CIE Chemistry Paper-1: Specimen Questions 11 - 13 of 99

Question number: 11

MCQ▾

Question

X is a monatomic gas. Which statement about gas X is correct?

Choices

Choice (4) Response
a.

X is unreactive.

b.

X is coloured.

c.

X will displace iodine from potassium iodide.

d. X burns in air.

Answer

a.

Explanation

monatomic is a combination of the words “mono” and “atomic, ” and means “single atom. ” It is usually applied to gases: a monatomic gas is one in which atoms are not bound to each other. he noble gases are unreactive because they have a full valence shell of electrons and since they are unreactive and with a full outer shell. They don’t need to bond to themselves to fill the shell and are able to exist monoatomically.

Question number: 12

MCQ▾

Question

The diagram shows reactions of substance Y. Find Y.

Identifying the substance Y

Identifying the substance Y

What is substance Y in the figure

Choices

Choice (4) Response
a.

an alcohol

b.

a metal

c.

a catalyst

d.

a base

Answer

d.

Explanation

The chemical properties of alkali (soluble bases) states that Alkali react with Ammonium Salts to produce Ammonia Gas when heated gently

Alkali + Ammonium Salt – > Salt + Ammonia Gas + Water [Heat gently]

Also a neutralisation reaction takes place when alkalis are heated with dilute acid

Dilute Acid + Alkali – > Salt + Water

Question number: 13

MCQ▾

Question

A solution contains barium ions and silver ions and one type of anion. What could the anion be?

Choices

Choice (4) Response
a.

sulphate only

b.

chloride or nitrate or sulphate

c.

chloride only

d.

nitrate only

Answer

d.

Explanation

Any solution that contains both barium and sulphate ions would precipitate barium sulphate, or BaSO4. That’s because barium sulphate isn’t water-soluble.

Any solution that contains both silver ions and chloride ions would precipitate silver chloride, or AgCl. Like barium sulphate, silver chloride isn’t water-soluble. But ALL nitrates are soluble, including Ba (NO3) 2 and AgNO3. Nothing would precipitate from a solution that contained barium, silver, and nitrate ions.

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