Silver halides are used in photography because:

When borax is heated with cobalt oxide,which of the following compounds produces a blue-colored bead?

Which of the following statements regarding copper salts is not true?

Stainless steel contains $..........$ $\%$ $Cr$.

Identify correct statements from below:
$A$. The chromate ion is square planar.
$B$. Dichromates are generally prepared from chromates.
$C$. The green manganate ion is diamagnetic.
$D$. Dark green coloured $K_2MnO_4$ disproportionates in a neutral or acidic medium to give permanganate.
$E$. With increasing oxidation number of transition metal,ionic character of the oxides decreases.
Choose the correct answer from the options given below:

Compounds of $d-$block elements can stabilize in higher oxidation states only with $F$ and $O$. Which statement is incorrect?