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We can see nearly ______ stars with the naked eye in the dark night.
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The brightness of stars depends on their ______ and ______ from the earth.
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The temperature of the star is determined by ______.
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Stars also appear to be in different colors depending on their composition of Gases.
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Briefly explain
- brightness
- color of the star.
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How are impure substances classified?
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| Group in the modern periodic table | Families |
| 1 | ______ |
| ______ | Transition metals |
| ______ | Boron family |
| 15 | ______ |
| 17 | ______ |
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The hydrogen atom does not have ______.
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Which subatomic particles have no charge?
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α, β, γ rays are during the ratio active decay ______ of an atom.
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Beryllium + α – rays → Carbon + ______.
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The stability of the nucleus is determined by the Neutron – Proton ratio.
Concept: undefined >> undefined
Polar solvents contain bonds between atoms with ______.
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______ & ______ atoms have similar electronegativities.
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Spot the error/correct the wrong statement:
Covalent compounds are soluble in polar solvents.
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Covalent compounds have a low melting point.
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Bases ionise in water to form ______ ions.
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Which of the following pairs are weak bases?
Concept: undefined >> undefined
Which of the following solution is soapy to touch?
Concept: undefined >> undefined
