IGCSE Chemistry: Specimen Questions with Answers 58 - 60 of 240

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Question 58

Write in Short

Short Answer▾

Malonic acid reacts with ethanol to form a colorless liquid which has a ‘fruity’ smell. Its structural formula is given below.

‘Fruity’ Smell

What type of compound contains the group which is circled?

[1 Marks]

Explanation

Carbonyl: A carbon-oxygen double bond. The carbon atom has two bonds left over that can be attached to other atoms.

Question 59

Question

MCQ▾

Under what conditions does Gay-Lussac՚s Law stand?

Choices

Choice (4)

a.

Under constant temperature and pressure

b.

Under constant pressure

c.

Under constant temperature

d.

Question does not provide sufficient data or is vague

Answer

a.

Explanation

Gay Lussac՚s Law standsunder constant temperature and pressure.

Question 60

Question

MCQ▾

What is the balanced chemical equation for the reaction between calcium and water?

Choices

Choice (4)

a.

Ca + H2O ⇾ CaOH + H2

b.

Ca + H2O ⇾ CaOH2 + H2

c.

Ca + 2H2O ⇾ CaOH + H2

d.

Ca + 2H2O ⇾ CaOH2 + H2

Answer

d.

Explanation

Correct option is D because when calcium react with water then it forms calcium hydroxide and hydrogen gas. So in option D calcium is balanced hydrogen is balanced as well as oxygen is also balanced.

As shown in figure.

Balanced Chemical Equation

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