(a). If both (A) and (R) are correct and (R) is the appropriate explanation for (A). (b). If both (A) and (R) are correct and (R) is the correct explanation of (A). (c). If (A) is correct but (R) is incorrect. (d). If (A) is incorrect, but (R) is correct. (e). If both (A) and (R) are incorrect. Q. Assertion (A): in the titration of `Na_(2)CO_(3)` with HCl using methyl orange indicator, the volume required at the equivalence point is twice that of the acid requried using phenolphthalein indicator. Reason (R): Two moles of HCl is requried for the complete neutralisation of 1 " mol of "`Na_(2)O_(3)`

(a). If both (A) and (R) are correct and (R) is the appropriate explan

1.	(a). If both (A) and (R) are correct and (R) is the appropriate explanation for (A). (b). If both (A) and (R) are correct and (R) is the correct explanation of (A). (c). If (A) is correct but (R) is incorrect. (d). If (A) is incorrect, but (R) is correct. (e). If both (A) and (R) are incorrect. Q. Assertion (A): in the titration of `Na_(2)CO_(3)` with HCl using methyl orange indicator, the volume required at the equivalence point is twice that of the acid requried using phenolphthalein indicator. Reason (R): Two moles of HCl is requried for the complete neutralisation of 1 " mol of "`Na_(2)O_(3)`
Answer» Correct Answer - B `Na_(2)CO_(3)+"HCl"toNaHCO_(3)+NaCl` At this point phenolphthalein changes colour but when methyl orange is used as an indicator it changes colour when complete reaction takes place. `Na_(2)CO_(3)+2"HCl"to2NaCl+CO_(2)+H_(2)O`

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The purity of `H_2O_2` in a given sample is `85%.` Calculate the weight of impure sample of `H_2O_2` which requires `10mL` of `M//5 KMnO_4` solution in a titration in acidic mediumA. 2 gB. 0.2 gC. 0.17 gD. 0.15 g
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`12. g` of an impure sample of arsenious oxide was dissolved in water containing `7.5 g` of sodium bicarbonate and the resulting solution was diluted to `250 mL`. `25 mL` of this solution was completely oxidised by `22.4 mL` of a solution of iodine. `25 mL` of this iodine solution reacted with same volume of a solution containing `24.8 g` of sodium thiosulphate `(Na_(2)S_(2)O_(3).5H_(2)O)` in one litre. Calculate teh percentage of arsenious oxide in the sample ( Atomic mass of `As=74`)
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How many moles of `O_(2)` will be liberated by one mole of `CrO_(5)` is the following reaction: `CrO_(5) + H_(2) SO_(4) rarr Cr_(2) (SO_(4))_(3) + H_(2)O + O_(2)`A. `(5)/(2)`B. `(5)/(4)`C. `(9)/(2)`D. none of these
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