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91. Match the following (i) Ant's sting (A) Oxalic acid (ii) Tomato (B) Lactic acid (iii) Tamarind (C) Methanoic acid x (iv) Sour Milk (Curd) (D) Tartaric acid (NTSE Punjab, Stage-I, 2015-16)
(i)-(C), (ii)-(A), (iii)-(B), (iv)-(D)
(i)-(C), (ii)-(A), (iii)-(D), (iv)-(B)
(i)-(A), (ii)-(C), (iii)-(D), (iv)-(B)
(i)-(A), (ii)-(C), (iii)-(B), (iv)-(D)
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92. pH of a solution is zero. The nature of this solution is (NTSE Rajasthan, Stage-I, 2014-15)
Acidic
Basic
Neutral
Amphoteric
93. The difference in number of crystalline water molecules in a molecule of gypsum and a molecule of plaster of Paris is
5/2
2
1/2
3/2
94. pH paper is separately dipped into 2 different solutions X and Y. Colour of pH paper turned pale green in X and blue in Y. X and Yare most probably (NTSE Tamil Nadu, Stage-I, 2016-17)
X-water, Y-NaOH
X-NaOH, Y-H2O
X-HCI, Y-NaOH
X-NaOH, Y-HCI
95. A set of students went on a nature trip where one of the students disturbed the honey comb, by throwing a stone on it. Few students were stung by the bee. A person gathering medicinal plants, came to their rescue and applied the extract of some leaves, which relieved the students of their pain. The chemical nature of leaf (NTSE Tamil Nadu, Stage-I, 2016-17)would have been
Mildly acidic
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