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प्रश्न
Define the following term:
Efflorescence
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उत्तर
It is the phenomenon by which hydrated salts, on exposure to dry air, lose their water of crystallization and crumble to powder.
संबंधित प्रश्न
From the list of the following salts choose the salt that most appropriately fits the
description is given in the following:
[AgCl, MgCl2, NaHSO4, PbCO3, ZnCO3, KNO3, Ca(NO3)2]
On heating this salt, a brown colored gas is evolved.
The pH of a salt used to make tasty and crispy pakoras is 14. Identify the salt and write a chemical equation for its formation. List its two uses.
Write the chemical name and formula of common salt.
Give any two uses of common salt (sodium chloride).
Explain how anhydrous copper sulphate can be used to detect the presence of moisture (water) in a liquid
What happens when a few drops of water are added to anhydrous copper sulphate? Explain with the help of an equation.
What is a salt?
What is meant by 'a family of salts'? Explain with examples.
Write the names, formulae and colours of any two hydrated salts.
Consider the following salts:
Na2CO3, NaCl, NH4Cl, CH3COONa, K2SO4, (NH4)2SO4
Which of salts will give:
acidic solutions?
Consider the following salts:
Na2CO3, NaCl, NH4Cl, CH3COONa, K2SO4, (NH4)2SO4
Which of salts will give:
neutral solutions?
You are asked to prepare hard water in your laboratory. Select a group from the following groups of salts, any salt of which you may dissolve in distilled water to obtain hard water.
(A) NaCl; Na2SO4; KCl
(B) NaCl; CaCl2; KCl
(C) CaCl2; CaSO4; MgSO4
(D) Na2SO4; CaSO4; MgSO4
Name the particles present in :
Strong electrolyte
Answer the questions below relating your answers only to salts in the following list: Sodium chloride, anhydrous calcium chloride, copper sulphate-5-water?
- What name is given to the water in the compound copper sulphate-5-water?
- If copper sulphate-5-water is heated, anhydrous coppersulphate is formed. What is its colour?
- By what means, other than healing, could you dehydrate copper sulphate-5-water and obtain anhydrous coppersulphate?
- Which one of the salts in the given list is deliquescent?
Name two carbonates which do not produce carbon dioxide on heating.
Distinguish by a chemical test sodium carbonate and sodium sulphite.
Identify the following substance:
Gas C has an offensive smell like rotten eggs.
Differentiate hydrate and anhydrous salts with examples.
Write any five uses of salts.
One of the constituents of baking powder is sodium hydrogencarbonate. The other constituent is :
