Science Practice Quiz 21

Q1.Salts having the same positive or negative radicals are said to belong to a family. Which of the following pairs of salts belongs to the family of chloride salts?

A. NaCl and Na2SO4 B. NaCl and KCl C. Na2SO4 and K2SO4 D. KNO3 and NaNO3

Q2.Salts formed from a strong acid and a weak base are characterized by which of the following properties?

A. Neutral with pH value of 7 B. Acidic with pH value less than 7 C. Basic with pH value more than 7 D. Always insoluble in water

Q3.What is the nature and pH value of salts formed from a strong base and a weak acid?

A. Acidic, pH less than 7 B. Neutral, pH of 7 C. Basic, pH more than 7 D. Highly acidic, pH of 1

Q4.Which two substances combine to form sodium chloride, according to the provided text?

A. Nitric acid and potassium hydroxide B. Sulphuric acid and calcium hydroxide C. Hydrochloric acid and sodium hydroxide solution D. Carbonic acid and ammonium hydroxide

Q5.Based on the text, which of the following statements accurately describes sodium chloride?

A. It is an acidic salt with pH less than 7. B. It is a basic salt with pH more than 7. C. It is a neutral salt. D. It is primarily used as a fertilizer.

Q6.How is rock salt described in the given text?

A. A chemically pure form of sodium chloride found in liquid state. B. Large crystals of solid salt, often brown due to impurities, formed when ancient seas dried up. C. Salt obtained directly from modern seawater evaporation ponds. D. A synthetic salt produced in laboratories for industrial use.

Q7.How is sodium chloride obtained from seawater?

A. It is synthesized chemically from other elements. B. It is separated from other salts dissolved in seawater. C. It is extracted from underground mines only. D. It is formed by the reaction of strong acids and bases in seawater.

Q8.In the chlor-alkali process, which gas is produced at the anode?

A. Hydrogen gas B. Oxygen gas C. Chlorine gas D. Sodium gas

Q9.During the chlor-alkali process, where is sodium hydroxide solution formed?

A. Near the anode B. Near the cathode C. In the middle of the cell D. At both anode and cathode

Q10.Bleaching powder is manufactured by the action of chlorine gas on which of the following substances?

A. Dry slaked lime B. Aqueous sodium chloride C. Common salt D. Sodium hydroxide

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Science Practice Quiz 21