(B) Diamond is an allotrope of $Carbon$. Emerald is a variety of the mineral beryl $(Be_3Al_2Si_6O_{18})$ containing traces of chromium,which gives it

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(B) Diamond is an allotrope of $Carbon$. Emerald is a variety of the mineral beryl $(Be_3Al_2Si_6O_{18})$ containing traces of chromium,which gives it its green color. Therefore,Diamond is composed of $Carbon$ and Emerald is composed of $Alumina$ $(Al_2O_3)$ based silicates.

Class 12 Chemistry d-and f-Block Elements General Characteristics

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Diamond and Emerald are composed of which of the following respectively?

A
Carbon,Carbon
B
Carbon,Alumina
C
Carbon,Silica
D
Silica,Alumina

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d-and f-Block Elements

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General Characteristics

Higher second ionisation enthalpies than expected are observed for

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Assertion : The free gaseous $Cr$ atom has six unpaired electrons.
Reason : Half-filled $s$ orbital has greater stability.

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The metal$(s)$ which does/do not form amalgam is/are

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Elements $A$ and $B$ with their respective electronic configurations $3d^{10} 4s^1$ and $4d^{10} 5s^1$ in their outermost shell are

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The correct option with the order of melting points of the pairs $(Mn, Fe)$, $(Tc, Ru)$ and $(Re, Os)$ is $:$

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Diamond and Emerald are composed of which of the following respectively?

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Higher second ionisation enthalpies than expected are observed for

Assertion : The free gaseous $Cr$ atom has six unpaired electrons.Reason : Half-filled $s$ orbital has greater stability.

The metal$(s)$ which does/do not form amalgam is/are

Elements $A$ and $B$ with their respective electronic configurations $3d^{10} 4s^1$ and $4d^{10} 5s^1$ in their outermost shell are

The correct option with the order of melting points of the pairs $(Mn, Fe)$, $(Tc, Ru)$ and $(Re, Os)$ is $:$

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Assertion : The free gaseous $Cr$ atom has six unpaired electrons.
Reason : Half-filled $s$ orbital has greater stability.