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Define gram molecular mass of a substance. How much is the gram molecular mass of oxygen ?
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If sulphur exists as S8 molecules, calculate the number of moles in 100 g of sulphur. (S = 32 u)
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What is meant by the ‘molar mass’ of a substance ? State the unit in which molar mass is usually expressed.
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Calculate the molar masses of the following substances. Write the results with proper units.
- Ozone molecule, O3
- Ethanoic acid, CH3COOH
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The mass of one molecule of a substance is 4.65 × 10–23 g. What is its molecular mass ? What could this substance be ?
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The mass of one steel screw is 4.11g. Find the mass of one mole of these steel screws. Compare this value with the mass of the Earth (5.98 × 1024kg). Which one of the two is heavier and by how many times?
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What is the SI prefix for each of the following multiples and submultiples of a unit?
- 103
- 10–1
- 10–2
- 10–6
- 10–9
- 10–12
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What are ionic and molecular compounds? Give examples.
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The formula unit mass of Ca3 (PO4)2 is ————.
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Write the formulae for the following and calculate the molecular mass for each one of them.
- Caustic potash
- Baking powder
- Limestone
- Caustic soda
- Ethanol
- Common salt
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Differentiate between rough and smooth endoplasmic reticulum. How is endoplasmic reticulum important for membrane biogenesis?
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Fractional distillation is suitable for the separation of miscible liquids with a boiling point difference of about 25 K or less. What part of the fractional distillation apparatus makes it efficient and possess an advantage over a simple distillation process. Explain using a diagram.
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One of the following processes is not a step involved in the water-cycle operating in nature
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The term “water-pollution” can be defined in several ways. Which of the following statements does not give the correct definition?
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There is mass mortality of fishes in a pond. What may be the reasons?
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To solve the food problem of the country, which among the following is necessary?
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Which one of the following species of the honey bee is an Italian species?
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Which one of the following nutrients is not available in fertilizers?
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