Advertisements
Advertisements
Question
Define the following term:
Hygroscopy
Advertisements
Solution
It is the phenomenon by which substances absorb moisture from air, but only sufficiently so as to become wet.
RELATED QUESTIONS
Write a balanced equation for the preparation of the following salts:
Zinc carbonate from Zinc sulphate
What name is given to the common salt which is mined from underground deposits? How was this salt formed?
How would you show that blue copper sulphate crystals contain water of crystallisation?
What happens when a few drops of water are added to anhydrous copper sulphate? Explain with the help of an equation.
What happens when a concentrated solution of sodium chloride (brine) is electrolysed? Write the equation of the reaction involved.
Name three products of the chlor-alkali process. State two uses of each of these products.
P and Q are aqueous solutions of sodium chloride and sodium hydroxide, respectively. Which of these will turn:
(a) blue litmus red?
P and Q are aqueous solutions of sodium chloride and sodium hydroxide, respectively. Which of these will turn:
red litmus blue?
Consider the following salts:
Na2CO3, NaCl, NH4Cl, CH3COONa, K2SO4, (NH4)2SO4
Which of these salts will give:
basic solutions (or alkaline solutions)?
name two salts which are basic.
name two salts which are neutral, when dissolved in water.
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
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?
Copy and complete the following table which refers to the action of heat on some carbonates:
| Carbonate | Colour of residue on cooling |
| Zinc Carbonate | |
| Lead carbonate | |
| Copper carbonate |
Distinguish by a chemical test sodium carbonate and sodium sulphite.
Sodium carbonate is a basic salt because it is a salt of a ____________.
Which of the following is not an acidic salt?
Select the correct answer from A, B, C, D and E.
A compound which in the aqueous solution state, is neutral in nature.
