STD 12 - 4. d and f- block elements — JEE STD 11 Science — Question

 $Al_{(S)}+3Ag^+_{(aq)}\,(0.10\, M) \to  Al^{+3}_{(aq)}\, (0.30\, M)+3Ag_{(S)}$,

the measured voltage $(E_{cell})$ is $1.50\, volt$. Calculate $E_{cell}^o$ ........... $\mathrm{volt}$

Given : $\frac{{2.303\,RT}}{F} = 0.06\,;\,\log \,3 = 0.48$

(Equilibrium constants for the reaction in water and benzene are $K_{Water}$ $K_{Benzene}$)

Which of the following is/are true about $\mathrm{A}^{\prime}, \mathrm{B}^{\prime}, \mathrm{C}^{\prime}$ and $\mathrm{D}^{\prime}$ ?

$A$. Order of atomic radii: $\mathrm{B}^{\prime}<\mathrm{A}^{\prime}<\mathrm{D}^{\prime}<\mathrm{C}^{\prime}$

$B$. Order of metallic character: $\mathrm{B}^{\prime}<\mathrm{A}^{\prime}<\mathrm{D}^{\prime}<\mathrm{C}^{\prime}$

$C$. Size of the element : $\mathrm{D}^{\prime}<\mathrm{C}^{\prime}<\mathrm{B}^{\prime}<\mathrm{A}^{\prime}$

$D$. Order of ionic radii : $\mathrm{B}^{\prime+}<\mathrm{A}^{\prime+}<\mathrm{D}^{\prime+}<\mathrm{C}^{\prime+}$

Choose the correct answer from the options given below :

$Fe _{3} O _{4}( s )+4 CO ( g ) \rightarrow 3 Fe ( l )+4 CO _{2}( g )$

when $4.640 \,kg$ of $Fe _{3} O _{4}$ and $2.520 \,kg$ of $CO$ are allowed to react then the amount of iron (in $g$ ) produced is $....$

[Given : Molar Atomic mass $\left( g\, mol ^{-1}\right): Fe =56$

Molar Atomic mass $\left( g \,mol ^{-1}\right): 0=16$

Molar Atomic mass $\left( g\, mol ^{-1}\right):= C =12$

$(i)$ $\left[ FeF _{6}\right]^{3-}$

$(ii)$ $\left[ Co \left( NH _{3}\right)_{6}\right]^{3+}$

$(iii)$ $\left[ NiCl _{4}\right]^{2-}$

$(iv)$ $\left[ Cu \left( NH _{3}\right)_{4}\right]^{2+}$