Chemistry- Questions and Answers 08
226. Gunmetal is made from-tin and copper.
227. Cobalt is used in making-
rust-resistant alloys.
228. Steel is a form of iron. To make steel from iron, The carbon content is reduced from-
5% to 0.5 -1.5%)
229. The platinum metal occurs in its pure form in-
earth's crust
230. The first known superconductor is –
mercury.
231. Silver is the best conductor of –
heat and electricity.
232. Iodine is a-
solid non-metal
233. Iron is the-
first metal used by man
234. Metallic cofactor present in chlorophyll is-
magnesium.
235. Metallic cofactor present in haemoglobin is-
iron.
236. Metal abundant in seawater is-
Vanadium
237. The metal most abundant in the human body is-
calcium.
238. The element which is seen in the rocks of the moon:
(a) Titanium (b) Platinum
(c) Uranium (d) Nickel
Answer: (a)
239. Which element has the highest electropositivity?
(a) Francium (b) Caesium
(c) Florin (d) Chlorine
Answer: (a)
240. Cobalt ions give ...... colour to glass:
(a) Green (b) Red
(c) Blue (d) Purple
Answer: (c)
241. Which is not a constituent of Sugar?
(a) Nitrogen (b) Carbon
(c) Oxygen (d) Hydrogen
Answer: (a)
242. Which metal plays a key role in the synthesis of proteins?
(a) Sodium (b) Magnesium
(c) Calcium (d) Iron
Answer: (b)
243 Marsh Test determines the presence of:
(a) Sulphur (b) Arsenic
(c) Carbon (d) Sodium
Answer: (b)
244. Which of the following is a common constituent of Transistor?
(a) Beryllium (b) Iron
(c) Copper (d) Germanium
Answer: (d)
245. Frederic Wohler made urea from........
(a) Ammonium chloride (b) Ammonium Carbonate
(c) Ammonium Oxide (d) Ammonium cyanate
Answer: (d)
246. The catalyst used for the manufacture of Ammonia:
(a) Silver (b) Sodium Chloride
(c) Iron (d) Gold
Answer: (c)
247. Which one of the following is the result of the Green House Effect?
(a) Acid rain (b) Ozone depletion
(c) Air pollution (d) Global warming
Answer: (d)
248. The whitest substance:
(a) Topaz (b) Diamond
(c) Marble (d) Titanium dioxide
Answer: (d)
249. Which element has the second-highest capacity for oxidation?
(a) Iron (b) Oxygen
(c) Mercury (d) Oxygen
Answer: (d)
250. Dow process is used for the extraction of:
(a) Iron (b) Calcium
(c) Sodium (d) Magnesium
Answer: (d)
251. The second most ductile element:
(a) Copper (b) Iron
(c) Tungsten (d) Silver
Answer: (c)
252. Which metal is contained in Insulin?
(a) Zinc (b) Magnesium
(c) Lithium (d) Barium
Answer: (a)
253. The number of naturally occurring elements:
(a) 90 (b) 91
(c) 92 (d) 93
Answer: (c)
254. The number of periods in the periodic table:
(a) 5 (b) 7
(c) 18 (d) 9
Answer: (b)
255. The number of groups in the periodic table:
(a) 18 (b) 19
(c) 16 (d) 15
Answer: (a)
256. Number of blocks in the periodic table:
(a) 4 (b) 5
(c) 6 (d) 7
Answer: (a)
257. Alkaline earth metals belong to ......group.
(a) Fourth (b) Third
(c) Second (d) First
Answer: (c)
258. Alkali metals belong to ...... group.
(a) First (b) Third
(c) Fourth (d) Fifth
Answer: (a)
259. 13th group is called ........ group or Boron group:
(a) Aluminium (b) Nitrogen
(c) Oxygen (d) Halogen
Answer: (a)
260. 14th group is called ....... group:
(a) Carbon (b) Nitrogen
(c) Halogen (d) Oxygen
Answer: (a)
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