The enthalpy of combustion of {{H}_{2}}, cyclohexane ({{C}_{6}}{{H}_{10}}) and cyclohexane ({{C}_{6}}{{H}_{12}}) are -241, -3800 and -3920 kJ/mol respectively. Heat of hydrogenation of cyclohexene is:A. -121kJ/molB. +121 kJ/molC. +242 kJ/molD. -242 kJ/mol

State the characteristics of hard soap and soft soap

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