CIE Chemistry (US-0439): Specimen Questions with Answers 223 - 227 of 240

Question number: 223

Short Answer Question▾

Write in Short

Complete the symbol equation for this reaction.

…….

Explanation

Question number: 224

MCQ▾

Question

The reactants for Haber process are:

Choices

Choice (4) Response

a.

molybdenum and nitrogen

b.

oxygen and nitrogen

c.

iron and nitrogen

d.

hydrogen and nitrogen

Answer

d.

Explanation

The reactants for Haber process are hydrogen and nitrogen. Under high pressure, in the presence of iron catalyst (molybdenum being the promoter), they react to form ammonia which is then collected by dissolving in water.

Question number: 225

Short Answer Question▾

Write in Short

State one use of aluminum other than as an electrical conductor.

…………………………………………………………………………………………………………………….

Explanation

Other than as electrical conductor aluminum is used as Aluminium is used in a huge variety of products including cans, foils, kitchen utensils, window frames, beer kegs and aeroplane parts.

Question number: 226

MCQ▾

Question

Water reacts with metallic oxide to give ________.

Choices

Choice (4) Response

a.

Neutral Product

b.

Water

c.

Acid

d.

Base

Answer

d.

Explanation

Water reacts with metallic oxide to give base.

For example, water reacts with potassium oxide to give potassium hydroxide .

Question number: 227

Short Answer Question▾

Write in Short

Classify each of the following as either an element, compound or mixture.

Copper (1 Marks)

Explanation

Copper is a chemical element with symbol Cu (from Latin: cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a reddish-orange color.