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प्रश्न
Define the following term:
Chemical change
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उत्तर
A chemical change is a permanent change in which the chemical composition of a substance is changed and one or more new substances with different chemical compositions and different properties are formed.
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संबंधित प्रश्न
Define catalyst.
Write the missing reactants and products and balance the equations.
NaOH + ............... `→` NaCI + ...................
What are oxides ?
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction reaction is the exact opposite of
- displacement reaction
- decomposition reaction
- oxidation reaction
- none of these
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
Name the type of chemical reaction shown by the following equation:
CaCO3 → CaO + CO2
When electric current is passed through acidulated water ______ of water takes place.
State the following reaction represent oxidation or reduction.
\[\ce{Fe++->Fe+++}\]
State whether the following reaction is oxidation or reduction.
\[\ce{Na->Na+}\]
Higher order Thinking question
A very hot glass on putting in cold water cracks. What does this change indicate?
