Chemistry Test

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Chemistry Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following reaction is involved in the preparation of primary amines:
(i) Hofmann’s bromide reaction and
(ii) Gobriel phthalimide synthesis

A
(i)

B

(ii)

C
Both of these

D
None of these

Solution
Question 2
1 / -0

Due to lanthanide contraction

A
Fe, Co, Ni have equal size

B
Zr and Hf have equal size

C
All f-block ions have equal size

D
Zn and Zn⁺² have almost equal size

Solution

The lanthanide contraction cancels almost exactly the normal size increase on descending a group of transition elements. Thus, Zr and Hf have equal size.
Question 3
1 / -0

If n = 6, the correct sequence for filling of electrons will be :

A
$n s \to (n - 2) f \to (n - 1) d \to n p$

B
$n s \to (n - 1) d \to (n - 2) f \to n p$

C
$n s \to (n - 2) f \to n p \to (n - 1) d$

D
$n s \to n p \to (n - 1) d \to (n - 2) f$

Solution

Subshell being filled in order of increasing in (n + l) value if they are at same (n + l) value, then lower n value subshell is filled first as per Aufbau principle.
Question 4
1 / -0

Lowering of vapour pressure, $Δ p;$ elevation in boiling point. $Δ T_{b};$ and depression in freezing point, $Δ T_{f}$ of a solvent for the same molar concentration of each of the three solutes:
(A) sugar, (B) NaCl, and (C) BaCl₂ follow the sequence :

A
$Δ p : A < B < C$

B
$Δ T_{b} : C > B > A$

C
$Δ T_{f} : A < B < C$

D
All of these

Solution

If solute dissociates in the solution, e.g. NaCl, MgCl₂, BaCl₂, etc. the number of particles in solution will be more than that actually dissolved and value of colligative properties will be higher.
Question 5
1 / -0

Which of the following is involved in formation of heme?

A
Lysine

B
Glycine

C
Tyrosin

D
Arginine

Solution

The heme ring system is synthesized from glycine and succinyl $-\mathrm{CoA}$from the citric acid cycle
Question 6
1 / -0

A
$+ 0.772 V$

B
$- 0.772 V$

C
$+ 0.417 V$

D
$- 0.417 V$

Solution
Question 7
1 / -0

If Z is the number of atoms in the unit cell that represents the closest packing sequence...ABCABC...., the number of tetrahedral voids in the unit cell is equal to :

A
Z

B
2Z

C
$\frac{Z}{2}$

D
$\frac{Z}{4}$

Solution

No. of tetrahedral voids in closed packed ccp or fcc and hcp is double the number of atoms forming the main lattice.
Question 8
1 / -0

Aniline reacts with acetaldehyde to form

A
Schiff's base

B
Carbylamine

C
Immine

D
None of these

Solution

Aniline or any 1bamine reacts with aldehyde to form Schiff's base.
Question 9
1 / -0

The average kinetic energy of one molecule of an ideal gas at $27^{\circ} \mathrm{C}$ and 1 atm pressure is

A

B

C

D

Solution
Question 10
1 / -0

On warming with silver powder, chloroform is converted into

A
Acetylene

B
Hexachloroethane

C
1, 1, 2, 2-tetrachloroethane

D
Ethene

Solution