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प्रश्न
Name the type of chemical reaction shown by the following equation:
NaOH + HCl → NaCl + H2O
उत्तर
NaOH + HCl → NaCl + H2O => Double decomposition reaction .
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
pressure.
What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.
Name three biochemical catalysts found in the human body.
Complete and balance the following chemical equations:
\[\ce{Pb(NO3)2->[heat]}\] _________
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
FILL IN THE BLANK
A .............. change is a temporary change.
What are chemical reactions?
How is precipitate formation in a chemical reaction indicated?
Define chemical reaction.
Explain the following reaction with one suitable example of Displacement reaction.
A solution of a substance ‘X’ is used for white washing write the reaction of the substance ‘X’ named in (a) above with water.
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
To prevent rusting, a layer of ______ metal is applied on iron sheets.
| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
Give an example of a reaction where the following are involved:
Close contact
Give an example of the following chemical change.
Two gases combine to form white solid
Write the chemical reaction where the following changes are observed.
Precipitate is formed
What do you observe? When
Barium chloride is added to sodium sulphate solution
What do you observe? When
Water is added to the quick lime.
Complete and balance the following reaction:
Pb(NO3)2 + KI →
What do you observe when HCI is passed through a silver nitrate solution.
Give a chemical test to distinguish between the following gases.
H2 and CO2
Write your observation and a balanced equation in the case of the following substances being heated.
Zinc carbonate.
Select the correct answer for the following options:
The pale blue precipitated obtained when copper [II] sulphate reacts with sodium hydroxide.
Give reason for the following:
A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution.
Complete the table given below.
| Heat on sodium chloride | Colour imparted to flame during flame test |
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
The percentage composition of Nitrogen in Ureas is ______.
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
Heat may evolve or be absorbed during a ______ change.
