Ncert Solutions Chemistry Class 12th

Impurities present in electrolytic refining of blister Cu, removed as anode mud

= Sb, Se, Te, Ag, Au, Pt

Ans. = 6

Given are the oxide of alkali and alkaline earth metals which are ionic in nature.

Simple oxide are Li₂O, CaO, MgO and K₂O.

Peroxide is Na₂O₂ and superoxide is KO₂.

All simple oxides are diamagnetic as it has no unpaired electron.

Effective number of atom in C.C.P

$\therefore =\frac{1}{8}*8+\frac{1}{2}*6$     

= 4

Number of octahedral void = 4

Number of cations = 4

Number of anion = 4

Formula of compound = A₄B₄

Empirical formula = AB

Ans. x = 1

$\left(\frac{x}{m}\right)=K{P}^{1/n}$           

$\frac{10}{1}=K{\left(100\right)}^{1/n}................\left(1\right)$     

$\frac{15}{1}=K{\left(200\right)}^{1/n}................\left(2\right)$

$\frac{V}{1}=K{\left(300\right)}^{1/n}...............\left(3\right)$

Dividing (2) by (1)

$\frac{15}{10}={\left(\frac{2}{1}\right)}^{1/n}$ = (2)^1/n

$\frac{V}{10}=10^{0.279}$

$V=10*10^{0.279}=10^{1.279}=10^x$

$\therefore x=1.279=127.91*10^{-2}\approx 128*10^{-2}$

Ans. = 128

$C_2{H}_{7}N+\left(2x+\frac{y}{2}\right)CuO\to xC{O}_2+\frac{y}{2}{H}_{2}O+\frac{Z}{2}{N}_2+\left(2x+\frac{y}{2}\right)Cu$

$C_2{H}_7{N}_1+\left(2*2+\frac{7}{2}\right)CuO\to 2C{O}_2+\frac{7}{2}{H}_{2}O+\frac{1}{2}{N}_2+\left(2*2+\frac{7}{2}\right)Cu$              

$\therefore y=7$              

Ans. = 7

Kindly Consider the following Image

Kindly consider the following Image 

Novolac is linear polymer of o-hydroxymethyphenol

La⁺² (z = 57) = 5d¹

Ce⁺² (z = 58) = 4f²

Nd⁺² (z = 60) = 4f⁴

Yb⁺² (z = 70) = 4f¹⁴

Yb⁺² has no unpaired electrons thus diamagnetic in nature.

Non-linear and symmetrical Cr-O-Cr bond due to resonance.