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प्रश्न
Write true or false :
No new substance is formed during a chemical reaction.
विकल्प
True
False
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उत्तर
False
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संबंधित प्रश्न
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
Fill in the blank.
The formation of gas bubbles in a liquid during a reaction is called ......................
Write the missing reactants and products and balance the equations.
NaOH + ............... `→` NaCI + ...................
Give reason .
A person suffering from acidity is advised to take an antacid.
FILL IN THE BLANK
Negatively charged ions are called ..........
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 + Cu
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
To prevent rusting, a layer of ______ metal is applied on iron sheets.
What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
A colourless solution of calcium hydroxide in a test tube turns ______ on blowing in it through a blow tube for some time.
Give reason for the following:
Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
What do you understand by 'chemical reaction'?
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Calcium hydroxide.
When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.
The percentage composition of Nitrogen in Ureas is ______.
On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.
(a) Is this a physical or a chemical change?
(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.
Which of the following is a chemical change?
Write the equation for the process of formation of rust.
How can we prevent rusting?
