Some Basic Concepts of Chemistry Test

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Some Basic Concepts of Chemistry Test - 1

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Weekly Quiz Competition

Question 1
4 / -1

Number of moles of MnO₄ required to oxidize one mole of ferrous oxalate completely in acidic medium will be :

A
0.6 moles

B
0.2 moles

C
7.5 moles

D
0.4 moles
Question 2
4 / -1

Volume occupied by one molecule of water (density = 1 g cm^–3) is :

A
9.0 × 10^–23 cm³

B
6.023 × 10^–23 cm³

C
5.5 × 10^–23 cm³

D
3.0 × 10^–23 cm³
Question 3
4 / -1

An element, X has the following isotopic composition :

A
201 amu

B
202 amu

C
199 amu

D
200 amu
Question 4
4 / -1

The number of moles of KMnO₄ reduced by one mole of KI in alkaline medium is:

A
one

B
two

C
five

D
one fifth
Question 5
4 / -1

The maximum number of molecules is present in

A
15 L of H₂ gas at STP

B
5 L of N₂ gas at STP

C
0.5 g of H₂ gas

D
10 g of O₂ gas
Question 6
4 / -1

If N_A is Avogadro’s number then number of valence electrons in 4.2g of nitride ions (N^3–) is

A
2.4 N_A

B
4.2 N_A

C
1.6 N_A

D
3.2 N_A
Question 7
4 / -1

The number of oxygen atoms in 4.4 g of CO₂ is

A
1.2 × 10²³

B
6 × 10²²

C
6 × 10²³

D
12 × 10²³
Question 8
4 / -1

The same amount of Zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide. What will be the ratio of volumes of hydrogen evolved ?

A
1 : 1

B
1 : 2

C
2 : 1

D
9 : 4

Solution
Question 9
4 / -1

2.76 g of silver carbonate on being strongly heated yields a residue weighing

A
2.16g

B
2.48 g

C
2.32 g

D
2.64 g

Solution
Question 10
4 / -1

The molecular weight of O₂ and SO₂ are 32 and 64 respectively. At 15°C and 150 mm Hg pressure, one litre of O₂ contains ‘N’ molecules. The number of molecules in two litres of SO₂ under the same conditions of temperature and pressure will be :

A
N/2

B
N

C
2N

D
4N

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Some Basic Concepts of Chemistry Test - 1

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Question 1

0.6 moles

0.2 moles

7.5 moles

0.4 moles

Question 2

9.0 × 10–23 cm3

6.023 × 10–23 cm3

5.5 × 10–23 cm3

3.0 × 10–23 cm3

Question 3

201 amu

202 amu

199 amu

200 amu

Question 4

one

two

five

one fifth

Question 5

15 L of H2 gas at STP

5 L of N2 gas at STP

0.5 g of H2 gas

10 g of O2 gas

Question 6

2.4 NA

4.2 NA

1.6 NA

3.2 NA

Question 7

1.2 × 1023

6 × 1022

6 × 1023

12 × 1023

Question 8

1 : 1

1 : 2

2 : 1

9 : 4

Solution

Question 9

2.16g

2.48 g

2.32 g

2.64 g

Solution

Question 10

N/2

N

2N

4N

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9.0 × 10^–23 cm³

6.023 × 10^–23 cm³

5.5 × 10^–23 cm³

3.0 × 10^–23 cm³

15 L of H₂ gas at STP

5 L of N₂ gas at STP

0.5 g of H₂ gas

10 g of O₂ gas

2.4 N_A

4.2 N_A

1.6 N_A

3.2 N_A

1.2 × 10²³

6 × 10²²

6 × 10²³

12 × 10²³