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21. Amount of sodium hydroxide present in 500 ml of 0.2 M solution is (NTSE Odisha, Stage-I, 2013-14)
4 g
8 g
40 g
20 g
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22. The amount of NaOH in 750 ml of 0.2 M solution IS (NTSE Rajasthan, Stage-I, 2013-14)
2 g
6 g
23. One mole of magnesium nitride on reaction with excess of water gives (NTSE Haryana, Stage-I, 2013-14)
One mole of ammonia
Two moles of ammonia
One mole of nitric acid
Two moles of nitric acid
24. Which of the following is a suitable example for illustrating the law of conservation of mass? (Atomic mass of 0= 16; H = 1) (NTSE Stage-II, 2012-13)
18 g of water is formed by the combination of 16 g oxygen and 2 g of hydrogen
18 g of water in liquid state is obtained by heating 18 g of ice
18 g of water is completely converted into vapour state on heating
18 g of water freezes at 4°C to give same mass of ice
25. A metal M has its Chloride formula MCI3 and equivalent weight of metal is 9. Atomic weight of element is (NTSE Uttar Pradesh, Stage-I, 2014-15)
9
18
27
3
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