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Which of the following statements are usually correct for carbon compounds? These (i) are good conductors of electricity (ii) are poor conductors of electricity (iii) have strong forces of attraction between their molecules (iv) do not have strong forces of attraction between their molecules (a) (i) and (iii) (b) (ii) and (iii) (c) (i) and (iv) (d) (ii) and (iv)

Answer: (d) (ii) and (iv) Because accepting and donating four electrons is difficult, carbon forms only covalent bonds. Because they are all... View Article

A non-metal A which is the largest constituent of air, when heated with H2 in 1:3 ratio in the presence of a catalyst (Fe) gives a gas B. On heating with O2 it gives an oxide C. If this oxide is passed into water in the presence of air, it gives an acid D which acts as a strong oxidising agent. (a) Identify A, B, C and D (b) To which group of periodic table does this non-metal belong?

Answer: (a) Non-metal “A” is nitrogen because it is the largest constituent of air which constitute around 78% of the gases. B is... View Article