MCQ-11
How many elements of s-block are present in period 2
A. 4
B. 1
C. 8
D. 2
Answer: D
MCQ-12
IIA elements on reaction with oxygen produce their oxides and these oxides are very stable due to their.
A. High lattice energy
B. High reactivity
C. High solubility
D. All of these
Answer: A
MCQ-13
Which of the following oxide is amphoteric in nature?
A. BeO
B. MgO
C. Al2O3
D. Both A and C
Answer: D
MCQ-14
Which of the following process is endothermic?
A. O-1(g) + 1e– → O-2(g)
B. Mg+1(g) → Mg+2(g) + 1e–
C. Al+(g)2 → Al+3(g) + 1e–
D. All of these
Answer: D
MCQ-15
How many completely filled orbitals are present in Mg+2?
A. 1
B. 3
C. 5
D. 6
Answer: C
