P – BLOCK ELEMENTS – 13

1) Which of the following is a good conductor of electricity ? a) Antracite b) Diamond c) Charcoal d) Graphite 2) Which of the following is a semiconductor ? a) C b) Pb c) Ge d) Sn 3) The inert form of carbon is a) Diamond b) Graphite c) Coal d) Charcoal 4) Synthesis gas …

P – BLOCK ELEMENTS – 11

1) The compound containing a coordinate bond is a) b) c) d) All 2) The normality of 2.3 M H2SO4 solution is a) 2.3 N b) 4.6 N c) 0.46 N d) 0.23 N 3) When potassium ferrocyanide crystals are heated with conc. H2SO4, the gas evolved is a) b) c) d) CO 4) Which …

P – BLOCK ELEMENTS – 8

1) Compounds A and B are treated with dilute HCl separately. The gases liberated are Y and Z respectively. Y turns acidified dichromate paper green, while Z turns lead acetate paper black. So A and B are respectively a) b) c) d) 2)¬†Which of the following is a liquid? a) b) c) d) 3) Which …

P – BLOCK ELEMENTS – 7

1) The lone pair present on VA group elements in their hydrides more easily participates in bond formation in a) b) c) d) None 2) Which gives a mixture of SO2 and SO3 on heating? a) b) c) d) 3) The right sequence of acidic character is a) b) c) d) 4) The bonds present …

P – BLOCK ELEMENTS – 10

1) The basicity of orthophosphoric acid is a) 2 b) 3 c) 4 d) 5 2) reacts with water to form a) b) c) d) 3) is heated with water to give a) Hypophosphoric acid b) Orthophosphoric acid c) Hypophosphorous acid d) Orthophosphorous acid 4) Which of the following reacts rapidly with oxygen in the …

P – BLOCK ELEMENTS – 9

1) UV radiation of sun does not reach the earth because the upper layer of the atmosphere contains a) b) c) d) 2) The compound of sulphur that can be used as a refrigerant is a) b) c) d) 3) Arrange the hydrides of chalcogens in the increasing order of ease of formation: a) b) …

P – BLOCK ELEMENTS – 6

1) Which of the following oxyacids of chlorine is least oxidising in nature? a) HOCl b) c) d) 2) The melting point of halogens decreases in the order a) b) c) d) 3) The bleaching solution used for bleaching cloth and paper contains a) b) c) d) 4) The increasing order of reducing power of …

P – BLOCK ELEMENTS – 4

1) Which of the following is cyclic phosphate? a) b) c) d) 2) Which of the following halides is the most acidic? a) b) c) d) 3) The acid which forms two and only two series of salts is a) b) c) d) 4) Which of the following has the least covalent P-H bond? a) …