Ncert Solutions Chemistry Class 12th

$\left[Ag{\left(N{H}_3\right)}_2\right]\left[Ag{\left(CN\right)}_2\right]contains{\left[Ag{\left(N{H}_3\right)}_2\right]}^{+}and{\left[Ag{\left(CN\right)}_2\right]}^{-}$

 ln ${\left[Ag{\left(N{H}_3\right)}_2\right]}^{+},$  oxidation state of Ag = +1

$ln{\left[Ag{\left(CN\right)}_2\right]}^{-}$   , oxidation state Ag = +1

Hence; sum of oxidation state = 2

Mass of empty cylinder = 14.8 kg

Mass of cylinder when full = 29 kg

Mass of gas in cylinder when filled; W₁ = 29 – 14.8 = 14.2 kg

Mass of gas in cylinder after using, W₂ = 23 – 14.8 = 8.2 kg

Initial pressure ; P₁ = 3.47 atm

Final pressure ; P₂ =?

Using

  $PV=\frac{W}{M}RT$

$P_{1}V=\frac{W_1}{M}RT..........\left(I\right)$              

$P_{2}V=\frac{W_2}{M}RT...........\left(II\right)$                 

$\frac{P_1}{P_2}=\frac{W_1}{W_2}$                

$\frac{3.47}{P_2}=\frac{14.2}{8.2}$                

P₂ = atm

Glyptal, Dacron & PHBV are polyesters.

Novalac is copolymer of phenol & formaldehyde but not polyesters.

Electrophilic addition of bromine to an alkene is anti-addition, in which cis-alkene gives two enantiomers and trans – alkene gives meso form

Here; trans-but-2-ene will give meso products

Na/H₂ can not reduce a functional group as Na does not behaves as catalyst here.

Stability order of oxides (X₂O) is,

l₂O > Cl₂O > Br₂O

Bonds of halogen & oxygen are covalent due to less EN difference.

Stability of (I - O) bond is higher due to less polarity and that of (Cl-O) bond is higher due to multiple bonding.