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प्रश्न
Give reason.
Acidic soil is treated with quick lime.
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उत्तर
If the soil is acidic it can be treated with base like quick lime, to make it neutral.
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संबंधित प्रश्न
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Miscible liquids having slightly different boiling points can be separated by the
- evaporation
- distillation
- fractional distillation
- sedimentation
FILL IN THE BLANK
........... electrolytes dissociate completely in aqueous state and allow large amount of electricity to flow through it.
Fill in the blank:
The substances formed as a result of a chemical reaction are called _______
State what you would observe when the following substance is heated in a glass test tube red lead.
Write the chemical reaction where the following changes are observed.
Colour change is noticed
Write the chemical reaction where the following changes are observed.
Precipitate is formed
Name the gases which turn moist red litmus blue.
Give a chemical test to distinguish between the following gases.
NH3 and HCl
Select the correct answer for the following options:
The black residue obtained on heating copper carbonate.
Give reason for the following:
Even though rusting is an exothermic reaction, the heat evolved when an iron nail rusts is unnoticeable.
Name the following:
The type of change physical or chemical involved – ‘during respiration in human beings’.
Give a suitable example with an equation to show the representation of a chemical reaction.
Give a balanced equation for the conversion of an ammonium salt to a basic gas.
______ occurs in the absence of air and in the presence of micro-organisms such as yeast.
Write the chemical reaction of baking soda with lemon.
Explain how the painting of an iron gate prevents it from rusting.
When carbon dioxide is passed through lime water ______.
______ is a chemical substance is used in whitewashing.
Define the following term:
Chemical change
