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Chemistry - Acids and Bases and Salts

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86. The following colours produced by the universal indicator paper at pH values are arranged in its ascending order. The correct option is a. Green b. Dark red c. Dark purple d. Greenish blue e. Orange red (NTSE Karnataka, Stage-I, 2016-17)

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87. Assertion (A) : The flowers of Hydrangea plant turns to pink in the presence of potassium hydroxide.

Reason (R) : The flowers of Hydrangea plant are usually pink which turn blue in the presence of a base (NTSE Karnataka, Stage-I, 2016-17)

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88. On passing CO2 gas in excess in aqueous  solution of sodium carbonate, the substance  obtained is (NTSE Madhya Pradesh, Stage-I, 2015-16) (NTSE Madhya Pradesh, Stage-I, 2012-13)

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89. The solution of a colourless salt in water has pH value of =9. The salt would be (NTSE Odisha, Stage-I, 2015-16)

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90. Aquaregia can dissolve gold because (NTSE Odisha, Stage-I, 2016-17)

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Acids and Bases and Salts