Q1. In which of the following industries is mica used as a raw material-
(a) Iron and steel
(c) Glass and pottery
Q2. Milk openly placed for some time becomes sour due to-
(a) Carbonic acid
(b) Lactic acid
(c) Citric acid
(d) Acetic acid
Q3. ‘Humus’ is an example of-
(a) Soil structure
(c) Organic colloids
(d) None of the above
Q4. Which of the following chemicals is used in foam fire extinguishers?
(a) Aluminium sulphate
(c) Cobalt sulphate
(d) Nickel sulphate
Q5. The predominant organic acid in grapes is-
(a) Formic acid
(b) Benzoic acid
(c) Lactic acid
(d) Tartaric acid
Q6. Which among the following elements has highest Electronegativity?
Q7. Which drug is used for Pain Relief?
(c) Folic Acid
Q8. Which of the following is a Synthetic rubber?
Q9. Which of the following is the main end product of carbohydrate digestion?
Q10. Which of the following is an Inert Gas?
S1. Ans. (d)
Sol. Mica is good conductor of heat and bad conductor of electricity so mica use in electrical industry.
Sol. Milk contains a sugar called lactose. It also contains harmless bacteria called lactobacillus, which uses glucose for energy and creates lactic acid as a by-product. It is the lactic acid which makes the milk sour. The presence of lactic acid or lactate in milk is due to the fermentation of lactose caused mainly by lactic bacteria.
Sol. Humus usually refers to the natural decay of material such as leaves in the soil’s top layer. It is a dark organic material that forms in the soil when plant and animal matter decays.
Sol. Aluminium sulphate is used in ‘foam’ fire extinguishers, which contains radium bicarbonate and aluminium sulphate in separate receptacles on being mixed they form the foam of bubbles of CO2.
Sol. Tartaric acid is the predominant organic acid in grapes.
Sol. Arsenic has highest electronegativity in the given elements.
Sol. Tramadol is used to treat moderate to moderately severe pain.
Sol. Neoprene is a family of synthetic rubbers that are produced by polymerization of chloroprene. Neoprene exhibits good chemical stability and maintains flexibility over a wide temperature range.
Sol. End products of digestion of carbohydrates are Glucose, fructose and galactose.
Sol. Noble Gases are all odorless, colorless, monatomic gases with very low chemical reactivity.The six noble gases that occur naturally are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and the radioactive radon (Rn).
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