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Deepak Rock
@deepak-rock
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Joined: Aug 6, 2021
Last seen: Sep 10, 2021
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Topics: 1742 / Replies: 303
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Topic
The metal salt A is blue in colour. When salt A is heated strongly over a burner, then a substance B is eliminated and a white powder C is left behind.
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 340
Topic
P and Q are aqueous solutions of sodium chloride and sodium hydroxide, respectively. Which of these will turn: (a) blue litmus red? (b) red litmus blue?
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 165
Topic
What is salt? Give the names and formulae of any two salts. Also, name the acids and bases from which these salts may be obtained. (b) What is meant by ‘a family of salts’? Explain with examples.
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 462
Topic
What is plaster of Paris? Write the chemical formula of plaster of Paris. (b) How is plaster of Paris prepared? Write chemical equation of the reaction involved.
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 302
Topic
What is bleaching powder? How is bleaching powder prepared? Write chemical equation of the reaction involved in the preparation of bleaching powder. (b) What happens when bleaching powder reacts with dilute sulphuric acid?
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 180
Topic
Describe how washing soda is produced starting from sodium chloride (common salt). Write equations of all the reactions involved. (b) State whether an aqueous solution of washing soda is acidic or alkaline? Give reason for your answer.
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 332
Topic
What happens when a concentrated solution of sodium chloride (brine) is electrolysed? Write the equation of the reaction involved.
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 233
Topic
What is the common name of the compound CaOCl2? (b) Name the raw material used for the preparation of plaster of Paris.
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 391
Topic
State two uses each of the following compounds: (a) Sodium hydroxide (b) Chlorine (c) Hydrogen (d) Hydrochloric acid
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 316
Topic
What is “baking powder”? How does it make the cake soft and spongy? (b) In addition to sodium hydrogen carbonate, baking powders contain a substance X. Name the substance X.
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 237
Topic
What is gypsum? What happens when gypsum is heated to 100°C (373 K)? (b) Name a sodium compound which is used for making borax and glass.
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 185
Topic
Name a sodium compound used for softening hard water. (b) Which compound of calcium is used for disinfecting drinking water supply?
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 209
Topic
What does a soda-acid-type fire extinguisher contain? How does it work? Explain the working of a soda-acid fire extinguisher with the help of a labelled diagram.
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 403
Topic
What is the chemical name of bleaching powder? (b) What is the chemical formula of bleaching powder?
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 299
Topic
Name two constituents of baking powder. (b) How does baking powder differ from baking soda? (c) Explain the action of baking powder in the making of cake (or bread). Write equation of the reaction involved.
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 385
Topic
What happens when copper sulphate crystals are heated strongly? Explain with the help of an equation. (b) What happens when a few drops of water are added to anhydrous copper sulphate? Explain with the help of an equation.
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 192
Topic
What will happen if heating is not controlled while preparing plaster of Paris? (b) Write an equation to show the reaction between plaster of Paris and water.
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 133
Topic
What is the common name of sodium hydrogen carbonate? (b) What happens when a solution of sodium hydrogen carbonate is heated? Write equation of the reaction involved.
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 204
Topic
What is meant by “water of crystallisation” in a substance? Explain with an example. (b) How would you show that blue copper sulphate crystals contain water of crystallisation?
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 241
Topic
What happens when a cold and concentrated solution of sodium chloride reacts with ammonia and carbon dioxide? Write the chemical equation of the reaction which takes place.
3 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 113
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