question_subject:
Science
question_exam:
CDS-II
stats:
0,15,17,15,2,13,2
keywords:
{'hydrogen gas': [0, 0, 1, 2], 'reactants': [0, 0, 0, 3], 'reaction': [1, 0, 5, 18], 'nitric acid': [0, 0, 0, 2], 'hydrochloric acid': [1, 0, 3, 0], 'magnesium': [1, 0, 2, 3], 'calcium carbonate': [0, 0, 1, 4], 'zinc': [1, 0, 0, 2], 'copper': [1, 0, 1, 1], 'dilute': [0, 0, 0, 4]}