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प्रश्न
When phenolphthalein is added to NaOH, the colour of the solution will become _________.
- colourless
- red
- pink
- yellow
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उत्तर
pink
When phenolphthalein is added to NaOH, the colour of the solution will become pink
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संबंधित प्रश्न
Dilute NaOH can be tested with
(a) red litmus paper
(b) blue litmus paper
(c) lime water
(d) Na2CO3
Why do HCl, HNO3, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?
Name one natural source of the following acid:
Lactic acid
Complete and balance the following chemical equation:
\[\ce{Na2CO3_{(s)} + HCl_{(aq)} ->}\]
Name the gas evolved when zinc granules are treated/heated with:
Hydrochloric acid solution
What ions are present in the solutions of following substances? (write the symbols only)
Sulphuric acid
Write the chemical formula of soda ash?
What is the chemical formula of bleaching powder?
Name a metal compound which has detergent properties (cleansing properties).
Read the following statements:
I. When a red litmus paper is dipped into reaction mixture of a saponification reaction, it turns blue and the reaction is exothermic.
II. When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is exothermic.
III. When a red litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is endothermic.
IV. When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is endothermic.
Which of the above statements are correct:
(A) I, and II
(B) II and III
(C) III and IV
(D) I and IV
Explain the following:
Lead carbonate does not react with dilute HCl.
Which of the following are present in a dilute aqueous solution of hydrochloric acid?
What are strong and weak acids? In the following list of acids, separate strong acids from weak acids.
Hydrochloric acid, citric acid, acetic acid, nitric acid, formic acid, sulphuric acid.
A salt may be ______.
Are all acids corrosive in nature? Name a few acids which are non-corrosive and may be part of our food.
Two salts 'X' and 'Y' are dissolved in water separately. When phenolphthalein is added to these two solutions, the solution 'X' turns pink and the solution 'Y' does not show any change in colour, therefore 'X' and 'Y' are:
A substance 'X' is used as a building material and is insoluble in water. When it reacts with dil. HCl, it produces a gas which turns lime water milky.
- Write the chemical name and formula of 'X'.
- Write chemical equations for the chemical reactions involved in the above statements.
The metal that will not produce hydrogen gas when reacted with dilute acids.
Give a balanced equation for the reaction:
Silver nitrate solution and sodium chloride solution.
