Which of the following is not a neutralization reaction?
  •  NaOH + HCl → NaCl + H2O
  • H+ + OH– → H2O

  • Na2CO3 + H2SO→ Na2SO4 + H2O + CO2
  • AgNO3 + HCl → AgCl + HNO3

D.

AgNO3 + HCl → AgCl + HNO3
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Select the mineral acid among the following:
  • acetic acid
  • citric acid
  • hydrochloric acid
  • lactic acid

C.

hydrochloric acid
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During the manufacture of sodium carbonate by Solvay process, material consumed are:
  • sodium chloride and limestone
  • sodium chloride and ammonia
  • limestone, ammonia and sodium chloride
  • limestone, ammonia, sodium chloride and carbon dioxide

A.

sodium chloride and limestone
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Give two physical characteristics each of acids and bases.


Acids are,
(i) sour in taste.
(ii) change the colour of blue litmus to red.

Bases are,
(i) bitter in taste.
(ii) change the colour of red litmus to blue.

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What are indicators? Name four acid-base indicators and mention their colour change.

Indicators are chemical substances which give different colours in acidic or basic solutions.

(i) Methyl orange gives pink colour with acid solution and yellow colour with base solution.

(ii) Phenolphthalein is colourless in acid solution while it turns into pink colour in base solution.

(iii) Litmus solution turns red in acid solution and blue in base solution.

(iv) Bromothymol blue is blue in base solution and is yellow in acid solution.

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