Chemistry Test 161

Result

Chemistry Test 161

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Weekly Quiz Competition

Question 1
4 / -1

Identify the incorrect statement among the following -

A
A catalyst cannot effect the position of equilibrium of a reaction.

B
A catalyst may change pre-exponential factor of a reaction.

C
Heterogeneous catalytic reactions are always zero ordered reactions.

D
It is possible that a species may increases activation energy of a reaction.
Question 2
4 / -1

CH₃–CH=O

The final product in the above reaction sequence is

A

B

C

D
Question 3
4 / -1

Directions For Questions

The wave function for an orbital is given as

Where a_o = First Bohr's radius in H atom = 0.529 A°.

...view full instructions

Read the given statements and pick out the incorrect statement.

A
The number of radial nodes is equal to three

B
The probability density is independent of direction

C
The probability density of finding electron at nucleus is non-zero.

D
The radial node occur at a distance 2a0 from nucleus

Solution

The orbital is 2s
*   no of radial node = n – l – 1 = 2 – 0 –1 = 1
   *   Probability density Ψ²
   *   Since Ψ contain no θ or ϕ terms – probability of finding electron do not depend upon direction

   at r = 2a₀ , Ψ = 0 : Corresponds to radial node.
Question 4
4 / -1

Heat liberated for an ideal gas undergoing reversible isothermal process is 1200 cal at 300 K. What will be Gibb’s free energy change for the process.

A
1200 cal

B
-1200 cal

C
400 cal

D
-400 cal

Solution
Question 5
4 / -1

N, N-diethylbenzamide on heating with NaOH solution forms

A

B

C

D

Solution
Question 6
4 / -1

Predict the structure of R from the given sequence of reaction :

A

B

C

D
Question 7
4 / -1

The equilibrium constant K_p for the reaction

is 4.0

What would be percentage dissociation of an equilibrium mixture of N₂O₄ and NO₂ formed by the dissociation of pure N₂O₄ at total pressure of 1.25 atm?

A
75

B
66.66

C
25

D
33.33

Solution
Question 8
4 / -1

How many stereo isomers are possible for the above compound ?

A
5

B
6

C
7

D
8

Solution
Question 9
4 / -1

Most stable resonating structure of diazomethane CH₂N₂

A

B

C

D

Solution

Complete octet and (–) charge on more EN element
Question 10
4 / -1

Three solution of strong electrolytes 25 ml of 0.1 M HX, 25 ml of 0.1 M H₂Y and 50 ml of 0.1N Z(OH)₂ are mixed. What is the pOH of the resulting solution ? [Given log 5 = 0.7]

A
1.6

B
7

C
12.4

D
11.6

Solution