Q1. Chemical symbol of sodium is Na. What is its Latin name?

 

Q2. Name the scientist who gave atomic theory of matter.

 

Q3. What are the building blocks of matter?

 

Q4. Write the full form of IUPAC.

 

Q5. Name the scientist who gave law of conservation of mass.

 

Q6. Name the scientist who gave law of constant proportions.

 

Q7. What does the symbol ‘u’ represent?

 

Q8. A change in the physical state can be brought about

(a) only when energy is given to the system

(b) only when energy is taken out from the system

(c) when energy is either given to, or taken out from the system

(d) without any energy change

Ans. (c) when energy is either given to, or taken out from the system

 

Q9. Why are Dalton's symbols not used in chemistry?

Or

What were the problems with Dalton's element symbols?

 

Q10. What is atomicity?

 

Q11. The chemical symbol for nitrogen gas is

(a) Ni (b) N2 (c) N+ (d) N

 

Q12. The chemical symbol for sodium is

(a) So (b) Sd (c) NA (d) Na

 

Q13. What is an atom?

 

Q14. State the ‘law of conservation of mass.’

 

Q15. Who gave the name Parmanu to the smallest particle of matter?

 

Q16. What is the difference between 2H and H2?

 

Q17. Write any 2 laws of chemical combination.

 

Q18. What was the basis for the Dalton's atomic theory?

Or

What formed the basis for John Dalton to formulate Dalton's atomic theory?

 

Q19. What theory did Dalton propose about the structure of matter?

 

Q20. Which part of the Dalton’s atomic theory came from the law of constant proportions given by Proust?

 

Q21. What is meant by the term chemical formula?

 

Q22. How many atoms are present in a

(i) H2S molecule and

(ii) PO43– ion?

 

Q23. Mass of one atom of oxygen is

 

Q24. Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic mass of magnesium is 24g mol–1.

 

Q25. Define the atomic mass unit.

 

Q26. Why is it not possible to see an atom with naked eyes?

 

Q27. The visible universe is estimated to contain 1022 stars. How many moles of stars are present in the visible universe?

 

Q28. Does the solubility of a substance change with temperature? Explain with the help of an example.

 

Q29. What is mole?

 

Q30. What are polyatomic ions? Give examples.

 

Q31. How the size of atoms is measured?

Or

Write the relation between nanometer and metre.

 

Q32. How big are atoms?

 

Q33. What is molecular mass?

 

Q34. Hydrogen and oxygen combine in the ratio of 1:8 by mass to form water. What mass of oxygen gas would be required to react completely with 3 g of hydrogen gas? 

 

Q35. Write the molecular formulae of all the compounds that can be formed by the combination of following ions

Cu2+, Na+, Fe3+, Cl–, SO42- , PO43-

 

Q36. A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?

 

Q37. Compute the number of ions present in 5.85 g of sodium chloride.

 

Last modified: Tuesday, 25 May 2021, 6:21 PM