An organic compound which produces a bluish green coloured flame on heating in presence of copper is chlorobenzene

188.    An organic compound which produces a bluish green coloured flame on heating in presence of copper is

(A) chlorobenzene

(B) benzaldehyde

(C) aniline

(D) benzoic acid

Answer:: (A)

189.    During the formation of a chemical bond

(A) energy decreases

(B) energy increases

(C) energy of the system does not change

(D) electron-electron repulsion becomes more than the nucleus-electron attraction

Answer:: (A)

190.    E1, E2 and E3 are the emf values of the three galvanic cells respectively.

a) Zn | || |Cu

b) Zn | || |Cu

c) Zn | || |Cu

Which one of the following is true?

(A) E3 > E2 > E1

(B) E2 > E3> E1

(C) E1 > E3> E2

(D) E1 > E2> E3

Answer:: (A)

191.    Ellingham diagram represents a graph of

(A) DG Vs T

(B) DG0 Vs T

(C) DS Vs P

(D) DG Vs P

Answer:: (B)

192.    Enthalpy change for the reaction, 4H(g) ® 2H2(g) is –869.6 kJ. The dissociation energy of H – H bond is

(A) +217.4 kJ

(B) –434.8 kJ

(C) –869.6 kJ

(D) +434.8 kJ

Answer:: (D)