5. Choose the correct option. A. The unstable isotope of hydrogen is ..... a. H-1 b. H-2 c. H-3 d. H-4

Question

Choose the correct option. A. The unstable isotope of hydrogen is ..... a. H-1 b. H-2 c. H-3 d. H-4 B. Identify the odd one. a. Rb b. Ra c. Sr d. Be C. Which of the following is Lewis acid ? a. BaCl2 b. KCl c. BeCl2 d. LiCl D. What happens when crystalline Na2 CO3 is heated ? a. releases CO2 b. loses H2 O c. decomposes into NaHCO3 d. colour changes.

Answer 1

1) The unstable isotope of hydrogen is …..
a. H-1
b. H-2
c. H-3
d. H-4
Answer:
c. H-3

2)Identify the odd one.
a. Rb
b. Ra
c. Sr
d. Be
Answer:
a. Rb

3)Which of the following is Lewis acid ?
a. BaCl₂
b. KCl
c. BeCl₂
d. LiCl
Answer:
c. BeCl₂

4) What happens when crystalline Na₂CO₃ is heated ?
a. releases CO₂
b. loses H₂O
c. decomposes into NaHCO₃
d. colour changes.
Answer:
b. loses H₂O