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प्रश्न
Write true or false :
Hydrogen sulphide has rotten egg smell .
पर्याय
True
False
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उत्तर
True
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
heat.
How is a strong electrolyte different from a weak electrolyte?
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.
Give an example of a reaction where the following are involved
Heat
Complete and balance the following reaction:
Pb(NO3)2 + KI →
Give a chemical test to distinguish between the following gases.
H2 and CO2
Distinguish by heating the following in dry test tubs.
Zinc nitrate and copper nitrate.
Write your observation and a balanced equation in the case of the following substances being heated.
Copper carbonate.
Select the correct answer for the following options:
The basic gas obtained when two gases react in presence of a catalyst and the reaction is exothermic.
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
State the following reaction represent oxidation or reduction.
\[\ce{Fe++->Fe+++}\]
Give a balanced equation for the conversion of a soluble lead salt to an insoluble lead salt – formed as a white precipitate.
Circle the odd one out. Give reason for your choice
Higher order Thinking question
A very hot glass on putting in cold water cracks. What does this change indicate?
________ is a chemical substance which alters the speed of a chemical reaction.
Discuss how acid rain occurs due to emission of smoke from vehicles and industries?
A reaction between an acid and a base is called ______.
Chemical change is a temporary change.
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.
