The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is:A) The staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain.B) The eclipsed conformation of ethane is more stable than staggered conformation, because eclipsed conformation has no torsional strain.C) The eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain.D) The staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain.

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)