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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
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
Define precipitation reaction.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction reaction is the exact opposite of
- displacement reaction
- decomposition reaction
- oxidation reaction
- none of these
How is a strong electrolyte different from a weak electrolyte?
Explain the following reaction with one suitable example of Double decomposition reaction.
Explain by writing a word equation.
Bubbles are seen on adding lemon juice to baking soda.
Write the chemical reaction where the following changes are observed.
Colour change is noticed
Give a chemical test to distinguish between the following gases.
HCl and Cl2
Distinguish by dilute sulphuric acid.
Sodium sulphide and sodium sulphite?
Give a word equation for the following reaction.
A compound which on heating shows – colour change from brown to yellow.
Give reason for the following:
The catalytic oxidation of sulphur dioxide to sulphur trioxide is represented by a double arrow {⇌}
between the reactants and products, formed in the chemical reaction.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A white solid which evolves two colourless gases which on cooling combine and condense on the cooler parts of the test tube.
Complete the table given below.
| Heat on copper carbonate | Test for gas evolved |
Complete the table given below.
| Heat on sodium chloride | Colour imparted to flame during flame test |
Explain the term chemical reaction with special reference to reactants and products.
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to sodium sulphite.
Select the correct answer from the options given below:
State the gaseous product formed, when
An active metal reacts with dilute sulphuric acid.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Calcium hydroxide.
Chemists identify gypsum as a natural indicator.
Define the following term:
Chemical change
