An element A belongs to 14th group is a metal, which can be cut with a knife. It is not a good conductor of heat and electricity. A in pure state does not react with water but air dissolved water forms hydroxide. Identify A.

An element A belongs to 14th group and occupies period number 6. A reacts with conc. HCl to give B an acid. A is used to prepare C which is used as an antiknock in automobilies. Identify the element A and the compounds B and C write the reactions

An alkali metal (A) belongs to period number II and group number I react with oxygen to form (B). (A) reacts with water to form (C) with liberation of hydrogen compound Identify A, B, C.

An element A occupies group number 17 and period number 2, shows anomalous behaviour . A reacts with water forms a mixture of B,C and acid D. B and C are allotropes. A also reacts with hydrogen violently even in dark to given an acid D. Identify A,B,C and D write the reactions.

An element belongs to group 1 and period 3 reacts with chlorine gas to form A. (A) reacts with ammonium bicarbonate to give compounds (B) and (C). Compound period is beryllium (A). (B) is then heated to give compound (D). Identify A, B, C and D and write the respective equations.

An element occupies group number 1 and period number 3. This element when exposed to air gives compound (A). The element with water forms compound (B). Which is a strong base und (A) with ammonia gives compound (C ) which is used as reducing agent in organic chemistry. The element reacts with an halogen and forms cooking salt (D). Identify A, B, C and D.

An element A belonging to group 2 and period 2 reacts with chlorine at elevated temperature to give compound (B) compound B combines with LiAlH_4 to form compound (C). Which is an hydride identify A, B and C.

An element occupies group number 1 and period number 2. This element burns with air and forms compound A. With water, it gives compound B, with hydrogen it forms an ionic compound C. Identify the elements, A, B and C.