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प्रश्न
Explain the following reaction with one suitable example of Double decomposition reaction.
उत्तर
Double decomposition reaction : In this reaction two compounds in solution state react with each other to form two new substances by exchanging their radicals, e.g. Reaction of sodium hydroxide with dilute hydrochloric acid.
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संबंधित प्रश्न
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
How do the following help in bringing about a chemical change?
light.
How do the following help in bringing about a chemical change?
heat.
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
Write the missing reactants and products and balance the equations.
................+ HCI `→` NaCI + `"H"_2"O"` + .........................
FILL IN THE BLANK
The new substances formed during a chemical reaction are called the ..................
FILL IN THE BLANK
Positively charged ions are called ........
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
Write a short note on the information derived from a balanced chemical equation.
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
Write true or false :
No new substance is formed during a chemical reaction.
Write true or false :
When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .
Explain the term reactant and product giving examples.
Give an example of a reaction where the following are involved:
Solution
Give an example of the following chemical change.
A reaction where colour change is noticed
Name: A greenish-yellow gas.
Give a chemical test to distinguish between the following gases.
H2 and CO2
Give a chemical test to distinguish between the following gases.
HCl and H2S
Explain the term ‘chemical reaction’ with special reference to – ‘reactants’ and ‘products’.
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.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
Write a note on the following:
Curdling of milk
Why is spoiling food a chemical change?
______ is the chemical name of slaked lime.
______ is a chemical substance is used in whitewashing.
Collect information about the types of fuels used for cooking in your area. Discuss with your teachers/parents/others which fuels are less polluting and why.
