12.Introduction to Acid & Base

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1. substances acquire sour taste due to the presence of a typical compound in them. Such compounds imparting sour taste are called -------------- 1) Base 2) Indicator 3) Acid 4) Salt

2. Which of the following is not ‘mineral acid’ 1) sulphuric acid 2) Lime water 3) hydrochloric acid 4) nitric acid

3. The substances which change their colours in presence of acid or base are called ---------------- 1) Acid 2) Indicator 3) Salt 4) Base

4. which is incorrect statement? 1) Blue litmus paper turns red on dipping in acid 2) All of these 3) red litmus turns blue by alkali. 4) Blue litmus paper turns red on dipping in Base Solution.

5. Which of the following is used to prepared Natural indicator ? 1) All of these 2) hibiscus and rose 3) red cabbage 4) radish

6. In which of the following solution Orage colour of methyl orange turns pink? 1) Salt 2) Acid 3) alkali solution 4) None of these

7. which is correct pair? 1) Orange-Acetic acid 2) Tamarind-Citric acid 3) Tomato-Oxalic acid 4) Vinegar-Tartaric acid

8. which is correct about acid. 1) Blue litmus turns red in acid 2) Acids are sour in taste 3) Acid reacts with metal to form hydrogen gas 4) Acids are slippery 1) Statements 1,2 and 3 2) Statements 2,3 and 4 3) Statements 1,2 and 4 4) Statements 1,2 ,3 and 4

9. Which acid is present in our stomach? 1) nitric acid 2) sulphuric acid 3) Citric acid 4) Hydrochloric acid

10. Which of the following contain in Acidity resistant medicines. (Antacids) 1) Ammonium hydroxide 2) Sodium hydroxide 3) Magnesium hydroxid 4) Potassium hydroxide

11. whichof the following statement is incorrect? 1) Alkali has bitter taste. 2) Alkali contains hydrogen ion (H+) as a main constituent 3) Salt and water are formed by combination of acid and alkali. 4) Metal oxides are generally alkaline in nature.