AIEEE 2003 | d and f Block Elements Question 185 | Chemistry

For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass over a liquid metal which does not solidify before glass. The metal used can be :

tin

sodium

magnesium

mercury

AIEEE 2003

MCQ (Single Correct Answer)

-1

What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?

$$Cr_2O^{2-}_7$$ and H₂O are formed

$$CrO^{2-}_4$$ is reduced to +3 state of Cr

$$CrO^{2-}_4$$ is oxidized to +7 state of Cr

Cr³⁺ and $$Cr_2O^{2-}_7$$ are formed

AIEEE 2003

MCQ (Single Correct Answer)

-1

The atomic numbers of vanadium (V), Chromium (Cr), manganese (Mn) and iron (Fe) are respectively 23, 24, 25 and 26. Which one of these may be expected to have the highest second ionization enthalpy?