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प्रश्न
NPK are the primary nutrients for plants.
विकल्प
True
False
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उत्तर
NPK are the primary nutrients for plants- True.
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संबंधित प्रश्न
Name three biochemical catalysts found in the human body.
What are oxides ?
FILL IN THE BLANK
In a ............ change, new substances are formed.
Explain the type of reactions on the basis of the direction of reaction.
State four conditions necessary for a chemical reaction to take place.
Name the type of chemical reaction shown by the following equation :
Fe2O3 + 2Al → Al2O3 + 2Fe
Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.
When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
Write your observation and a balanced equation in the case of the following substances being heated.
Copper carbonate.
Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
Give reason for the following:
A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution.
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
Explain the term chemical reaction with special reference to reactants and products.
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What kind of a change is associated with decaying of a plants?
Rusting of iron is ______.
Chemical changes are important in our day-to-day life. Give examples.
Write a note on the following:
Curdling of milk
