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MCQs 161-170
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In this chapter, Binati discusses 10 MCQs.

Binati Sheth
An Avid Reader. A Teacher. An Aid worker. An Engineer (E&C). A Writer. Budding Art Connoisseur. A philomath. A Shōnen Otaku.

U
Unacademy user
awesome work bro!
Nikhil Puranik
3 years ago
Thank you ☺
  1. Educator Writer Translator Hi am Bimati Sheth


  2. Rate Review veddn't lve it Recommend Share facebook twitter etC Insta am


  3. Generan Knowiedpe for XAT


  4. Oxalic acid is found in which of the following? (a) Amla (b)Tamarind (c) Lemon (d) Spinach 161


  5. Solution: d. Amla contains ascorbic acid, Tamarind contains tartaric acid and Lemon contains citric acid


  6. 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


  7. 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


  8. 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


  9. 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.


  10. 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


  11. 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.


  12. Which of the following has the lowest melting point? (a) Thallium (b) Sodium (c) Caesium (d) Germanium 166


  13. Solution: a. Diamond, an allotrope of carbon, is the hardest known natural substance.


  14. 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.


  15. 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


  16. 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