71. A fertile soil is likely to have a pH of
72. Litmus is obtained from
73. The pH of lemon juice is expected to be
74. Antacids are found in drugs that give relief to
75. The pH of human blood is between
76. Sour taste of lemon is due to the presence of which of the following ?
77. pH scale ranges from
78. Normal rainwater has a pH level of
79. Which one of the following is used as preservative for foodstuff ?
80. The acid which fails to liberate carbon dioxide from sodium bicarbonate is :
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