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Two elements sometimes can form more than one compound.
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Give any two examples for heterodiatomic molecules.
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Derive the relationship between Relative molecular mass and Vapour density.
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______ is a relative periodic property.
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Across the period, ionic radii ______
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Ionic radius increases across the period from left to right.
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The general molecular formula of alkynes is ______
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______ compounds decolourize bromine water.
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Biodegradable detergents are made of ______ chain hydrocarbons.
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Answer the following question using the data given below:
- Assertion: Alkanes are saturated hydrocarbons.
- Reason: Hydrocarbons consist of covalent bonds.
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Give an account of a vascular bundle of dicot stem.
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Pharyngeal ganglion in leech is a part of ______
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What does CNS stand for?
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Match the following.
| Column I | Column II |
| a. Newton’s I law | propulsion of a rocket |
| b. Newton’s II law | Stable equilibrium of the body |
| c. Newton’s III law | Law of force |
| d. Law of conservation of Linear momentum | Flying nature of bird |
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How are the home appliances connected in general, in series or parallel. Give reasons.
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Why does the sky appear in blue colour?
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The effective resistance of three resistors connected in series is lesser than the lowest of the individual resistances.
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What happens to the resistance, as the conductor is made thicker?
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Explain why, the ceilings of concert halls are curved.
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