Chemistry Test 172

Result

Chemistry Test 172

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Weekly Quiz Competition

Question 1
4 / -1

A
– 250 kJ

B
+ 125 kJ

C
– 125 kJ

D
+ 250 kJ

Solution
Question 2
4 / -1

Species acting as both Bronsted acid and base is

A

B

C

D

Solution
Question 3
4 / -1

Which of the following cannot act as reducing agent?

A
NO₂

B
SO₂

C
CO₂

D
ClO₂

Solution

In all the given compounds oxidation number of non metal is + 4. As C belongs to group IV and it is in its maximum oxidation state. So, reduction in oxidation number of nonmetal is not possible only in CO₂. As we know that reduction is always accompained by an increase in oxidation number of reducing agent. So, CO₂ cannot acts as reducing agent among the given choices.
Question 4
4 / -1

Hydrogen molecules differs from chlorine molecule in the following respect

A
Hydrogen molecule is non-polar but chlorine molecule is polar

B
Hydrogen molecule is polar while chlorine molecule is non-polar

C
Hydrogen molecule can form intermolecular hydrogen bonds but chlorine molecule does not

D
Hydrogen molecule cannot participate in coordination bond formation but chlorine molecule can

Solution

Chlorine has lone pair which it can donate to form coordinate bond while hydrogen cannot.
Question 5
4 / -1

Which of the following are arranged in increasing order of solubilities?

A

B

C

D

Solution

Lesser the lattice energy, more will be the solubility in H₂O.
Question 6
4 / -1

Which of the following compounds is not matched correctly with its structure?

A

B

C

D

Solution
Question 7
4 / -1

The number of asymmetric C-atom created and number of possible stereoisomers when benzil (PhCOCOPh) is reduced with LiAlH4.

A
2, 3

B
2, 2

C
2, 4

D
3, 2

Solution

The product contains two similar asymmetric carbon atoms and two optically active and one optically inactive meso form.
Question 8
4 / -1

A group which deactivates the benzene ring towards electrophilic substitution but which directs the incoming group principally to the o- and p-positions is

A
–NH₂

B
–Cl

C
–NO₂

D
–C₂H₅

Solution

–Cl group is o-, p-directing due to +R effect ; however it is deactivating due to strong –I effect of Cl (difference from other o-, p-directing groups which are activating). The net result is that chlorobenzene undergoes o-, psubstitution, but with difficulty.
Question 9
4 / -1

Thermal pollution affects mainly –

A
vegetation

B
aquatic creature

C
rocks

D
air

Solution

Thermal pollution is caused by power plants. Power plant requires a larger quantity of water for cooling. The water after cooling is left in the water body. The temperature of left water is generally very high and affects aquatic life.
Question 10
4 / -1

A
0.414

B
0.155

C
> 0.731

D
0.731

Solution