The empirical formula of organic compound is CH2O and molecular mass is 60g/mol. What is the molecular formula?
A. C6H12O6
B. CH3-CH3
D. C2H6O

Answer: C

Conceptual Answer

56g of Fe reacts with 24g of oxygen to produce Fe2O3. Which one is limiting reactant
A. Fe
B. 02
C. Fe2O3
D. Both are consumed completely

Answer: D

Conceptual Answer

The largest number of molecules are present in
A. 3.6g of H2O
B. 4.8g of C2H5OH
C. 2.8g of CO
D. 5.4g N2O5

Answer: A

Conceptual Answer

The mass of one carbon atom is
A. 12amu
B. 12/NA
C. 2×10-23g
D. All of these

Answer: D

Conceptual Answer

Number of electrons in 1.6g of methane
A. NA / 2
C. 12NA
D. NA/5

Answer: B

Conceptual Answer

This Post Has 6 Comments

  1. Khadija ali

    Amazing sir g…i need these mcqs in pdf plzz …. please share me in email these all mcqs of chemistry from fsc to BS PLZZZ SIR plzz

    1. Umair Ali khan

      These MCQs are not available in pdf. Material is taken from different sources, students requested or from past papers and put on the website randomly without writing in pdf.

  2. M bialal

    sir where are the lectures mcqs of other chapters of pmc chemistry explanation ?

  3. Priyanka

    Sir I am unable to find notes I want notes for macromolecules

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