Atoms, Molecules, Chemical Arithmatic and Volumetric Analysis Test Online MCQs

1. The quantum number ‘m’ of a free gaseous atom is associated with:

2. The weight of one molecule of a compound of molecular formula C₆₀H₁₂₂ is:

3. The weight of NaC1 decomposed by 4.9g of H₂SO₄, if 6 g of sodium hydrogen sulphate and 1.825 g of HC1, were produced in the reaction is:

4. A gas occupies a volume of 300 cc at 27°C and 620 mm pressure. The volume of gas at 47°C and 640 mm pressure is:

5. The oxide of an element contains 67.67% oxygen and the vapour density of its volatile chloride is 79. Equivalent weight of the element is: 

6. The wavelength of a 150 g rubber ball moving with a velocity of 50 ms⁻¹ is:

7. 10²¹ molecules are removed from 200 mg of CO₂. The moles of CO₂ left are:

8. Calculate the millimoles of SeO₃²⁻ in solution on the basis of following data: 70ml of M/60 solution of KBrO₃ was added to SeO₃²⁻ solution. The bromine evolved was removed by boiling and excess of KBrO₃ was back titrated with 12.5 mL of M/25 solution of NaAsO₂. The reactions are given below

I. SeO₃²⁻ + BrO₃⁻+ H⁺ → SeO²₄⁻+Br₂+ H₂O

II. BrO₃⁻+ AsO₂⁻ + H₂O → Br⁻ + AsO³₄⁻+ H⁺

9. 60 gm of an organic compound on analysis is found to have C = 24g, H = 4g and O = 32g. The empirical formula of compound is:

10. The weight of a single atom of oxygen is:

11. Quantum numbers of an atom can be defined on the basis of

12. 0.4 moles of HCI and 0.2 moles of CAC1₂ were dissolved in water to have 500 mL of solution, the polarity of C1⁻ ion is:

13. Volume of a gas at NTP is 1.12 x 10⁻⁷ cc. The number of molecule in it is:

14. Azimuthal quantum number defines

15. At a constant volume the specific heat of a gas is 0.075 and its molecular weight is 40. The gas is: