Question

Explain
1. The elements of which one following pairs of group would be expected to form compound of formula MX:
A. IIA and VIA
B. IIIA and IVA
C. IA and VIA
D. IVA and VIIA
2. Which one of the following configurations does not correspond to transition metal?
A. [Ar], 3d8, 4s2
B. [Ar], 3d10, 4s1
C. [xe], 6s1
3. An element X belongs to the 2nd group of periodic table. What is formula of its chlorides?
A. X2Cl
B. XCl2
C. X2Cl2
D. XCl
4. What type of oxide would Eka- aluminum form?
A. EO3
B. E3O2
C. E2O3
D. EO

Answer 1

3. b. XCl2
as X belongs to group 2, it will have 2 valence electrons. Hence valency is 2