Q. No.How many moles of magnesium phosphate, Mg₃(PO₄)₂, contain 0.25 moles of oxygen atoms?
1.
0.02
2.
3.125 × 10–2
3.
1.25 × 10–2
4.
2.5 × 10–2
\(6.02\times10^{20}\) molecules of urea are present in 100 mL of its solution. The concentration of urea solution is:
(Avogadro constant, \(N_A=6.02\times10^{23}~mol^{-1}\))
1. 0.001 M
2. 0.01 M
3. 0.02 M
4. 0.1 M
To neutralize 20 mL of 0.1 M aqueous solution of phosphorus acid \((H_3PO_3) \) completely, the volume of 0.1 M aqueous KOH solution required is:
| 1. | 10 mL | 2. | 20 mL |
| 3. | 40 mL | 4. | 60 mL |
Two solutions of a substance (non electrolyte) are mixed in the following manner.
480 mL of 1.5 M first solution +520 mL of 1.2 M second solution.
What is the molarity of the final mixture?
1. 2.70 M
2. 1.344 M
3. 1.50 M
4. 1.20 M
Which of the following concentration factor is affected by a change in temperature?
1. Molarity
2. Molality
3. Mole fraction
4. Weight fraction
The number of atoms in 560 g of Fe (atomic mass 56 g mol–1) is:
| 1. | Twice that of 70 g N |
| 2. | Half that of 20 g H |
| 3. | Both 1 and 2 |
| 4. | None of the above |
Which of the following statements is true regarding the reaction given below?
\(2 \mathrm{Al}_{(\mathrm{s})}+6 \mathrm{HCl}_{(\mathrm{aq})} \rightarrow 2 \mathrm{Al}^{3+}{ }_{(\mathrm{aq})}+6 \mathrm{Cl}^{-}(\mathrm{aq})+3 \mathrm{H}_2(\mathrm{~g})\)
| 1. | 6L HCl(aq) is consumed for every 3L of H2(g) produced |
| 2. | 33.6 L H2(g) is produced regardless of temperature and pressure for every mole of Al that reacts |
| 3. | 67.2 L H2(g) at STP is produced for every mole of Al that reacts |
| 4. | 11.2 L H2(g) at STP is produced for every mole of HCl(aq) consumed |
The mass of potassium dichromate crystals required to oxidize 750 cm3 of 0.6 M Mohr's salt solution is:
(Given molar mass: potassium dichromate = 294, Mohr's salt = 392)
1. 0.45 g
2. 22.05 g
3. 2.2 g
4. 0.49 g
3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06N) in a flask. After an hour it was filtered and the strength of the filtrate was found to be 0.042 N. The amount of acetic acid adsorbed (per gram of charcoal) is :
1. 18 mg
2. 36 mg
3. 42 mg
4. 54 mg
The molecular formula of a commercial resin used for exchanging ions in water softening is . The maximum uptake of ions by the resin when expressed in mole per gram resin is:
\( \mathrm{C}_8 \mathrm{H}_7 \mathrm{SO}_3 \mathrm{Na}+\mathrm{Ca}^{2+} \rightarrow (\mathrm{C}_8 \mathrm{H}_7 \mathrm{SO}_{3}){_2} \mathrm{Ca}+ \mathrm{Na}^{+}\)
1.
2.
3.
4.
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