Solutions: MCQs | Question – Paper 3 1

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Topic: Solutions, Test No.: 03, Total MCQs: 10

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Question 1
6.02 × 1020 molecules of urea are present in 100 mL of its solution. The concentration of solution is [NEET 2013]
A
0.02 M
B
0.01 M
C
0.001 M
D
0.1 M
Question 2
How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO3? The concentrated acid is 70% HNO3. [NEET 2013]
A
45.0 g conc. HNO3
B
90.0 g conc. HNO3
C
70.0 g conc. HNO3
D
54.0 g conc. HNO3
Question 3
A 5.25% solution of a substance is isotonic with a 1.5% solution of urea (molar mass = 60 g mol–1) in the same solvent. If the densities of both the solutions are assumed to be equal to 1.0 g cm–3, molar mass of the substance will be
A
90.0 g mol-1
B
115.0 g mol-1
C
105.0 g mol-1
D
210.0 g mol-1
Question 4
At 80°C the vapour pressure of pure liquid ‘A’ is 520 mm Hg and that of pure liquid ‘B’ is 1000 mm Hg. If a mixture of solution of 'A’ and ‘B’ boils at 80°C and 1 atm pressure, the amount of ‘A’ in the mixture is (1 atm = 760 mm Hg)
A
50 mol percent
B
52 mol percent
C
34 mol percent
D
48 mol percent
Question 5
A 0.0020 m aqueous solution of an ionic compound Co(NH3)5 (NO2)Cl freezes at –0.00732°C. Number of moles of ions which 1 mol of ionic compound produces on being dissolved in water will be (kf = 1.86°C/m)
A
3
B
4
C
1
D
2
Question 6
Solution A contains 7g/L of MgCl2 and solution B contains 7g/L of NaCl. At room temperature, the osmotic pressure of:
A
solution B is greater than A
B
both have same osmotic pressure
C
solution A is greater than B
D
can't determine
Question 7
Which of the following liquid pairs shows a positive deviation from Raoult's law?
A
Water – hydrochloric acid
B
Benzene – methanol
C
Water – nitric acid
D
Acetone – chloroform
Question 8
The elevation in boiling point of a solution of 13.44 g of CuCl2 in 1 kg of water using following information will be (molecular wt. of CuCl2 = 134.4, Kb = 0.52 K molal–1)
A
0.16
B
0.05
C
0.1
D
0.2
Question 9
After removing the hard shell of an egg by dissolving in dil. HCl, a semipermeable membrane is visible. If such an egg is kept in a saturated solution of common salt the size of the egg will
A
shrink
B
grow
C
remain the same
D
first shrink and then grow larger
Question 10
In an oxidation reduction reaction, dichromate (Cr2O7–2) ion is reduced to Cr+3 ion. The equivalent weight of K2Cr2O7 in this reaction is
A
Molecular weight/3
B
Molecular weight/6
C
Molecular weight/1
D
Molecular weight/2
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