JEE Main Test 143

Result

JEE Main Test 143

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Weekly Quiz Competition

Question 1
4 / -1

The acidic hydrolysis of ether (X) shown below is fastest when

A
one phenyl group is replaced by a methyl group

B
one phenyl group is replaced by a para-methoxyphenyl group

C
two phenyl groups are replaced by two para-methoxyphenyl groups

D
no structural change is made to X

Solution

For the given reaction of acidic hydrolysis of ether will be fastest when two phenyl groups are replaced by two-para –methoxy phenyl groups .The given reaction follow S_N¹ reaction followed by stability of carbocation. As the stability of carbocation increases, the rate of hydrolysis of ethers increases.
Question 2
4 / -1

A

B

C

D

Solution
Question 3
4 / -1

Williamson's synthesis is used for the preparation of

A
acid

B
ester

C
ether

D
alcohol

Solution

Williumson’s synthesis method is suitable for the preparation of a wide variety of unsymmetric ethers. The nucleophilic substitution of halides with alkoxides leads to desired products.
Question 4
4 / -1

Thermite process is used in the reduction of

A
Cr₂O₃

B
Al₂O₃

C
PbO₂

D
CuO

Solution

Thermite process is very useful for the welding of broken metal parts. When Aluminimum powder reacts with iron oxide or chromium oxide, a large amount of heat is released and about a temperature of 3500^oC is attained which is enough to weld broken metallic parts.
Question 5
4 / -1

In the brown ring test, the brown colour of the ring is due to

A
ferrous nitrate

B
ferric nitrate

C
a mixture of NO and NO₂

D
ferrous nitrososulphate

Solution

When a freshly prepared acidified solution of ferrous sulphate is added to a solution of nitrate ions, in the presence of conc. H₂SO₄, a deep brown ring is formed. This deep brown ring is due to the formation of the complex sphere [(FeCH₂O)₅NO]SO₄. i.e. Ferrous nitrosulphate.
Question 6
4 / -1

A

B

C

D

Solution
Question 7
4 / -1

A
1/9

B
1/8

C
1/7

D
9

Solution
Question 8
4 / -1

A

B

C

D

Solution
Question 9
4 / -1

Area (in sq units ) bounded by the curves y = e^x, y = e^-x and the straight linex = 1 is

A

B

C

D

Solution
Question 10
4 / -1

A green light is incident from the water to the air-water interface at the critical angle (θ). Select the correct statement.

A
The entire spectrum of visible light will come of the water at an angle of 90° to the normal.

B
The spectrum of visible light whose frequency is less than that of green light will come out of the air medium.

C
The spectrum of visible light whose frequency is more than that of green light will come out to the air medium.

D
The entire spectrum of visible light will come out of the water of various angles to the normal.

Solution