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Class 11 · Chemistry · Some Basic Concepts of Chemistry
How many grams of sodium hydroxide are needed to prepare 250 cm3 of a 0.1 M solution? (Na = 23, O = 16, H = 1)
3 marksMediumNumerical
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7 questions
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Class 11 · Chemistry · Some Basic Concepts of Chemistry
Calculate the mass of 3.011 × 1023 molecules of water. (H = 1, O = 16)
3 marksMediumNumerical
- Answer available
Class 11 · Chemistry · Some Basic Concepts of Chemistry
Distinguish between molarity and molality, and state which is independent of temperature.
3 marksMediumShort answer
- Answer available
Class 11 · Chemistry · Some Basic Concepts of Chemistry
A compound contains 40% carbon, 6.7% hydrogen and 53.3% oxygen. Its molar mass is 180 g. Find its empirical and molecular formulae.
3 marksMediumNumerical
- Answer available
Class 11 · Chemistry · Some Basic Concepts of Chemistry
Calculate the molarity of a solution containing 4 g of sodium hydroxide in 500 cm3 of solution. (Na = 23, O = 16, H = 1)
3 marksMediumNumerical
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Class 11 · Chemistry · Some Basic Concepts of Chemistry
State the law of conservation of mass and the law of constant proportions.
3 marksMediumShort answer
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Class 11 · Chemistry · Some Basic Concepts of Chemistry
Calculate the number of moles in 5.6 g of nitrogen gas. (N = 14)
3 marksMediumNumerical