JEE Main 2019 (Online) 9th January Evening Slot | d and f Block Elements Question 196 | Chemistry

When XO₂ is fused with an alkali metal hydroxide in presence of an oxidizing agent such as KNO₃ ; a dark green product is formed which disproportioates in acidic solution to afforda dark purple solution. X is :

JEE Main 2018 (Online) 16th April Morning Slot

MCQ (Single Correct Answer)

-1

The incorrect statement is :

Cu²⁺ salts give red coloured borax bead test in reducing flame.

Cu2⁺ and Ni²⁺ ions give black precipitate with H₂S in presence of HCl solution.

Ferric ion gives blood red color with potasium thiocyanate.

Cu²⁺ ion gives chocolate coloured preciitate with potassium ferrocyanide solution.

JEE Main 2017 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

Which of the following ions does not liberate hydrogen gas on reaction with dilute acids ?

Ti²⁺

V²⁺

Cr²⁺

Mn²⁺

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