IIT FOUNDATION :: KARIMNAGAR

Class : X Time :45 min.
Sub : Chemistry Marks :25

I. Choose the correct Answer : 10 x 1 = 10
1. 10 grams of Na2 CO3 is dissolved in 190 grams of water. The w% of solution is
A) 20 B) 10 C) 5 D) 2.5 [ ]
2. The amount of oxalic acid (mol. wt= 126) required to prepare 100 ml of 0.2 M solution is A) 1.26 g B) 2.52 g C) 5.04 g D) 0.63 g [ ]
3. Four grams of NaOH (mol. wt = 40) is dissolved in 34.2 grams of water (mol. wt=18)
A) 0.1 B) 0.2 C) 0.05 D) 0.025 [ ]
4. 4 ml of alcohol is dissolved in 36 ml of water. The volume percentage of solution is A) 10 B) 20 C) 30 D) 40 [ ]
5. In which of the following compounds solubility decreases with increase in temperature A) NaNO3 B) NaCl C) Ce2(SO4)3 D) None of these [ ]
6. In which of the following compounds solubility decreases solubility decreases with increase in temperature [ ]
A) NaNO3 B) NaCl C) Ce2(SO4)3 D) None of these
7. Which of the following is a non – electrolyte [ ]
A) Acetic acid B) Sodium chloride C) Glucose D) Sodium hydroxide
8. The molarity of 4% NaOH solution is [ ]
A) 0.1 B) 0.5 C) 0.001 D) 1.0
9. No of moles of A is 2 and no. of moles of B is 3. The mole fraction of B containing A and B only is [ ]
A) 0.6 B) 0.4 C) 3 D) 1.3
10. An example of a polar solvent [ ]
A) Alcohol B) Benzene C) Water D) Kerosene
II. Fill in the blanks: 5 x 1 = 5
11. Solute + _____________________________ = Solution.
12. Standard solution is prepared in _________________________
13. If moles of Na2CO3 are dissolved in 3 moles of water, the mole fraction of water is _______________________________
14. The molarity of a solution containing 5.3 gms of anhydrous sodium carbonate per litre is __________________________________
15. On increasing the temperature, the solubility of NaNO3 ______________________
III. Answer the following : 5 x 2 = 10
16. Naphthalene is soluble in kerosene, but not in water. why ?
17. How do you increase the extent of ionization of a weak electrolyte ?
18. A solution is 4% NaOH by weight, if we require 10 grams of NaOH, how much of this solution by weight do we need ?
19. Calculate the number of moles of oxalic acid present in 400 ml of its 0.025 M solution.
20. 2 moles of Na2CO3 is added to 3 moles of water. Calculate the mole fraction of Na2CO3 and water ?