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प्रश्न
Write an Explanation.
Balanced equations
उत्तर
A chemical equation in which the number of atoms of the elements in the reactants is same as the number of atoms of those elements in the productsis called a balanced chemical equation.
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संबंधित प्रश्न
Write the balanced chemical equation for the following reaction.
\[\ce{Zinc + Silver nitrate -> Zinc nitrate + Silver}\]
2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube. When the contents are warmed, a gas evolves which is bubbled through a soap solution before testing. Write the equation of the chemical reaction involved and the test to detect the gas. Name the gas which will be evolved when the same metal reacts with dilute solution of a strong acid.
How will you indicate Exothermic reaction in a chemical equation?
Balance the following equation:
Na + O2 
Na2O
Balance the given equation:
AI(OH)3 
AI2O3 +H2O
Balance the given equation:
HNO3 + Ca(OH)2 
Ca(NO3)2 + H2O
Fill in the following blank with suitable word:
A solution made in water is known as an ........... solution and indicated by the symbol ...........
Write a balanced chemical equation for the process of photosynthesis giving the physical states of all the substances involved and the conditions of the reaction.
With the help of an appropriate example, justify that some of the chemical reactions are determined by Change in colour
Give chemical equation for the reaction involved in the above case.
Is Electrolysis of water an endothermic reaction or an exothermic reaction?
An acid which can decolourise purple coloured potassium permanganate solution is:
(a) sulphuric acid
(b) citric acid
(c) carbonic acid
(d) hydrochloric acid
When water is added gradually to a white solid X, a hissing sound is heard and a lot of heat is produced forming a product Y. A suspension of Y in water is applied to the walls of a house during white washing. A clear solution of Y is also used for testing carbon dioxide gas in the laboratory.
(a) What could be solid X? Write its chemical formula.
(b) What could be product Y? Write its chemical formula.
(c) What is the common name of the solution of Y which is used for testing carbon dioxide gas?
(d) Write chemical equation of the reaction which takes place on adding water to slid X.
(e) Which characteristic of chemical reactions is illustrated by this example?
A colourless lead salt, when heated, produces a yellow residue and brown fumes.
(a) Name the lead salt.
(b) Name the brown fumes.
(c) Write a chemical equation of the reaction involved.
Name the type of chemical reaction shown by the following equation:
2Mg+ O2 → 2MgO
Balance the following chemical equation :
Na2CO3 + HCl → NaCI + H2O + CO2
Write symbolic representation for the following word equation and balance them :
Carbon + Oxygen → Carbon dioxide.
Balance the following equation :
Pb3O4 → PbO + O2
To determine the percentage of water absorbed by raisins, raisins are soaked in water for:
Show the formation of Na2O by the transfer of electrons.
What is a chemical equation? Why it is necessary to balance it?
Balance the following equation:
Ca + N2 → Ca3N2
Balance the following equation:
P + HNO3 → NO2 + H2O + H3PO4
Write the balanced chemical equation of the following reaction.
copper + nitric acid → copper nitrate + nitric oxide + water
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate the volume of chlorine gas formed at S.T.P.
Choose the correct alternative and rewrite the following sentence.
Which of the following is not required to find the pH of a given solution?
The chemical reactions in which heat is liberated are called endothermic reactions.
Considering the relationship in the first pair, complete the second paie :
AgCI : White :: CuI2 : ___________
Answer the following question.
What is observed when 2 mL of dilute hydrochloric acid is added to 1 g of sodium carbonate taken in a clean and dry test tube? Write a chemical equation for the reaction involved.
What is thermit process? Where is this process used? Write a balanced chemical equation for the reaction involved.
In certain reaction an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in the following reaction involving addition of:
Copper [II] sulphate to sodium hydroxide.
Representation of the results of a chemical change – is a chemical equation.
For the equation: FeCl3 + 3NH4OH 3NH4Cl + Fe(OH)3 ↓
Answer the following:
Write the word equation for the above molecular equation.
Give word equation for the following chemical reaction and give the names of the product formed.
ZnCO3 → ZnO + CO2
Balance the following simple equation:
ZnS + O2 → ZnO + SO2
Balance the following simple equation:
H2 + Cl2 → HCl
Balance the following simple equation:
Fe + Cl2 → FeCl3
Balance the following simple equation:
KBr + Cl2 → KCl + Br2
Balance the following simple equation:
CaO + HCl → CaCl2 + H2O
Which of the following are exothermic processes?
- Reaction of water with quick lime
- Dilution of an acid
- Evaporation of water
- Sublimation of camphor (crystals)
