Considering the reaction C(S) +O2(g)¾® CO2(g)+393.5 kJ the signs of DH , DS and DG respectively are -, +, -

171.    Considering the reaction C(S) +O2(g)¾® CO2(g)+393.5 kJ the signs of DH , DS and DG respectively are

(A) -, +, -

(B) -, -, -

(C) -, +, +

(D) +, -, -

Answer:: (A)

172.    Considering the state of hybridization of carbon atoms, find out the molecule among the following which is linear?

(A) CH3 -  CH2 - CH2 - CH3

(B) CH3 - CH = CH - CH3

(C) CH3 - C º C - CH3

(D) CH2 = CH - CH2 - C º CH

Answer:: (C)

173.    Cooking is fast in a pressure cooker, because

(A) food is cooked at constant volume.

(B) loss of heat due to radiation is minimum.

(C) food particles are effectively smashed.

(D) water boils at higher temperature inside the pressure cooker.

Answer:: (D)

178.    Dalda is prepared from oils by

(A) oxidation

(B) reduction

(C) hydrolysis

(D) distillation

Answer:: (B)

179.    Dalton's law of partial pressures is applicable to which one of the following systems?

(A) CO + H2

(B) H2 + Cl2

(C) NO + O2

(D) NH3 + HCl

Answer:: (A)

180.    Decomposition of benzene diozonium chloride by using Cu2Cl2/HCl to form chlorobenzene is

(A) Cannizarro's reaction

(B) Kolbe's reaction

(C) Sandmeyer's reaction

(D) Raschig's reaction

Answer:: (C)