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प्रश्न
Which of the following is a chemical change?
विकल्प
Twinkling of stars
Cooking of vegetables
Cutting of fruits
Boiling of water
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उत्तर
Cooking of vegetables
Explanation:
Cooking of vegetables is a chemical change.
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
catalyst .
Complete and balance the following chemical equations:
Fe `"SO"_4` + NaOH `→`
(aq.) (aq.)
State four conditions necessary for chemical reactions to take place.
State four conditions necessary for a chemical reaction to take place.
What do you observe? When
Barium chloride is added to sodium sulphate solution
What is observed in performing the following :
| Hydrogen | Oxygen | Carbon dioxide | Chlorine | |
| Litmus test | ||||
| Apply a burning splint to the gas | ||||
| Colour of gas | colourless | colourless | colourless | greenish-yellow |
| Odour of gas |
Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.
State the following reaction represent oxidation or reduction.
\[\ce{Ag->Ag+}\]
State whether the following reaction is oxidation or reduction.
\[\ce{Na->Na+}\]
Burning of paper is a ______ change.
