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Give reasons for the following
Elevation of the boiling point of 1 M KCl solution is nearly double than that of 1 M sugar solution.
Concept: Abnormal Molar Masses
An element 'X' (At. mass = 40 g mol-1) having f.c.c. the structure has unit cell edge length of 400 pm. Calculate the density of 'X' and the number of unit cells in 4 g of 'X'. (NA = 6.022 × 1023 mol-1)
Concept: Number of Atoms in a Unit Cell
An analysis shows that FeO has a non-stoichiometric composition with formula Fe0.95O. Give reason.
Concept: Physical Properties of the Transition Elements (d-block)
Complete and balance the following chemical equations
`Fe^(2+) + MnO_4^(-) + H^+ ->`
Concept: Physical Properties of the Transition Elements (d-block)
Complete and balance the following chemical equations
`MnO_4^(-) + H_2O + I^(-) ->`
Concept: Physical Properties of the Transition Elements (d-block)
Give reasons:
E° value for the Mn3+/Mn2+ couple is much more positive than that for Fe3+/Fe2+.
Concept: Physical Properties of the Transition Elements (d-block)
Give reasons Iron has the higher enthalpy of atomization than that of copper.
Concept: Physical Properties of the Transition Elements (d-block)
Give reasons: Sc3+ is colourless in aqueous solution whereas Ti3+ is coloured.
Concept: Physical Properties of the Transition Elements (d-block)
Write the formula for the following coordination compound:
Iron (III) hexacyanoferrate (II)
Concept: Concept of Coordination Compounds
CO (g) and H2 (g) react to give different products in the presence of different catalysts. Which ability of the catalyst is shown by these reactions?
Concept: Catalysis >> Catalysts in Industry
What happens when a freshly prepared precipitate of Fe(OH)3 is shaken with a small amount of FeCl3 solution?
Concept: Properties of Colloidal Solutions
What happens when persistent dialysis of a colloidal solution is carried out?
Concept: Properties of Colloidal Solutions
What happens when an emulsion is centrifuged?
Concept: Properties of Colloidal Solutions
(A), (B) and (C) are three non-cyclic functional isomers of a carbonyl compound with molecular formula C4H8O. Isomers (A) and (C) give positive Tollens' test whereas isomer (B) does not give Tollens' test but gives positive Iodoform test. Isomers (A) and (B) on reduction with Zn(Hg)/conc. HCl give the same product (D).
1) Write the structures of (A), (B), (C) and (D).
2) Out of (A), (B), and (C) isomers, which one is least reactive towards the addition of HCN?
Concept: Bonding in Metal Carbonyls
Write the structures of the main products in the following reactions :
Concept: Importance and Applications of Coordination Compounds
What type of isomerism is exhibited by the complex [Co(NH3)5Cl]SO4?
Concept: Isomerism in Coordination Compounds >> Structural Isomerism
Write the hybridisation and number of unpaired electrons in the complex `[CoF_6]^(3-)`. (Atomic No. of Co = 27)
Concept: Bonding in Coordination Compounds >> Valence Bond Theory (VBT)
Write the chemical reactions involved in the process of extraction of Gold. Explain the role of dilute NaCN and Zn in this process.
Concept: Types of Separation or Concentration of an Ore >> Leaching
Write the structures of the main products in the following reactions :
Concept: Nomenclature of Haloalkanes and Haloarenes
