If 2 g of aluminium is treated, first with excess of dilute H₂SO₄ and then
If 2 g of aluminium is treated, first with excess of dilute H₂SO₄ and then with excess of NaOH, the ratio of the volumes of hydrogen evolved is
Options
(a) 1:1 (b) 1:2 […]
Questions
Chemical A is used for water softening to remove temporary hardness.
Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda.When CO₂ is bubbled through A, it turns cloudy. what is A?
Options
(a) […]
If a given sample of water contains 0.06 g of Ca²⁺ ion per kg, calculate
If a given sample of water contains 0.06 g of Ca²⁺ ion per kg, calculate the ppm level of Ca²⁺ ions
Options
(a) 0.6 (b) 60 (c) 6 (d) 600
Correct Answer:
60
Calculate the amount of [Ca(OH)₂] required to remove the hardness of water
Calculate the amount of [Ca(OH)₂] required to remove the hardness of water from 60,000 litres containing 16.2 g of Ca(HCO₃)₂ per 100 litre
Options
(a) 1.11 kg (b) 2.22 kg (c) 3.33 kg […]
5 g of hydrogen peroxide is present in 56 mL of solution. The solution
5 g of hydrogen peroxide is present in 56 mL of solution. The solution will correspond to
Options
(a) 10 volume (b) 20 volume (c) 30 volume (d) 1.57 volume
Correct Answer:
30 […]
Hardness of water due to presence of salts of
Hardness of water due to presence of salts of
Options
(a) Na⁺ and K⁺ (b) Ca²⁺ and Mg²⁺ (c) Ca²⁺ and K⁺ (d) Ca²⁺ and Na⁺
Correct Answer:
Ca²⁺ and Mg²⁺
Explanation:
No […]
Position of hydrogen in periodic table is such that it can be placed in
Position of hydrogen in periodic table is such that it can be placed in
Options
(a) both 1st and 17th group (b) only 1st group (c) only 17th group (d) neither in 1st […]
In which of the following reaction, the hydrogen peroxide is a reducing agent?
In which of the following reaction, the hydrogen peroxide is a reducing agent?
Options
(a) 2HI + H₂O₂ → 2H₂O + I₂ (b) CI₂ + H₂O₂ → 2HCl + O₂ (c) 2FeCl₂ + […]
In the reaction of H₂O₂ with acidified KMnO₄
In the reaction of H₂O₂ with acidified KMnO₄
Options
(a) H₂O₂ acts as a oxidising agent (b) H₂O₂ acts as a reducing agent (c) KMnO₄ acts as a reducing agent (d) H₂SO₄ acts […]
In the softening of the water by passing it through cationic and anionic exchang
In the softening of the water by passing it through cationic and anionic exchange resins, when water is passed only through the cation exchanger
Options
(a) only permanent hardness is removed (b) the […]