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Draw the structures of the HClO3.
Concept: P - Block Group 17 Elements >> Oxoacids of Halogens
Write the chemical equations to illustrate the following name reaction:
Cannizzaro’s reaction
Concept: Aldehydes and Ketones >> Chemical Reactions of Aldehydes and Ketones - Other Reactions
Give reasons for the following:
Aniline does not undergo Friedel- Crafts reaction.
Concept: Amines >> Chemical Reactions of Amines - Electrophilic Substitution
Why is bithional added to soap?
Concept: Cleansing Agents - Soaps
State the two Kirchhoff’s rules used in electric networks. How are there rules justified?
Concept: Kirchhoff’s Laws
In a single slit diffraction experiment, the width of the slit is made double the original width. How does this affect the size and intensity of the central diffraction band?
Concept: Diffraction of Light >> The Single Slit
Give the truth table and circuit symbol for NAND gate
Concept: Digital Electronics and Logic Gates
Calculate the freezing point of a solution containing 60 g of glucose (Molar mass = 180 g mol–1) in 250 g of water. (Kf of water = 1.86 K kg mol–1)
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
Give reasons for the following:
Measurement of osmotic pressure method is preferred for the determination of molar masses of macromolecules such as proteins and polymers.
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
Give reasons for the following :
Aquatic animals are more comfortable in the cold water than in warm water.
Concept: Solubility >> Solubility of a Gas in a Liquid
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
For the reaction
`2AgCl (s) + H_2 (g) ("1 atm") -> 2Ag (s) + 2H^(+) (0.1 M) + 2Cl^(-) (0.1 M)`
`triangleG^0 = -43600 J at 25^@ C`
Calculate the e.m.f. of the cell
`[log 10^(-n) = -n]`
Concept: Relation Between Gibbs Energy Change and Emf of a Cell
An analysis shows that FeO has a non-stoichiometric composition with formula Fe0.95O. Give reason.
Concept: General Properties of the Transition Elements (D-block)
Complete and balance the following chemical equations
`Fe^(2+) + MnO_4^(-) + H^+ ->`
Concept: General Properties of the Transition Elements (D-block)
Complete and balance the following chemical equations
`MnO_4^(-) + H_2O + I^(-) ->`
Concept: General 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: General Properties of the Transition Elements (D-block)
Give reasons Iron has the higher enthalpy of atomization than that of copper.
Concept: General Properties of the Transition Elements (D-block)
Give reasons: Sc3+ is colourless in aqueous solution whereas Ti3+ is coloured.
Concept: General Properties of the Transition Elements (D-block)
