Question

i. The boiling points of hydrides of group 16 are in the order

a) H2O > H2Te > H2S > H2Se b) H2O > H2S > H2Se > H2He

c) H2O > H2Te > H2Se > H2S d) None of these


ii. Affinity for hydrogen decreases in the group from fluorine to iodine. What

of the halogen acids should have highest bond dissociation enthalpy?

a) HF b) HCl c) H Br d) HI


iii. If cone, of reactant 'A' is increased 10 times and rate of reaction becomes

100 times. What is order to 'A'?

a) 1 b) 2 c) 3 d) 4


iv. The half life period of first order reaction is 1386 seconds. The specific rate

constant of the reactions is.

a) 0.5x10-2

s

-1

b) 0.5x10-3

s

-1

c) 5.0x10-2

s

-1

d) 5.0x10-3

s

-1


v. The change required for the reductions of 1 mol of MnO2

-

to MnO2 is

a) 1 F b) 3 F c) 5 F d) 6 F


vi. Which of the following statement is correct?

a) E cell and of cell reaction both are extensive properties.

b) E cell and of cell reaction both are intensive properties

c) E cell is an intensive property while of cell reaction is an extensive

property.

d) E cell is an extensive property while of cell reaction is an intensive

property. ​

Answer 1

Answer:

H2O ought to have the lowest boiling point but it doesn't because of hydrogen bonding. Hydrogen Sulfide is -76*c. and is the minimum. Warmer still is Hydrogen Selenide with -41*c.