Chemistry Test 12

Result

Chemistry Test 12

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 / -0

The rate constant (k) for the reaction 2A + B → Products, was found to be
2.58 × 10^–5l mol^–1 s^–1 after 15 sec,
2.60 × 10^–5l mol^–1 s^–1 after 30 sec and
2.55 × 10^–5l mol^–1 s^–1 after 50 sec. Hence the order of the reaction is –

A
0

B
1

C
2

D
3

Solution

For n^th order, unit of k = (mol L^–1)^1–n × s^–1
For n = 2, unit of k = (mol L^–1)^1–2 × s^–1
= mol^–1 L s^–1.
Question 2
4 / -0

Coordination compound have great importance in biological systems. In this context which of the following statements is incorrect?

A
Chlorophylls are green pigments in plants and contains calcium

B
Carboxypeptidase – A is an enzyme and contains zinc

C
Cyanocobalamin is B₁₂ and contains cobalt

D
Haemoglobin is the red pigment of blood and contains iron

Solution

Chlorophyll contains magnesium instead of calcium
Question 3
4 / -0

Physical adsorption is accompanied by –

A
Decrease in entropy of system

B
Decrease in enthalpy

C
The value of TΔS is negative

D
All of these

Solution

Adsorption is thus accompanied by decrease in enthalpy as well as decrease in entropy of the system.
Question 4
4 / -0

Which of the following solutions will have the maximum lowering of vapour pressure at 300 K ?

A
1M NaCl

B
1M BaCl₂

C
1 M sucrose

D
1 M Phenol

Solution

1M BaCl₂ ionises to give three (3) ions as a result of which effective molality in solution increases by 3 times. Hence, it's freezing point is lowest.
Question 5
4 / -0

The species which can best serve as an initiator for the cationic polymerization is :

A
LiAIH₄

B
HNO₃

C
AICI₃

D
C₄H₉Li

Solution

Lewis acids can initiate the cationic polymerization.
Hence, option C is correct.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Chemistry Test 12

Result

Chemistry Test 12

Score

-

Rank

-

SHARING IS CARING

Question 1

0

1

2

3

Solution

Question 2

Chlorophylls are green pigments in plants and contains calcium

Carboxypeptidase – A is an enzyme and contains zinc

Cyanocobalamin is B12 and contains cobalt

Haemoglobin is the red pigment of blood and contains iron

Solution

Question 3

Decrease in entropy of system

Decrease in enthalpy

The value of TΔS is negative

All of these

Solution

Question 4

1M NaCl

1M BaCl2

1 M sucrose

1 M Phenol

Solution

Question 5

LiAIH4

HNO3

AICI3

C4H9Li

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.

Cyanocobalamin is B₁₂ and contains cobalt

1M BaCl₂

LiAIH₄

HNO₃

AICI₃

C₄H₉Li