Some Basic Concepts of Chemistry Test

Result

Some Basic Concepts of Chemistry Test - 19

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Weekly Quiz Competition

Question 1
4 / -1

The value of amu is which of the following ?

A
1.57 x 10^-24 kg

B
1.66 x 10^-24 kg

C
1.99 x 10^-25 kg

D
1.66 x 10^-27 kg

Solution
Question 2
4 / -1

How many moles of magnesium phosphate, Mg₃ (PO₄)₂ will contain 0.25 mole of oxygen atoms ?

A
0.02

B
3.125 x 10^-2

C
1.25 x 10^-3

D
2.5 x 10^-2

Solution
Question 3
4 / -1

The mass of 112 cm³ of CH₄ gas at STP is

A
0.16 g

B
0.8 g

C
0.08 g

D
1.6 g

Solution
Question 4
4 / -1

The total number of protons in 10 g of calcium carbonate is
(N₀ = 6.023 x 10²³)

A
3.01 x 10²⁴

B
4.06 x 10²⁴

C
2.01 x 10²⁴

D
3.02 x 10²⁴

Solution
Question 5
4 / -1

The mass of 1 mole of electrons is

A
9.1 x 10^-28 g

B
1.008 mg

C
0.55 mg

D
9.1 x 10^-27 g

Solution
Question 6
4 / -1

Which of the following is correct for
C(graphite) + O₂ → CO₂ , Heat = - 348 kJ ?

A
Heat absorbed

B
Mass of product > Mass of reactant

C
Mass of product < Mass of reactant

D
Mass of product = Mass of reactant

Solution
Question 7
4 / -1

A signature, written in carbon pencil weighs 1 mg. What is the number of carbon atoms present in the signature ?

A
5.02 x 10²³

B
5.02 x 10²⁰

C
6.02 x 10²⁰

D
0.502 x 10²⁰

Solution
Question 8
4 / -1

How many moles of Al₂ (SO₄)₃ would be in 50 g of the substance ?

A
0.083 mol

B
0.952 mol

C
0.481 mol

D
0.140 mol

Solution
Question 9
4 / -1

The number of molecules of CO₂ present in 44 g of CO₂ is

A
6.0 × 10²³

B
3 × 10²³

C
12 × 10²³

D
3 × 10¹⁰

Solution
Question 10
4 / -1

2 g of O₂ at 0^oC and 760 mm of Hg pressure has volume

A
1.4 L

B
2.8 L

C
11.2 L

D
22.4 L

Solution