IIT-JEE Exam

The species which by definition has ZERO standard molar enthalpy of formation at 298 K is
(A) Br2 (g) (B) Cl2 (g)
(C) H2O (g) (D) CH4(g)

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IIT-JEE Other Question

Which of the following is the wrong statement ?
(1) Ozone is violet-black in solid state
(2) Ozone is diamagnetic gas
(3) ONCl and ONO– are not isoelectronic
(4) O3 molecule is bent The ionization isomer of ( ) ( ) 2 4 2 ⎡⎣Cr H O Cl NO ⎤⎦Cl is
(A) ( ) ( ) 2 4 2 2 ⎡⎣Cr H O O N ⎤⎦Cl (B) ( ) 2 4 2 2 [Cr H O Cl ](NO )
(C) ( ) ( ) 2 4 ⎡⎣Cr H O Cl ONO ⎤⎦Cl (D) ( ) 2 4 2 2 2 ⎡⎣Cr H O Cl (NO )⎤⎦ ⋅H O