Q: 91 (NDA-II/2016)
question_subject:
Science
question_exam:
NDA-II
stats:
0,31,41,18,37,12,5
keywords:
{'acidic solution': [0, 0, 0, 1], 'gases': [0, 0, 5, 12], 'hydrogen': [0, 0, 1, 3], 'carbondioxide': [0, 0, 0, 1], 'oxygen': [3, 0, 1, 0], 'nitrogen': [1, 1, 0, 2], 'water': [65, 15, 80, 129]}
Out of the options given, option 2 - Carbondioxide gives an acidic solution on dissolving in water. When carbon dioxide (CO2) is dissolved in water, it forms carbonic acid (H2CO3). The presence of carbonic acid in water makes it slightly acidic.
Option 1 - Hydrogen is not a gas that gives an acidic solution when dissolved in water. Hydrogen gas does not react with water to form an acidic solution.
Option 3 - Nitrogen is a non-reactive gas and does not form any acids when dissolved in water. It remains inert when mixed with water.
Option 4 - Oxygen is also not a gas that gives an acidic solution when dissolved in water. Oxygen gas does not react with water to form an acidic solution.
Hence, the correct answer is option 2 - Carbondioxide.