Page 49 - Chemistry - XI

Q3. What is the strength of aqueous solution of Pb(NO ) containing 0.5 mol of Pb(NO ) dissolved
3 2
3 2
in 2.5 L of solution? [Molar mass of Pb(NO ) = 233 g mol ]
–1
3 2
(a) 66.2 gL (b) 50 gL (c) 165.5 gL (d) 233 gL –1
–1
–1
–1
Q4. What is the volume of 1 M H SO required to react completely with 25 mL of 1 M NaOH
2
4
solution?
(a) 10 mL (b) 12.5 mL (c) 25.0 mL (d) 100 mL
Q5. Na CO forms colourless crystals in hydrated form. Heating a sample of 100 g of hydrated
2
3
sodium carbonate leads to fi nal residue of 37 g. How many moles of H O of crystallisation are
2
present?
(a) 1 (b) 2 (c) 5 (d) 10

Q6. Standard solution of which of the following cannot be prepared?
(a) Na CO (b) Oxalic acid (c) NaOH (d) All of these
2 3
Q7. Which of the following are used as a primary standard?
(a) Sodium tetra borate (b) Oxalic acid
(c) Ferrous ammonium sulphate (d) All of these

Q8. Which of the following are requirements for a substance to be used as a primary standard?
(a) Available in pure and dry form (b) Should not undergo charge in air

(c) Readily soluble in water (d) All of these
Q9. The equivalent weight of H PO is
3
4
(a) 98/1 (b) 98/2 (c) 98/3 (d) 98/4
Q10. 1 L of 1M solution of HCl was required to be prepared. Standardisation of a test solution
determined its concentration to be 1.05 mol L . What is the volume of water to be added
–1
to make conc. 1 mol L ?
–1
(a) 10 mL (b) 25 mL (c) 50 mL (d) 100 mL

Q11. 25 mL of aq. Na CO reacted with 15 mL of 0.1 M HCl. The molarity of Na CO is
2
3
3
2
(a) 0.03 M (b) 0.06 M (c) 0.12 M (d) 0.24 M
Q12. 25.0 mL of HCl required 30 mL of 0.25 M NaOH for complete neutralisation. The molarity of
HCl is
(a) 0.015 (b) 0.30 (c) 0.030 (d) 0.060

Q13. What volume of 0.1 M H SO is required to completely react with 25 mL of 1 M Ca(OH) ?
2
4
2
(a) 25 mL (b) 2.5 mL (c) 10 mL (d) 20 mL
Answer key

1. (b), 2. (c), 3. (a), 4. (b), 5. (d), 6. (c), 7. (d), 8. (d), 9. (c), 10. (c), 11. (c), 12. (b), 13. (a)

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