EASY
Chemistry
IMPORTANT
Earn 100

When Cl2 water is dropwise added into KI solution, initially brown colouration appears, further on adding excess Cl2 water brown colouration disappears due to formation of colourless compound X predict oxidation state of central atom in compound X.

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Important Questions on The p-Block Elements

MEDIUM
Chemistry
IMPORTANT
In basic medium, XeO3 first combines with OH- to form X, which is slowly disproportionate to give Y, Xe and oxygen gas. Find the number of hybrid orbitals of central Xe atom of Y involved in bonding.
MEDIUM
Chemistry
IMPORTANT

How many of the following reactions (not balanced eqn) undergo disproportionation reaction?

i) NaOHCold & dil+Cl2

ii) NaOHCold & dil+F2

iii) NaOH+P4

iv) H3PO3Δ

v) NO2H2OHot 

vi) NaOH+ClO2

vii) HClO2OxidationAuto

viii) HNO2oxidationAuto

MEDIUM
Chemistry
IMPORTANT

Compound 2 and 1 are mixed in 1: 4 molar ratio. The mixture was subjected to ammonium molybdite test for phosphate estimation. The results of the test yielded a phosphate concentration of 36mM for the mixture. What is the concentration of compound 2 in mM in the mixture?

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MEDIUM
Chemistry
IMPORTANT
How many of the following form a soluble complex with excess of aqueous ammonia?
i) MgCl2
ii) FeCl3
iii) NiSO4
iv) CuCl2
v) CoCl3
vi) PbNO32
vii) AgNO3
viii) AlCl3
EASY
Chemistry
IMPORTANT
NH3 reacts with a gas fumes produced when methanol is passed through Cu tube at 573 K. The compound obtained is polycyclic. No of rings it contain =X. i.e., if it is monocyclic then X=1, of bicyclic X=2 or X cyclic. The number of Nitrogen atoms it has =Y. Find values of X & Y & Report your answer as X + Y.
MEDIUM
Chemistry
IMPORTANT
How many of the following molecules containing covalent bond between two atoms of the same kind

H2S2O3, H2S2O4, H2S2O5, H2S2O6, H2S2O7, H2S2O8, H2SO5