Chemistry Past Questions and Answers

In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?

Na<sub style='font-size: smaller;'>2</sub>CO<sub style='font-size: smaller;'>3</sub> + 2HCI → 2NaCI + H<sub style='font-size: smaller;'>2</sub>O + CO<sub style='font-size: smaller;'>2</sub>. Using the above equation, what volume of carbondioxide, measured at s.t.p is liberated when 53g of sodium carbonate is dissolved in hydrochloric acid?<br/>(1 mole of gas occupies 22.4 dm<sup style='font-size: smaller;'>3</sup> at s.t.p)<br/>(Na = 23, C = 12, O = 16)

When sodium nitrate dissolves in water, ∆H is positive. This means that?

If an organic compound decolorizes bromine water then the compound is?

When air is compressed?