Discussion
(A) Metal oxides are basic in nature.
(B) Air expands on heating.
(C) Lime water turns milky on passing carbondioxide.
(D) Sodium hydroxide and hydrochloric acid neutralise each other.
If observation is represented by O and inference by I, which of the following statements is correct ?
Answer: C
The correct classification is O - C; I - A, B, D.
An observation is something seen directly with the senses: when carbon dioxide is passed through lime water, you can see it turn milky (C).
The other three are inferences, conclusions drawn by reasoning from observations. That metal oxides are basic is inferred from tests such as their turning red litmus blue; that air expands on heating is inferred from effects such as a balloon on a heated flask inflating; and that sodium hydroxide and hydrochloric acid neutralise each other is inferred from indicator or temperature changes. Options putting B, D or A among the observations are therefore wrong.
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