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प्रश्न
In the chemical equation the _______ are written on the left-hand side.
विकल्प
products
reactants
element
catalyst
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उत्तर
In the chemical equation the reactants are written on the left-hand side.
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संबंधित प्रश्न
Balance the following chemical equation.
\[\ce{NaCl + AgNO3 -> AgCl + NaNO3}\]
Find the odd man out:
Turmeric, Methyl Orange, Rose petals, Beetroot.
Complete and balance the following equation:
CA (OH)2 + ............. 
CaCO3 + H2O
Correct and balance the following equation:
Ca + H2O 
CaOH + H
Balance the given equation:
Mg(OH)2 + HCI MgCI + H2O
Balance the given chemical equation:
C + CO2 → CO
What do you understand by exothermic reactions?
Give one example of 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
When metal X is treated with a dilute acid Y, then a gas Z is evolved which burns readily by making a little explosion.
(a) Name any two metals which can behave like metal X.
(b) Name any two acids which can behave like acid Y.
(c) Name the gas Z.
(d) Is the gas Z lighter than or heavier than air?
(e) Is the reaction between metal X and dilute acid Y, exothermic or endothermic?
(f) By taking a specific example of metal X and dilute acid Y, write a balanced chemical equation for the reaction which takes place. Also indicate physical states of all the reactants and products.
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?
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.
Name the type of chemical reaction shown by the following equation:
2Mg+ O2 → 2MgO
Balance the following equation. Also name the product formed.
`"CO" + "O"_2 → " CO"_2`
Balance the following equation. Also name the product formed.
CO2 + C → CO
Balance the following equation. Also name the product formed.
FeCI2 + CI2 → FeCI3
Complete the following equation:
CH2 + H5OH `("Hot Conc." H_2SO_4)/`>
To determine the percentage of water absorbed by raisins, raisins are soaked in water for:
Balance the equation stepwise.
SO2(g) + H2S(aq) → S(s) + H2O(l)
Balance the following equation:
MnO2 + HCl → MnCl2 + H2O + Cl2
Write the balanced chemical equation of the following reaction.
aluminium carbide + water → aluminium hydroxide + methane
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate moles of acid required.
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.
NH3 + HCl ⇌ NH4Cl
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Pressure
Name the following:
Two non-metal which react explosively when brought in close contact.
Balance the following simple equation:
ZnS + O2 → ZnO + SO2
Balance the following simple equation:
H2 + Cl2 → HCl
Balance the following simple equation:
CaO + HCl → CaCl2 + H2O
Write a balanced equation for the following word equation:
Potassium bicarbonate → Potassium carbonate + Water + Carbon dioxide
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.
Fill in the blank with the correct word from the options given below:
A chemical equation is a shorthand form for a _______ change.
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
Na2SO3 + HCl → 2NaCl + H2O + SO2
Write an Explanation.
Balanced equations
What are reactants? Explain with the help of example.
Which of the following are exothermic processes?
- Reaction of water with quick lime
- Dilution of an acid
- Evaporation of water
- Sublimation of camphor (crystals)
Give the characteristic tests for the following gases :
- CO2
- SO2
- O2
- H2
