If ${\left[Cu{\left(H_{2}O\right)}_4\right]}^{2+}$  absorbs a light of wavelength 600nm d-d transition, then the value of octahedral crystal field splitting energy for ${\left[Cu{\left(H_{2}O\right)}_6\right]}^{2+}$  will be_________* 10^-21J. (Nearest Integer)

(Given: h = 6.63 * 10^-34 Js and c = 3.08 * 10⁸ ms^-1)

Kindly consider the following 

Magnetic moment (in BM) of Cu²⁺ ion is

K₂Cr₂O₇ + H₂O₂ + H₂SO_{4 $\underset{conditions}{\overset{ether cold}{\to }}$} <!-- [if gte mso 9]><xml> </xml><![endif]-->compound 'X' X is a chromium compound, what is the oxidation state of chromium in compound 'X'.

Alkaline KMnO oxidises lodide to a particular product (A). Determine the oxidation state of lodine in compound (A).

Which of the following pair will be formed by the decomposition of KMnO₄?