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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
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction reaction is the exact opposite of
- displacement reaction
- decomposition reaction
- oxidation reaction
- none of these
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
Negatively charged ions are called ..........
TRUE \ FALSE
The evolution of a gas during a chemical reaction is shown by an arrow pointing downwards. True or false ?
How is a strong electrolyte different from a weak electrolyte?
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Sodium chloride
Name: Gas with rotten egg smell.
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.
Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].
________ is a chemical substance which alters the speed of a chemical reaction.
A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
Chemical change is a temporary change.
Burning of paper is the best example of ______ change.
Water boiling into water vapour is an example of chemical change.
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
Which of the following is a chemical change?
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Can you change rust back into iron by some simple method?
