Class 12ChemistryGeneral Principles and Processes of Isolation of ElementsMix Examples of General Principles and processes of Isolation of Elements
EasyWhich of the following statements is wrong?
- AHeating to a high temperature and then cooling suddenly,e.g.,by dipping in water,makes steel hard and brittle.
- BSteel can be softened by heating it to a high temperature for a prolonged time and then cooling slowly. This is called quenching.
- CTempering of hardened steel is done by heating it to just below red heat at controlled temperature and duration.
- DPhosphorus impurity makes steel ‘cold short’.
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Similar Questions
Give the correct order of initials $T$ or $F$ for following statements. Use $T$ if statement is true and $F$ if it is false.
$(i)$ Every mineral is an ore but every ore is not a mineral.
$(ii)$ Slag is a product formed during the extraction of metal by the combination of flux and impurities.
$(iii)$ Highly pure metals can be obtained by zone refining.
$(iv)$ Carnallite is an ore of magnesium and sodium.
$(i)$ Every mineral is an ore but every ore is not a mineral.
$(ii)$ Slag is a product formed during the extraction of metal by the combination of flux and impurities.
$(iii)$ Highly pure metals can be obtained by zone refining.
$(iv)$ Carnallite is an ore of magnesium and sodium.
Medium
View SolutionCopper matte is composed of . . . . . .
Select the incorrect statement.
Easy
View SolutionMatch List-$I$ with List-$II$ and select the correct answer using the codes given below the lists :
List-$I$ List-$II$ $(a)$ van Arkel method $1$. Manufacture of caustic soda $(b)$ Solvay process $2$. Purification of titanium $(c)$ Cupellation $3$. Manufacture of $Na_2CO_3$ $(d)$ Poling $4$. Purification of copper $ $ $5$. Refining of silver
Codes :
| List-$I$ | List-$II$ |
| $(a)$ van Arkel method | $1$. Manufacture of caustic soda |
| $(b)$ Solvay process | $2$. Purification of titanium |
| $(c)$ Cupellation | $3$. Manufacture of $Na_2CO_3$ |
| $(d)$ Poling | $4$. Purification of copper |
| $ $ | $5$. Refining of silver |
Codes :
Medium
View SolutionIdentify the correct statement from the following:
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