Chemistry- Questions and Answers 06
161. The permanent hardness of water can be removed by adding —Answer: Washing Soda
162. The alcohol used in power alcohol is
Answer: ethyl alcohol
163. The cell membrane is–
Answer: semipermeable
164. The chemical used as a fixer in photography is
Answer: sodium thiosulphate
165. Which of the following substance is a bad conductor of electricity but a good conductor of heat?
Answer: Mica
166. Polythene is industrially prepared by the polymerisation of–
Answer: ethylene
167. The shell of the egg is made of –
Calcium Carbonate.
168. Talc is basic –
magnesium silicate mineral
169. The highest and simplest element is hydrogen while the lightest metal is-
Lithium
170. Temporary hardness of water is due to the bicarbonates of calcium and magnesium. It can be removed by –
boiling or adding lime
171. Sodium is stored in Kerosene to prevent-
oxidation.
172. Permanent hardness is due to the presence of sulphates and chlorides of calcium and magnesium. It can be removed by –
Adding washing soda or by distillation
173. NPK mixtures are fertilizers with the mixtures of –
nitrogen, phosphorous and potassium.
174. The gas responsible for the Bhopal Gas Tragedy is –
Methyl Isocyanate (MIC)
175. CO2 is used as-
fire extinguishers.
176.Thorium is extracted from –
monozite sand.
177. Red phosphorus is used in :
Making matches
178. In a dry cell, zinc and carbon act as-
electrodes.
179. Chlorine is used as a-
bleaching agent.
180. Lead pencils contain –
graphite.
181. White phosphorus is a –
strong poison.
182. Carborundum is used as an abrasive for-
cutting and grinding glasses.
183. Silver iodide is used to make –
artificial rain.
184. Zinc oxide is called the-
'flower of Zinc"
185. Water is called –
'Universal Solvent"
186. The gas used in refrigerators is-
ammonia.
187. The lightest substance known is Hydrogen and the heaviest is –
Osmium.
188. Con. Nitric acid is used to-
purify gold.
189. A mixture of salt and ice gives a temperature below 0°c which is called Antifreeze. It is used to –
breakdown ice mixtures in the radiators of cars in cold countries.
190. Neoprene is a synthetic rubber used as insulators in-
Electric cables.
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