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प्रश्न
A chemical reaction is often accompanied by external indications or characteristics.
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उत्तर
A chemical reaction is accompanied by a change in colour of reactants and products
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........... electrolytes dissociate completely in aqueous state and allow large amount of electricity to flow through it.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Sodium chloride
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Water
Distinguish by heating the following in dry test tubs.
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(b) reaction between two gases
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Two chemical species X and Y combine together to form a product P which contains both X and Y
\[\ce{X + Y -> P}\]
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(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition
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______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.
