Advertisements
Advertisements
प्रश्न
Define chemical reaction.
Advertisements
उत्तर
Any chemical change in matter that involves its transformation into one or more new substances is called a chemical reaction.
संबंधित प्रश्न
How do the following help in bringing about a chemical change?
light.
Name three biochemical catalysts found in the human body.
Complete and balance the following chemical equations
Na + H2 O →
Give reason.
Acidic soil is treated with quick lime.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Compounds, which in their molten state allow an electric current to pass through them are called
- electrolytes
- non-electrolytes
- non-conductors
- none of these
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
Explain the following reaction with one suitable example of Combination reactions .
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 the following chemical change.
Two gases combine to form white solid
Complete and balance the following reaction:
\[\ce{NH3 + O2 ->[\Delta]}\]
Give a word equation for the following reaction.
An exothermic reaction where both the reactants are gases, one of which is oxygen.
Give balanced equation for the following conversion affected by heat alone on the substance:
Ammonium dichromate to nitrogen
Give a balanced equation for the conversion of an ammonium salt to a basic gas.
Silver metal can displace hydrogen gas from nitric acid.
The water we drink is a combination of hydrogen and oxygen.
On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.
(a) Is this a physical or a chemical change?
(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.
Which of the following statement is incorrect for a chemical reaction?
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think formation of rust from iron is a chemical change?
Write a note on the following:
Curdling of milk
What is thermochemical reactions?
