Very short answer type questions (1 mark each)
1. Name the person who introduced the modern atomic symbols for the first time.
2. What is the symbol for fluorine?
3. Atoms are represented by symbols. How are the molecules represented!
4. Express the mass of one atom of carbon-12 in atomic mass units.
5. Name the formula which gives the simplest atomic ratio of the various elements present in a compound.
6. Write the empirical formula of (a) diamond (b) graphite
7. What is the unit of molar mass?
8. What is meant by molar volume?
9. What is the value of molar volume of a gaseous substance under NTP conditions?
10. Identify the cation and anion present in the compound called potassium aluminium su
Short answer type questions (2 marks each)
Short answer type questions (3 marks each)
1. What is meant by the atomicity of a molecule? What is the atomicity of sulphur and phosphorus molecules under normal conditions?
2. What is the atomic mass unit? Is atomic mass unit a practical unit? Describe a practical unit for the amount of a chemical substance.
3. Define the term molecular mass. How does molecular mass differ from molar mass?
4. Define (a) molecular formula, (b) empirical formula.
5. How many molecules of water are there in 10 g of water?
6. Name the ions present in each of the following and also write their formulae.
Sodium oxide, Aluminium chloride, Sodium sulphide, Magnesium hydroxide.
Long answer type questions (5 marks each)
1. Write the two postulates of Dalton's atomic theory which are modified in the light of modern researches
2. State and explain the law of constant proportions by giving a suitable example.
3. What is the significance of molecular formula? What does the formula CO, signify?
4. Why is it not correct to write the molecular formula of an ionic compound?
5. How is the molecular formula of a compound related to its empirical formula?
1. Name the person who introduced the modern atomic symbols for the first time.
2. What is the symbol for fluorine?
3. Atoms are represented by symbols. How are the molecules represented!
4. Express the mass of one atom of carbon-12 in atomic mass units.
5. Name the formula which gives the simplest atomic ratio of the various elements present in a compound.
6. Write the empirical formula of (a) diamond (b) graphite
7. What is the unit of molar mass?
8. What is meant by molar volume?
9. What is the value of molar volume of a gaseous substance under NTP conditions?
10. Identify the cation and anion present in the compound called potassium aluminium su
Short answer type questions (2 marks each)
1 Why are Dalton's symbols not used in chemistry?
2. Define the term symbol of an element.
3. Define the term mole. What is the notation of the mole unit?
4. What is meant by the term molar mass?
5.. How is the molar mass of a compound calculated?
6.. How many molecules are there in one mole of a compound? What is this number called?
7 Will one mole of calcium weigh the same as one mole of carbon?
2. Define the term symbol of an element.
3. Define the term mole. What is the notation of the mole unit?
4. What is meant by the term molar mass?
5.. How is the molar mass of a compound calculated?
6.. How many molecules are there in one mole of a compound? What is this number called?
7 Will one mole of calcium weigh the same as one mole of carbon?
Short answer type questions (3 marks each)
1. What is meant by the atomicity of a molecule? What is the atomicity of sulphur and phosphorus molecules under normal conditions?
2. What is the atomic mass unit? Is atomic mass unit a practical unit? Describe a practical unit for the amount of a chemical substance.
3. Define the term molecular mass. How does molecular mass differ from molar mass?
4. Define (a) molecular formula, (b) empirical formula.
5. How many molecules of water are there in 10 g of water?
6. Name the ions present in each of the following and also write their formulae.
Sodium oxide, Aluminium chloride, Sodium sulphide, Magnesium hydroxide.
Long answer type questions (5 marks each)
1. Write the two postulates of Dalton's atomic theory which are modified in the light of modern researches
2. State and explain the law of constant proportions by giving a suitable example.
3. What is the significance of molecular formula? What does the formula CO, signify?
4. Why is it not correct to write the molecular formula of an ionic compound?
5. How is the molecular formula of a compound related to its empirical formula?
