Hydrogen Test

Result

Hydrogen Test - 23

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Which halogen reacts only partially with hydrogen even at high temperature and in the presence of a catalyst?

A
$$\mathrm{F}_{2}$$

B
$$\mathrm{Cl}_{2}$$

C
$$\mathrm{B}\mathrm{r}_{2}$$

D
$$\mathrm{I}_{2}$$

Solution

Reactivity order of halogens:
$$F_{2}>Cl_{2}>Br_{2}>I_{2}$$
There is small difference in electronegativity of hydrogen and iodine. So, it does not readily react with hydrogen whereas other halogens do.
Question 2
1 / -0

The stability of hydrogen halides is in the order of:

A
$$HF>HI>HBr>HCl$$

B
$$HI>HBr>HCl>HF$$

C
$$HF>HCl>HBr>HI$$

D
$$HCl>HBr>HI>HF$$

Solution

Due to large difference in electronegativity of upper halogens and hydrogen, they are more stable than lower hydrogen halide.

$$\therefore $$ Stability order: $$HF>HCl>HBr>HI$$.

Hence, option C is correct.
Question 3
1 / -0

Which of the following is a reducing agent and undergoes hydrolysis?

A
$$CH_{4}$$

B
$$C_{2}H_{6}$$

C
$$C_{3}H_{8}$$

D
$$SiH_{4}$$

Solution

Carbon compounds are unable to undergo hydrolysis due to absence of $$d$$ orbitals. However, $$Si$$ compounds can easily undergo hydrolysis due to the same fact that it has vacant d orbitals.
Question 4
1 / -0

Boiling point is least for:

A
$$HF$$

B
$$HCl$$

C
$$HBr$$

D
$$HI$$

Solution

Correct Answer: Option B
Explanation:
Among the hydrogen halides, $$HI$$ is ionic while $$HCl$$, $$HBr$$ and $$HF$$ are covalent.
The boiling points of ionic compounds are higher than that of covalent compounds.
The boiling point of covalent compounds is proportional to their molecular mass.
But in $$HF$$, there is intermolecular hydrogen bonding. So $$HF$$ has a higher boiling point than $$HCl$$.
Hence, the boiling point of $$HCl$$ is the lowest.
Question 5
1 / -0

Bleaching action of chlorine occurs in the presence of :

A
oxygen

B
moisture

C
dry air

D
sunlight

Solution

$$Cl_{2}+\underset{(H_{2}O)}{\text{moisture}} \rightarrow HCl+HClO$$
Bleaching action of chlorine is due to $$HClO$$ and therefore, $$Cl_{2}$$ needs moisture for its bleaching action.
Question 6
1 / -0

Which of the following is not used for disinfection of drinking water?

A
Chlorine

B
Phenyl

C
Chloramine

D
Ozone

Solution

For chemical disinfection a water following disinfectant are used: Chlorine , Chlorine dioxide, Hypochlorite, Ozone , Halogen etc. Chlorine chemicals are very effective against bacteria, viruses and fungi that contaminate water.
Question 7
1 / -0

Water containing heavier isotope of oxygen is know as _______water.

A
hard

B
soft

C
heavy

D
light

Solution
Question 8
1 / -0

The molecular weight of heavy water is _________ than ordinary water.

A
lower

B
higher

C
same

D
none of the above

Solution

The molecular weight of heavy water is higher than ordinary water.
In a molecule of heavy water, the hydrogen atoms are isotopes in which the nuclei of each contain a proton and a neutron, and hence are twice as heavy as normal hydrogen atom.
Question 9
1 / -0

Hydrogen gas is liberated by the action of aluminium with a concentrated solution of _________.

A
$$NaHCO_3$$

B
$$Na_2CO_3$$

C
$$NaOH$$

D
none of these

Solution

$$2Al+2NaOH+2{ H }_{ 2 }O\rightarrow 2NaAl{ O }_{ 2 }+3{ H }_{ 2 }$$
This reaction is extremely quick and produces a lot of energy.
This reaction occurs because $$Al$$ is always covered by a layer of un-reactive $${ Al }_{ 2 }{ O }_{ 3 }$$ layer has to be taken down first.
Question 10
1 / -0

Which of the following given element has one electron, one proton and no neutron?

A
$$H$$

B
$$Li$$

C
$$Cl$$

D
$$He$$

Solution

The atomic number of Hydrogen is $$(Z)$$ = 1 and it's mass number $$(A)$$ is $$1$$.

Therefore, number of neutrons $$= A-Z = 0$$. Hence, it is represented by $$_{1}{H}^1$$.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Hydrogen Test - 23

Result

Hydrogen Test - 23

Score

-

Rank

-

SHARING IS CARING

Question 1

$$\mathrm{F}_{2}$$

$$\mathrm{Cl}_{2}$$

$$\mathrm{B}\mathrm{r}_{2}$$

$$\mathrm{I}_{2}$$

Solution

Question 2

$$HF>HI>HBr>HCl$$

$$HI>HBr>HCl>HF$$

$$HF>HCl>HBr>HI$$

$$HCl>HBr>HI>HF$$

Solution

Question 3

$$CH_{4}$$

$$C_{2}H_{6}$$

$$C_{3}H_{8}$$

$$SiH_{4}$$

Solution

Question 4

$$HF$$

$$HCl$$

$$HBr$$

$$HI$$

Solution

Question 5

oxygen

moisture

dry air

sunlight

Solution

Question 6

Chlorine

Phenyl

Chloramine

Ozone

Solution

Question 7

hard

soft

heavy

light

Solution

Question 8

lower

higher

same

none of the above

Solution

Question 9

$$NaHCO_3$$

$$Na_2CO_3$$

$$NaOH$$

none of these

Solution

Question 10

$$H$$

$$Li$$

$$Cl$$

$$He$$

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.