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