Chemistry Test 19

Result

Chemistry Test 19

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

The secondary structure of a protein refers to

A
sequence of α-amino acids

B
fixed configuration of the polypeptide backbone

C
α-helical backbone

D
hydrophobicinteractions

Solution

Secondary structure of proteins involves α - helical back bond and β- sheet structures. These structures are formed as a result of H-bonding between different peptide groups.
Question 2
4 / -1

At 80 °C, the vapour pressure of pure liquid ‘A’ is 520 mm Hg and that of pure liquid ‘B’ is 1000mm Hg. If a mixture solution of ‘A’ and ‘B’ boils at 80 °C and 1 atm pressure, the amount of ‘A’ in the mixture is (1 atm = 760 mm Hg)

A
48 mol percent

B
50 mol percent

C
52 mol percent

D
34 mol percent

Solution

x_A × 520 + (1 – x_A)1000 = 760
⇒ 520x_A + 1000 – 1000x_A = 760
⇒ 480 x_A = 240

x_A=1/2
Question 3
4 / -1

When during electrolysis of a solution of AgNO₃, 9650 coulombs of charge pass through the electroplating bath, the mass of silver deposited on the cathode will be

A
1.08 g

B
10.8 g

C
21.6 g

D
108 g

Solution

Ag⁺ + e^– → Ag
9650C = 0.1 F = 0.1 equivalent Ag
= 0.1 mol Ag
= 10.8 g Ag
Question 4
4 / -1

Amongst the following the most basic compound is

A
benzylamine

B
aniline

C
acetanilide

D
p-nitroaniline

Solution

-NH₂ group is not linked with benzene ring.
Question 5
4 / -1

Identify the incorrect statement among the following:

A
The chemistry of various lanthanoids is very similar

B
4f and 5f orbitals are equally shielded

C
d-Block elements show irregular and erratic chemical properties among themselves

D
La and Lu have partially filled d orbitals and no other partially filled orbitals

Solution

4f and 5f belongs to different energy levels, hence the shielding effect is on them is not the same.
Shielding of 4f is more than 5f.