Chemistry-Objective Related Question Answers
251. The process of conversion of substance directly from solid to vapour state?
Sublimation
252. The process of changing of gas into liquid is known as?
Condensation
253. Process of heating milk to 72°C about 16 seconds and then cooling it to 4°C to destroy harmful bacteria is known as?
Pasteurization
254. Most effective method to separate a mixture of coloured compounds is?
Chromatography
255. A mixture of two elements; one of which is a metal is called?
Alloy
256. The alloy used for making the parts of aero planes?
Duralumin
257. First alloy used by man?
Bronze
258. The alloy used for filling the cavity of the teeth?
Silver amalgam & Mercury amalgam
259. The alloy used for making the parts of engines?
Silumin
260. The alloy used for making the Oscar statuette?
Britannium
261. The alloy used for making pendulum?
Invar
262. The alloy used for making spring?
Chrome Steel
263. The alloy used for making bells?
Bronze (Bell metal)
264. The alloy used for making hornpipes?
Brass
265. First element in the periodic table?
Hydrogen
266. Hydrogen was discovered by?
Henry Cavendish
267. The name Hydrogen was given by?
Lavoisier
268. Colour of Pure Hydrogen is?
Colourless
269. The gas having lowest density?
Hydrogen
270. The lightest element?
Hydrogen
271. Simplest atom (based on atomic mass) is that of?
Hydrogen
272. The element which is not included in any group?
Hydrogen
273. The element used as a rocket fuel?
Liquid Hydrogen
274. The colour of Hydrogen when it burns?
Blue
275. High boiling point of water is due to?
Hydrogen bonding
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