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प्रश्न
NPK are the primary nutrients for plants.
पर्याय
True
False
उत्तर
NPK are the primary nutrients for plants- True.
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संबंधित प्रश्न
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
What do you observe when :
an iron nail is kept in tap water for few days
Write true or false :
No new substance is formed during a chemical reaction.
When electric current is passed through acidulated water ______ of water takes place.
Give an example of a reaction where the following are involved
Heat
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
What is a chemical change? Give two examples of chemical change?
Name: Two carbonates do not produce carbon dioxide on heating.
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium dichromate.
Name the following:
The type of change physical or chemical involved – ‘during respiration in human beings’.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of water to quicklime.
Complete the table given below.
| Heat on copper carbonate | Test for gas evolved |
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Ammonium dichromate.
The chemical change is ______.
When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.
(a) Is this a physical or a chemical change?
(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.
The chemical formula of rust is ______.
Magnesium + oxygen → magnesium oxide.
2Mg + O2 → 2Mg O
Collect information about the types of fuels used for cooking in your area. Discuss with your teachers/parents/others which fuels are less polluting and why.
