Question
White phosphorus is stored in which of the following
substances?Solution
White phosphorus is a translucent white solid , is poisonous and insoluble in water. It glows in the dark (Chemiluminiscence). It is less stable and hence , more reactive. It is soluble in Carbon disulphide. Its molecular formula is P4. It is kept under water because it is highly reactive, and spontaneously combusts when exposed to the air. Hence, option B is correct.
25% of 400 + 3 × 102 = ?2Â
34 × 5 × 2 ÷ 6 + 7 × 5 + 13 = (?)× 6 – 754
What will come in the place of question mark (?) in the given expression?
(28/14) of 56 + ? = 920 ÷ 5
(26)2 = {(20% of 40% of 18200) ÷ ?} × 1664 ÷ 128Â
1500 × 60% of 25% = ? 2Â
? = 0.05% of 12000 + 175% of 4800 – 133Â
√(24²+285-8²-172) = ?²
Simplify the following expression:
40500 ÷ 30 × 42 – 45% of 2400 =? + 42100
√1444 + √729 – √2116 = ?
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