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प्रश्न
Giving examples, state the difference between balanced and unbalanced chemical equations.
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उत्तर
| Sr. No. | Balanced chemical equation | Unbalanced chemical equation |
| 1. | A balanced chemical equation has an equal number of atoms of different elements on the sides of reactants and products. | An unbalanced chemical equation has an unequal number of atoms of one or more elements in the reaction. |
| 2. | In a balanced chemical equation, the sum of the masses of the reactants is equal to the sum of the masses of the products. | In an unbalanced chemical equation, the sum of the masses of the reactants is not equal to the sum of the masses of the products. |
| 3. | It obeys the law of conservation of mass. | It does not obey the law of conservation of mass. |
| 4. | Example: \[\ce{Zn + H2SO4 -> ZnSO4 + H2}\] | Example: \[\ce{H2 + O2 -> H2O}\] |
APPEARS IN
संबंधित प्रश्न
Correct and balance the following equation:
\[\ce{N + H -> NH3}\]
Write a complete balanced equation for the following reaction:
\[\ce{Calcium (solid) + Water (liquid) -> Calcium hydroxide (solution) + Hydrogen (gas)}\]
Give one example of a chemical reaction characterised by the formation of a precipitate.
With the help of an appropriate example, justify that some of the chemical reactions are determined by a change in temperature.
Give a chemical equation for the reaction involved in the above case.
One of the following is an exothermic reaction. This is:
The removal of oxygen from a substance is called ______.
Why do we need to balance chemical equations?
Balance the following chemical equation :
Na2CO3 + HCl → NaCI + H2O + CO2
Write symbolic representation for the following word equation and balance them :
Calcium oxide + Water → Calcium hydroxide
Balance the following equation. Also name the product formed.
`"KCIO"_3 → "KCI" +"O"_2`
What is the limitation of the reaction given in question 2?
(a) Give only one suitable chemical test to identify the following gases.
- Ammonia
- Sulphur dioxide
- Hydrogen Chloride
- Chlorine
- Carbon Dioxide
- Oxygen
- Hydrogen
(b) Select a basic gas mentioned in Q.1 (a). How is the basic nature suspected?
(c)Select acidic gases from the gases mentioned in Q.1 (a). How is the acidic nature suspected?
(d) State the gas responsible for bleaching action.
(e)Which gas turn blue cobalt chloride paper light pink?
Match column A with column B.
| Column A | Column B |
| (a) Blue salt changes to white and then black | (i) Ammonium dichromate |
| (b) Orange coloured compound changes to green. | (ii) Iodine |
| (c) Red compound changes to brown and then yellow. | (iii) Zinc Nitrate |
| (d) White to yellow when hot and white when cold. | (iv) Copper sulphate |
| (e) Violet solid changes to violet vapours. | (v) Red Lead |
Write word equation for the following molecular equation:
CaO + H20 → Ca (OH)2 + Δ
Word equation:
State why [+ Δ ] is not written in the reaction, if ZnO reacts with H2O.
Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
\[\ce{ZnCo3->[\triangle] ZnO + CO2}\]
\[\ce{2KClO3->[MnO2] 2KCl + 3O2[g] - is a balanced equation.}\]
State why the compound MnO2 is written above the arrow.
Balance the following simple equation:
KBr + Cl2 → KCl + Br2
Write a balanced equation for the following word equation:
Potassium nitrate → Potassium nitrite + Oxygen
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.
Dil. HCl is added to Zn granules. How will you prove that chemical change has taken place here? Support your response with two arguments.
