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Identify the chiral molecule in the following pair :
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Explain how vacancies are introduced in an ionic solid when a cation of higher valence is added as an impurity in it.
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Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. Explain with the help of a suitable example.
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Calculate the mass of ascorbic acid (Vitamin C, C6H8O6) to be dissolved in 75 g of acetic acid to lower its melting point by 1.5°C. Kf = 3.9 K kg mol−1.
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A 5% solution (by mass) of cane sugar in water has freezing point of 271 K. Calculate the freezing point of 5% glucose in water if freezing point of pure water is 273.15 K.
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Two elements A and B form compounds having formula AB2 and AB4. When dissolved in 20 g of benzene (C6H6), 1 g of AB2 lowers the freezing point by 2.3 K whereas 1.0 g of AB4 lowers it by 1.3 K. The molar depression constant for benzene is 5.1 K kg mol−1. Calculate the atomic masses of A and B.
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The depression in freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly.
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Calculate the depression in the freezing point of water when 10 g of CH3CH2CHClCOOH is added to 250 g of water. Ka = 1.4 × 10−3, Kf = 1.86 K kg mol−1.
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Suggest two materials other than hydrogen that can be used as fuels in fuel cells.
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How are the colloidal solutions classified on the basis of physical states of the dispersed phase and dispersion medium?
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Why are hydrophobic sols easily coagulated?
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How are colloids classified on the basis of Physical states of components
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How are colloids classified on the basis of the nature of the dispersion medium?
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How are colloids classified on the basis of interaction between the dispersed phase and the dispersion medium?
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Discuss the nature of bonding in metal carbonyls.
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Define the following as related to proteins:
Peptide linkage
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What are the common types of secondary structure of proteins?
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What type of bonding helps in stabilising the α-helix structure of proteins?
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Differentiate between the following:
Fibrous proteins and Globular proteins
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Predict the product of the following reaction:
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