CIE Chemistry (US-0439): Specimen Questions with Answers 195 - 199 of 240

Question number: 195

MCQ▾

Question

A funnel is used to dissolve the collected ammonia into water because

Choices

Choice (4) Response

a.

All the others

b.

It increases the surface area

c.

It avoids back suction

d.

None of the above

Answer

a.

Explanation

Correct Option is A because A funnel is used to dissolve the collected ammonia into water because it increases the surface area and leads to proper dissolving of ammonia, as well as avoids back suction.

Question number: 196

Short Answer Question▾

Write in Short

  1. All metal nitrates decompose when heated. A few form a nitrite and oxygen. Most form the metal oxide, oxygen and a brown gas called nitrogen dioxide.

    1. (i) Name a metal whose nitrate decomposes to form the metal nitrite and oxygen.

Explanation

Lead

Question number: 197

MCQ▾

Question

ions combine with water to form

Choices

Choice (4) Response

a.

b.

c.

d.

Answer

c.

Explanation

Since ions are not stable, they form ions in their aqueous solution to gain stability. ion is known as Hydronium ion.

Thus H + ions combine with water to form ions.

Question number: 198

MCQ▾

Question

In Haber process, the catalyst used is

Choices

Choice (4) Response

a.

Platinum or palladium

b.

Iron or molybdenum

c.

Nickel only

d.

None of the above

Answer

b.

Explanation

In Haber process, the catalyst used is iron or molybdenum.

Question number: 199

MCQ▾

Question

is a:

Choices

Choice (4) Response

a.

Weak acid

b.

Weak base

c.

Strong base

d.

Strong acid

Answer

d.

Explanation

Strong acids completely ionise to produce a high concentration of ions.

being a strong acid, ionises completely to give and ions. As ion is unstable, so it combines with water to form ion.