MCQ
Which solution among following give blue colour, if Cu foil is added in solution :
- A$KNO _3$
- ✓$AgNO _3$
- C$Zn \left( NO _3\right)_2$
- D$ZnSO _4$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$xBrO_3\,^-+ yCr^{+3} + zH_2O \to Br_2 + CrO_4 ^{-2} + H^+$
the coefficients $x, y, z$ are