Chemistry-Objective Related Question Answers
1226. The process of extraction of metals from their ores; and then refining them for use is known as?
metallurgy
1227. The main ore of aluminium is?
Bauxite
1228. The main ore of iron is?
Haematite
1229. The nucleus of an atom consists of?
protons and neutrons
1230. The number of moles of solute present in 1 kg of a solvent is called its?
molality
1231. The metal used to recover copper from a solution of copper sulphate is?
Fe
1232. The number of d-electrons in Fe2+ (Z = 26) is not equal to that of?
p-electrons in CI(Z = 17)
1233. The metallurgical process in which a metal is obtained in a fused state is called?
smelting
1234. The molecules of which gas have highest speed?
H2 at -73oC
1235. The oldest rocks in the earth's crust were once molten; and came from deep inside the earth. The molten rock; called magma; spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called?
igneous rocks
1236. The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is?
Henry's law
1237. The main buffer system of the human blood is?
H2CO3 - HCO3
1238. The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is?
ozone
1239. The most commonly used bleaching agent is?
chlorine
1240. The nucleus of a hydrogen atom consists of?
1 proton only
1241. The heat required to raise the temperature of body by 1 K is called?
thermal capacity
1242. The nuclear particles which are assumed to hold the nucleons together are?
mesons
1243. The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is?
3.05 gram
1244. The octane number of zero is assigned to?
n-heptane
1245. The metal that is used as a catalyst in the hydrogenation of oils is?
Ni
1246. The most abundant rare gas in the atmosphere is?
Ar
1247. The Latin word formica means ant. The name formic acid is derived from this Latin word because?
this acid was first obtained by the distillation of ants
1248. The inherited traits of an organism are controlled by?
DNA molecules
1249. The heat energy produced when the human body metabolises 1 gram of fat is?
39 KJ
1250. What are the number of moles of CO2 which contains 16 g of oxygen?
0.5 mole
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