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प्रश्न
NPK are the primary nutrients for plants.
पर्याय
True
False
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उत्तर
NPK are the primary nutrients for plants- True.
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संबंधित प्रश्न
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
TRUE \ FALSE
Temperature at which a liquid starts boiling is known as the boiling point of that liquid. True or false ?
What are chemical reactions?
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
A colourless solution of calcium hydroxide in a test tube turns ______ on blowing in it through a blow tube for some time.
Explain by writing a word equation.
Respiration is a chemical change.
Explain by writing a word equation.
Limestone powder disappears on adding to dilute hydrochloric acids.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Water
When electric current is passed through acidulated water ______ of water takes place.
Give an example of the following chemical change.
Two solids combine to form a liquid
What do you understand by precipitation reaction? Explain with examples.
Name: Two carbonates do not produce carbon dioxide on heating.
State the original colour of the following substance and colour of residue obtained after heating.
Zinc carbonate
Give a chemical test to distinguish between the following gases.
NH3 and HCl
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
What is a chemical reaction?
Give balanced equation for the following conversion affected by heat alone on the substance:
Hydrated copper sulphate to sulphur dioxide
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc carbonate to zinc oxide
Match the following:
| 1. | Sodium Chloride | a. | CaSO41/2H2O |
| 2. | Calcium sulphate dihydrate | b. | C2H5Oh |
| 3. | Magnesium sulphate hydrate | c. | CaSO4.2H2O |
| 4. | Calcium sulphate hemihydrate | d. | NaCl |
| 5. | Phenol | e. | MgSO4.H2O |
How can we prevent rusting?
When milk is mixed with coffee decoction, the colour of milk and decoction changes due to ______.
