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.

An element occupies group number 1 and period number 3. This element heated in air gives compound A. With water it gives compound B - a strong base. With ammonia gives compound C, which is used as a reducing agent in organic chemistry. Identify the element A,B and C.

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 occupies group number 2 and period number 3. This element reacts with oxygen and nitrogen to form compound A and B. It is a strong electropositive metal so it displaces Ag from AgNO_3 solution. With concentrated nitric acid, it forms compound C. Identify the element, compound A, B and C.

An element A occupies group number 15 and period number 3, reacts with chlorine to give compound B. The compounds B on hydrolysis gives a dibasic acid C. The compound C on heating undergoes auto oxidation and reduction to give a tribasic acid D. Identify the elements A, compounds B, C and D. Write the reactions.

An element A occupies group number 17 and period number 2, is the most electronegative element. Element A reacts with another element B, Which occupies group number 17 and period number 4, to give a compound C. CompoundC undergoes sp^3 d^2 hybridisation and has octahedral structure. Identify the elements A and B and the compound C. Write the reactions.

BF_(3) reacts with LiH and forms a compound A. The compound A reacts with water to give the compound B. A reacts with ammonia at 390 K and form C. Identify (A), (B) and (C).

An element occupies group no.13 and period number 2 is an representative element of that group reacts with carbondioxide and forms an oxide (A). (A) reacts with CuSO_(4) give blue beads (B). Identify the element compound (A) and (B). Write the reaction.

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 'A' occupies group number 15 and period number 3. It reacts with chlorine to give B which further reacts with chlorine to give C at 273 K . Both B and C are chlorinating agents for organic compounds. C is a better chlorinating agent because it chlorinates metals also. B reacts with SO_(3) and reduces it to SO_(2) . B has a pyramidal shape. C has trigonal bipyramidal shape by sp^(3)d hybridisation. Identify the element A and the compounds B and C. Write the reactions.