Raghav categorised the following household items into acids and bases.
Acids
Bases
1
Lemon
4
Baking soda
2
Antacid
5
Vinegar
3
Tea
6
Curd
Which of them are placed under the wrong category?
Important Questions on Acids, Bases and Salts
Match column I with column II and select the correct option from the given codes.
| Column I(Salts) | Column II(Uses) | ||
| P. | Baking soda | 1. | In making fire-works |
| Q. | Nitre | 2. | As a fungicide |
| R. | Blue vitriol | 3. | In purification of water |
| S. | Phitkari | 4. | In fire extinguisher |
Sumedha took a spoon of turmeric powder and made a paste by adding little water to it. She cut thin strips of paper and applied this paste to them. After drying, she put a few drops of the given sample solutions (i)-(iv) on these strips. What would be the changes in the colour she observed?
(i) Amla juice
(ii) Lime water
(iii) Common salt solution
(iv) Baking soda solution
| (i) | (ii) | (iii) | (iv) | |
| (A) | Yellow | Red | Yellow | Red |
| (B) | Red | Yellow | Yellow | Red |
| (C) | Red | Red | Yellow | Yellow |
| (D) | Yellow | Yellow | Red | Red |
Statement 1: To neutralise the effect of a bee sting, that portion of the body is rubbed with moist baking soda.
Statement 2: Baking soda contains sodium carbonate which neutralises the effect of acid injected by bee sting.
Which of the following diagram(s) represent(s) alkalis and bases in the correct form?
Observe the given figure carefully and select the incorrect statement(s).
1. Large volume of acid should be added to a small volume of water slowly.
2. The figure represents the process of concentrating dilute .
3. The process involves the release of a large amount of heat.
4. Water should not be stirred.
Match column I with column II and select the correct option from the given codes.
| Column I | Column II | ||
| (P) | Ammonium hydroxide | (i) | Spinach |
| (Q) | Tartaric acid | (ii) | Window cleaner |
| (R) | Zinc carbonate | (iii) | Tamarind |
| (S) | Oxalic acid | (iv) | Calamine |
