Chemistry Test 101

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Chemistry Test 101

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Weekly Quiz Competition

Question 1
4 / -1

How much iron will be obtained by reduction of 1 kg of Fe₂O₃ according to this reaction :-

Fe₂O₃ + 3H₂ → 2Fe + 3H₂O

A
700 g

B
500 g

C
100 g

D
10 g
Question 2
4 / -1

The total number of neutrons present in 54 ml H₂O(ℓ) are :-

A
3 N_A

B
30 N_A

C
2 N_A

D
24 N_A
Question 3
4 / -1

Actual mass of hydrogen molecule is approximately:-

A
1.66 × 10^–24 g

B
3.3 × 10^–24 g

C
2 g

D
0.8 × 10^–24 g
Question 4
4 / -1

A compound was found to contain nitrogen and oxygen in the ratio 28:80. The empirical formula of compound is :-

A
NO

B
N₂O₃

C
N₂O₅

D
NO₂

Solution
Question 5
4 / -1

If 0.5 mol of CaBr₂ is mixed with 0.2 mol of K₃PO₄, the maximum number of moles of Ca₃(PO₄)₂ that can be formed is :

3CaBr₂ + 2K₃PO₄ → Ca₃(PO₄)₂ + 6KBr

A
0.1

B
0.2

C
0.5

D
0.7

Solution

3CaBr₂ + 2K₃PO₄ —→ 6KBr + Ca₃(PO₄)₂

3 mol 2 mol 6 mol 1 mol

According to the chemical reaction,

2 mol of K₃PO₄ reacts = 3 mol of CaBr₂

0.2 mol of K₃PO₄ reacts = 0.3 mol of CaBr₂

Moles of CaBr₂ left unreacted = 0.5 – 0.3 = 0.2

Hence, K₃PO₄ is the limiting reagent, since it reacts completely and it decides the amount of products, thus formed

2 mol of K₃PO₄ gives = 1 mol of Ca₃(PO₄)₂

0.2 mol of K₃PO₄ gives = 0.1 mol of Ca₃(PO₄)₂
Question 6
4 / -1

What volume of oxygen gas measured at 0°C and 1 atm is needed to burn completely 2L butane (C₄H₁₀) under same conditions ?

A
3 L

B
13 L

C
6.5 L

D
6 L

Solution
Question 7
4 / -1

How many litres of air are required to burn 5L methane ? (Air contains O₂ 20% by volume) :-

A
100 L

B
20 L

C
40 L

D
50 L
Question 8
4 / -1

10 moles of CH₄ combines with 18 moles of oxygen. Calculate the moles of CO₂ formed after combustion :-

A
10

B
9

C
18

D
24

Solution

10 9
CH₄ + 2O₂ → CO₂ + 2H₂O
10 18
∴ L.R. is O₂ ⇒ 18/2 = 9 (minimum)
O₂ CO₂
2 1
18 X
2x = 18 ⇒ x = 9 moles of CO₂ is formed
Question 9
4 / -1

For reaction A + 2B → C. The amount of product formed by starting the reaction with 5 mole A and 8 mole B is :-

A
5

B
4

C
3

D
6

Solution
Question 10
4 / -1

Which and what amount will remain unreacted after the reaction between 3g carbon and 2g oxygen to produce CO.

A
1.5 g C

B
0.5 g O₂

C
1 g O₂

D
0.5 g C

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Chemistry Test 101

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Chemistry Test 101

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Question 1

700 g

500 g

100 g

10 g

Question 2

3 NA

30 NA

2 NA

24 NA

Question 3

1.66 × 10–24 g

3.3 × 10–24 g

2 g

0.8 × 10–24 g

Question 4

NO

N2O3

N2O5

NO2

Solution

Question 5

0.1

0.2

0.5

0.7

Solution

Question 6

3 L

13 L

6.5 L

6 L

Solution

Question 7

100 L

20 L

40 L

50 L

Question 8

10

9

18

24

Solution

Question 9

5

4

3

6

Solution

Question 10

1.5 g C

0.5 g O2

1 g O2

0.5 g C

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3 N_A

30 N_A

2 N_A

24 N_A

1.66 × 10^–24 g

3.3 × 10^–24 g

0.8 × 10^–24 g

N₂O₃

N₂O₅

NO₂

0.5 g O₂

1 g O₂