Some Basic Concepts of Chemistry Test

Result

Some Basic Concepts of Chemistry Test - 24

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Question 1
4 / -1

A 5.82 g silver coin is dissolved in nitric acid. When sodium chloride is added to the solution, all the silver is precipitated as AgCl. The AgCl precipitate weighs 7,20 g. The percentage of silver in the coin is

A
60.3%

B
80%

C
93.1%

D
70%

Solution
Question 2
4 / -1

If 20 g of CaCO₃ is treated with 100 mL of 20% HCl solution, the amount of CO₂ produced is

A
22.4 L

B
8.80 g

C
4.40 g

D
2.24 L

Solution
Question 3
4 / -1

5 moles of Ba(OH)₂ are treated with excess of CO₂. How much BaCO₃ will be formed?

A
39.4 g

B
197 g

C
591 g

D
985 g

Solution
Question 4
4 / -1

20 mL of methane is completely burnt using 50 mL of oxygen. The volume of the gas left after cooling at room temperature is

A
40 mL

B
60 mL

C
30 mL

D
80 mL

Solution
Question 5
4 / -1

The mass of potassium dichromate crystals required to oxidise 750 cm³ of 0.6 M Mohr's salt solution is (Given, molar mass : potassium dichromate = 294, Mohr's salt = 392)

A
0.49 g

B
0.45 g

C
22.05 g

D
2.2 g

Solution
Question 6
4 / -1

Stoichiometric ratio of sodium dihydrogen orthophosphate and sodium hydrogen orthophosphate required for synthesis of Na₅P₃O₁₀ is

A
1.5 : 3

B
3 : 1.5

C
1 : 1

D
2 : 3

Solution
Question 7
4 / -1

A mixture of CaCl₂ and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all the Ca²⁺ ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56 g of CaO. The percentage of NaCl in the mixture (atomic mass of Ca=40) is

A
75

B
30.6

C
25

D
69.4

Solution
Question 8
4 / -1

An aqueous solution containing 6.5 g of NaCl of 90% purity was subjected to electrolysis. After the complete electrolysis, the solution was evaporated to get solid NaOH. The volume of 1 M acetic acid required to neutralise NaOH obtained above is

A
1000 cm³

B
2000 cm³

C
100 cm³

D
200 cm³

Solution
Question 9
4 / -1

Excess of carbon dioxide is passed through 50 mL of 0.5 M calcium hydroxide solution. After the completion of the reaction, the solution was evaporated to dryness. The solid calcium carbonate was completely neutralised with 0.1 N hydrochloric acid. The volume of hydrochloric acid required is (atomic mass of calcium = 40)

A
300 cm³

B
200 cm³

C
500 cm³

D
400 cm³

Solution
Question 10
4 / -1

Amount of oxalic acid present in a solution can be determined by its titration with KMnO₄ solution in the presence of H₂SO₄. The titration gives unsatisfactory result when carried out in the presence of HCl because HCl

A
gets oxidised by oxalic acid to chlorine

B
furnishes H⁺ ions in addition to those from oxalic acid

C
reduces permanganate to Mn²⁺

D
oxidises oxalic acid to carbon dioxide and water

Solution