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Explain the structure of starch and cellulose.
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Consider the reaction $\text{R}\xrightarrow{\ \ \text{k}\ \ } \text{P}.$ The change in concentration of R with time is shown in the following plot:
→- Predict the order of the reaction.
- Derive the expression for the time required for the completion of the reaction.
- What does the slope of the above line indicate?
Answer the following questions:
Assign reasons for the following:
Assign reasons for the following:
- In the series Sc (Z = 21) to Zn (Z = 30), the enthalpy of atomisation of Zn is the lowest.
- Zr and Hf have almost identical radii.
- Transition metals show variable oxidation states.
- The E°M2+/M value for copper is positive (+0.34 V).
Give the electronic configuration of the following complexes on the basis of Crystal Field Splitting theory.
[CoF6]3-, [Fe(CN)6]4- and [Cu(NH3)6]2+
[CoF6]3-, [Fe(CN)6]4- and [Cu(NH3)6]2+
Answer the following questions:
Draw the structures of chromate and dichromate ions.
Draw the structures of chromate and dichromate ions.
Discuss biological and industrial importance of osmosis.
- Define the following terms:
- Mole fraction.
- Ideal solution.
- 15.0 g of an unknown molecular material is dissolved in 450 g of water. The resulting solution freezes at - 0.34°C. What is the molar mass of the material?
(Kf for water = 1.86 K kg mol–1).
The elements of 3d transition series are given as:
Sc Ti V Cr Mn Fe Co Ni Cu Zn.
Answer the following:
Sc Ti V Cr Mn Fe Co Ni Cu Zn.
Answer the following:
- Write the element which shows maximum number of oxidation states. Give reason.
- Which element has the highest m.p?
- Which element shows only + 3 oxidation state?
- Which element is a strong oxidizing agent in + 3 oxidation state and why?
Explain the methods of preparation alcohol from the following compounds:
(a) From carbonyl compound
(b) From carboxylic acid
(c) From esters
(d) From Grignard reagent
(a) From carbonyl compound
(b) From carboxylic acid
(c) From esters
(d) From Grignard reagent
- 30 g of urea (M = 60 g mol-1) is dissolved in 846 g of water. Calculate the vapour pressure of water for this solution if vapour pressure of pure water at 298 K is 23.8 mm Hg.
- Write two differences between ideal solutions and non-ideal solutions.
The air is a mixture of a number of gases. The major components are oxygen and nitrogen with approximate proportion of 20% is to 79% by volume at 298 K. The water is in equilibrium with air at a pressure of 10 atm. At 298 K if the Henry’s law constants for oxygen and nitrogen at 298 K are 3.30 × 107 mm and 6.51 × 107 mm respectively, calculate the composition of these gases in water.