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You Are On Question Answer Bank SET 2226

111301. The main ore of aluminium is?

Answer: Bauxite

111302. The main ore of iron is?

Answer: Haematite

111303. The nucleus of an atom consists of?

Answer: protons and neutrons

111304. The number of moles of solute present in 1 kg of a solvent is called its?

Answer: molality

111305. The metal used to recover copper from a solution of copper sulphate is?

Answer: Fe

111306. The number of d-electrons in Fe2+ (Z = 26) is not equal to that of?

Answer: p-electrons in CI(Z = 17)

111307. The metallurgical process in which a metal is obtained in a fused state is called?

Answer: smelting

111308. The molecules of which gas have highest speed?

Answer: H2 at -73oC

111309. 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?

Answer: igneous rocks

111310. The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is?

Answer: Henry's law

111311. The main buffer system of the human blood is?

Answer: H2CO3 - HCO3

111312. 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?

Answer: ozone

111313. The most commonly used bleaching agent is?

Answer: chlorine

111314. The nucleus of a hydrogen atom consists of?

Answer: 1 proton only

111315. The heat required to raise the temperature of body by 1 K is called?

Answer: thermal capacity

111316. The nuclear particles which are assumed to hold the nucleons together are?

Answer: mesons

111317. The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is?

Answer: 3.05 gram

111318. The octane number of zero is assigned to?

Answer: n-heptane

111319. The metal that is used as a catalyst in the hydrogenation of oils is?

Answer: Ni

111320. The most abundant rare gas in the atmosphere is?

Answer: Ar

111321. The Latin word formica means ant. The name formic acid is derived from this Latin word because?

Answer: this acid was first obtained by the distillation of ants

111322. The inherited traits of an organism are controlled by?

Answer: DNA molecules

111323. The heat energy produced when the human body metabolises 1 gram of fat is?

Answer: 39 KJ

111324. What are the number of moles of CO2 which contains 16 g of oxygen?

Answer: 0.5 mole

111325. The main use of salt in the diet is to?

Answer: produce in small amounts the hydrochloric acid required for the digestion of food

111326. The monomer of polythene is?

Answer: ethylene

111327. The luster of a metal is due to?

Answer: presence of free electrons

111328. The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is?

Answer: 6.023 x 1019

111329. The most malleable metal is?

Answer: gold

111330. The oil used in the froth floatation process is?

Answer: pine oil

111331. The number of waves in n x 10th Bohr's orbit are?

Answer: n

111332. The mass of one Avogadro number of helium atom is?

Answer: 4.00 gram

111333. The items amenable to detection by soft x-rays are?

Answer: genuine coins from counterfeit coins

111334. The material which can be deformed permanently by heat and pressure is called a?

Answer: thermoset

111335. The mass number of a nucleus is?

Answer: the sum of the number of protons and neutrons present in the nucleus

111336. The inexpensive and commonly used variety of glass is called soda glass. It is called so because?

Answer: is made using soda(sodium carbonate)

111337. The gas used in the manufacture of vanaspati from vegetable oil is?

Answer: hydrogen

111338. The ionic radii of N3-; O2-; F- and Na+ follows the order?

Answer: N3- > O2- > F- > Na+

111339. The graphite rods in the nuclear reactor?

Answer: convert fast moving neutrons into thermal neutrons

111340. The first metal used by man was?

Answer: copper

111341. The hydronium ion is?

Answer: H3O+

111342. The method that cannot be used for removing permanent hardness of water is?

Answer: boiling

111343. The gas used for artificial ripening of green fruit is?

Answer: ethylene

111344. Zone refining is used for the purification of?

Answer: Ge

111345. The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is?

Answer: cineole

111346. he high reactivity of fluorine is due to?

Answer: its high electro negativity

111347. The iron ore magnetite consists of?

Answer: Fe2O3

111348. 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?

Answer: 5x/36

111349. The major constituent of air is?

Answer: nitrogen

111350. The main chemical constituent of clay is?

Answer: aluminium silicate
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