IGCSE Chemistry: Specimen Questions with Answers 194 - 197 of 240

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Question 194

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Short Answer▾

Which physical property is used to distinguish between metals and non-metals? It is possessed by all metals but by only one non-metal.

Explanation

Boiling point is the physical property.

Tungsten (metal) selenium (non-metal) are the elements with highest boiling point. .

Question 195

Question

MCQ▾

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

Choices

Choice (4)

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 196

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Short Answer▾
  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 197

Question

MCQ▾

ions combine with water to form

Choices

Choice (4)

a.

b.

c.

d.

Answer

b.

Explanation

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

Thus ions combine with water to form ions.

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