JEE Main 2018 (Online) 16th April Morning Slot | d and f Block Elements Question 171 | 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⁺

JEE Main 2017 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

The pair of compounds having metals in their highest oxidation state is :

MnO₂ and CrO₂Cl₂

[NiCl₄]^2$$-$$ and [CoCl₄]^2$$-$$

[Fe(CN)₆]^3$$-$$ and [Cu(CN)₄]^2$$-$$

[FeCl₄]^$$-$$ and Co₂O₃

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