Entrance Guru:Chemistry Model questions and answers part 1
Chemistry
1) In a multi -electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields?
i) n=1, l=0,m=0
ii) n=2,l=0,m=0
iii) n=2,l=1,m=1
iv) n=3,l=2,m=1
v) n=3,l=2,m=0
a) (i)&(ii)
b) (ii)&(iii)
c) (iii)&(iv)
d) (iv)&(v)
2) Which one of the following has the regular tetrahedral structure?
(Atomic number B=5, S=16, Ni=28 ,Xe=54)
a) XeF4
b) SF4
c) BF4-
d) [Ni(CN)4]2-
3) The function of enzymes in the living system is to
a) catalysis biochemical reactions
b) provide energy
c) transport oxygen
d) provide immunity
4) Which of the following molecules/ions does not
a) O22-
b) B2
c) N2+
d) O2
5) Aspirin is an acetylation product of
a) m-Hydroxybenzoic acid
b) o-Dihydroxybenzene
c) o-Hydroxybenzoic acid
d) p-Dihydroxybenzene
Answers
1) d) (iv)&(v) Orbitals having same (n + 1) value in the absence of electric and magnetic field will have same energy.
2) c)BF4- is regular tetrahedral
3) a) catalysis biochemical reactions The enzymes are globular proteins which catalyse chemical reactions in the living systems.
4) a) O22-
5) c) o-Hydroxybenzoic acid Aspirin is acetyl salicylic acid,which is formed by acetylation of o- Hydroxybenzoic acid
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