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Non-Metals and Their Compounds

312 MCQ questions with answers and explanations · page 7 of 13

Test yourself▶ 25 question test▶ 50 question test

Q151. The valency of phosphorus is-

  1. A2,3
  2. B3.4
  3. C4.5
  4. D3.5
Show answer & explanation

Answer: D) 3.5

Q152. The most stable allotrope of phosphorus is—

  1. AYellow Phosphorus
  2. BRed Phosphorus
  3. CPurple Phosphorus
  4. Dblack phosphorus
Show answer & explanation

Answer: B) Red Phosphorus

Q153. The most reactive form of phosphorus is—

  1. ARed Phosphorus
  2. BYellow or white phosphorus
  3. Cblack phosphorus
  4. DPurple Phosphorus
Show answer & explanation

Answer: B) Yellow or white phosphorus

Q154. Yellow phosphorus is stored in_

  1. Ain kerosene oil
  2. Bin water
  3. Cin petrol
  4. Din the air
Show answer & explanation

Answer: B) in water

Q155. Used in the manufacture of matchsticks_

  1. Awhite phosphorus
  2. BRed Phosphorus
  3. CSilicon
  4. DSelenium
Show answer & explanation

Answer: B) Red Phosphorus

Q156. Bones and teeth contain approximately 50% of ____.

  1. Acalcium phosphate
  2. Bcalcium silicate
  3. Ccalcium carbonate
  4. Dcalcium phosphorite
Show answer & explanation

Answer: A) calcium phosphate

Q157. Which of the allotropes of phosphorus shows the property of phosphorescence?

  1. Awhite phosphorus
  2. Bblack phosphorus
  3. CRed Phosphorus
  4. DSindoori Fondom
Show answer & explanation

Answer: A) white phosphorus

Q158. White phosphorus reacts with hot and concentrated solution of caustic soda (NaOH) to form—

  1. AForgene
  2. BPhosphine
  3. Cphosphoric acid
  4. Dphosphorus pentoxide
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Answer: B) Phosphine

Q159. The main constituent of human bone is ______.

  1. ACa
  2. BP
  3. CFe
  4. DZn
Show answer & explanation

Answer: B) P

Q160. Bird bone powder is used as fertilizer because it is rich in ____

  1. Afrom nitrogen
  2. Bfrom phosphorus
  3. Cfrom sodium
  4. Dfrom potassium
Show answer & explanation

Answer: B) from phosphorus

Q161. Which of the following is present on the head of a matchstick?

  1. Aglue and glass powder
  2. Bwhite phosphorus
  3. CAntimony trisulfide
  4. Dpotassium chlorate
Show answer & explanation

Answer: A) glue and glass powder

Q162. Select the correct answer from the codes given below_

  1. A1, 3 and 4
  2. B2.3 and 4
  3. C1, 2 and 3
  4. D1, 2, 3 and 4
Show answer & explanation

Answer: A) 1, 3 and 4

Q163. Which of the following is used to create a smoke screen in war?

  1. ApH²
  2. BPH⁴
  3. CPCI³
  4. DpH⁵
Show answer & explanation

Answer: A) pH²

Q164. What is the approximate percentage of oxygen in the air?

  1. A0.21
  2. B1
  3. C0.01
  4. D0.78
Show answer & explanation

Answer: D) 0.78

Q165. Identify the element which is found in the highest quantity in the outer layer of the Earth?

  1. Aoxygen
  2. BSilicon
  3. Chydrogen
  4. DIron
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Answer: A) oxygen

Q166. Which one of the following gases is not a greenhouse gas?

  1. ACO²
  2. BCH⁴
  3. CNO²
  4. DO²
Show answer & explanation

Answer: D) O²

Q167. Where does oxygen, the life-giving gas for humans, come from?

  1. Acarbon dioxide
  2. BWater
  3. COxides of metals
  4. Dcarbonates absorbed from the soil
Show answer & explanation

Answer: B) Water

Q168. What mixtures of gases do divers use for breathing?

  1. Aoxygen and nitrogen
  2. Boxygen and hydrogen
  3. Coxygen and helium
  4. Doxygen and argon
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Answer: C) oxygen and helium

Q169. Which of the following helps in burning?

  1. Aoxygen
  2. Bcarbon monoxide
  3. Cnitrogen
  4. Dcarbon dioxide
Show answer & explanation

Answer: A) oxygen

Q170. Oxygen used for artificial respiration in hospitals is ____

  1. Aoxygen and helium
  2. BNitrogen and Argon
  3. COxygen and Argon
  4. Doxygen and carbon dioxide
Show answer & explanation

Answer: A) oxygen and helium

Q171. When burning Santhi is taken in oxygen gas, it_

  1. AIt gets extinguished.
  2. BIt goes off and the gas starts burning.
  3. Cit ignites quickly
  4. DBoth it and the gas burn
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Answer: C) it ignites quickly

Q172. Which element has the highest percentage in the human body?

  1. Ahydrogen
  2. Bnitrogen
  3. CCarbon
  4. Doxygen
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Answer: D) oxygen

Q173. Oxygen and ozone are_

  1. AAsotros
  2. BIsotopes
  3. CIsomers
  4. Disobars
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Answer: A) Asotros

Q174. Which of the following gases forms an almond coloured solution when passed through an alkaline solution of pyrogale?

  1. Aoxygen
  2. Bnitrogen
  3. Chydrogen
  4. Dcarbon dioxide
Show answer & explanation

Answer: A) oxygen

Q175. Which of the following gases darkens the surface of silver?

  1. AOzone
  2. Bhydrogen
  3. Coxygen
  4. Dcarbon dioxide
Show answer & explanation

Answer: A) Ozone

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