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प्रश्न
Write true or false
Decomposition of leaves is a fast change.
विकल्प
True
False
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उत्तर
False.
Decomposition of leaves is a slow change.
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संबंधित प्रश्न
Fill in the blank
Chemical change occurs as a result of __________ between two substances.
State whether the following is physical or chemical changes.
shaping a piece of glass —
Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water
Which of the following are physical changes and which are chemical changes ?
Freezing of water
Read the paragraph and note down the various types of changes it mentions.
It was nearing six o'clock in the evening. The sun was setting. A breeze was blowing. Leaves on the tree were shaking. Sahil was sitting in the courtyard, rolling balls of wet soil, and shaping them into various toys. Then he felt hungry and went into the house. Mother made a dough from wheat flour and fried purees. While eating hot purees, his attention was drawn outside the window. It had started raining. There was lightning, too. Sahil was enjoying his dinner in the dim light.
Select the chemical changes from the following list of changes
Boiling of milk.
In a solution of salt in water, water is the solute
Stretching gold coin into a ring is a ______ change.
Classify the following as physical or chemical properties
The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.
Iron pipes coated with zinc do not get rusted easily.
