#### Creative two mark questions Basic Concepts of Chemistry and Chemical Calculations

11th Standard

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Chemistry

Answer each of the following questions
Time : 01:00:00 Hrs
Total Marks : 70

Part - A

35 x 2 = 70
1. Calculate the molar mass of the following compounds. - acetone [CH3 COCH3]

2. Calculate the molar mass of the following compounds. -boric Acid [H3BO3]

3. Calculate the molar mass of the following compounds. -Sulphurci  Acid [H2SO4]

4. Balance the following equations by ion electron method - ${ C }_{ 2 }{ O }_{ 4 }^{ 2- }+{ Cr }_{ 2 }{ O }_{ 7 }^{ 2- }\longrightarrow { Cr }^{ 3+ }+{ CO }_{ 2 }$ (in acid medium)

5. Balance the following equations by ion electron method ${ Na }_{ 2 }{ S }_{ 2 }{ O }_{ 3 }+{ I }_{ 2 }\longrightarrow { Na }_{ 2 }{ S }_{ 4 }{ O }_{ 6 }+NaI$

6. Balance the following equations by ion electron method $Zn+{ NO }_{ 3 }^{ - }\longrightarrow { Zn }^{ 2+ }+No$

7. Balance the following equations by oxidation number method - ${ K }Mno_{ 4 }+{ Na }_{ 2 }{ So }_{ 3 }\longrightarrow { MnO }_{ 2 }+{ Na }_{ 2 }{ So }_{ 4 }+KOH$

8. Balance the following equations by oxidation number method - $Cu+{ HNO }_{ 3 }\longrightarrow Cu\left( { No }_{ 3 } \right) _{ 2 }+{ No }_{ 2 }+{ H }_{ 2 }O$

9. Balance the following equations by oxidation number method - ${ KMn }O_{ 4 }+{ H }_{ 2 }{ C }_{ 2 }{ O }_{ 4 }+{ H }_{ 2 }{ SO }_{ 4 }\longrightarrow { K }_{ 2 }{ SO }_{ 4 }+{ MnSO }_{ 4 }+{ CO }_{ 2 }+{ H }_{ 2 }O$

10. Give a brief account of classification of matter.

11. Distinguish between a homogeneous and heterogeneous mixture.

12. Mention the characteristics of a compound.

13. Why atomic masses are called as relative atomic masses?

14. Which atom is considered to be a standard atom by 1UPAC to measure atomic masses and what is its atomic mass?

15. Define relative atomic mass

16. The atomic mass of oxygen is 16. What is the actual mass of an oxygen atom?

17. Give examples for the following redox reaction "Combination".

18. Give examples for the following redox reaction "Decomposition".

19. Give examples for the following redox reaction "Metal displacement reaction".

20. Give examples for the following redox reaction "Disproportionation."

21. Give the relationship between the number of mole of the substance and its gram molecular mass.

22. Calculate the equivalent masses of the following - HCl

23. Calculate the equivalent masses of the following - HNO3

24. Calculate the equivalent masses of the following - Oxalic acid H2C2O4

25. Calculate the equivalent masses of the following - Crystalline Oxalic acid, H2C2O4 , 2H2O

26. Calculate the equivalent masses of the following - Ferrous Sulphate

27. Calculate the oxidation number of underlined atoms of the following:
NO3-

28. Calculate the oxidation number of underlined atoms of the following:
H4P2O7.

29. Calculate the oxidation number of underlined atoms of the following:
ClO3-

30. Calculate the oxidation number of underlined atoms of the following:
ASO3-2

31. Calculate the oxidation number of underlined atoms of the following:
S2O3-2

32. Calculate the oxidation number of underlined atoms of the following:
C6H12O6

33. Calculate the oxidation number of underlined atoms of the following:
Na2[Fe(CN)6]

34. Give examples of redox reactions in daily life.

35. The relative molecular mass of sulphuric acid (H2SO4) is 98 a.m.u. What is its molar mass?