Some Basic Concepts of Chemistry Test

Result

Some Basic Concepts of Chemistry Test - 12

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Weekly Quiz Competition

Question 1
4 / -1

Two oxides of a metal ‘M’ contain 27.6% and 30.0% of oxygen respectively. If the formula of the first oxide is M₃O₄ , find that of the second.

A
M₂O₃

B
M₂O

C
MO₂

D
M₃O₂

Solution
Question 2
4 / -1

Naturally occuring Boron consists of two isotopes having atomic masses 10.01 and 11.01 respectively.Calculate the percentage of both the isotopes in natural Boron (Atomic mass of natural Boron = 10.81)

A
20% and 80%

B
80% and 20%

C
25% and 75%

D
75% and 25%

Solution
Question 3
4 / -1

Calculate the mass percent of Na and S in sodium sulphate.

A
Na = 16.2%, S = 22.54%

B
Na = 32.39%, S = 11.26%

C
Na = 22.54%, S = 32.39%

D
Na = 32.39%, S = 22.54%
Question 4
4 / -1

Determine the empirical formula of an oxide of iron which has 69.9% iron and 30.1% oxygen by mass.

A
FeO

B
Fe₂O₃

C
Fe₃O₄

D
Fe₃O₂
Question 5
4 / -1

Calculate the concentration of nitric acid in moles per litre which has a density , 1.41 g/mL. %w/w of nitric acid is

A
15.44M

B
0.064M

C
0.077M

D
12.87M

Solution
Question 6
4 / -1

Calculate the number of sulphate ions in 100mL of 0.001M ammonium sulphate solution.

A
6.022 × 10^-19

B
6.022 × 10¹⁹

C
6.022 × 10²⁰

D
6.022 × 10^-20

Solution
Question 7
4 / -1

Some statements are given below based on the pictures. Identify true and false statements.

A
FTTT

B
TTTT

C
TTFT

D
FTFT
Question 8
4 / -1

An aqueous solution of 6.3g oxalic acid dihydrate is made upto 250 mL. The volume of 0.1 N NaOH required to completely neutralize 10 mL of this solution is

A
40 mL

B
20 mL

C
10 mL

D
4 mL

Solution
Question 9
4 / -1

The pair of the compounds in which both the metals are in the highest possible oxidation state is

A

B

C

D

Solution
Question 10
4 / -1

In the analysis of 0.0500 g sample of feldspar, a mixture of the chlorides of sodium and potassium is obtained, which weighs 0.1180 g. Subsequent treatment of the mixed chlorides with silver nitrate gives 0.2451 g of silver chloride. What is the percentage of a sodium oxide and potassium oxide in feldspar ?

A
10.62% Na₂O , 3.58% K₂O

B
3.58% Na₂O , 10.62% K₂O

C
10.62% Na₂O , 35.8% K₂O

D
35.8% Na₂O , 10.62% K₂O

Solution