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प्रश्न
Find the odd man out:
Turmeric, Methyl Orange, Rose petals, Beetroot.
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उत्तर
Methyl orange
Turmeric, rose petals and beetroot are natural indicators, while methyl orange is a synthetic indicator.
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संबंधित प्रश्न
Write the balanced chemical equation for the following reaction.
\[\ce{Aluminium + Copper chloride -> Aluminium chloride + Copper}\]
What does the symbol (aq) represent in a chemical equation?
How will you indicate the following effect in a chemical equation?
Exothermic reaction
Balance the following equation:
\[\ce{H2O2 -> H2O + O2}\]
What are the various ways in which a chemical equation can be made more informative? Give examples to illustrate your answer.
What do you understand by exothermic reactions?
When the solution of substance X is added to a solution of potassium iodide, then a yellow solid separates out from the solution.
- What do you think substance X is likely to be?
- Name the substance which the yellow solid consists of.
- Which characteristic of chemical reactions is illustrated by this example?
- Write a balanced chemical equation for the reaction which takes place. Mention the physical states of all the reactants and products involved in the chemical equation.
Write word equation for the following skeletal equation:
\[\ce{KClO3 -> KCl + O2}\]
Write word equation for the following skeletal equation:
\[\ce{Na + O2 -> Na2O}\]
Write word equation for the following skeletal equation:
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Write your observation for the following chemical reaction and name the product formed:
When sugar is heated.
Balance the following equation Also name the product formed.
`"K" + "CI"_2 → "KCI"`
Balance the following equation. Also name the product formed.
FeCI2 + CI2 → FeCI3
While performing the experiment with raisins to determine the percentage of water absorbed by them, a student made following measurements:
Mass of water in the beaker = 40 g
Mass of raisins before soaking = 5 g
Mass of raisins after soaking for 2 hours = 8 g
Mass of water left in the beaker after the experiment = 35 g
The percentage of water absorbed by raisins is:
Complete the following equation:
CH4 + O2 —>
Show the formation of Na2O by the transfer of electrons.
Balance the following equation:
MnO2 + HCl → MnCl2 + H2O + Cl2
What is the valency of :
carbon in CH4
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate moles of chlorine gas formed.
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate the mass of chlorine gas formed.
Define: Endothermic reaction
When a potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed.
Write the balanced chemical equation for this reaction.
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Pressure
Name the following:
A catalyst which increases the rate of a chemical reaction.
Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
Pb(NO3)2 + 2NH4OH → 2NH4N03 + Pb(OH)2↓
An element X is trivalent. Write the balanced equation for the combustion of X in oxygen.
Balance the following simple equation:
\[\ce{N2 + H2 <=> NH3}\]
Write a balanced equation for the following word equation:
Potassium bromide + Chlorine → Potassium chloride + Bromine
Give a balanced equation by the partial equation method, [steps are given below].
Oxidation of Lead [II] Sulphide by Ozone
- Ozone first decomposes to give molecular oxygen & nascent oxygen.
- Nascent oxygen then oxidises lead [II] sulphide to lead [II] sulphate.
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
NaOH + CO2 → Na2CO3 + H2O
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
3CuO + NH3 → 3Cu + 3H2O + N2
In the chemical equation the _______ are written on the left-hand side.
Complete the given chemical reaction.
\[\ce{CuSO_{4(aq)} + Fe_{(s)} ->}\]______ + ______
What are reactants? Explain with the help of example.
Give the characteristic tests for the following gases :
- CO2
- SO2
- O2
- H2
When aqueous solutions of potassium iodide and lead nitrate are mixed an insoluble substance separates out. The chemical equation for the reaction involved is:
