Which of the following metal is not manufactured by electrolysis
Options
(a) Na (b) Mg (c) Al (d) Fe
Correct Answer:
Fe
Explanation:
No explanation available. Be the first to write the explanation […]
For which one of the following minerals, the composition given is incorrect
Options
(a) Glauber’s salt – Na₂SO₄.10H₂O (b) Borax – Na₂B₄O₇.7H₂O (c) Carnallite – KCl.MgCl₂.6H₂O (d) soda ash- Na₂CO₃
Correct Answer:
Borax […]
The following composition is known as “Bordeaux mixture”.
Options
(a) Borax and copper sulphate (b) Orthoboric acid and ferrous sulphate (c) Sodium borate and zinc sulphate (d) Copper sulphate and lime
Correct Answer: […]
Dead burnt plaster is
Options
(a) CaSO₄.2H₂O (b) MgSO₄.7H₂O (c) CaSO₄.1/2H₂O (d) CaSO₄
Correct Answer:
CaSO₄
Explanation:
No explanation available. Be the first to write the explanation for this question by commenting […]
When a standard solution of NaOH is left in air for a few hours
Options
(a) a precipitate will form (b) strength will decrease (c) strength will increase (d) the concentration of Na⁺ […]
Which of the following materials is used in high temperature thermometers
Options
(a) Crystalline sodium chloride (b) Molten aluminium (c) Sodium amalgam (d) Alloy of sodium and potassium
Correct Answer:
Alloy of sodium […]
As the alkaline earth metals (except Be) tend to lose their valence electrons readily they act as
Options
(a) weak oxidising agent (b) weak reducing agent (c) strong oxidising agent (d) strong reducing […]
The process used for the extraction of sodium is called
Options
(a) Serpeck’s process (b) Baeyer’s process (c) Down’s process (d) Thermite process
Correct Answer:
Down’s process
Explanation:
No explanation available. Be the […]
The substance that causes temporary hardness in water is
Options
(a) CaCO₃ (b) MgCO₃ (c) CaSO₄ (d) Mg(HCO₃)₂
Correct Answer:
Mg(HCO₃)₂
Explanation:
No explanation available. Be the first to write the explanation for […]
The increasing order of atomic radius for the elements Na, Rb, K and Mg is
Options
(a) Na < K < Mg < Rb (b) K < Na < Mg < Rb (c) […]
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