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71. The pH-value of bite of honey-bee is (NTSE Gujarat, Stage-I, 2016-17)
7
More than 7
Less than 7
Of any value
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72. The discomfort caused by indigestion due to over eating can be cured by taking (NTSE Chandigarh, Stage-I, 2016-17)
Vinegar
Lemon juice
Baking soda
Caustic soda
73. Which of the following is treated with chlorine to obtain bleaching powder? (NTSE Chandigarh, Stage-I, 2016-17)
CaS04
Ca(OH)2
Mg(OH)2
KOH
74. A solution of calcium hydroxide is used for white washing walls. After two to three days of white washing, walls start shining due to formation of compound
CaO
CaC03
Ca(HC03)2
75. Which one of the following oxides gives pink colour with phenolphthalein indicator in aqueous solution?
N2O
NO
CO2
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