Here are some model questions from Physical Chemistry useful for JEE Main / Advanced examinations to be conducted from the academic year 2013-14. Answers also given at the end of the questions.
1. Assertion (A) : Cupric copper is paramagnetic
Reason (R) : Charge of one mole of cupric is two Faradays
1) Both A and R are true, R properly explains A
2) Both A and R are true, R does not explain A
3) A is true, but R is false
4) A is false, but R is true
2. In one of the Bohr’s hydrogen orbit electron revolving with a wavelength of 10A0. The kinetic energy of the electron is
1) 13.6 eV 2) 10.2 eV 3) 3.4 eV 4) 1.5 eV
3. In order to fill all the electrons of chromium (Z=24), number of orbitals required per atom is
1) 12 2) 13 3) 15 4) 24
4. Bond length of HCl is 1.275A° and experimental dipolemoment is 1.03D. The percentage ionic character of HCl is approximately
1) 16.8 2) 50.2 3) 66.7 4) 92.4
5. Aluminium fluoride is more ionic than aluminium chloride. This is because
1) Al is trivalent 2) Al3+ has high polarisation ability
3) F– is small in size 4) Cl – is less polarised
6. The ratio of pure and hybrid orbitals used for bonding in ethylene molecule
1) 1 : 1 2) 1 : 3 3) 3 : 1 4) 3 : 2
7. Ionic, covalent, dative and hydrogen bonds are all present in
1) ammonium chloride 2) epsom salt
3) potassium ferricyanide 4) sodium cyanide
8. Mayer’s relation Cp – Cv = R, can be applied for noble gases. Then the molar heat capacities at constant pressure and at constant volume are respectively
1) 1.5 R and 2.5 R 2) 2.5 R and 3.5 R
3) 3.5 R and 4.5 R 4) 4.5 R and 5.5 R
9. Under similar condition, the liquid that has highest vapour pressure among the following is
1) Diethyl ether 2) Ethanol
3) Acetic acid 4) Water
10. Packing density in the case of metal with face centered cubic structure is
1) 73% 2) 68% 3) 52% 4) 43%
11. 17 grams of hydrogen peroxide is present in 560ml of aqueous solution. This solution is called
1) 10 volumes 2) 17 volumes 3) 20 volumes 4) 34 volumes
12. Molecular weight of a bivalent metal chloride is 136.4. Then equivalent weight of the metal is
1) 26.2 2) 32.7 3) 52.4 4) 65.4
13. 100ml of pure phosphine is decomposed to produce phosphorous solid and hydrogen. Under similar conditions of measurement, the volume
1) increases by 50ml 2) decreases by 50ml
3) increases by 150ml 4) decreases by 150ml
14. The mass of natural water that has one mole of deuterium oxide (called heavy water) is
1) 1.2 kg 2) 12 kg 3) 120 kg 4)1200 kg
15. Weight percentage of chlorine in an alkali metal chloride is 48%. The atomic weight of the metal is likely
1) 56 2) 39 3)19 4)7
16. Regarding oxidation numbers, which of the following is false
1) Oxidation number of metal in metal carbonyl is zero
2) Oxidation number of oxygen in a super oxide is fractional
3) Fluorine exhibits –1 oxidation state
4) The sum of oxidation number of all atoms in an ion is equal to charge of ion
KEY: 1) 2 2) 4 3) 3 4) 1 5) 3 6) 1 7) 2 8) 3 9) 1 10) 1 11) 1 12) 2 13) 1 14) 3 15) 2 16) 1 .