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objective Ques (158 results)
51)

Which of the following is not possible ?

JEE Physics
A)

n = 2, l = 0, m = -1

B)

n = 3, l = 0, m = 0

C)

n = 3, l = 1, m = -1

D)

n = 2, l = 1, m = 0

52)

Which of the following sets of quantum numbers is correct for an electron in 4 f -orbital ?

JEE Physics
A)

n = 4, l = 3, m = + 1, s = + 1/2

B)

n = 4, l = 3, m = + 4, s = + 1/2

 

C)

n = 4, l = 4, m = - 4, s = - 1/2

D)

n = 3, l = 2, m = -2, s = + 1/2

53)

Non-directional orbital is

JEE Physics
A)

4p

B)

4d

C)

4f

D)

3s

54)

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

JEE Physics
A)

IV & V

B)

III & IV

C)

II & III

D)

I & II

55)

Which one of the following oxidation states is not possible in metal carbonyls ?

 

JEE Physics
A)

+1

B)

-1

C)

0

D)

2

E)

-3

56)

The oxidation number of chromium in potassium dichromate is

JEE Physics
A)

+2

B)

+4

C)

+1

D)

+8

E)

+6

57)

The loss of electron is termed as

JEE Physics
A)

oxidation

B)

reduction

C)

combustion

 

D)

neutralization

58)

State the oxidation number of carbonyl carbon in methanal and methanoic acid, respectively

 

1) 0 and 0

 

2) 0 and + 2

 

3) + 1 and + 2

 

4) + 1 and + 3

JEE Physics
A)

0 & 0

B)

0 & +2

C)

+1 & +2

D)

+1  & +3

59)

Which quantities are conserved in all redox reactions?

 

JEE Physics
A)

Charge only

 

B)

Both charge and mass

C)

Mass only

D)

Neither charge nor mass

60)

Oxidation number of sulphur in Caro's acid is

JEE Physics
A)

6

B)

8

C)

4

D)

7

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