Q. What is the role of positive catalyst in a chemical reaction?
1) It increase the rate of reaction
2) It decrease the rate of reaction
3) It increase the yield of the products
4) It provides better purity of the products
Q. Why hard water does not give lather with soap?
1) Hard water contains Ca and Mg ions which form precipitate with soap
2) Hard water contains sulphate and chloride ions which form precipiate
3) pH of hard water is high
4) pH of hard water is less
Q. Which of the following gases in the atmosphere is/are responsible for acid rains?
1. Oxides of sulphur
2. Oxides of nitrogen
3. Oxide of carbon
1) 1 and 2 only
2) 1 and 3 only
3) 2 only
4) 1,2 and 3 only
Q. The gas used in a refrigerator is-
1) Cooled down on flowing
2) Cooled down when compressed
3) Heated up on flowing
4) Cooled down when expanded
Q. Which one of the following processes of weathering belongs to both mechanical and chemical weathering?
1) Hydration
2) Exfoliation
3) Crystallisation
4) Carbonation
Q. The reaction that takes place in soap making is called saponification. Basically soap is sodium or potassium salts of
1) long chain monocarboxylic acids
2) long chain dicarboxylic acids
3) long chain tricarboxylic acids
4) glycerol
Q. The metal constituent of chlorophyll is
1) Potassium
2) Iron
3) Magnesium
4) Manganese
Q. During explosion of gunpowder, which of the following gases are evolved in the proportion of 1:3?
1) Nitrogen : Oxygen
2) Oxygen : Nirtogen
3) Nitrogen : Carbon dioxide
4) Carbon dioxide : Nitrogen
Q. The major component used in preparation of different types of glasses is
1) Sodium borate
2) Silica
3) Sodium silicate
4) Calcium silicate
Q. The main constituent of vinegar is
1) Citric acid
2) Ascorbic acid
3) Acetic acid
4) Tartaric acid
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