Ethanol}{2R-OH} + 2Na \longrightarrow \underset{sodium \ ethoxide}{2R-O^{-}Na^{+}} + H_{{2}{(g)}}\uparrow$$

Hence, option $$D$$ is correct.
Question 8
1 / -0

$${ H_{ 2 }O }_{ 2 }$$ is:

A
oxidising agent

B
both oxidising and reducing agent

C
reducing agent

D
none of the above

Solution

$$H_2O_2$$ is both oxidizing as well as reducing agent.
These two chemical equation shows different behaviour of $$H_2O_2$$ :-
$$\longrightarrow H_2O_2+2I^-+2H^+ \longrightarrow I_2+2H_2O$$
$$\longrightarrow 5H_2O_2+2MnO^-_4+6H^+ \longrightarrow 2Mn^{2+}$$
In first reaction $$H_2O_2$$ act as an oxidizing agent as oxidation states change from $$-1$$ to $$-2$$.
In $$2^{nd}$$ reaction $$H_2O_2$$ act as reducing agent as oxidation state of $$Mn$$ changes from $$+7$$ to $$+2$$ by $$H_2O_2$$ (itself gets oxidized).
Question 9
1 / -0

Hydrogen peroxide is now generally prepared to industrial scale by the:

A
action of $$H_{2}SO_{4}$$ on barium peroxide

B
action of $$H_{2}SO_{4}$$ on sodium peroxide

C
electrolysis of $$50$$% $$H_2SO_4$$

D
burning hydrogen in excess of oxygen

Solution

Hydrogen peroxide is prepared from barium peroxide by the following methods.
By the action of dilute sulphuric acid. A paste of hydrated barium peroxide ($$BaO_2.8H_2O$$) is prepared in ice – cold water and then added slowly to an ice-cold solution of 20% $$H_2SO_4.$$
Question 10
1 / -0

Water released from dams is measured in?

A
Feet per second or CFS

B
Liters

C
Cusesc

D
Feet

Solution

Water retained from dams is measured in cubic feet per second or CFS.

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Hydrogen Test - 46

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Hydrogen Test - 46

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Question 1

Au + cold water

Cu + aq.$${ H }_{ 2 }{ SO }_{ 4 }$$

Pt + $$dil.{ HNO }_{ 3 }$$

All of these

Solution

Question 2

River water

Distilled water

Rain water

none

Solution

Question 3

$$25^o C$$

$$0^oC$$

$$100^oc$$

none of these

Solution

Question 4

Mixing natural hydrocarbons of high molecular weight

Electrolysis of water

Reaction of salt like hydrides with water

Reaction of methane with steam.

Solution

Question 5

Reaction of methane with steam

Mixing natural hydrocarbons of high molecular weight

Elecrolysis of water

Reaction of salt like hydrides with water

Solution

Question 6

Reaction between $$Fe$$ and dil. $$HCl$$

Reaction between $$Zn$$ and conc. $$ H_{2}SO_{4} $$

Reaction between $$Zn$$ and $$NaOH$$

Electrolysis of $$NaCl$$ in Nelson's cell

Solution

Question 7

$$H_{2}C =CH_{2}$$

$$R-O-R$$

$$R-CH_{3}$$

$$R-OH$$

Solution

Question 8

oxidising agent

both oxidising and reducing agent

reducing agent

none of the above

Solution

Question 9

action of $$H_{2}SO_{4}$$ on barium peroxide

action of $$H_{2}SO_{4}$$ on sodium peroxide

electrolysis of $$50$$% $$H_2SO_4$$

burning hydrogen in excess of oxygen

Solution

Question 10

Feet per second or CFS

Liters

Cusesc

Feet

Solution

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