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प्रश्न
Write an Explanation.
Balanced equations
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उत्तर
A balanced equation is a symbolic representation of a chemical reaction where the number of atoms for each element is identical on both the reactant (left) and product (right) sides.
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संबंधित प्रश्न
Balance the following chemical equation.
\[\ce{BaCl2 + H2SO4 -> BaSO4 + HCl}\]
Write complete balanced equation for the following reaction:
Calcium (solid) + water (liquid) 
Calcium Hydroxide (solution) + Hydrogen (gas)
Balance the given equation:
AI2(SO4)3 +NaOH 
AI(OH)3 + Na2SO4
Balance the given equation:
BaCI2 + H2SO4 
BaSO4 + HCI
When hydrogen is passed over copper oxide, copper and steam are formed. Write a balanced equation for this reaction and state which of the chemicals are compounds.
Aluminium burns in chlorine to form aluminium chloride (AlCl3). Write a balanced chemical equation for this reaction.
When a mixture of gases X and Y is compressed to 300 atm pressure and then passed over a catalyst consisting of a mixture of zinc oxide and chromium oxide (heated to a temperature of 300°C), then an organic compounds Z having the molecular formula CH4O is formed. X is a highly poisonous gas which is formed in appreciable amounts when a fuel burns in a limited supply of air; Y is a gas which can be made by the action of a dilute acid on an active metal; and Z is a liquid organic compound which can react with sodium metal to produce hydrogen gas.
(a) What are X, Y and Z?
(b) Write a balanced chemical equation of the reaction which takes place when X and Y combine to form Z. Indicate the conditions under which the reaction occurs.
Name the various types of chemical reactions.
The removal of oxygen from a substance is called:
(a) oxidation
(b) corrosion
(c) reduction
(d) rancidity
A white precipitate will be formed if we add common salt solution to:
(a) Ba(NO3)2 solution
(b) KNO3 solution
(c) AgNO3 solution
(d) Mg(NO3)2 solution
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.
Explain the following reaction with one suitable example .
Decomposition reaction
Write symbolic representation for the following word equation and balance them :
Iron + Sulphur → Iron sulphide.
Balance the following equation. Also name the products formed.
`"Mg" + "O"_2 → "MgO"`
Balance the following equation. Also name the product formed.
PbCO3 → PbO +CO2
Balance the equation stepwise.
NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + H2O(l)
Show the formation of Na2O by the transfer of electrons.
Why should an equation be balanced? Explain with the help of a simple equation.
Write the balanced chemical equation of the following reaction.
silver nitrate → silver + nitrogen dioxide + oxygen
Write the balanced chemical equation of the following reaction.
iron pyrites(FeS2) + oxygen → ferric oxide + sulphur 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 chlorine gas formed.
What is thermit process? Where is this process used? Write a balanced chemical equation for the reaction involved.
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 – lead [IV] 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.
NH3 + HCl ⇌ NH4Cl
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Electrical energy
Give reason for the following:
Silver salts are kept in dark coloured bottles.
Balance the following simple equation:
Mg + N2 → Mg3N2
Balance the following simple equation:
H2 + Cl2 → HCl
Balance the following simple equation:
H2S + Cl2 → S + HCl
Balance the following simple equation:
KHCO3 → K2CO3 + H2O + CO2
Balance the following simple equation:
Mg + CO2 → MgO + C
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
6NaOH + 3Cl2 → 6NaCl + NaClO3 + 3H2O
A dilute ferrous sulphate solution is gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?
What is a reactant in a chemical equation?
What is a product in a chemical equation?
