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.
1784.04 - 483.98 + 464.98 ÷ 15.06 = ?3
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
(168.24 ÷ 23.98) x 19.81 + ? = 176.33
64.889% of 399.879 + √? = 54.90% of 799.80 – 44.03% of 400.21
A bag contains 25 white and some black balls. If the probability of drawing a black ball from the bag is thrice that of drawing a white ball, fin...
49.96% of 120.21 + √(15) ÷ 1.87 × 4.41 = ?Â
619.97 ÷ 20.01 X 124.99 ÷ 24.91 = ?
180.25 × 14.995 ÷ √26 = ? × 5.985
A number is first increased by 35% and then decreased by 35%. If the net change in the number is 302.5, then find the original number.
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