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प्रश्न
Complete and balance the following chemical equations
Na + H2 O →
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उत्तर
\[\ce{Na + H2O→2NaOH + H2↑}\]
APPEARS IN
संबंधित प्रश्न
How do the following help in bringing about a chemical change?
heat.
What do you observe when iron nail is kept in copper sulphate solution for sometime.
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
TRUE \ FALSE
Copper can displace iron from iron sulphate.
State four conditions necessary for chemical reactions to take place.
Fill in the blank:
The substances formed as a result of a chemical reaction are called _______
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Balance the following equation :
Fe + H2O → Fe3O4 + H2
Explain the following reaction with one suitable example of Displacement reaction.
Name the type of chemical reaction shown by the following equation:
NaOH + HCl → NaCl + H2O
Explain by writing a word equation.
Hard water gets softened on mixing with a solution of washing soda.
Write the chemical reaction where the following changes are observed.
Colour change is noticed
Give reason for the following:
Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.
State the original colour of the following substance and colour of residue obtained after heating.
Lead nitrate
What do you observe when H2S is passed through a lead nitrate solution.
Give a chemical test to distinguish between the following gases.
HCl and H2S
State the following reaction represent oxidation or reduction.
\[\ce{Ag->Ag+}\]
True or False. If false, give the correct answer.
Taking a glass of water and freezing it by placing it in the freezer is a chemical change.
The reaction of H2 gas with oxygen gas to form water is an example of ______.
