Ncert Solutions Chemistry Class 12th

Factual
(A) Magnalium contain Al and Mg
(B) Bell metal ⇒ Cu and Sn
(C) Gun metal ⇒ Cu, Sn and Zn
(D) Chrome steel ⇒ Fe and Cr.

x = 4

y = 6

z = 6

Ans. (3)

$C_v=\frac{3R}{2}$  

AC  polytropic P $\propto$  V

$\Rightarrow P.V^{-1}=constant$            

$C_{AC}=C_V+\frac{R}{1-\left(-1\right)}=2R$

AB isobaric

$C_{AB}=C_P=\frac{5R}{2}$       

  $\therefore \frac{Q_{AC}}{Q_{AB}}=\frac{C_{AC}}{C_{AB}}\left[?\Delta Tsameforboth\right]$

$=\frac{2R}{\left(\frac{5R}{2}\right)}=\frac{4}{5}=0.8$           

(i)  give NO₂   (ii) NH₄NO₃         (iii) gives NO₂     (iv) Give NO₂      (v) give NO₂       (vi) Given N₂O

(vii) Gives NO₂       (viii) Gives NO₂  (ix) Gives NO

A, B and C can be precipitated by HCl as well as H₂S as their insoluble chlorides and sulphides.

(D) Sn⁺² can be precipitated by H₂S but not by HCl

$S{n}^{+2}+2HCl\to SnC{l}_2\left(soluble\right)$

DiBAL-H is electron deficient reducing agent as Burane and readily reduces electron rich sp.

The slag formed is CaSIO₃ which is lighter and has less melting point.