8. what trouble they faced in the post office in post haste story
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Q 3.The metal which is liquid at room temperature is
(a) sodium
(b) bromine
(c) calcium
(d) mercury
Answer: (d) mercury
Q.4 Which one of the following metals is the most ductile?
(a) Aluminum
(b) Copper
(c) Silver
(d) Gold
Answer: (d) Gold
Q 5.Which one of the following metals is the most reactive and stored in kerosene?
(a) Iron
(b) Gold
(c) Copper
(d) Potassium
Answer: (d) Potassium
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