Chemistry Test 143

Result

Chemistry Test 143

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Weekly Quiz Competition

Question 1
4 / -1

If helium and methane are allowed to diffuse out of the container under the similar conditions of temperature and pressure, then the ratio of rate of diffusion of helium to methane is .

A
1.0

B
0.5

C
4.0

D
2.0

Solution
Question 2
4 / -1

For a monatomic gas kinetic energy = E, the relation with rms velocity is

A
u⁡ = (3E⁡/2m⁡)^1/2

B
u⁡ = (E⁡/2m⁡)^1/2

C
u⁡ = (E⁡/3m)^⁡^1/2

D
u⁡ = (2E⁡/m)⁡^1/2

Solution

For a monatomic gas with only Translational degrees of freedom
E⁡_a = 3/2 k_⁡_bT⁡ (Avg K E per molecule)
Question 3
4 / -1

In this balanced equartion x, y, z are

A
2,3,6

B
1,3,4

C
1,3,6

D
2,6,6

Solution

So x = 1
y = 3
z = 6
Question 4
4 / -1

Propyne and propene can be distinguished by

A
Concentrated H₂SO₄

B
Br₂ in CCl₄

C
Dilute KMnO₄

D
ammonical AgNO₃

Solution

The terminal hydrogen is acidic in
H₃C - C ≡ CH
(propyne) and it reacts with ammoniacal AgNO₃. In propene, CH₃CH = CH₂ there is no acidic hydrogen.
Question 5
4 / -1

A piston is cleverly designed so that it extracts the maximum amount of work out of a chemical reaction, by matching P_external to the P_internal at all times. This 8cm diameter piston initially holds back 1 mol of gas occupying 1 L, and comes to rest after being pushed out a further 2 L at 25^oC .After exactly half of the work has been done, the piston has travelled out a total of

A
10.0 cm

B
11.2 cm

C
14.5 cm

D
20.0 cm

Solution
Question 6
4 / -1

A monatomic ideal gas undergoes a process in which the ratio of P to V at any instant is constant and equal to 1. What is the molar heat capacity of the gas?

A
4R/2

B
3R/2

C
5R/2

D
0

Solution
Question 7
4 / -1

Which of the following carboxylic acids undergoes decarboxylation easily ?

A
C₆H₅COCH₂COOH

B
C₆H₅COCOOH

C
C₆H₅CH(OH)COOH

D
C₆H₅CH(NH₂)COOH

Solution
Question 8
4 / -1

The most stable resonating structure of following compound is

A

B

C

D

Solution

Complete octet & Extended conjugation
Question 9
4 / -1

Heating mixture of Cu₂O and Cu₂S will give

A
Cu + SO₃

B
CuO + CuS

C
Cu₂SO₃

D
Cu + SO₂

Solution

Cu₂S + 2Cu₂O ⟶ 6Cu + SO₂

This is an example of auto - reduction.
Question 10
4 / -1

A solution which is 10^–3 M each in Mn²⁺, Fe²⁺, Zn²⁺ and Hg²⁺ is treated with 10^-16 M sulphide ion. If K_spof MnS, FeS, ZnS and HgS are 10^-13, 10^–18, 10^–24 and 10^–53 respectively, which one will precipitate first ?

A
FeS

B
MgS

C
HgS

D
ZnS

Solution

[S2^-] need for precipitation of

Thus minimum [S^2-] for precipitation is for HgS it will be precipitated first