Question
Write a note on esterification of alcohols and phenols.
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Answer the following questions.
What deficiency diseases are caused due to lack of vitamins A, B1, B6 and K in human diet?
What deficiency diseases are caused due to lack of vitamins A, B1, B6 and K in human diet?
Ionisation enthalpies of Ce, Pr and Nd are higher than Th, Pa and U.
Define the following with an example of each:
- Polysaccharides.
- Denatured protein.
- Essential amino acids.
Answer the following questions.
A non-reducing disaccharide ‘A’ on hydrolysis with dilute acid gives an equimolar mixture of D-(+)-glucose and D-(-)-fructose.
$\text{A}+\text{H}_2\text{O}\xrightarrow{\text{HCl}\ \ \ \ }\ \ \ \ \ \ \text{C}_6\text{H}_{12}\text{O}_6+\ \ \ \ \ \ \text{C}_6\text{H}_{12}\text{O}_6\\ [\alpha]_{\text{D}}=+66.5\hat{\text{O}}\phi\Omega\ \ \ \ \ +52.5\hat{\text{O}}\phi\Omega\ \ \ \ \ -92.4\hat{\text{O}}\phi\Omega$
Identify A. What is the mixture of D-(+)-glucose and D-(-)-fructose known as? Name the linkage that holds the two units in the disaccharide.
→A non-reducing disaccharide ‘A’ on hydrolysis with dilute acid gives an equimolar mixture of D-(+)-glucose and D-(-)-fructose.
$\text{A}+\text{H}_2\text{O}\xrightarrow{\text{HCl}\ \ \ \ }\ \ \ \ \ \ \text{C}_6\text{H}_{12}\text{O}_6+\ \ \ \ \ \ \text{C}_6\text{H}_{12}\text{O}_6\\ [\alpha]_{\text{D}}=+66.5\hat{\text{O}}\phi\Omega\ \ \ \ \ +52.5\hat{\text{O}}\phi\Omega\ \ \ \ \ -92.4\hat{\text{O}}\phi\Omega$
Identify A. What is the mixture of D-(+)-glucose and D-(-)-fructose known as? Name the linkage that holds the two units in the disaccharide.
After watching a programee on TV about the adverse effects of junk food and soft drink on the health of school children, Sonali, a student of class XII, discussed the issue with the school principal. Principal immediately instructed the canteen contractor to replace the fast food with the fibre and vitamins rich food like sprouts, salad, fruits etc. This decision was welcomed by the parents and the students.
After reading the above passage, answer the following questions:
After reading the above passage, answer the following questions:
- What values are expressed by Sonali and the principal of the school?
- Give two examples of water-soluble vitamins.
Write note on lead storage cell.
Differentiate between rate of reaction and reaction rate constant.
Although +3 oxidation states is the characteristic oxidation state of lanthanoids but cerium shows +4 oxidation state also. Why?
Vapour pressure of water at 293 K is 17.535 mm Hg. Calculate the vapour pressure of water at 293 K when 25 g of glucose is dissolved in 450 g of water.
Explain chemical properties of $KMnO _4$
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