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Name the causative organism and preventive measures for Typhoid
Concept: Disease
Mention any four benefits of biogas.
Concept: Microbes in Energy Generation
Mention a product for human welfare obtained with the help of the following microbe:
Propionibacterium shermanii
Concept: Microbes in Human Welfare
Define the following term:
Commensalism
Concept: Population Interactions
What is ferromagnetism?
Concept: Properties of Solids: Magnetic Properties
Distinguish between crystalline solid and amorphous solid.
Concept: Types of Solids
An element crystallizes in a f.c.c. lattice with a cell edge of 250 pm. Calculate the density if 300 g of this element contains 2 × 1024 atoms.
Concept: Calculations Involving Unit Cell Dimensions
An element with molar mass 27 g mol−1 forms a cubic unit cell with edge length 4.05 ✕ 10−8 cm. If its density is 2.7 g cm−3, what is the nature of the cubic unit cell?
Concept: Number of Atoms in a Unit Cell
Define the following term
Schottky defect
Concept: Imperfections in Solids - Introduction
An element with density 2.8 g cm–3 forms a f.c.c. unit cell with edge length 4 x 10–8 cm. Calculate the molar mass of the element.
(Given : NA = 6.022 x 1023 mol –1)
Concept: Calculations Involving Unit Cell Dimensions
Sodium crystallizes in bcc structure. If the edge length of unit cell is 4.3 × 10-8 cm, the radius of Na atom is ______.
Concept: Classification of Crystalline Solids
Sodium crystallizes in bcc structure. If the edge length of unit cell is 4.3 × 10-8 cm, the radius of Na atom is ______.
Concept: Classification of Crystalline Solids
A substance crystallizes in fcc structure. The unit cell edge length is 367.8 pm. Calculate the molar mass of the substance if its density is 21.5 g/cm3.
Concept: Packing Efficiency
Derive the relationship between relative lowering of vapour pressure and molar mass of nonvolatile solute.
Concept: Colligative Properties and Determination of Molar Mass >> Relative Lowering of Vapour Pressure
Calculate the freezing point of solution when 1.9 g of MgCl2 (M = 95 g mol−1) was dissolved in 50 g of water, assuming MgCl2 undergoes complete ionization.
(Kf for water = 1.86 K kg mol−1)
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
What happens when the external pressure applied becomes more than the osmotic pressure of solution?
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure
What happens when the external pressure applied becomes more than the osmotic pressure of solution?
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure
When 2.56 g of sulphur was dissolved in 100 g of CS2, the freezing point lowered by 0.383 K. Calculate the formula of sulphur (Sx).
(Kf for CS2 = 3.83 K kg mol−1, Atomic mass of sulphur = 32 g mol−1]
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we place blood cells in a solution containing
(i) 1.2% sodium chloride solution?
(ii) 0.4% sodium chloride solution?
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure
Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we place blood cells in a solution containing
(i) 1.2% sodium chloride solution?
(ii) 0.4% sodium chloride solution?
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure
