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प्रश्न
Writing a chemical reaction in brief by using chemical formulae is called as _______.
पर्याय
chemical change
chemical symbol
chemical equation
chemical reaction
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उत्तर
Writing a chemical reaction in brief by using chemical formulae is called as chemical equation.
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संबंधित प्रश्न
Why should a magnesium ribbon be cleaned before it is burnt in the air?
Write the balanced chemical equation for the following reaction.
\[\ce{Aluminium + Copper chloride -> Aluminium chloride + Copper}\]
Translate the following statement into a chemical equation and then balance the equation:
Phosphorus burns in oxygen to give phosphorus pentoxide.
Write a complete balanced equation for the following reaction:
\[\ce{Sulphur dioxide (gas) + Oxygen (gas) -> Sulphur trioxide (gas)}\]
Balance the following equation:
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Balance the following chemical equation:
\[\ce{C + CO2 -> CO}\]
Aluminium hydroxide reacts with sulphuric acid to form aluminium sulphate and water. Write a balanced equation for this reaction.
With the help of an appropriate example, justify that some of the chemical reactions are determined by a change in colour.
Give a chemical equation for the reaction involved in the above case.
Give one example of a chemical reaction characterised by the formation of a precipitate.
State one characteristic of the chemical reaction which takes place when quicklime is treated with water.
What do you understand by endothermic reactions?
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.
- What could be solid X? Write its chemical formula.
- What could be product Y? Write its chemical formula.
- What is the common name of the solution of Y which is used for testing carbon dioxide gas?
- Write chemical equation of the reaction which takes place on adding water to solid X.
- Which characteristic of chemical reactions is illustrated by this example?
A white precipitate will be formed if we add common salt solution to ______.
Explain the following reaction with one suitable example .
Decomposition reaction
Write the balanced equation for the following chemical reaction.
\[\ce{Barium chloride + Aluminium sulphate -> Barium sulphate + Aluminium chloride}\]
Write word equation for the following skeletal equation:
\[\ce{Na + O2 -> Na2O}\]
Balance the following chemical equation :
FeS + HCl → FeCl2 + H2S
Write your observation for the following chemical reaction and name the product formed:
When sugar is heated.
Balance the following equation .
N2 + O2 → NO
Balance the following equation :
Pb3O4 → PbO + O2
Balance the following equation. Also name the product formed.
`"Na"+ "H"_2 "O" → "NaOH"+ "H"_2`
Dry raisins were soaked in water for 2 hours, to determine the percentage of water absorbed by raisins. Before final weighing of swollen raisins, the extra water left on the surface of soaked raisins was removed by:
Write the chemical equation for the following word equation and balance them.
Carbon + Oxygen → Carbon dioxide
Write the balanced chemical equation of the following reaction.
Potassium permanganate + hydrochloric acid → potassium chloride + manganese chloride + chlorine + water
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate moles of salt formed.
Choose the correct alternative and rewrite the following sentence.
Which of the following is not required to find the pH of a given solution?
Write word equation for the following molecular equation:
\[\ce{H2 [g] + Cl2 [g] ->[sunlight] 2HCl}\]
Word equation:
State which form of energy is utilised in the above chemical reaction.
Give a balanced equation for addition of iron to copper [II] sulphate solution. State the change in colour seen.
\[\ce{2KClO3->[MnO2] 2KCl + 3O2[g] - is a balanced equation.}\]
State why the compound MnO2 is written above the arrow.
Balance the following simple equation:
Al + O2 → Al2O3
Balance the following simple equation:
KBr + Cl2 → KCl + Br2
Balance the following simple equation:
NaOH + Cl2 → NaCl + NaClO + H2O
Balance the following simple equation:
Fe2O3 + CO → Fe + CO2
With reference to a chemical equation state which of the statements 1 to 5 pertain to A or B.
A: Information provided by a chemical equation.
B: Limitations of a chemical equation.
- The nature of the individual elements.
- The speed of the reaction.
- The state of matter in which the substance is present.
- The completion of the reaction.
- The direction of the reaction.
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
CaC2 + N2 → 2CaCN2 + C
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
Cl2 + 2H2O + SO2 → 4HCl + H2SO4
Balance the given chemical reaction as per the instructions below.
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Make a list of the elements in the chemical equation.
Give the characteristic tests for the following gases :
- CO2
- SO2
- O2
- H2
What is a product in a chemical equation?
A student took a small amount of copper oxide in a conical flask and added dilute hydrochloric acid to it with constant stirring. He observed a change in colour of the solution.
- Write the name of the compound formed and its colour.
- Write a balanced chemical equation for the reaction involved.
