If a and b are two integers, then which of the following may not be
an integer?
(a) a + b (b) a – b (c) a × b (d) a ÷ b
Which of the following shows the maximum rise in temperature?
(a) 23° to 32° (b) – 10° to + 1° (c) – 18° to – 11° (d) – 5° to 5°
Which of the following is different from the others?
(a) 20 + ( –25) (b) (– 37) – (– 32)
(c) (– 5) × ( –1) (d) ( 45 ) ÷ ( – 9)
Which of the following does not represent an integer?
(a) 0 ÷ (– 7) (b) 20 ÷ (– 4) (c) (– 9) ÷ 3 (d) (– 12) ÷ 5
– 35 × 107 is not same as
(a) – 35 × (100 + 7) (b) (– 35) × 7 + ( – 35) × 100
(c) – 35 × 7 + 100 (d) ( – 30 – 5) × 107
Explain the mechanism of the nucleophilic substitution reaction of bromoethane with aqueous KOH. Classify this reaction as SN1 or SN2 and justify your answer.
(– 25) × [6 + 4] is not same as
(a) (– 25) × 10 (b) (– 25) × 6 + (– 25) × 4
(c) (– 25) × 6 × 4 (d) – 250
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