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प्रश्न
What kind of a change is associated with decaying of a plants?
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उत्तर
Decaying plants is associated with slow change and chemical change.
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संबंधित प्रश्न
How would you show that setting of curd is a chemical change?
What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.
Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.
\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Compounds, which in their molten state allow an electric current to pass through them are called
- electrolytes
- non-electrolytes
- non-conductors
- none of these
TRUE \ FALSE
A precipitation reaction takes place only in a solution.
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
How is precipitate formation in a chemical reaction indicated?
Name the type of chemical reaction shown by the following equation:
CaCO3 → CaO + CO2
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
To prevent rusting, a layer of ______ metal is applied on iron sheets.
When electric current is passed through acidulated water ______ of water takes place.
Explain,giving one example of the following chemical changes:
Reversible reaction
What do you understand by precipitation reaction? Explain with examples.
Name: Two nitrates that do not produce nitrogen dioxide on heating.
Complete the table given below.
| Heat on Zinc nitrate | Colour of residue |
State the following reaction represent oxidation or reduction.
\[\ce{Al->Al+++}\]
When lithium metal is placed in hydrochloric acid, _______ gas is evolved.
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change the colour of black tea by adding lemon juice to it.
(e) Churning of milk cream to get butter.
Give an example of a chemical reaction for the following situation:
A change in colour is observed
