Chemistry Test 73

Result

Chemistry Test 73

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Weekly Quiz Competition

Question 1
4 / -1

The enthalpy of neutralization of acetic acid and sodium hydroxide is –55.4 KJ. What is the enthalpy of ionization of acetic acid ?

A
–1.9 KJ

B
+1.9 KJ

C
+5.54 KJ

D
–5.54 KJ

Solution

Heat of ionization of weak acid

= 57.3 – 55.4

= 1.9 KJ
Question 2
4 / -1

The bond enthalpies of H₂ , X₂ and HX are in the ratio of 2 : 1 : 2. If the enthalpy for formation of HX is –50 KJ mol^–1, the bond enthalpy of H₂ is :-

A
200 KJ mol^–1

B
400 KJ mol^–1

C
100 KJ mol^–1

D
300 KJ mol^–1
Question 3
4 / -1

Calculate the work done when 1 mole Al₄C_3(s) react with water in closed vessel at 27°C against 3 atm atomspheric pressure ?

A
5 KJ

B
0 KJ

C
10 KJ

D
1 KJ

Solution

In closed vessel ΔV = 0

W = –PΔv = 0
Question 4
4 / -1

A + B —→ C

For reaction ΔH = –xJ

ΔS = –yJ

Reaction would be spontanrous at :-

A
Low temperature

B
High temperature

C
At all temperature

D
None

Solution

ΔG = ΔH – TΔS = – – (–) = – +

T↑ΔG = –ve
Question 5
4 / -1

If 150 calories of heat are added to a system and a work of 200 joule is done on the system then calculate change in internal energy of the system:-

A
430 Joule

B
830 Joule

C
–830 Joule

D
–430 Joule

Solution

Heat absorbed ; q = 150 cal

= 150 × 4.2 = 630 Joule

Work done on the system ; w = + 200 Joule

From first law of thermodynamics

ΔU = q + w

= 630 + 200

= 830 Joule
Question 6
4 / -1

An ion M⁺³ has electronic configuration [Ar]3s¹⁰4s². Element M belongs to :-

A
s-block

B
p-block

C
d-block

D
f-block

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Re-Attempt Weekly Quiz Competition

Chemistry Test 73

Result

Chemistry Test 73

Score

-

Rank

-

SHARING IS CARING

Question 1

–1.9 KJ

+1.9 KJ

+5.54 KJ

–5.54 KJ

Solution

Question 2

200 KJ mol–1

400 KJ mol–1

100 KJ mol–1

300 KJ mol–1

Question 3

5 KJ

0 KJ

10 KJ

1 KJ

Solution

Question 4

Low temperature

High temperature

At all temperature

None

Solution

Question 5

430 Joule

830 Joule

–830 Joule

–430 Joule

Solution

Question 6

s-block

p-block

d-block

f-block

User

Question Analysis

My Perfomance

Score

-

Rank

-

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200 KJ mol^–1

400 KJ mol^–1

100 KJ mol^–1

300 KJ mol^–1