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IMPORTANT
Earn 100

paper acidified with dilute turns green when exposed to
(a)Carbon dioxide
(b)Sulphur trioxide
(c)Hydrogen sulphide
(d)Sulphur dioxide

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Important Questions on The d- and f-Block Elements
MEDIUM
JEE Main
IMPORTANT
How many of the following metal ions have similar value of spin only magnetic moment in gaseous state? ________
(Given: Atomic number

MEDIUM
JEE Main
IMPORTANT
Potassium dichromate acts as a strong oxidizing agent in acidic solution. During this process, the oxidation state changes from

EASY
JEE Main
IMPORTANT
The standard electrode potential () for & are and , respectively. The metal ions which can liberate from a dilute acid are

MEDIUM
JEE Main
IMPORTANT
The set of correct statements is:
(i) Manganese exhibits oxidation state in its oxide.
(ii) Ruthenium and Osmium exhibit oxidation in their oxides.
(iii) shows oxidation state which is oxidizing in nature.
(iv) shows oxidising nature in oxidation state.

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JEE Main
IMPORTANT
During the qualitative analysis of using dilute gas is evolved which turns solution (acidified with dilute ):

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JEE Main
IMPORTANT
oxidises in acidic and neutral/faintly alkaline solution, respectively to

MEDIUM
JEE Main
IMPORTANT
The correct order of basicity of oxides of vanadium is
