Chemistry Test 116

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Chemistry Test 116

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Weekly Quiz Competition

Question 1
4 / -1

Choose the correct statement among the following :–

A
Zeta potential is the potential needed for electrophoresis.

B
During electrophoresis, colloidal particles in As₂S₃ solution move towards anode.

C
During electro osmosis, dispersed phase particles move towards oppositely charged electrode on applying electric field.

D
Tyndall effect can be shown by true solutions.

Solution

Colloidal particles in As₂S₃ solution are negatively charged
Question 2
4 / -1

For the Homogeneous 1^st order gaseous reaction A → B + C + D+ E....... + X + Y + Z. The initial pressure was P₀ while after time t, total pressure was P. The expression for rate constant k in terms of P₀, P and t is :

A
P₀ / P₀- P

B
25P₀ / 26P₀- P

C
24P₀ / 25P₀- P

D
24P₀ / P₀- 25P

Solution
Question 3
4 / -1

The orbital angular momentum corresponding to n = 4 and m = – 3 is

A
0

B
h / √2π

C
√6h / 2π

D
√3h / π

Solution

n = 4, m = – 3

i.e. only possible value of l is 3.

i.e. Orbital angular momentum
Question 4
4 / -1

The cell reaction for the given Galvanic cell

is spontaneous if

A
P₁ > P₂

B
P₁ < P₂

C
P₁ = P₂

D
P₂ = 1 atm

Solution

   Anode → 2Cl^– → Cl₂(g) + 2e^–
   Cathode → Cl₂(g) + 2e^–  2Cl^–
   -----------------------------------------------------
   Net reaction : → Cl₂(g)_cathode→ Cl₂(g)_anode
   Applying nerst equation

If P₂ > P₁ then cell will be spontaneous

Since E_cell will be positive.
Question 5
4 / -1

Chloropicrin is obtained by the reaction of

A
Steam on chlorobenzene

B
Nitric acid on chloroform

C
Nitric acid on chlorobenzene

D
Chlorin on picric acid

Solution

When chloroform is treated with concentrated nitric acid, its hydorgen is replaced by nitrogroup

CHCl₃ + HONO₂ → CNO₂Cl₃ + H₂O
Question 6
4 / -1

A compound which does not give a positive Lassaigne's test for 'N' is:

A
Urea

B
Hydrazine

C
Phenyl hydrazine

D
Glycine

Solution

Hydrazine does not have carbon atoms so it does not form NaCN and hence does not give a positive Lassaigne's test
Question 7
4 / -1

Which of the following compound can show Tautomerism :

A
(CH₃)₃C–CHO

B
D₂C = O

C

D

Solution

Option (D) have α-H atom ∴ it show tautomerism
Question 8
4 / -1

What is incorrect statement regarding reaction sequence :

A
B gives violet colour complex with neutral FeCl₃

B
C is orange colour dye.

C
Benzene is less reactive than product A for electrophillic aromatic substitution reaction.

D
Formation of C from B is coupling reaction.

Solution

where Cl is ring deactivating & less reactive.
Question 9
4 / -1

Which of the following reaction is example of free radical Halogenation reaction.

A
(1)

B
(2)

C
(3)

D
(4)

Solution

Sunlight / hν is responsible for formation of F. R.
Question 10
4 / -1

Which of the following alkyne can react with Grignard's Reagent.

A
But-2-yne

B
Pentyne

C
Pent-2-yne

D
Butene

Solution

Only terminal alkynes can react.