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1. Some basic concept of chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry1. Some basic concept of chemistry1 Mark
MCQ
Assertion :One molal aqueous solution of glucose contains $180\,g$ of glucose in $1\, kg$ water.
Reason : Solution containing one mole of solute in $1000\, g$ of solvent is called one molal solution.
  • ✓
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: A.
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
a
$Molality = \frac{{No.\,of\,moles\,of\,solute}}{{Wt\,of\,solvent\,in\,kg.}}$

$Here,No.\,of\,moles = \frac{{Molecular\,mass}}{{Wt\,of\,solvent}}\,$

                                                    $ = \frac{{180}}{{180}} = 1$

$\therefore \,Molality = \frac{1}{1} = 1$

Hence assertion and reason, both are correct, and reason is the correct explanation of assertion

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