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Complete the following statements by selecting the correct alternative from the choices given: (i)…
Complete the following statements by selecting the correct alternative from the choices given:
(i) The molal freezing point constant of water is $1\cdot86\text{ K kg mol}^{-1}$. Therefore, the freezing point of $0\cdot1\text{ M NaCl}$ solution in water is expected to be:
(1) $-1\cdot86^\circ\text{C}$
(2) $-0\cdot372^\circ\text{C}$
(3) $-0\cdot186^\circ\text{C}$
(4) $+0\cdot372^\circ\text{C}$
(ii) Which among the following reacts fastest by $\text{S}_\text{N}2$ reaction:
(1) $(\text{CH}_3)_3\text{C}-\text{Br}$
(2) $(\text{CH}_3)_2\text{CH}-\text{Br}$
(3) $\text{CH}_3-\text{CH}_2-\text{Br}$
(4) $\text{CH}_3-\text{Br}$
(iii) When acetaldehyde is treated with Grignard reagent followed by hydrolysis, the product formed is:
(1) Primary alcohol
(2) Secondary alcohol
(3) Carboxylic acid
(4) Tertiary alcohol
(iv) Which of the following ores can be concentrated by froth floatation process:
(1) Haematite
(2) Calamine
(3) Zinc blende
(4) Bauxite
Answer
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From ISC 2018 Specimen Chemistry Paper 1, question 1(b).