The pressure exerted by saturated water vapour is called aqueous tension. The pressure of the dry gas can be calculated as?

• A. P₍ₕₑ₎ = P₍ₜₒₜₐₗ₎ - aqueous tension
• B. P₍ₕₑ₎ = P₍ₜₒₜₐₗ₎ + aqueous tension
• C. P₍ₕₑ₎ = P₍ₜₒₜₐₗ₎ / aqueous tension
• D. P₍ₕₑ₎ = P₍ₜₒₜₐₗ₎ × aqueous tension

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)