A solution contains Na2CO3 and NaHCO3. 10 mL of the solution required 2.5 mL of 0.1 M H2SO4 for neutralisation using phenolphthalein as indicator. Methyl orange is then added when a further 2.5 mL of 0.2 M H2SO4 was required. The amount of Na2CO3 and NaHCO3 in 1 litre of the solution is:

(a) 5.3g and 4.2g

(b) 3.3g and 6.2g

(c) 4.2g and 5.3g

(d) 6.2g and 3.3g

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#9 | n Factor or Valence Factor
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Equivalent Concept
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