Which of the following statements is/are incorrect
(I) Filter paper moistened with cadmium acetate and lead acetate turn black and yellow respectively, when brought in contact with `H_(2)S` gas.
(II) Sulphites in presence of Zinc, reacts with dilute `H_(2)SO_(4)` to liberate `H_(2)S` gas.
(III) Stability of carbonates decrease with increasing metallic character.
(IV) Borax bead test is responded generally by p and d block metal salts.
(V) Sodium chloride on heating with aqueous solution of `K_(2)Cr_(2)O_(7)` and concentrated `H_(2)SO_(4)` produced white fumes.

Answer

4(I),(III),(IV) &(V)

Explanation

(I) `Pb^(+2)+H_(2)S to underset("black")(PbS)darr`
`Cd^(+2)+H_(2)S to underset("yellow")(CdS darr)`
(II) `Zn+H_(2)SO_(4)+SO_(3)^(-) to H_(2)S uarr +Zn^(2+)`
(III) Stability of carbonate `prop` metallic character
(IV) Borax bead test is responded by d-block metal salt.
(V) `NaCl+K_(2)Cr_(2)O_(7)+H_(2)SO_(4) to CrO_(2)Cl_(2) uarr +Cr^(3+) +SO_(4)^(2-)`