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प्रश्न
Why do we need to balance chemical equations?
Why do we balance a chemical equation?
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उत्तर
A chemical equation needs to be balanced so as to make the number of atoms of the reactants equal to the number of atoms of the products.
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संबंधित प्रश्न
Find the odd man out:
Turmeric, Methyl Orange, Rose petals, Beetroot.
Complete and balance the following equation:
NaOH + ............ 
Na2 SO4 + H2O
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 products.
State one characteristic of the chemical reaction which takes place when lemon juice is added gradually to potassium permanganate solution.
What do you understand by endothermic reactions?
The metal M reacts vigorously with water to form a solution S and a gas G. The solution S turns red litmus to blue whereas gas G, which is lighter than air, burns with a pop sound. Metal M has a low melting point and it is used as a coolant in nuclear reactors.
(a) What is metal M?
(b) What is solution S? Is it acidic or alkaline?
(c) What is gas G?
(d) Write a balanced chemical equation for the reaction which takes place when metal M reacts with water.
(e) Is this reaction exothermic or endothermic?
Write word equation for the following skeletal equation:
\[\ce{CO + O2 -> CO2}\]
A student weighed some raisins and recorded the weight as ‘x’. She then soaked the raisins in distilled water. After about 2 hours she removed the raisins, wiped them dry and weighed them again, and recorded that as ‘y’. The percentage of water absorbed by raisins may be determined using the relationship.
Show the formation of Na2O by the transfer of electrons.
Balance the following equation:
NO2 +H2O → HNO2 + HNO3
Why should an equation be balanced? Explain with the help of a simple equation.
Write the balanced chemical equation of the following reaction. potassium bicarbonate + sulphuric acid → potassium sulphate + carbon dioxide + water
Write the balanced chemical equation of the following reaction.
potassium bicarbonate + sulphuric acid → potassium sulphate + carbon dioxide + water
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 – copper carbonate.
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.
\[\ce{C +2S -> CS2}\]
Name the following:
Two gases which react under pressure in presence of a catalyst at elevated temperatures to give a gaseous product.
Give an example of a chemical equation in which two reactants form:
one product
Balance the following simple equation:
NO + O2 → NO2
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
CaC2 + N2 → 2CaCN2 + C
