Chemistry Test 104

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Chemistry Test 104

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following has highest coagulating power to coagulate a ferric hydroxide [Fe(OH)₃] sol ?

A
KCl

B
KNO₃

C
K₂SO₄

D
K₃[Fe(CN)₆]

Solution

Fe(OH)₃ = +ve sol
So effective ion is –ve = [Fe(CN)₆]^–3
higher –ve power among the following option.
Question 2
4 / -1

Which of the following is incorrect statement

A
Hardy Schulz rule is related to coagulation

B
Brownian movement and tyndall effect are shown by colloids

C
Gold numbers is a measure of protective power of lyophillic colloid

D
When liquid is dispersed in liquid. It is called gel
Question 3
4 / -1

For the coagulation of 50ml of ferric hydroxide sol. 10ml of 0.5 M KCl is required. What is the coagulation value of KCl ?

A
5

B
10

C
100

D
50

Solution

50 ml of Fe(OH)3 required → 5 m. mole of KCl so 1000 ml (1L solution) of Fe(OH)₃ required →

so coagulation value of KCl = 100
Question 4
4 / -1

A sample of ammonium phosphate, (NH₄)₃PO₄, contains 6 moles of hydrogen atoms. The number of moles of oxygen atoms in the sample is :

A
1

B
2

C
4

D
6
Question 5
4 / -1

A compound contains 69.5% oxygen and 30.5% nitrogen and its molecular weight is 92. The molecular formula of the compound is :-

A
N₂O

B
NO₂

C
N₂O₄

D
N₂O₅

Solution
Question 6
4 / -1

What volume of CO₂ at STP is obtained by thermal decomposition of 20 g KHCO₃ ?

[Atomic weight of K = 39]

2KHCO₃(s) → K₂O(s) + 2CO₂(g) + H₂O(g)

A
44.8 L

B
4.48 L

C
22.4 L

D
11.2 L
Question 7
4 / -1

50 g of CaCO₃ is allowed to react with 73.5 g of H₃PO₄. The moles of Ca₃(PO₄)₂ formed in the process is :

A
1/6

B
1/2

C
3/4

D
1/4

Solution

3CaCO₃ + 2H₃PO₄ → CO₃(PO₄)₂ + 3CO₂ + 3H₂O

= 1/2 = 0.74
= 0.5
CaCO₃ is L.R.
From 3 mole CaCO₃, 1 mole Ca₃(PO₄)₂ is formed
From 1/2 mole CaCO₃ ; = 1/3 mole Ca₃(PO₄)₂ is formed
Question 8
4 / -1

According to following reaction :

A + BO₃ → A₃O₄ + B₂O₃

The number of moles of A₃O₄produced if 1 mole of A is mixed with 1 mole of BO₃.

A
3

B
1

C
1/3

D
2/3
Question 9
4 / -1

One mole of ideal gas expands isothermally to ten times its original volume. The change in entropy is:-

A
0.1 R

B
2.303 R

C
10 R

D
100 R
Question 10
4 / -1

What will be the work done when one mole of a gas expands reversible isothermally from 15 L to 50 L at 25°C?

A
–3542 cal

B
–843.3 cal

C
–718 cal

D
–60.23 cal

Solution

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Chemistry Test 104

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Chemistry Test 104

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Question 1

KCl

KNO3

K2SO4

K3[Fe(CN)6]

Solution

Question 2

Hardy Schulz rule is related to coagulation

Brownian movement and tyndall effect are shown by colloids

Gold numbers is a measure of protective power of lyophillic colloid

When liquid is dispersed in liquid. It is called gel

Question 3

5

10

100

50

Solution

Question 4

1

2

4

6

Question 5

N2O

NO2

N2O4

N2O5

Solution

Question 6

44.8 L

4.48 L

22.4 L

11.2 L

Question 7

1/6

1/2

3/4

1/4

Solution

Question 8

3

1

1/3

2/3

Question 9

0.1 R

2.303 R

10 R

100 R

Question 10

–3542 cal

–843.3 cal

–718 cal

–60.23 cal

Solution

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KNO₃

K₂SO₄

K₃[Fe(CN)₆]

N₂O

NO₂

N₂O₄

N₂O₅