Question : Iron nails become ______ after being dipped in copper sulphate solution.
Option 1: bluish
Option 2: greenish
Option 3: greyish
Option 4: brownish
Correct Answer: brownish
Solution : The correct option is brownish.
After being dipped in copper sulfate solution, iron nails turn brownish because the reaction creates iron compounds like iron(III) oxide (rust). Copper ions can be released into the solution and iron compounds can be formed as a result of the reaction between iron and copper sulfate, which can displace copper.
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Question : Which of the following is used for the preparation of Dynamite?
Option 1: Methyl alcohol
Option 2: Iron oxide
Option 3: Nitroglycerin
Option 4: Copper sulphate
Question : Corundum is an ore of:
Option 1: aluminium
Option 2: silver
Option 3: copper
Option 4: iron
Question : Which material is used in the manufacturing of electric heater coil?
Option 1: Copper
Option 2: Iron
Option 3: Nickel
Option 4: Nichrome
Question : Which of the following are the main components of stainless steel?
Option 1: Iron and carbon
Option 2: Silver
Option 3: Iron, chromium and nickel
Option 4: Iron and nickel
Question : The hardness of the water is commonly measured in terms of:
Option 1: calcium carbonate equivalents
Option 2: calcium sulphate equivalents
Option 3: magnesium carbonate equivalents
Option 4: magnesium sulphate equivalents
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