A. Their oxides are basic
B. Their oxide and hydroxides are water soluble
C. Both a & b
D. They are found in the earth
✅ The correct answer is option C.
S-Block Elements MCQs
2. The word Alkali means
A. Base
B. Basic salt
C. Ashes
D. Spirit
✅ The correct answer is option C.
3. The formula of Chile saltpetre is
A. NaNO3
B. CaCO3
C. Ba (NO3)2
D. NH4Cl
✅ The correct answer is option A.
4. The elements which are very abundant in earth crust are
A. Si & AI
B. Ca & Mg
C. B & AI
D. All
✅ The correct answer is option A.
5. The oxides of beryllium BeO is
A. Acidic
B. Basic
C. Amphoteric
D. Neutral
✅ The correct answer is option A.
6. Which element is necessary for normal leaf development?
A. Si
B. Ba
C. Mg
D. Ca
✅ The correct answer is option D.
7. Li is different from its family members due to
A. Small size
B. High charge density
C. Less electropositivity
D. All of the above
✅ The correct answer is option D.
8. Carbonates of lithium are not stable like that of sodium due to
A. Low electronegativity
B. Low electropositivity
C. Low charge density
D. Not known yet
✅ The correct answer is option B.
9. Nitrates of which pair of elements gives different products on thermal decomposition?
A. Na K
B. Mg Ca
C. Li Na
D. Li Ca
✅ The correct answer is option C.
10. Which one of the following is not an alkali metal?
A. Francium
B. Caesium
C. Rubidium
D. Radium
✅ The correct answer is option D.