1. Boron is non-metal whereas AI is metal. It is due to
A. Small size
B. High nuclear charge
C. Both A and B
D. No authorized justification yet
✅ The correct answer is option C.
Group 3A and 4A Elements MCQs
2. Boron in soil has been considered micronutrient for
A. Soil porosity
B. Proper growth of plants
C. Alkalinity of soil
D. All
✅ The correct answer is option B.
3. One of the outstanding features of boron is its ability to form
A. Molecular addition compounds
B. Molecular crystals
C. Semiconductors
D. Ionic compounds
✅ The correct answer is option A.
4. The substance which is found in dried up lakes of Tibet and California is
A. Tincal
B. Boric acid
C. Calcium carbonate
D. Colemanite
✅ The correct answer is option A.
5. Borax is a white crystalline solid and it is
A. More soluble in cold water
B. More soluble in hot water
C. Insoluble in water
D. Soluble only in organic solvents
✅ The correct answer is option B.
6. Which of the following does not give Borax bead test?
A. Cu
B. Cr
C. Ni
D. A1
✅ The correct answer is option D.
7. The special feature of borate glass is that it is
A. Heat resistant
B. Low melting
C. Used to prepare the chemical garden
D. Green in colour
✅ The correct answer is option A.
8. The metal which is used in thermite process because of its activity is
A. Iron
B. Copper
C. Aluminium
D. Zinc
✅ The correct answer is option C.
9. Aluminium oxide is
A. Acidic oxide
B. Basic oxide
C. Amphoteric oxide
D. It does not exist
✅ The correct answer is option C.
10. Which of the following shows inert pair effect?
A. Boron
B. Carbon
C. Silicon
D. Tin
✅ The correct answer is option D.