The bond dissociation energies of gaseous {{H}_{2}}, C{{l}The bond dissociation energies of gaseous H2, Cl2 and HCl are 104 ,58 and 103 kcal respectively. The enthalpy of formation of HCl gas would be,
(A) 44kcal
(B) 44kcal
(C) 22kcal
(D) 22kcal_{2}} and HCl are 104 ,58 and 103 kcal respectively. The enthalpy of formation of HCl gas would be,(A) 44kcal(B) 44kcal(C) 22kcal(D) 22kcal

Which of the following is likely to be least stable?

• (A) Ca₄₀
• (B) Mn₅₅
• (C) Sn₁₁₉
• (D) Al₃₀

Which of the following is not a Lewis acid?

• A. BF₃
• B. AlCl₃
• C. FeCl₃
• D. PH₃

Which of the following is not a property of compounds?

• (A) They are made up of two or more kinds of atoms.
• (B) They cannot be broken down into two or more simpler substances by physical means but by chemical means only.
• (C) Properties of compounds differ from those of their elements.
• (D) None of the above.

Which of the following is polar?

• A. NF₃
• B. BF₃
• C. SF₄
• D. SiF₄

Which of the following metals exists in their native state in nature?

• (i) Ca
• (ii) Au
• (iii) Zn
• (iv) Ag

A. (i) and (ii)

B. (ii) and (iii)

C. (ii) and (iv)

D. (iii) and (iv)