511. In 4.4 L of CO2, the number of oxygen atoms is:
(A) NA
(B) NA/10
C) 2 NA
(D) NA/5
512. Unit of Planck’s constant is:
(A) J/sec
B) J.Sec
(C) J.m
(D) J/m
513. The ratio of the radii of the second and first orbit of a hydrogen atom is:
(A) 2
(B) 3
C) 4
(D) 5
514. The radius of the first orbit of a hydrogen atom is 0.529 Å. The radius of the first orbit of Li2+ is:
(A) 1.27 Å
B) 0.17 Å
(C) 0.57 Å
(D) 0.99 Å
515. __ energy of an electron is negative:
(A) Kinetic
(B) Potential
(C) Total
D) Both B and C
516. The ratio of the energy of a photon of 250 nm to that of 500 nm is:
(A) 1/2
B) 2
(C) 1/4
(D) 4
517. The alkyl halide “CH3CH=CHCl” is named as:
(A) Chloroethene
(B) Chloroethane
C) 1-chloropropene
(D) 2-chloropropene
518. The alkyl halide “CH3CH=CHBr” is named as:
(A) Bromoethene
(B) Bromoethane
(C) 1-bromopropene
D) 2-bromopropene
519. The alkyl halide “CH3C≡CBr” is named as:
(A) Bromoethyne
(B) Bromoethane
C) 1-bromopropyne
(D) 2-bromopropyne
520. Alkyl halides can be classified as primary, secondary, or tertiary based on:
(A) The number of carbon atoms
(B) The type of halogen present
(C) The position of the halogen atom on the carbon chain
D) The degree of substitution of the carbon bonded to the halogen
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