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प्रश्न
Dry raisins were soaked in water for 2 hours, to determine the percentage of water absorbed by raisins. Before final weighing of swollen raisins, the extra water left on the surface of soaked raisins was removed by:
विकल्प
Gently rubbing with cotton cloth
Hot air blower
Dry cotton wool
Filter paper
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उत्तर
Not in Current Syllabus
The raisins after being soaked in water are dried on a piece of filter paper in order to remove the excess water present on their surface.
The Correct Answer is D
संबंधित प्रश्न
Giving examples, state the difference between balanced and unbalanced chemical equations.
Rewrite the following information in the form of a balanced chemical equation:
Magnesium burns in carbon dioxide to form magnesium oxide and carbon.
When potassium nitrate is heated, it decomposes into potassium nitrite and oxygen. Write a balanced equation for this reaction and add the state symbols of the reactants and products.
Give one example of an endothermic reaction.
Balance the following chemical equation :
Na2CO3 + HCl → NaCI + H2O + CO2
Write the chemical equation for the following word equation and balance them.
Calcium + Nitrogen → Calcium nitride
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate the mass of salt formed.
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.
Name the following:
The silvery residue obtained on heating mercury [II] oxide.
\[\ce{2KClO3->[MnO2] 2KCl + 3O2[g] - is a balanced equation.}\]
State what is a ‘balanced equation’.
