1. Isotopes differs in
A. arrangement of electrons in orbitals
B. position in the periodic table
C. properties depend upon mass
D. chemical properties
✅ The correct answer is option D.
Chemistry Diagnostic Test MCQs
2. The mass of one mole of an electron is
A. 1.008
B. 0.55
C. 0.184
D. 1.637
✅ The correct answer is option B.
3. The volume occupied by 1.4g CO at S.T.P is
A. 22.4 dm3
B. 2.24 dm3
C. 1.12 cm3
D. 1.12 dm3
✅ The correct answer is option D.
4. The number of atoms in a molecule determines
A. macromolecule
B. macromolecule
C. molecularity
D. atomicity
✅ The correct answer is option D.
5. Which of the following set has all species isoelectronic
A. F – Cl – Br
B. Li+1 – Na+1 – K+1
C. F – Ne – Na+
D. H+ – H- – H
✅ The correct answer is option C.
6. Which element has same isotopes like palladium
A. Nickel
B. Calcium
C. Cadmium
D. Tin
✅ The correct answer is option B.
7. Water absorber used in combustion analysis is
A. 50% KOH
B. Lime water
C. CaCl2
D. Mg (CIO4)2
✅ The correct answer is option D.
8. A limiting reactant is one which
A. is taken in lesser quantity in grams as compared to other reactants
B. is taken in lesser quantity in volume as compared to other reactants
C. gives the maximum amount of the product which is required
D. gives the minimum amount of the product under consideration
✅ The correct answer is option D.
9. The type of filtering media used for filtration depending upon
A. Nature of reactants
B. Nature of crucible
C. Nature of product
D. Nature of precipitate
✅ The correct answer is option D.
10. A safe and more reliable method for drying the crystal is
A. Hot air currents
B. folds of filter paper
C. oven
D. Vacuum desiccator
✅ The correct answer is option D.