Protons and electrons are called fundamental particles because they----------

• A. are indivisible
• B. have different charges
• C. are the lightest particles
• D. are found in all matter

The oxidation states of chlorine in HOCl, HClO₃ and HCLO₄ are respectively?

• A. -1, +5, and +7
• B. -1, -5 and 7
• C. +1, +3 and +4
• D. +1, +5 and +7

The conversion of open chain alkanes into cycloalkanes and aromatic compounds is called

• A. cracking
• B. reforming
• C. isomerization
• D. polymerization

(a) Three elements A, B and C have atomic numbers 8, 11 and 12 respectively.

(i) Write the formula of the compound formed by the chemical combination of A and B.

(ii) State which of the three elements belong(s) to the s-block of the Periodic Table. Give reason for your answer:

(b) List the component elements of bleaching powder.

Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s) In the reaction above, the oxidizing agent is

• A) CuSO4(aq)
• B) ZnSO4(aq)
• C) Cu(s)
• D) Zn(s)

Which of the following gases contains the highest number of atoms at s.t.p?

• A. 6 moles of neon
• B. 3 moles of oxygen
• C. 2 moles of chlorine
• D. 1 mole of ethane

Which of the following properties is not characteristic of electrovalent compounds?

• A. formation of crystalline solids
• B. solubility in polar solvents
• C. high vapour pressures
• D. high melting and boiling points

In a saturated solution at a given temperature, the undissolved solutes are in equilibrium with

• A. the solvent
• B. dissolved solute particles
• C. the saturated solution
• D. insoluble solute particles

The boiling point of pentane is higher than that of propane because?

• A. carbon-carbon single bonds are stronger than carbon-hydrogen bonds.
• B. Pentane has more covalent bonds to break
• C. Pentane does not burn easily as propane
• D. The intermolecular forces in pentane are stronger than those of propane

Which of the following transition metals is not attracted to external magnetic field?

• A. Cu
• B. Fe
• C. Ti
• D. Zn