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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
MATCH THE COLUMNS
| 1 . `H_2` + `CI_2` `→` 2HCI | a. displacement reaction |
| 2. `2FeCI_3`+ `H_2` `→` `2FeCI_2` +2HCI` | b. addition of an electronegative redical |
| 3. Fe + `CuSO_4` `→``FeSO_4` +Cu` | c. removal of an electronegative redical |
| 4. `2H_2O` +`4NO_2`+`O_2` `→` `4HNO_3` | d.reduction by adding hydrogen |
| 5. 3Fe +`3CI_2` `→` `2FeCI_3` | e.electrolysis of water |
| 6. `FeCI_3`+ 3NaOH `→``Fe(OH)_3``↓`+NaCI | F.double decomposition,precipitation reaction |
| 7.`2H_2O` `→` `2H_2``↑`+`O_2` | e. combination or synthesis reaction |
TRUE \ FALSE
Weak electrolytes dissociate partially in their aqueous or fused state.
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
The conversion of ferrous sulphate to ferric sulphate is ______ reaction.
Give an example of a reaction where the following are involved
Light
Write the chemical reaction where the following changes are observed.
Gas is evolved
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
What do you observe? When
Sodium chloride solution is added to silver nitrate solution.
Complete and balance the following reaction:
NaCl(aq) + AgNO3(aq) →
What do you observe when Cl2 is passed through potassium iodide (KI) solution.
Distinguish by dilute sulphuric acid.
Sodium Sulphite and sodium carbonate?
Give examples of exothermic reactions i.e. heat evolved in each of the following:
(a) reaction between a solid and a liquid
(b) reaction between two gases
Give two examples of exothermic reactions seen in everyday life.
State the following reaction represent oxidation or reduction.
\[\ce{Cl- ->Cl}\]
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
Mention the various conditions required for a chemical reaction to occur.
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.
The changes in which new substance with new chemical properties are formed are ______.
Chemical change is a temporary change.
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.
Which of the following is a chemical change?
Explain how the painting of an iron gate prevents it from rusting.
