AIEEE 2003 | d and f Block Elements Question 233 | Chemistry

A red solid is insolvable in water. However it becomes soluble if some $$K{\rm I}$$ is added to water. Heating the red solid in a test tube results in liberation of some violet colored fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is :

$$Hg{{\rm I}_2}$$

$$HgO$$

$$P{b_3}{O_4}$$

$${\left( {N{H_4}} \right)_2}C{r_2}{O_7}$$

AIEEE 2003

MCQ (Single Correct Answer)

-1

Which one of the following statements is correct?

From a mixed precipitate of AgCl and AgI, ammonia solution dissolves only AgCl

Ferric ions give a deep green precipitate on adding potassium ferrocyanide solution

On boiling a solution having K⁺, Ca²⁺ and HCO₃ ions we get a precipitate of K₂Ca(CO₃)₂.

Manganese salts give a violet borax bead test in the reducing flame

AIEEE 2003

MCQ (Single Correct Answer)

-1

Which one of the following nitrates will leave behind a metal on strong heating?

Copper nitrate

Manganese nitrate

Silver nitrate

Ferric nitrate

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?