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A solution contains \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) and \( \mathrm{NaHCO}_{3} .10 \mathrm{~mL} \) of the solution required \( 2.5 \mathrm{~mL} \) of \( 0.1 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{4} \) for neutralisation using phenolphthalein as indicator. Methyl orange is then added when a further \( 2.5 \mathrm{~mL} \) of \( 0.2 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{4} \) was required. The amount of \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) and \( \mathrm{NaHCO}_{3} \) in 1 litre of the solution is:
(a) \( 5.3 \mathrm{~g} \) and \( 4.2 \mathrm{~g} \)
(b) \( 3.3 \mathrm{~g} \) and \( 6.2 \mathrm{~g} \)
(c) \( 4.2 \mathrm{~g} \) and \( 5.3 \mathrm{~g} \)
(d) \( 6.2 \mathrm{~g} \) and \( 3.3 \mathrm{~g} \)
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