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PMT Sample Question Chemistry |
Chemistry
1. The separation energy of the electron, present in shell n = 3 is 1.51 eV. What is the energy in the first excited state?
(A) - 1.51 eV
(B) - 3.4 eV
(C) + 1.51 eV
(D) - 13.6 eV
2. If the electron is present in the n = 5 level, how many lines would be observed, in case of H- atom ?
(A) 10
(C) 7
(B) 5
(D)4
3. Total number of moles of electrons in one mole of K 2 Cr 2 0 7 will be
(A) 142
(C) 140
(B) 86
(D) 100
4. ? = X A - X B = 2. What is the percent ionic character for a covalent molecule A - B ?
(A) 46
(B) 50
(C) 20
(D) 30
5. If Y = then y will show the maximum value for the compound
(A) Rbl
(C) RbF
(B) Lil
(D) LiF
6. Three fold symmetrical axis is associated with the molecule
(A) NH 3
(B) C 2 H 4
(C) CO 2
(D) S0 2
7. K c for the reaction 2NaHCO 3(S) Na 2 CO 3(S) + CO 2(g) + H 2 O (g) is
(A) K c = [Na 2 CO 3 ]
[NaHCO 3 ] 2
(B) K c = [Na 2 CO 3 ] [CO 2 ] [H 2 O]
[NaHCO 3 ] 2
(C) K c = [CO 2 ] [H 2 O]
(D) K c = PCO 2 X PH 2 O
,.
8. A substance whose initial concentration is 'a' reacts according to zero order kinetics. The time required for completion will be
(A) a
K 0
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