Chemistry

Glycerine is purified by

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(a) vacuum distillation (b) simple distillation (c) steam distillation (d) sublimation

Correct Answer:

vacuum distillation

Explanation:

The compounds which decompose at a temperature below their normal boiling points […]

The number of primary, secondary and tertiary carbons in 3,4-dimethylheptane are respectively

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(a) 4,3 and 2 (b) 2,3 and 4 (c) 4,2 and 3 (d) 3,4 and 2

Correct Answer:

4,3 and […]

116 mg of a compound on vaporisation in a Victor Meyer’s apparatus displaces 44.8 mL of air measured at S.T.P. The molecular weight of the compound is

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(a) 116 (b) 232 (c) […]

An organic compound contains 49.3% carbon, 6.84% hydrogen and its vapour density is 73. Molecular formula of the compound is

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(a) C₃H₈O₂ (b) C₃H₁₀O (c) C₆H₉O (d) C₆H₁₀O₄

Correct Answer:

C₆H₁₀O₄

Explanation: […]

Difference in density is the basis of

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(a) ultrafiltration (b) molecular sieving (c) gravity separation (d) molecular attraction

Correct Answer:

gravity separation

Explanation:

Gravity separation or hydraulic washing is the process of […]

Chromatography is a valuable method for the separation, isolation,purification and identification of the constituents of a mixture and it is based on general principle of

Options

(a) phase rule (b) phase distribution (c) […]