Mole Concept _Test Paper

8/11/2019 Mole Concept _Test Paper

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MUMBAI / NASHIK/ AKOLA / DELHI / KOLKATA / LUCKNOW TIME: 1 HR TOPIC: MOLE CONCEPT MARKS: 69

Single Choice Questions (+3, –1)

1. Percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (At. Wt. = 78.4).The minimum molecular weight of peroxidase anhydrous enzyme is:(a) 41.568 10 (b) 31.568 10 (c) 15.68 (d) 43.136 10

2. The mass of 3CaCO produced when carbon dioxide is bubbled through 500 mL of 0.5 M 2Ca OH

solution, will be:(a) 25 g (b) 50 g (c) 20 g (d) 10 g

3. 2.5 litres of 1 M NaOH is mixed with 3.0 litres of 0.5 M NaOH solution. The molarity of resultingsolution is:(a) 0.80 M (b) 1.0 M (c) 0.73 M (d) 0.50 M

4. An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C 38.71%,H 9.67% and O 51.62%. The empirical formula of the compound would be:(a) CHO (b) 4CH O (c) 3CH O (d) 2CH O

5. The number of atoms in 0.1 mole of a triatomic gas is:(a) 226.026 10 (b) 231.806 10 (c) 233.6 10 (d) 221.8 10

6. Two oxides of a metal contain 27.6% and 30% of oxygen respectively. If the formula of the 1 st oxideis 3 4M O , the formula of the 2 nd oxide is

(a) MO (b) 2 3M O (c) 2MO (d) 3 2M O

7. 5 mol of A and 12 mol of B are taken for a reaction shown by the equation, 'A 3B 2C' . Howmany moles of C will be produced?(a) 5 (b) 12 (c) 24 (d) none of these

8. In Uyeno’s method 54 g of Al produces 67200 3cm of hydrogen gas at STP. What weight of Al will produce1 mole 2H gas?

(a) 9 (b) 18 (c) 27 (d) none of these

9. Average mass of 10 B and 11 B is 10.81. What is the percentage of 11 B in mixture of isotopes?(a) 10% (b) 11% (c) 19% (d) 81%

10. The approximate molecular mass of haemoglobin is 67200g 1mol and contains 0.33% iron byweight (At. Wt. = 56). The number of Fe – atoms per molecule of haemoglobin is:(a) 1 (b) 2 (c) 4 (d) 6

11. From 490 mg of 2 4H SO , 2010 molecules are removed. The number of molecules left over are:

(a) 216.02 10 (b) 214.9 10 (c) 213.01 10 (d) 212.91 10



12. 20 mL of 0.1 M, 30 mL of 0.2 M and 30 mL of 0.3 solutions of oxalic acid are mixed and thevolume is made 100 mL. The molarity of the resulting solution is:(a) 0.21 M (b) 8.51 M (c) 5.67 M (d) 0.17 M

13. A 0.5 MNaOH solution has density 1.02 g 1mL . Its molarity is:(a) 0.51 m (b) 0.49 m (c) 0.50 m (d) Cannot be calculated

14. 15 g of urea (molecular mass = 60 g) is dissolved in 175.5 g of water. The mole fraction of urea insolution is:(a)0.005 (b) 0.05 (c) 0.50 (d) None of these

15. 50 mL of 0.2 NaOH is mixed with 25 mL of 0.2 M 2 4H SO . The resulting solution is:

(a) acidic, 0.2 M (b) basic, 0.2 M(c) basic, 0.4 M (d) neutral

16. 0.63 g of dibasic acid is available in 100 mL solution. 20 mL of this solution required 20 mL ofM

NaOH10

solution for complete neutralization. The molar mass of the acid is:

(a) 63 g (b) 126 g (c) 31.5 g (d) 94.5 g

17. 10 mL of 0.1 M 2 4H SO is needed for complete reaction with 25 mL of 11.44 g 1L 2 3 2 Na CO .xH O .

The value of x is:(a) zero (b) 3 (c) 6 (d) 10

18. Mole fraction of urea in 11.11 molal aqueous solution is:(a) 0.1 (b) 0.17 (c) 0.2 (d) 0.37

19. If volume of a mixture of 2CO and CO increases by 20% on passing over hot coke, the percentage of

2CO in the original mixture is: 2C CO 2CO

(a) 10% (b) 15% (c) 20% (d) 25%

20. 2O gas produced by the reaction of 2.45 g of 3KClO is completely reacted with 2H gas obtained by

the reaction of zinc and dil. 2 4H SO . What weight of zinc is required for the production of this 2H

gas? (molar mass of 3KClO = 122.5 g, Zn = 65 g)

(a) 1.3 g (b) 2.6 g (c) 3.9 g (d) 5.2 g

21. Density of a 2.05 M solution of acetic acid (molecular mass 60) in water is 1.02 g/mL. The molality

of the solution is:(a) 13.28molkg (b) 12.28molkg (c) 10.44molkg (d) 11.14molkg

22. The density of a 3.60 M sulphuric acid solution that is 29% 2 4H SO (molar mass = 98 g 1mol ) by

mass in g 1mL will be:(a) 1.45 (b) 1.65 (c) 1.88 (d) 1.22

23. The molality of a urea solution in which 0.100 g of urea 2 2 NH CO is added to 30.3000dm of

water is STP is:(a) 23.33 10 m (b) 0.555 m (c) 45.55 10 m (d) 33.3 m



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Mole Concept _Test Paper