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IMPORTANT
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K2Cr2O7 paper acidified with dilute H2SO4 turns green when exposed to

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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:V,23; Cr,24; Fe,26; Ni,28)

V3+, Cr3+, Fe2+, Ni3+

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 (M3+/M2+) for V, Cr, Mn & Co are -0.26 V, - 0.41 V, +1.57 V and +1.97 V, respectively. The metal ions which can liberate H2 from a dilute acid are
MEDIUM
JEE Main
IMPORTANT

The set of correct statements is:

(i) Manganese exhibits +7 oxidation state in its oxide.

(ii) Ruthenium and Osmium exhibit +8 oxidation in their oxides.

(iii) Sc shows +4 oxidation state which is oxidizing in nature.

(iv) Cr shows oxidising nature in +6 oxidation state.

MEDIUM
JEE Main
IMPORTANT
During the qualitative analysis of SO32- using dilute H2SO4,SO2 gas is evolved which turns K2Cr2O7 solution (acidified with dilute H2SO4):
MEDIUM
JEE Main
IMPORTANT
KMnO4 oxidises I- in acidic and neutral/faintly alkaline solution, respectively to