Science Practice Quiz 23

Q1.Which compound is used as one of the raw materials for producing baking soda?

A. Ammonium chloride B. Sodium carbonate C. Sodium chloride D. Calcium carbonate

Q2.Which of the following is NOT a stated use of sodium carbonate (washing soda) according to the provided text?

A. Used in glass, soap, and paper industries B. Used in the manufacture of sodium compounds such as borax C. Used as a cleaning agent for domestic purposes D. Used for sterilizing medical equipment

Q3.What is 'water of crystallisation'?

A. Water absorbed by a salt from the atmosphere B. Water molecules loosely attached to the surface of a salt C. The fixed number of water molecules present in one formula unit of a salt D. Water used to dissolve salts for industrial processes

Q4.What happens to copper sulphate crystals when they are heated?

A. They turn blue B. They turn white C. They melt into a liquid D. They become insoluble in water

Q5.How many water molecules of crystallisation are present in one formula unit of copper sulphate?

A. Two B. Five C. Ten D. One

Q6.The chemical formula Na2CO3.10H2O indicates that sodium carbonate contains how many water molecules of crystallisation?

A. Two B. Five C. Ten D. One

Q7.What is the chemical formula for gypsum?

A. CaSO4.1/2H2O B. CaSO4.2H2O C. CaCO3.2H2O D. Ca(OH)2.2H2O

Q8.What is the chemical formula for Plaster of Paris?

A. CaSO4.2H2O B. CaSO4.1/2H2O C. CaSO4.H2O D. CaSO4.5H2O

Q9.Which scale is used to measure the strength of an acid or an alkali, and what is its typical range?

A. Litmus scale (0-7) B. pH scale (0-14) C. Universal indicator scale (1-10) D. Acidity scale (7-14)

Q10.According to the pH scale, what is the characteristic pH of a basic solution?

A. Exactly 7 B. Less than 7 C. More than 7 D. Between 0 and 7

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Science Practice Quiz 23