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Some Basic Concepts of Chemistry question

2018 · Q115
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Some Basic Concepts of Chemistry question

2018 · Q115

NEETChemistrySome Basic Concepts of ChemistryMCQ+4 / −1
A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4 . The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be
  1. A
    1.4
  2. B
    3.0
  3. C
    2.8
  4. D
    4.4
View written solutionFree

Correct answer: C

HCOOH$$\xrightarrow{{H_2}S{O_4}} $$H2O+CO
Initial$${{2.3} \over {46}} = {1 \over {20}}$$00
Final0${1 \over {20}}$${1 \over {20}}$
.tg {border-collapse:collapse;border-color:#ccc;border-spacing:0;} .tg td{background-color:#fff;border-color:#ccc;border-style:solid;border-width:0px;color:#333; font-family:Arial, sans-serif;font-size:14px;overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{background-color:#f0f0f0;border-color:#ccc;border-style:solid;border-width:0px;color:#333; font-family:Arial, sans-serif;font-size:14px;font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-bzci{font-size:20px;text-align:center;vertical-align:top} .tg .tg-60hs{font-size:20px;text-align:left;vertical-align:top}
H2C2O4$$\xrightarrow{{H_2}S{O_4}} $$H2O+CO+CO2
Initial$${{4.5} \over {90}} = {1 \over {20}}$$000
Final0${1 \over {20}}$${1 \over {20}}$${1 \over {20}}$


KOH will absorb CO2 and conc. H2SO4 will absorb obtain water so in final solution only CO left.

Moles of CO formed from both reactions,
= ${1 \over {20}}$ + ${1 \over {20}}$ = ${1 \over {10}}$

$ \therefore $ Mass of CO = moles × molar mass = $${1 \over {10}} \times 28$$ = 2.8 g
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