Stoichiometry

371. What is the simplest formula of a compound containing 50% of element A (atomic weight = 10) and 50% of element B (atomic weight = 20)?

1. AB₃
2. A2B₃
3. A₂B
4. AB₂

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372. What is the total pressure exerted by a mixture of 0.45 kg mole of benzene, 0.44 kg mole of toluene and 0.23 kg mole of o-xylene at 100°C, if their vapor pressures at 100°C are 1340, 560 and 210 mmHg respectively ?

1. 756.2
2. 780.5
3. 801.5
4. 880.5

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373. Which equation is not an equation of state?

1. PV = RT + B/V + y/V² + ....
2. (P + a/V²)(V-b) = RT
3. loge (p/p0) = (λ/R) (1/T0 - 1/T)
4. p = [RT/(V - b)] - (a/TV²)

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374. Which form of silica has the highest specific gravity?

1. Quartz
2. Cristobalite
3. Tridymite
4. All have the same specific gravity

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375. Which is a neutral refractory?

1. Graphite
2. Magnesite chrome
3. Silica
4. Magnesia

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376. Which is an acidic refractory?

1. Magnesite
2. Dolomite
3. Fireclay
4. Chrome magnesite

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377. Which is not an acidic refractory?

1. Silica
2. Fireclay
3. High alumina refractory
4. Carbon black

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378. Which of the following expressions defines the Baume gravity scale for liquids heavier than water?

1. (141.5/G) - 131.5
2. 145 - (145/G)
3. 200 (G-1)
4. (400/G) - 400

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379. Which of the following expressions defines the Baume gravity scale for liquids lighter than water?

1. °Be = (140/G) - 130
2. °Be = 200(G-1)
3. °Be = 145 - (145/G)
4. °Be = (400/G) - 400

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380. Which of the following gases is the most soluble in water?

1. NH₃
2. CO₂
3. H₂S
4. CH4

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