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Ethanoic Acid or Acetic Acid

Which of the ...

Question

Which of the following statements are correct?

a. Carbonic acid is an inorganic acid.
b. Acid reacts with base to form hydrogen gas.
c. Bases turn china rose indicator blue.
d. Citric acid is an organic acid.

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Solution

a. Inorganic acids are those which are derived from rocks and minerals. Eg- sulphuric acid, phosphoric acid, carbonic acid, etc.
b. Acid reacts with base to form salt and water.
c. Bases turn china rose indicator green or yellow.
d. Organic acids are those which are derived from natural sources. Eg- citric acid, acetic acid, formic acid, tartaric acid, lactic acid, etc.

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Q. Rewrite the following by choosing the correct word from each pair in brackets.
Acids are compounds that contain (hydrogen/sulphur) atoms. Sulphuric acid is one such example. It is a (strong/weak) acid. It can be neutralised by (acids/alkalis) to form salts called (sulphites/sulphates).
Many (metals/non-metals) react with acids to give a gas called (hydrogen/oxygen). Acid also react with (carbonates/hydroxides) to give (hydrogen/carbon dioxide) gas.
Phenolphthalein turns (pink/colourless) in acids, while litmus turns (red/blue).

One of the following is not an organic acid. This is :

(a) ethanoic acid

(b) formic acid

(c) citric acid

(d) carbonic acid

Q. Consider the following statements :

(A) Both acids and bases change the colour of all indicators.
(B) If an indicator gives a colour change with an acid, it does not give a change with a base.
(C) If an indicator changes colour with a base, it does not change colour with an acid.
(D) Change of colour in an acid and a base depends on the type of the indicator.

Which of these statements are correct?

Q. Indicate if the following statements are true or false.
(a) Oxides of non-metals dissolve in water to form some acids.
(b) Sulphites are salts formed from sulphuric acid.
(c) Phosphoric acid is tribasic.
(d) Nitric acid can only form normal salts.
(e) Hydrochloric acid can form both carbonates and bicarbonate.
(f) Carbonic acid can form both carbonates and bicarbonates.
(g) Water of crystallisation is found in anhydrous salts.
(h) Litmus turns red in the presence of alkalis.
(i) An acid reacts with a carbonate to form a salt, and hydrogen gas is obtained.
(j) Acid taste sweet.
(k) When the metal zinc reacts with hydrochloric acid, a salt called zinc chloride is formed.
(l) when metals react directly with acids, the reaction is called a displacement reaction.
(m) Sulphuric acid has the formula H₂SO₃.
(n) Carbon dioxide gas is given off as a result of displacement reactions between acids and metals.

Q. Write T for the true statement and F for the false one. Correct the false statement(s).

1. Hydrochloric acid, nitric acid, and sulphuric acid are called organic acids.
2. Acids are bitter to taste.
3. The chemical name of washing soda is sodium bicarbonate.
4. When you use litmus as an indicator, it gives the colour red for bases.
5. A salt is formed by the neutralization of an acid with water.

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