1) γ -rays can be used
2) The model of an atom consisting of a nucleus around which
electrons move in regular, defined orbitals was given by
3) The atomic numbers of four elements W, X, Y and Z are 17, 11, 20 and 3 respectively, which is a non-metal?
4) When white phosphorus is exposed to a measured volume of air
5) Helium and oxygen can be used for
6) Water changes the colour of anhydrous copper(II) tetraoxosulphate(VI) from
7) When anhydrous calcium chloride is exposed to the atmosphere, it absorbs enough water to form a solution. Anhydrous calcium chloride is
8) Which is a green house gas?
9) Which of the following reactions is not involved in the process of removing H2S from air?
2S(g) + 2Cl2(g) → 4HCl(g) + 2S(s)
(s) + 3O2(g) → 2SO3(g)
2O(l) →H2SO4(aq)

10) Which of the following solutions will liberate hydrogen gas when reacted with sodium metal?


 

 

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