Some Basic Concepts of Chemistry & Stoichiometry Test

Result

Some Basic Concepts of Chemistry & Stoichiometry Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is true for the given reaction?

2Al (s) + 6HCl (aq) → 2Al³⁺ (aq) + 6Cl^- (aq) + 3H₂ (g)

A
67.2 litres of H₂(g) at STP is produced for every mole of Al that reacts.

B
11.2 litres H₂ (g) at STP is produced for every mole HCl (aq) consumed.

C
6 litres HCl (aq) is consumed for every 3 litres H₂(g) produced.

D
33.6 litres H₂(g) is produced regardless of the temperature and pressure for every mole of Al that reacts.

Solution

For 6 moles of HCl, 3 moles of H₂ is produced.

So, for one mole, 3 / 6 mole of the H₂ is produced.

Hence, volume of H₂ produced = 1 / 2 × 22.4 = 11.2 litres

33.6 litres of H₂(g) at STP is produced for every mole of Al that reacts. Hence, both the options (1) and (4) are incorrect

The volume ratio is same as the molar ratio only for gaseous species and not for aqueous solutions. Hence the option (3) is also incorrect.
Question 2
1 / -0

Under the same conditions of temperature and pressure, 2 litres of SO₂, 3 litres of chlorine, 6 litres of hydrogen, 5 litres of nitrogen and 4 litres of CO₂ are collected.

Which of the following is the correct arrangement of these gases in increasing order of the number of molecules of the collected gases?

A
H₂ < N₂ < Cl₂ < CO₂ < SO₂

B
H₂ < N₂ < Cl₂ < SO₂ < CO₂

C
SO₂ < CO₂ < Cl₂ < N₂ < H₂

D
SO₂ < Cl₂ < CO₂ < N₂ < H₂

Solution

According to Avogadro`s law, all gases under similar conditions of temperature and pressure contain the same number of molecules.

∴ As the volume of gas is increased, the number of moles of the gas and hence the number of molecules also increases.
Question 3
1 / -0

The Celsius and Fahrenheit temperatures corresponding to 64.15 K respectively are

A
– 209°C, – 344.2°F

B
– 20.9°C, 34.4°F

C
209°C, 344.2°F

D
20.9°C, 34.4°F

Solution

t_C = (64.15 – 273.15)°C = –209°C;

t_F = {(– 209 1.8) + 32}°F = –344.2°F