JEE Main Test 71

Result

JEE Main Test 71

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Weekly Quiz Competition

Question 1
4 / -1

Galvanic cell is a device in which

A
chemical energy is converted into electrical energy

B
electrical energy is converted into chemical energy

C
chemical energy is seen in the form of heat

D
thermal energy from an outside source is used to drive the cell reaction

Solution

A galvanic cell, or voltaic cell, named after Lugi galvani, or Alessandro volta respectively, is an electrochemical cell that derives electrical energy from spantaneous redox reactions taking place within the cell.
Question 2
4 / -1

A
∞

B
1/2

C
4

D
1

Solution
Question 3
4 / -1

If the mass defect of ₅B¹¹ is 0.081 u, its average binding energy (in MeV) is

A
8.60

B
6.85

C
5.60

D
5.86

Solution
Question 4
4 / -1

Which of the following arrangements does not represent the correct order of the property stated against it?

A
V²⁺ < Cr²⁺ < Mn²⁺ < Fe²⁺ (paramagnetic behaviour)

B
Ni²⁺ < Co²⁺ < Fe²⁺ < Mn²⁺ (ionic size)

C
Co³⁺ < Fe³⁺ < Cr³⁺ < Sc³⁺ (stability in aqueous solution)

D
Sc < Ti < Cr < Mn (number of oxidation states)

Solution

More the unpaired electrons, more in the paramagnetic nature.
Question 5
4 / -1

A
differentiable both at x = 0 at x = 2

B
differentiable at x= 0 but not differentiable at x= 2

C
not differentiable at x = 0 but differentiable at x = 0

D
differentiable neither at x = 0 nor at x = 2

Solution
Question 6
4 / -1

The actinoides exhibit more number of oxidation states in general than the lanthanoides. This is because

A
the 5f-orbitals are more buried than the 4f-orbitals

B
there is a similarity between 4f and 5f-orbitals in their angular part of the wave function

C
the actinoids are more reactive than the lanthanoids

D
the 5f-orbitals extend further from the nucleus than the 4f-orbitals

Solution

Because actinides are bigger, the outer most shell is further away from the nucleus that means the ionization energy is lower for the corresponding oxidation state compared lanthanides.
Question 7
4 / -1

A
2

B
–1

C
a/b

D
0

Solution
Question 8
4 / -1

Consider the following complex ions, P,Q and R.

P = [FeF₆]^3- ,Q = [V(H₂O)₆]²⁺ and
R = [Fe(H₂O)₆]²⁺ .

The correct order of the complex ions, according to their spin-only magnetic moment values(in BM is)

A
R < Q < P

B
Q < R < P

C
R < P < Q

D
Q < P < R

Solution

Spin only magnetic moment of the complex ions can be calculated as,
Question 9
4 / -1

Four compounds, toluene (I), o -dichlorobenzene (II), m -dichlorobenzene (III) and p - dichlorobenzene (IV) are arranged in order of increasing dipole moment. The correct order is

A
IV < I < III < II

B
I < II < III < IV

C
II < IV < III < I

D
IV < III < II < I

Solution
Question 10
4 / -1

A
1/x

B
x

C
x²

D
1/x²

Solution