If you are in 1st year class
And searching for important short questions for your exams preparation than read it out
Here is some short questions from chapter 1 of 1st year
Atom , MOLECULE & ION
1. What is meaning of atom? (What is Greek concept of atom)
2. What is Dalton 's theory about atorn? Give modem definition of atom
3 .Write about subatomic particles
4. What is Berzelius contribution about atom?
5. What is molecule. Give examples
6. What are macromolecules?
7. How cations are formed?
8. How anions are formed?
9. What are molecular ions? Give examples. How it is generated?
10. What is meant by relative atomic mass and atomic mass unit?
11. Define isotopes. How isotopes differ from one another?
12. Why isotopes have same chemical properties but different physical properties?
13. What are monoisotopic elements. Give examples
14. Why atomic masses of elements are usually in fractions?
Mass SPECTROMETRY
15. What is mass spectrometer? Write principal of mass spectrometry
16. What is the function of ionization chamber and magnetic field in mass spectrometer?
17. Define mass spectrum and electrometer
18. Give the names of methods used to separate isotopes.
EMPERICAL AND MOLECULAR FORMULA
19. Differentiate b/w empirical & molecular fonnula. What is relation b/w them?
20. Why some compounds have same empirical and molecular fonnula? Also give examples
21. Write main steps to find empirical / molecular formula
22. What is combustion analysis (Write procedure of combustion analysis)
MOLE, MOLAR VOLUME & AVOGADRO 'S NUMBER
23. What is relation b/w mole and Avogadro's number (Define Avogadro's number
24. What is relation b/w mole and mass?
25. One mole of water has two moles of bonds and three moles of atoms Explain
26. NaCl has 58.5 amu formula mass and not the molecular mass. (Ionic compounds are represented by formula mass but not with molecular mass Give reason)
27. Prove that one mole of carbondioxide , Nitrogen and Hydrogen contain equal number of molecules
28. Explain molar volume with example
29. Why one mole of different gases occupies the same volume?
STOICHIOMETRY AND LIMITING REACTANTS
30. Define stoichiometry. What relations are studied in it?
31. What are limitations of chemical equations? Write assumptions of stoichiometry
32. What is law of conservation of mass and law of definite proportion?
33. What are limiting reactants. Give example
34. Why in experimental work one reactant is taken in excess quantity?
35. Amount of products formed in a chemical reaction depend on the limiting reactant. Comment
36. Write steps to identify limiting reactant
YIELD
37. Differentiate actual and theoretical yield?
38. How efficiency of a reaction is measured (What is %age yield)?
39. Why actual yield is less than theoretical yield?
NUMERICALS
40. Convert 0.5 moles of water in grams.
41. Calculate mass in grams of 10 moles of water.
42. Calculate number of molecules present in 4.4 g of CO2
43. 23 g of Na and 39 g of K have equal number of atoins. Justify
44. What is no. of H+ ions in 9.8 g of H3P04.?
45. How many molecules of water are in 24 g of ice?
46. Calculate mass in Kg of 2.6 x 10^23 molecules of SO2?
47. Calculate mass in grams of 2.74 moles of KMnO4
48. Calculate mass of 3.01 x 10^23 molecules of CO2.
49.11 g of carbon is reacted with 32 g of oxygen to give CO2. Which one is limiting reactant?
50. Find no. of oxygen atoms in 0.4 moles of ozone.
Regards : Talha.
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