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Predict whether van’t Hoff factor, (i) is less than one or greater than one in the following:
CH3COOH dissolved in water
Concept: Abnormal Molar Masses
A solution 0.1 M of Na2SO4 is dissolved to the extent of 95%. What would be its osmotic pressure at 027 ? C (R = 0.0821 L atm K-1 mol-1) .
Concept: Colligative Properties and Determination of Molar Mass - Introduction
An element crystallises in bcc lattic with a cell edge of 3 × 10-8cm. The density of the element is 6.89 g cm-3 . calculate the molar mass of element. (NA = 6.022 × 1023 mol-1)
Concept: Packing Efficiency >> Efficiency of Packing in Body-centred Cubic Structures
What type of semiconductor is obtained when
Ge is doped with In?
Concept: Properties of Solids: Electrical Properties >> Conduction of Electricity in Semiconductors
What type of semiconductor is obtained when
Si is doped with P?
Concept: Properties of Solids: Electrical Properties >> Conduction of Electricity in Semiconductors
Out of NaCl and AgCl, which one shows Frenkel defect and why?
Concept: Imperfections in Solids >> Types of Point Defects - Stoichiometric Defects
Arrange the following in increasing order of boiling points:
(CH3)3 N, C2 H5 OH, C2 H5 NH2
Concept: Colligative Properties and Determination of Molar Mass >> Elevation of Boiling Point
State Raoult’s law for a solution containing volatile components. Write two characteristics of the solution which obey Raoult’s law at all concentrations.
Concept: Vapour Pressure of Liquid >> Vapour Pressure of Liquid- Liquid Solutions
Out of [CoF6]3- and [Co(en)3]3+, which one complex is
(i) paramagnetic
(ii) more stable
(iii) inner orbital complex and
(iv) high spin complex
(Atomic no. of Co = 27)
Concept: Properties of Solids: Magnetic Properties
An element crystallizes in fcc lattice with a cell edge of 300 pm. The density of the element is 10.8 g cm-3. calculate the number of atoms in 108 g of the element.
Concept: Calculations Involving Unit Cell Dimensions
A 4% solution(w/w) of sucrose (M = 342 g mol–1) in water has a freezing point of 271.15 K. Calculate the freezing point of 5% glucose (M = 180 g mol–1) in water.
(Given: Freezing point of pure water = 273.15 K)
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
Account for the following :
o-nitrophenol is more steam volatile than p-nitrophenol.
Concept: Classification of Crystalline Solids
Give reason for the following :
Sulphur in vapour state shows paramagnetic behaviour.
Concept: Properties of Solids: Magnetic Properties
Write the name of gas released when Cu is added to dilute HNO3
Concept: Solubility >> Solubility of a Gas in a Liquid
Write the name of gas released when Cu is added to the conc. HNO3
Concept: Solubility >> Solubility of a Gas in a Liquid
Arrange the following in decreasing order of solubility in water:
\[\ce{(CH3)3N,(CH3)2NH,CH3NH2}\]
Concept: Introduction of Solubility
Answer the following question.
What type of stoichiometric defect is shown by ZnS and why?
Concept: Imperfections in Solids >> Types of Point Defects - Stoichiometric Defects
A 4% solution(w/w) of sucrose (M = 342 g mol−1) in water has a freezing point of 271.15 K. Calculate the freezing point of 5% glucose (M = 180 g mol−1) in water.
(Given: Freezing point of pure water = 273.15 K)
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
An element crystallizes in fcc lattice with a cell edge of 300 pm. The density of the element is 10.8 g cm−3. Calculate the number of atoms in 108 g of the element.
Concept: Calculations Involving Unit Cell Dimensions
Which of the following is not a characteristic of a crystalline solid?
Concept: General Characteristics of Solid State
