Chemistry Test 136

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Chemistry Test 136

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Weekly Quiz Competition

Question 1
4 / -1

Coal gas is a mixture of

A

B

C
saturated and unsaturated hydrocarbons

D

Solution

Coal gas contains a variety of calorific gases including hydrogen, carbon monoxide, methane, ethylene and volatile hydrocarbons together with small quantities of non-calorific gases such as carbon dioxide and nitrogen.
Question 2
4 / -1

Formic acid (HCOOH) on heating with concentrated H₂SO₄ gives

A

B

C

D

Solution

H₂SO₄ + HCOOH → CO + H₂SO₄•H₂O.

Sulfuric acid react with formic acid to produce carbon monoxide and hydrate sulfuric acid.
Question 3
4 / -1

Which of the following gases is used for the purification of nickel ?

A
CO₂

B
N₂

C
NO

D
CO

Solution

CO is the gas used for purification of nickel and this process is called Mond process.
Question 4
4 / -1

The most stable oxidation state of boron is

A
1

B
-3

C
3

D
5

Solution

The elments of the boron family adopts oxidation states +3 or +1. The +3 oxidation states are favorable except for the heavier elements, such as Tl, which prefer the +1 oxidation state due to its stability; this is known as the inert pair effect.
Question 5
4 / -1

Which of the following products are formed when boron is fused with NaOH ?

A

B

C

D

Solution

Boron reacts with fused sodium hydroxide to form sodium borate and hydrogen.

B + 6NaOH →→ 2Na₃BO₃ + 3H₂
Question 6
4 / -1

When borax is dissolved in water,

A

B

C

D
Question 7
4 / -1

B₂H₆ reacts with Cl₂ to produce

A

B

C

D

Solution

B₂H₆ + 6Cl₂ → 2BCl₃ + 6HCl

Diborane react with chlorine to produce boron(III) chloride and hydrogen chloride...
Question 8
4 / -1

In the Serepeck process, the bauxite ore is treated with

A

B
NaOH

C

D

Solution

Serpeck process is a method of purification of Bauxite ore containing silica (SiO₂) as the main impurity.

The reaction involved are-

Al₂O₃.2H₂O+3C+N₂⟶2AlN+3CO+2H₂O

2AlN+6H₂O⟶2NH₃+Al(OH)₃
Question 9
4 / -1

Anhydrous AlCl₃ produces fumes in the air because of

A
dimerization

B
hydrolysis

C
oxidation

D
dissociation

Solution

Anhydrous aluminium chloride is hydrolised partly with the moisture in the atmosphere to give HCl gas. This HCl gets combine to moisture in air giving white fumes. So white fumes appear by hydrolysis.
Question 10
4 / -1

Alzeimer’s diseases is caused by the depostion of

A
Cu,Fe and Al salts in the brain

B
Zn and Al salts in the brain

C
Mg and Al salts in the brain

D
Al salts in the brain