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प्रश्न
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.
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उत्तर
To prevent rusting, a layer of zinc metal is applied on iron sheets.
Reason:
Zinc is a non-corrosive metal. Therefore, layer of zinc prevents rusting.
APPEARS IN
संबंधित प्रश्न
Define catalyst.
Complete and balance the following chemical equations:
Zn + `"H"_2"SO"_4` `→`
(dil)
TRUE \ FALSE
Copper can displace iron from iron sulphate.
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
Fill in the blank:
The substances formed as a result of a chemical reaction are called _______
Write true or false :
When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .
State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 + Cu
Complete the statement by filling the gap using an 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)
An ______ is drawn in between the reactants and products while writing the equation for a chemical reaction.
Explain by writing a word equation.
Respiration is a chemical change.
Explain by writing a word equation.
Bubbles are seen on adding lemon juice to baking soda.
Complete and balance the following reaction:
NaCl(aq) + AgNO3(aq) →
Complete and balance the following reaction:
\[\ce{Pb(NO3)2 ->[\Delta]}\]
Select the correct answer for the following options:
The pale blue precipitated obtained when copper [II] sulphate reacts with sodium hydroxide.
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
State the following reaction represent oxidation or reduction.
\[\ce{Fe++->Fe+++}\]
Limestone contains ______ mainly.
Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings
______ occurs in the absence of air and in the presence of micro-organisms such as yeast.
