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:
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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) […]
Limestone is not used in which of the following manufacturing processes
Options
(a) Phosphorus from phosphorite (b) Ordinary (soda lime) glass (c) Iron from haematite (d) Solvay process of sodium carbonate
Correct Answer: […]
The s-block element used as a catalyst in the manufacture of Buna-S rubber is
Options
(a) Mg (b) Ca (c) Ba (d) Na
Correct Answer:
Na
Explanation:
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For alkali metals, which one of the following trends is incorrect
Options
(a) Hydration energy: Li > Na > K > Rb (b) Ionization energy: Li > Na > K > Rb (c) […]
The characteristic not related to alkali metals is
Options
(a) their ions are isoelectronic with noble gas (b) low melting point (c) low electronegativity (d) higher ionisation energy
Correct Answer:
higher ionisation energy
In a lime kiln, to get higher yield of CO₂, the measure that can be taken is
Options
(a) to remove CaO (b) to add more CaCo₃ (c) to maintain higher temperature (d) […]
Excess of Na⁺ ions in air system causes
Options
(a) diabetes (b) anaemia (c) high blood pressure (d) low blood pressure
Correct Answer:
high blood pressure
Explanation:
No explanation available. Be the first […]
Solution of sodium metals in liquid ammonia strongly reduces due to the presence in which of the following solution
Options
(a) Sodium hydride (b) Sodium amide (c) Solvated electrons (d) Sodium atoms
Correct […]
When sodium bicarbonate is heated strongly for calcined in a Kiln, it forms
Options
(a) NaCO₃ (b) Na (c) NaHCO₃ (d) Na₂CO₃
Correct Answer:
Na₂CO₃
Explanation:
No explanation available. Be the first to […]
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