Chemistry

K₂Cr₂O₇ + H₂O₂ + H₂SO₄->  + K₂SO₄ + H₂O compound 'X' is ->CrO₅

Oxidation state of chromium = +6.

A. Vitamin B₁₂– Co

B.  Wilkinson catalyst –Rh ( [Rh (PPh₃)₃Cl])

C.  Ziegler-Natta catalyst –Ti (TiCl₄ +Al (C₂H₅)₃)

D.  Haemoglobin – Fe

Ionisation enthalpy increases in a period. Z dominates over screening effect (s) in a period as Z_eff. increases.

Proteins on hydrolysis gives α-amino acid because α-amino acids are building block of proteins. It is also fact that amino acids contain both –NH₂ and –COOH group.

Electronegativity generally decreases as we move down the group but Pb has higher electronegativity than Sn.

C non-metal

Si and Ge->metalloids

Sn and Pb->metals

E.N. of Sn 1.8, Pb = 1.9

Na+ C + N + S ®NaSCN

Fe³⁺ + SCN^– $\stackrel{}{\to }$ $\underset{Bloodred}{{\left[Fe\left(SCN\right)\right]}^{2+}}$

(A) Fluorspar                     –    CaF₂

(B) Cryolite                 –    Na₃ [AlF₆]

(C) Bauxite                 –    Al₂O₃.2H₂O

(D) Dolomite              –    MgCO₃.CaCO₃

$p_{H_2}=P_T{\chi }_{H_2}$  (P_T = total pressure)

(  ${\chi }_{H_2}$ = mole fraction of H₂)

$p_{O_2}=P_T{\chi }_{O_2}$ ( ${\chi }_{O_2}$  = mole fraction of O₂)

$\frac{p_{H_2}}{p_{O_2}}=\frac{{\chi }_{H_2}}{{\chi }_{O_2}}=\frac{n_{H_2}}{n_{O_2}}$

$n_{H_2}=\frac{1}{2}$  mol

$n_{O_2}=\frac{1}{32}$
$\frac{p_{H_2}}{p_{O_2}}=\frac{1}{2*1}=32$

$\frac{p_{H_2}}{p_{O_2}}=\frac{32}{2}=\frac{16}{1}$