ANSWER Q14. Option (C) is the correct answer. Atoms with large size have lower i

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ANSWER

Q14. Option (C) is the correct answer. Atoms with large size have lower ionisation energy because the last electron is loosely held.

Q15. Molecular speeds are inversly proportional to the square root of molar masses. Hence greater the molar mass of the gas lower is speed of its molecules. Hence the decreasing order of speeds should be Cl2 < O2 <CH4 <He. Hence optio (E) is the correct answer.

Q16. There are 8 A atoms and 4 B2 molecules , hence the reaction stiochiometry can be shown as

8A + 4B2 ----------------> 4A2B2

Devide by 4 to get the simplest ratio

2A + B2 ----------------> A2B2 , Hence option (C) is the correct answer.

Q17. A real gas will behave as ideal gas under high temperature and low pressure . hence option (B) is the correct answer.

Q18. All group I oxides are basic. Hence Cs2O is the answer , option (A)

Q19. Option (C) is the correct answer.

U = w + q

w = work is positive if done one the system , q = heat is positive if absorbed by the system

Q20. Option (D) is the correct answer.

Explanation / Answer

Page 3 of8 4) On the same period, if the radius ofatom X is greater than the radius of atom Y, then it is likely that E) X is a poorer conductor of clectricity than Y when in the solid state Answer ( B) X has a larger effective nuclear charge than Y does. 15) Arrange the following gases in order of decreasing average molecular speed at 25 C: He, O. CH, C1 C) He A2B2 B) 8A +4B2 4A2Bz C) 2A Answer 17) A real gas will behave most like an ideal gas under conditions of A) high temperature and high pressure C) at STP B) high temperature and low pressure E) low temperature and high pressure D) low temperature and low pressure Answer 18) Which of the following is a basic oxide? A) Cs O B) BeO C) N2Os D) SO E) CO2 Answer 19) When a system ,AU is always positive B) gives off heat and does work on its surroundings D) gives off heat and has work done on it A) absorbs heat and does work on its surroundings C) absorbs heat and has work done on it E) none of the above is always negative. Answer ( 20) An antibonding MO A) is always lower in energy than C) can accommodate fewer electrons than E) is always degenerate with the corresponding bonding MO. B) can accommodate more electrons than D) is always higher in energy than Answer (

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