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प्रश्न
Raisins are wiped off gently before final weighing with the help of
विकल्प
a filter paper
a cotton piece
a cloth piece
a polythene piece
उत्तर
a filter paper
Raisins are wiped off gently before final weighing with the help of a filter paper.
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संबंधित प्रश्न
With the help of an appropriate example, justify that some of the chemical reactions are determined by Change in colour
Give chemical equation for the reaction involved in the above case.
Give one example of an endothermic reaction.
A metal X forms a salt XSO4. The salt XSO4 forms a clear solution in water which reacts with sodium hydroxide solution to form a blue precipitate Y. Metal X is used in making electric wire and alloys like brass.
(a) What do you think metal X could be?
(b) Write the name, formula and colour of salt XSO4.
(c) What is the blue precipitate Y?
(d) Write a chemical equation of the reaction which takes place when salt XSO4 reacts with sodium hydroxide solution. Give the state symbols of all the reactants and products which occur in the above equation.
What happens when silver nitrate solution is added to sodium chloride solution?
Write the equation for the reaction which takes place.
Write your observations and name the product when
Iron nails are added to an aqueous solution of copper sulphate.
Name the substances that are getting oxidised and reduced in the process.
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.
Give word equation for the following chemical reaction and give the names of the product formed.
Zn + 2HC1→ ZnCl2 + H2
Name the following:
The silvery residue obtained on heating mercury [II] oxide.
What are products? Explain with the help of example.
