The pH values of three solutions A, B and C are given in the table. Answer the following questions:
Solution pH value
A
B
C 12
2
7
(i) Which solution will not affect the litmus solution?
(ii) Which solution will liberate $$CO_2$$ when reacted with sodium carbonate?
(iii) Which solution will turn red litmus solution blue?

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Solution

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(i) C (Because pH=7 indicates neutral solution).
(ii) B (Because acids liberate $$CO_2$$ gas when treated with carbonates and acids have pH less than 7)
(iii) A (Bases turn red litmus blue and they have pH more than 7)

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The pH values of three solutions A, B and C are given in the table. Answer the following questions:

Solution	pH value
A B C	12 2 7

(i) Which solution will not affect the litmus solution?
(ii) Which solution will liberate $$CO_2$$ when reacted with sodium carbonate?
(iii) Which solution will turn red litmus solution blue?

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Two solutions marked ‘A’ and ‘B’ have pH values of 4 and 10 respectively.

Answer the following:

(i) Which one of the two solutions shows acidic nature?

(ii) Which solution will change red litmus to blue?

(iii) Which solution will give a red color with methyl orange?

(iv) Which solution will liberate carbon dioxide from sodium carbonate?

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A. (i) What do you understand by a lone pair of electrons? [1 mark]
(ii) Draw the electron dot diagarm of hydronium ion. (H = 1; O = 8). [1 mark]
B. Explain how polar covalent compound HCl which is a bad conductor in pure and liquid state, ionises in water. [2 marks]
C. The pH value of three solutions A, B and C are given in the table.

Solution	pH Value
A	12
B	2
C	7

Answer the following questions. [3 marks]
(i) Which solution will have no effect on litmus solution?
(ii) Which solution will liberate

C O_{2}

(i) Which element forms electrovalent compound with G?
(ii) The ion of which element will migrate towards the cathode during electrolysis?
(iii) Which non-metallic element has the valency of 2?

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A. (i) What do you understand by a lone pair of electrons? [1 mark]
(ii) Draw the electron dot diagarm of hydronium ion. (H = 1; O = 8). [1 mark]
B. Distinuish between the following pair of compounds based on the reagent given in the bracket. [2 marks]
(i) Ferrous sulphate solution and ferric sulphate solution. (using sodium hydroxide solution)
(ii)Dilute hydrochloric acid and dilute sulphuric acid. (using lead nitrate solution)
C. The pH value of three solutions A, B and C are given in the table.

Solution	pH Value
A	12
B	2
C	7

Answer the following questions. [3 marks]
(i) Which solution will have no effect on litmus solution?
(ii) Which solution will liberate

C O_{2}

(i) Which element forms electrovalent compound with G?
(ii) The ion of which element will migrate towards the cathode during electrolysis?
(iii) Which non-metallic element has the valency of 2?

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A. (i) What is the percentage composition of calcium in calcium nitrate? [1 mark]
(ii) At 27

°

C, a balloon is filled with 3 L air. The volume of the balloon when the temperature is 54

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(i) Ferrous sulphate solution and ferric sulphate solution. (using sodium hydroxide solution)
(ii) Dilute hydrochloric acid and dilute sulphuric acid. (using lead nitrate solution)

C. The pH value of three solutions A, B and C are given in the table.

Solution	pH Value
A	12
B	2
C	7

Answer the following questions. [3 marks]
(i) Which solution will have no effect on litmus solution?
(ii) Which solution will liberate

C O_{2}

when reacted with sodium carbonate?
(iii) Which solution will turn red litmus solution blue?

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(i) Which element forms electrovalent compound with G?
(ii) The ion of which element will migrate towards the cathode during electrolysis?
(iii) Which non-metallic element has the valency of 2?

View Solution

(i) C (Because pH=7 indicates neutral solution).(ii) B (Because acids liberate $$CO_2$$ gas when treated with carbonates and acids have pH less than 7)(iii) A (Bases turn red litmus blue and they have pH more than 7)

(i) C (Because pH=7 indicates neutral solution).
(ii) B (Because acids liberate $$CO_2$$ gas when treated with carbonates and acids have pH less than 7)
(iii) A (Bases turn red litmus blue and they have pH more than 7)