Hydrogen Test

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Hydrogen Test - 30

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Weekly Quiz Competition

Question 1
1 / -0

Specific heat of water is:

A
very low

B
medium

C
sometimes high and sometimes low

D
none of the above

Solution

$$\bf{Hint:}$$ Specific heat is determined experimentally and has a fixed value.

$$\bf{Explanation:}$$

The quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree is known as specific heat.

The specific heat of water is $$=4.186$$ $$J/g^{o}C$$.
Water is very resistant to change in temperature, while metals do not resistant as they are good conductors of heat and electricity.
So the specific heat of water is higher than other metals.

$$\bf{Final \ answer:}$$ Option $$D$$
Question 2
1 / -0

The melting point of ice is:

A
$$0^oC$$

B
$$37^oC$$

C
$$4^oC$$

D
$$100^oC$$

Solution

Melting point of solid is defined as the temperature at which solid changes into liquid.
Melting point of ice is $$0^oC$$
Question 3
1 / -0

Why does $$H^+$$ always get associated with other atoms or molecules?

A
Ionisation enthalpy of hydrogen resembles that of alkali metals.

B
Its reactivity is similar to halogens.

C
It resembles both alkali metals and halogens.

D
Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to small size it cannot exist freely.

Solution

Hydrogen has one electron in its s orbital and it can lose its electron like alkali metals which are highly electropositive in nature for their tendency to lose single electron from its outer shell. So hydrogen is similar to alkali metals.Positive hydride ions react with oxides and hydroxides to form water and with carbonates to form water and carbon dioxide.
Question 4
1 / -0

Hydrogen resembles alkali metals in many respect for which several factors are responsible. Of the following factors which one is the most important in this respect?

A
Its tendency to lose electron

B
Its tendency to gain electron in its valence shell

C
It has high ionisation enthalpy.

D
ts small size

Solution

Hydrogen has one electron in its s orbital and it can lose its electron like alkali metals which are highly electropositive in nature for their tendency to lose single electron from its outer shell. So hydrogen is similar to alkali metals.
Question 5
1 / -0

Hydrogen resembles halogen in many respects for which several factors are responsible. Of the following factors which one is the most important in this respect?

A
Its tendency to lose electron

B
Its tendency to gain electron in its valence shell

C
Its low negative electron gain enthalpy

D
Its small size

Solution

Halogens like hydrogen are highly electronegative in nature as it has the tendency to form anion by the gain of one electron in its valence shell. Similarly hydrogen has one electron in its only s-orbital which can accommodate only one electron to form hydride anion like halogens.
Question 6
1 / -0

Hydrogen differs from elements of $$I-A$$ group as:

A
it can form ionic as well as covalent bond

B
all are metals

C
$$ H^+$$ is unstable in water

D
both $$A$$ and $$B$$

Solution

The options A and B are the correct answers.
Hydrogen differs from elements of $$I-A$$ group as:
(A) hydrogen can form ionic as well as covalent bond whereas elements of $$I-A$$ group can form only ionic bonds.
(B) All elements of $$I-A$$ group are metals. Hydrogen (with very high ionization energy does not possess metallic character).
(C) $$H^+$$ ion is stable in water.
Question 7
1 / -0

The usual valency of hydrogen is:

A
$$-2$$

B
$$0$$

C
$$+1 $$ or sometimes $$-1$$

D
$$+2$$

Solution

The electronic configuration of hydrogen is $${ 1s }^{ 1 }$$ as it has only one electron in its single orbital. So, it can gain one or lose one electron from its s orbital, thereby, showing $$+1$$ or $$-1$$ valency.
Question 8
1 / -0

Among I-A elements, which element is gas at room temperature?

A
Hydrogen

B
Lithium

C
Sodium

D
Potassium

Solution

At standard temperature and pressure, hydrogen is a colorless, odorless, tasteless, non-toxic, non-metallic, highly combustible diatomic gas. It is highly flammable and forms an explosive mixture with air.
Question 9
1 / -0

Hydrogen resembles IV-A elements in what respect?

A
All are metals.

B
All are non metals.

C
All are metalloid.

D
They have half-filled electronic configuration.

Solution

IV A group has half filled valence shell like carbon or silicon and it shares it with the hydrogen singly filled s orbital. They resemble have comparable I.P. and E.A.
Question 10
1 / -0

Among I-A elements which can form ionic as well as covalent bonds?

A
Hydrogen

B
Cerium

C
Helium

D
Sodium

Solution

Hydrogen is the lightest element on the periodic table. Hydrogen forms covalent compounds with non metals. In ionic compounds hydrogen can take the form of negative charge when it is known as hydride or a cation.

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Hydrogen Test - 30

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Hydrogen Test - 30

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Question 1

very low

medium

sometimes high and sometimes low

none of the above

Solution

Question 2

$$0^oC$$

$$37^oC$$

$$4^oC$$

$$100^oC$$

Solution

Question 3

Ionisation enthalpy of hydrogen resembles that of alkali metals.

Its reactivity is similar to halogens.

It resembles both alkali metals and halogens.

Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to small size it cannot exist freely.

Solution

Question 4

Its tendency to lose electron

Its tendency to gain electron in its valence shell

It has high ionisation enthalpy.

ts small size

Solution

Question 5

Its tendency to lose electron

Its tendency to gain electron in its valence shell

Its low negative electron gain enthalpy

Its small size

Solution

Question 6

it can form ionic as well as covalent bond

all are metals

$$ H^+$$ is unstable in water

both $$A$$ and $$B$$

Solution

Question 7

$$-2$$

$$0$$

$$+1 $$ or sometimes $$-1$$

$$+2$$

Solution

Question 8

Hydrogen

Lithium

Sodium

Potassium

Solution

Question 9

All are metals.

All are non metals.

All are metalloid.

They have half-filled electronic configuration.

Solution

Question 10

Hydrogen

Cerium

Helium

Sodium

Solution

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