Advertisements
Advertisements
Question
Fill in the following blanks with suitable words:
Tiffin boxes are electroplated with .............. but car bumpers are electroplated with ............... to protect them from rusting.
Solution
Tiffin boxes are electroplated with tin but car bumpers are electroplated with chromium to protect them from rusting.
APPEARS IN
RELATED QUESTIONS
Explain why Iron sheets are coated with zinc during galvanization.
Write a chemical equation to show the process of corrosion of iron.
State two conditions for the rusting of iron.
In one method of rust prevention, the iron is not coated with anything. Which is this method?
A common metal which is highly resistant to corrosion is:
(a) iron
(b) copper
(c) aluminium
(d) magnesium
State under what conditions corrosion is faster ?
Complete the process of iron rusting by filling the blanks. Suggest a way to prohibit the process.
The iron rust is formed due to........................... reaction. Different
regions on iron surface become anode and cathode.
Reaction on anode region :
`F_e(s) → Fe^(2+) (aq) +2e^-`
Reaction on anode region :
`O_2(g) + 4H^+(aq) +............................ → 2H_2 O (l) `
When Fe2+ ions migrate from anode region they react with ................... to form Fe3+ ions.
A reddish coloured hydrated oxide is formed from ............... ions. It is called rust.
`2Fe_(3+) (aq) + 4H_2O(l) → ................. + 6H_+(aq) `
A way to prevent rusting ..................................................................
Find the odd man out:
What is done to prevent corrosion of metals?
Answer the following question.
List two properties of alloys.
Give reason.
Copper and brass utensils should be tinned.
Give a reason why rust turns moist red litmus blue.
Write a short note on Alloying.
When one of the metals in an alloy is mercury the alloy is called _______.
Find the odd one out and give its explanation.
Write scientific reason.
Coins are made from metals and alloys.
State two conditions necessary for rusting of iron.
Amalgam is an alloy of ____________.
Give an example of a chemical reaction for each of the following situations:
Sound is produced
