Q26 of 48 Page 9

Equal volumes of hydrochloric acid and sodium hydroxide solution of same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the colour obtained? (You may use colour guide given in figure of NCERT Book (Science Class X) on page 26).

When equal volumes of hydrochloric acid (strong acid) and sodium hydroxide (strong base) solution of same concentration are mixed, the result is salt and water. This is a neutralisation reaction.



The aqueous solution of NaCl is neutral with pH 7. The colour of this solution obtained is yellowish green.

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24

Which of the following statements is not correct?

 25

Match the chemical substances given in column I with their appropriate application given in Column II.























Column I



Column II



A. Bleaching powder



1. Preparation of glass



B. Baking soda



2. Production of H2and Cl2



C. Washing soda



3. Decolourisation



D. Sodium chloride



4. Antacid



Codes


A B C D A B C D

 27

Which of the following is/are true when HCl (g) is passed through water?

(i) It does not ionise in the solution as it is a covalent compound.


(ii) It ionises in the solution.


(iii) It gives both hydrogen and hydroxyl ion in the solution.


(iv) It forms hydronium ion in the solution due to the combination of hydrogen ion with a water molecule.

 28

Which of the following statement is true for acids?