Advertisements
Advertisements
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.
Advertisements
उत्तर
To prevent rusting, a layer of zinc metal is applied on iron sheets.
Reason:
Zinc is a non-corrosive metal. Therefore, a layer of zinc prevents rusting.
APPEARS IN
संबंधित प्रश्न
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
Complete and balance the following chemical equation:
\[\ce{Pb(NO3)2 ->[Heat]}\]
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
Write true or false :
No new substance is formed during a chemical reaction.
State what you would observe when the following substance is heated in a glass test tube red lead.
Name the type of chemical reaction shown by the following equation:
CaCO3 → CaO + CO2
Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.
Give an example of a reaction where the following are involved
Heat
Define an electrochemical reaction.
What do you observe when Cl2 is passed through potassium iodide (KI) solution.
Give a chemical test to distinguish between the following gases.
CO2 and SO2
Give a chemical test to distinguish between the following gases.
NH3 and SO2
What do you observe when CO2 is passed through lime water first and then a little in excess.
Distinguish by dilute sulphuric acid.
Copper and magnesium?
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A coloured substance which leaves a black residue and evolves two gases one of which is acidic and coloured and the other neutral and colourless.
Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.
NPK are the primary nutrients for plants.
Mention the various conditions required for a chemical reaction to occur.
When lithium metal is placed in hydrochloric acid, _______ gas is evolved.
