71. In universal indicators, what does a pH value of 4 to 5 indicate?
72. What is the chemical name of saltpetre?
73. The hypo soIution used in photography is an aqueous solution of
74. Which of the following options is different from the other options?
75. Table saIt (NaCl) is a pro duct of
76. Read the statement and decide which conclusions are correct.
Statement:
Sulphuric acid is acidic in nature.
Conclusion:
1. The pH value of sulphuric acid is 7.5.
2. Sulphuric acid contains some phosphorus.
Statement:
Sulphuric acid is acidic in nature.
Conclusion:
1. The pH value of sulphuric acid is 7.5.
2. Sulphuric acid contains some phosphorus.
77. Which one of the following was the first mineral acid discovered?
78. Which of the following solutions will not change the colour of blue litmus paper to red?
1. Acid solution
2. Base solution
3. Common salt solution
Select the correct answer:
1. Acid solution
2. Base solution
3. Common salt solution
Select the correct answer:
79. What is untrue for bleaching powder?
80. Which one among the following is not a property of salt?
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