#### Basic Concepts of Chemistry and Chemical Calculations Two Marks Question

11th Standard

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 30
15 x 2 = 30
1. What do you understand by the term mole

2. Define equivalent mass

3. What do you understand by the term oxidation number?

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

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

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

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

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

9. Define relative atomic mass

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

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

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

13. 3 grams of hydrogen reacts with 29g of O, to yield H2O. Calculate the amount of one of the reactants which remains unreacted.

14. What do you understand by the term 'stoichiometry of the reaction?

15. Calculate the equivalent mass of the following:CO3-2,