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31. What mass of hydrogen and oxygen will be produced on complete electrolysis of 18 g of water? (NTSE Delhi, Stage-I, 2014-15)
2 g hydrogen and 32 g oxygen
2 g hydrogen and 16 g oxygen
4 g hydrogen and 32 9 oxygen
4 g hydrogen and 14 9 oxygen
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32. The reaction of burning of carbon in oxygen is represented by the equation : C(s) + 02(g) →7C02(g) + Heat + Light When 9.0 g of solid carbon is burnt in 16.0 g of oxygen gas, 22.0g of carbon dioxide is produced. The mass of carbon dioxide gas formed on burning of 3.0g of carbon in 32.0 9 of oxygen would be (Note: atomic mass of C = 12.0 u, O = 16.0u) (NTSE Stage-II, 2013-14)
6.60g
7.33g
8.25 g
11.00 g
33. Molecule with a double bond is (NTSE Andhra Pradesh, Stage-I, 2012-13)
H2
F2
Cl2
O2
34. When two atoms combine to form molecule then (NTSE Mizoram, Stage-I, 2012-13)
Energy is released
Energy is absorbed
Energy is neither released nor absorbed
Energy may either be released or absorbed
35. About BF 3 , PF 3 and CIF 3 the correct statement is (NTSE Haryana, Stage-I, 2013-14)
All have similar shape
BF 3 and PF 3 have similar shapes but not CIF3
All have different shapes
PF3 and CIF3 have similar shapes but not BF3
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