Stoichiometry

271. Size range of the colloids particles is

1. 5 - 200 milli-microns
2. 50 - 200 microns
3. 500 - 1000 microns
4. 10 - 50 Angstrom

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272. Sodium _________ has inverted solubility curve i.e. its solubility increases with the lowering of temperature.

1. Carbonate (monohydrate)
2. Chloride
3. Thiosulphate
4. Bisulphite

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273. Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the

1. Same elevation in boiling point
2. Different elevation in boiling point
3. Elevation in boiling point in the ratio of their molecular weights
4. None of these

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274. Solutions having the same osmotic pressure are called _________ solutions.

1. Dilute
2. Ideal
3. Isotonic
4. Saturated

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275. Solutions which distil without change in composition are called

1. Ideal
2. Saturated
3. Supersaturated
4. Azeotropic

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276. Sometimes, in chemical processes, a part of the outlet stream is rejected as waste in order to keep the impurity level in the system within limits. This phenomenon is termed as the

1. Recycling
2. Purging
3. Bypassing
4. Recirculation

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277. Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of _________ °C.

1. 770
2. 570
3. 270
4. 70

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278. Specific gravity on API scale is given by the relation (where, G = specific gravity at 15.5°C).

1. °API = 200(G - 1)
2. °API = (141.5/G) - 131.5
3. °API = (140/G) - 130
4. °API = 145 - (145/G)

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279. Test piece for determination of RUL of a refractory is heated in a/an

1. Oxidising atmosphere
2. Reducing atmosphere
3. Electric furnace
4. Neutral atmosphere

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280. The accumulation in a steady state combustion process, burning 1 kg mole of carbon with 1 kg mole of oxygen thereby producing 1 kg mole of carbon dioxide, is _________ kg mole.

1. 1
2. 0
3. 16
4. 44

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