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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.
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