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Generan Knowiedpe for XAT
Oxalic acid is found in which of the following? (a) Amla (b)Tamarind (c) Lemon (d) Spinach 161
Solution: d. Amla contains ascorbic acid, Tamarind contains tartaric acid and Lemon contains citric acid
Which acid does an ant injects into the skin, when it bites? (a) Ascorbic Acid (b) Tartaric Acid C) Formic d) Hyd rochloric Acl d 162
Solution: c. Formic acid is widely used in the chemical industries and in dyeing and tanning. In nature, formic acid occurs in the poisons of stinging ants and other insects and in stinging nettles
Consider the following statements I.A green pigment in plant leaves called chlorophyll helps to capture the energy of the sunlight. II. Plants obtain nitrogen, to make proteins, from air through leaves. Which of the above statements is/are correct? (a) I (b) II 163 (c) I and II (d) none
Solution: a. The green pigment in plant leaves called chlorophyll helps plant leaves to capture the energy of the sunlight for photosynthesis. Soil has bacteria that convert gaseous nitrogen into a usable form and release it into the soil. These are absorbed by the plants along with water.
Consider the following statements When the soil is too acidic, organic matter is added to it to neutralise it. II. A turmeric stain turns red when treated with a base. Which of the above statements is/are correct? (b) II eI and I d) none 164
Solution: b. Organic matter releases acids. If the soil is too acidic, it can be neutralised by adding bases like quick lime (calciunm oxide). Turmeric is a good naturally occurring indicator which turns red when treated with a base.
Which of the following has the lowest melting point? (a) Thallium (b) Sodium (c) Caesium (d) Germanium 166
Solution: a. Diamond, an allotrope of carbon, is the hardest known natural substance.
Solution: b. Ductility is the property of a metal or any other material that allows it to be drawn into wires. Gold is the most ductile metal.
Which of the following metals is kept in kerosine oil to prevent it from burning at room temperature? (a) Barium (b) Indium (c) Potassium (d) Bismuth 169
Solution: c. Alkali metals such as potassium and sodium are so highly reactive that they catch fire if kept in the open. Hence, to protect them from catching fire, they are kept immersed in kerosene oil
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