Hydrogen Test

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Hydrogen Test - 24

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Weekly Quiz Competition

Question 1
1 / -0

Hydrogen is the ________ element on the earth.

A
most abundant

B
heaviest

C
lightest

D
none of these

Solution

$$H$$ is the lightest element on earth as there is only $$1$$ proton and $${ 1e }^{ - }$$. All the other elements have more than 1 electrons and protons along with neutrons.
Question 2
1 / -0

$$2Na_2O_2 + \underset{cold}{ 2H_2O} \rightarrow$$ ______$$+H_2O_2$$

A
$$Na_2O$$

B
$$NaOH$$

C
$$NaO$$

D
none of these

Solution

Sodium peroxide reacts with water (cold) to produce sodium hydroxide and hydrogen peroxide.
Similarly, Sodium peroxide reacts with water (warm) to produce sodium hydroxide and oxygen.
So, answer should be (B).
Question 3
1 / -0

________ element has one electron in the outermost shell and attains duplet configuration after accepting one more electron and attains stability.

A
Helium

B
Hydrogen

C
Lithium

D
Carbon

Solution

Hydrogen has $${ 1e }^{ - }$$ in outermost shell, in order to achieve stability either $${ e }^{ - }$$ to be removed or added. When added it acquires a stable configuration forming duplet.
Question 4
1 / -0

As the rain water is the purest form of water, this can be used in lab due to:

A
presence of ions

B
absence of ions

C
good smell

D
easy availability

Solution

Rainwater is considered to the purest form of water. Impurities and salts present in the water on earth are left behind during vapourization by the sun.
This water can be used in labs due to the absence of ions. This water is similar to distilled water. Distilled water is used in Labs because of a little combination of impure water could affect the experiment.
Question 5
1 / -0

Silver reacts with hydro chloric acid to give ________.

A
$$AgCl$$

B
$$H_2$$

C
$$AgH$$

D
no reaction

Solution

Silver cannot replace $$H$$ from $$HCl$$ as it is placed at bottom of $$H$$ in reactivity series, hence less reactive then $$H$$.
Question 6
1 / -0

Water contains 88.89% of A by weight is decomposed into its elements B and oxygen. Pure C is a poor conductor of electricity and hence it is acidified using dilute sulphuric acid. When electric current is passed through acidulated water, using platinum electrones, hydrogen gas is evolved at cathode and oxygen gas is evolved at D.

What is 'C'?

A
Oxygen

B
Hydrogen

C
Water

D
Sulphuric acid

Solution

Percentage of oxygen in water

$$\displaystyle = \frac{weight\ of\ oxygen\ in\ water}{weight\ of\ water} \times 100$$

$$\displaystyle = \frac{16}{18} \times 100$$

$$=$$ 88.89%

Thus, water contains 88.89% of oxygen (A)

On decomposition of water we get hydrogen and oxygen.

So, B is hydrogen

Pure water is a poor conductor of electricity and when acidified by adding sulphuric acid it can conduct electricity hence, C is water.
Question 7
1 / -0

When hydrogen reacts with oxygen, oxygen is __________ is formed.

A
oxidized and water

B
reduced and water

C
reduced and ozone

D
none of these

Solution

$${ 2H }_{ 2 }+{ O }_{ 2 }\rightarrow { 2H }_{ 2 }O$$
Addition of hydrogen to any molecule/element is the reduction of the element.
When hydrogen is added with oxygen, it forms water.
Question 8
1 / -0

One of the methods for the manufacture of $$H_2O_2$$ involves the auto-oxidation of:

A
2- ehtylanthraquinol

B
hydrated barium peroxide

C
an alkali solution

D
50% $$H_2SO_4$$

Solution

Hydrogen peroxide can be obtained by the auto-oxidation of 2-ethyl anthraquinol.

2-Ethylanthraquinol $$\rightleftharpoons$$ oxidized product $$+\ H_2O_2$$

The reduced product is dissolved in a mixture of benzene and cyclohexanol and when air is passed through this, it is oxidised back to 2-Ethylanthraquinone and hydrogen peroxide is also produced along with.

This process is very cheap because 2-Ethylanthraquinone can be used again and again.
Question 9
1 / -0

Rogue element in the periodic table is______.

A
oxygen

B
hydrogen

C
astatine

D
rhenium

Solution

Rogue element in the periodic table is hydrogen, as its properties are similar with several groups. (alkali metals and halogens)
Question 10
1 / -0

In which property listed below hydrogen does not resemble alkali metals?

A
Tendency to form cation

B
Nature of oxide

C
Combination with halogens

D
Reducing character

Solution

Hydrogen shows all other properties like alkali metals (form cation, combine with halogens, reducing nature) but nature of oxide is different than metals because oxide of metals are basic in nature whereas oxide of Hydrogen are amphoteric in nature i.e. $$H_2O$$.
Option B is correct.

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Hydrogen Test - 24

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Hydrogen Test - 24

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Question 1

most abundant

heaviest

lightest

none of these

Solution

Question 2

$$Na_2O$$

$$NaOH$$

$$NaO$$

none of these

Solution

Question 3

Helium

Hydrogen

Lithium

Carbon

Solution

Question 4

presence of ions

absence of ions

good smell

easy availability

Solution

Question 5

$$AgCl$$

$$H_2$$

$$AgH$$

no reaction

Solution

Question 6

Oxygen

Hydrogen

Water

Sulphuric acid

Solution

Question 7

oxidized and water

reduced and water

reduced and ozone

none of these

Solution

Question 8

2- ehtylanthraquinol

hydrated barium peroxide

an alkali solution

50% $$H_2SO_4$$

Solution

Question 9

oxygen

hydrogen

astatine

rhenium

Solution

Question 10

Tendency to form cation

Nature of oxide

Combination with halogens

Reducing character

Solution

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