81. Which of the following liquids has the highest pH?
82. If a solution changes the colour of blue litmus paper to red, what will the pH of this solution be?
83. The color of inactive litmus solution is . . . . . . . .
84. Select the incorrect statement regarding potash alum.
85. Litmus solution is derived from . . . . . . . .
86. Match List I with List II.
List-I
List-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 water hydrogen ion concentration
| List-I | List-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 water hydrogen ion concentration |
87. 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 given above is/are correct?
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 given above is/are correct?
88. The chemical formula of baking soda is
89. The pH value of neutral solution is . . . . . . . .?
90. Fill in the blanks with appropriate options. . . . . . . . . turns blue litmus into red and . . . . . . . ., turns . . . . . . . . litmus to blue
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