Column I | Column II | ||
A. | Tartaric acid | 1. | Red ants |
B. | Formic acid | 2. | Grapes |
C. | Uric acid | 3. | Apples |
D. | Maleic acid | 4. | Urine of mammals |
Column I | Column II | ||
A. | \[{{10}^{-7}}\] | 1. | pH value of neutral solution |
B. | \[>7\] | 2. | pH value of acidic solution |
C. | \[<7\] | 3. | pH value of alkaline solution |
D. | 7 | 4. | In pure ion concentration |
Consider the following statements |
1. Acids are sour in taste and change the colour of blue litmus to red. |
2. Bases are bitter and change the colour of red litmus to blue. |
3. Litmus is a natural indicator. |
Which of the statements above are correct? |
Study the following statements |
1. Litmus solution is a purple dye which is extracted from lichen and is commonly used as an indicator. |
2. Red cabbage leaves, turmeric, coloured petals of some flowers indicate the presence of acid or base in a solution. |
3. Some substances whose odour changes in acidic or basic medium are called olfactory indicators. |
Which of the statements given above are correct? |
Which of the following statements is correct about an aqueous solution of an acid and of a base? |
(i) Higher the pH, strong the acid |
(ii) Higher the pH, weaker the acid |
(iii) Lower the pH, stronger the base |
(iv) Lower the pH, weaker the base |
Column I | Column II | ||
A. | 7.35 to 7.45 | 1. | Milk |
B. | 6.6 | 2. | Human blood |
C. | 8.5 | 3. | Wine |
D. | 2.8 | 4. | Sea water |
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