Some Basic Concepts of Chemistry Test

Result

Some Basic Concepts of Chemistry Test - 8

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Weekly Quiz Competition

Question 1
4 / -1

If N_A is Avogadro’s number then number of valence electrons in 4.2 g 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

Solution
Question 2
4 / -1

A
1

B
2

C
3

D
4

Solution
Question 3
4 / -1

Two containers P and Q of equal volume (1litre each) contain 6g of O₂ and SO₂ respectively at 300 K Then

A
Number of molecules in P is less than that in Q

B
Number of molecules in Q is less than that in P

C
Number of molecules in P and Q are same

D
Either (1) or (2)

Solution
Question 4
4 / -1

The number of moles of oxygen in one litre of air containing 21% oxygen by volume, in standard conditions, is :

A
0.186 mole

B
0.21 mole

C
2.10 mole

D
0.0093 mole

Solution
Question 5
4 / -1

Dimensions of pressure are same as that of

A
Energy

B
Force

C
Energy per unit volume

D
Force per unit volume

Solution
Question 6
4 / -1

The amount of zinc required to produce 224 ml of H₂ at STP on treatment with dil.H₂SO₄ will be

A
0.65 g

B
6.5 g

C
65 g

D
0.065g

Solution
Question 7
4 / -1

Given the numbers: 161cm, 0.161 cm, 0.0161cm. The number of significant figures for the three numbers are

A
3, 4 and 5 respectively

B
3, 3 and 3 respectively

C
3, 3 and 4 respectively

D
3, 4 and 4 respectively
Question 8
4 / -1

A molal solution is one that contains 1 mole of a solute in

A
1000 g of the solvent

B
one litre of the solvent

C
one litre of the solution

D
22.4 litres of the solution
Question 9
4 / -1

One mole of calcium phosphide on reaction with excess of water gives

A
one mole of phosphine

B
two moles of phosphoric acid

C
two moles of phosphine

D
one mole of phosphorus pentoxide

Solution
Question 10
4 / -1

Assuming fully decomposed, the volume of CO₂ released at STP on heating 9.85 g of BaCO₃ (Atomic mass , Ba =137) will be

A
0.84 L

B
2.24 L

C
4.06 L

D
1.12 L

Solution