Chemistry-Objective Related Question Answers
1251. The main use of salt in the diet is to?
produce in small amounts the hydrochloric acid required for the digestion of food
1252. The monomer of polythene is?
ethylene
1253. The luster of a metal is due to?
presence of free electrons
1254. The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is?
6.023 x 1019
1255. The most malleable metal is?
gold
1256. The oil used in the froth floatation process is?
pine oil
1257. The number of waves in n x 10th Bohr's orbit are?
n
1258. The mass of one Avogadro number of helium atom is?
4.00 gram
1259. The items amenable to detection by soft x-rays are?
genuine coins from counterfeit coins
1260. The material which can be deformed permanently by heat and pressure is called a?
thermoset
1261. The mass number of a nucleus is?
the sum of the number of protons and neutrons present in the nucleus
1262. The inexpensive and commonly used variety of glass is called soda glass. It is called so because?
is made using soda(sodium carbonate)
1263. The gas used in the manufacture of vanaspati from vegetable oil is?
hydrogen
1264. The ionic radii of N3-; O2-; F- and Na+ follows the order?
N3- > O2- > F- > Na+
1265. The graphite rods in the nuclear reactor?
convert fast moving neutrons into thermal neutrons
1266. The first metal used by man was?
copper
1267. The hydronium ion is?
H3O+
1268. The method that cannot be used for removing permanent hardness of water is?
boiling
1269. The gas used for artificial ripening of green fruit is?
ethylene
1270. Zone refining is used for the purification of?
Ge
1271. The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is?
cineole
1272. he high reactivity of fluorine is due to?
its high electro negativity
1273. The iron ore magnetite consists of?
Fe2O3
1274. The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is?
5x/36
1275. The major constituent of air is?
nitrogen
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