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Balance the Following Equation: Na + O2 Na2o - Science

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प्रश्न

Balance the following equation:

Na + O2  Na2O

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उत्तर

 4Na + O2 → 2Na2O

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पाठ 1: Chemical Reactions and Equations - Exercise 1 [पृष्ठ १९]

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लखमीर सिंह Chemistry (Science) [English] Class 10
पाठ 1 Chemical Reactions and Equations
Exercise 1 | Q 15.01 | पृष्ठ १९

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संबंधित प्रश्‍न

What is a chemical equation? Explain with the help of an example.


State one characteristic of the chemical reaction which takes place when  quicklime is treated with water


Is Electrolysis of water an endothermic reaction or an exothermic reaction?


The chemical reaction between two substances is characterised by a change in colour from orange to green. These two substances are most likely to be:
(a) potassium dichromate solution and sulphur dioxide
(b) potassium permanganate solution and sulphur dioxide
(c) potassium permanganate solution  and lemon juice
(d) potassium dichromate solution and carbon dioxide.


The chemical reaction between quicklime and water is characterised by:
(a) evolution of hydrogen gas
(b) formation of slaked lime precipitate
(c) change in temperature of mixture
(d) change in colour of the product


Balance the following chemical equation:


Write word equation for the following skeletal equation:

\[\ce{Zn + HCl -> ZnCl2 + H2}\]


Write the balanced chemical equation of the following reaction.

sulphur + nitric acid→ sulphuric acid  + nitrogen dioxide + water.


\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]

0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate moles of acid required.


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

The chemical reactions in which heat is liberated are called endothermic reactions.


Write word equation for the following molecular equation:

\[\ce{N2 + 3H2 ⇌[Fe - 450°C][200 atoms] 2NH3 + \triangle}\]

Word equation:
State why [+ Δ] indication is seen after NH3.
State what 200 atmospheres – indicates.
State the function of Fe in the above reaction.


A chemical reaction is generally accompanied by certain external indications or characteristics. These include – change of – (a) colour (b) state (c) smell (d) evolution of gas (e) formation of precipitate (f) evolution or absorption of heat. With reference to change of colour – state the change in colour seen when the following are heated – mercury [II] oxide.


In certain reaction a change of state is observed i.e. solid to liquid, liquid to gas etc. – State the change of state of the products – to give the respective reactant.

\[\ce{2H2O ->[electric][current] 2H2 + O2}\]


Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.

Catalyst


Balance the following simple equation:

ZnS   +   O2  →  ZnO + SO2 


Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.

CaC2 + N2 → 2CaCN2 + C


In the chemical equation the _______ are written on the left-hand side.


What are products? Explain with the help of example.


Which among the following statement(s) is(are) true? ‘Exposure of silver chloride to sunlight for a long duration turns grey due to

  1. The formation of silver by the decomposition of silver chloride.
  2. sublimation of silver chloride.
  3. decomposition of chlorine gas from silver chloride.
  4. oxidation of silver chloride.

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