AIEEE 2003 | d and f Block Elements Question 194 | 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

The radius of La³⁺ (Atomic number of La = 57) is 1.06 Å. Which one of the following given values will be closest to the radius of Lu³⁺ (Atomic number of Lu = 71) ?

1.60 Å

1.40 Å

0.85 Å

1.60 Å

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