Question

1. An element occupies group number 13 and period number 2 is an representative element of that
group react with carbonadioxide and forms as oxide (A). (A) reacts with CuSO4 give blue beads (B).
Identify the element, compound (A) and (B). Write the reaction.
2. BF3 reacts with LiH and forms a compound A. The compound a reacts with water to give the
compound B. A reacts with ammonia at 390K and form C. Identify (A), (B) and (C).
3. An element occupies group number 15 and period number 2 reacts with hydrogen under high
pressure and in the presence of a catalyst it forms a hydride (A). In presence of excess of air and in the
presence of platinum it forms an oxyacid (B). Identify the element, A and B.
4. An element occupies group No. 16 and period number 2. The element on passing through silence
electric discharge forms (A). (A) also reacts with lead sulphide and form (B). (A) also reacts with BaO2
and forms (C). It reacts with H2O2 and forms (D). Identify the dement (A), (B), (C)and (D).
5. An element occupies group No. 14 and period number 2 exists indifferent allotropic forms. One
form of this element has lubricating property (A). Another form is the hardest substance (B). New
allotropic of this element is named as Buckyball (C) and a is superconducting. Identify the element,
(A and B and C)
PLEASE HELP ME.....FIND THE ELEMENTS FAST.... IT IS URGENT

Answer 1

ans. 1-Boron
ans. 5-carbon