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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
A sample of ammonium phosphate, $(NH_4)_3PO_4$ , contains $6\,moles$ of hydrogen atoms. The number moles of oxygen atoms in the sample is
  • A
    $1$
  • ✓
    $2$
  • C
    $4$
  • D
    $6$
✓

Answer

Correct option: B.
$2$
b
No. of $H-$atoms $=12$

No. of $O-$atoms $=4$

$\therefore$ so, ratio of no. of atoms $=$ ratio of no. of moles

$\frac{12}{4}=\frac{6}{n_{o}}$

$n_{o}=2$

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