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Assertion: sucrose is called invert suga...

Assertion: sucrose is called invert sugar
Reason : sucrose is initially dextrorotatory but in hydrolysed solution mixture is laevaorotatory i.e rotation of light is changed

A

If both assertion & Reason are ture & the Reason is a correct explanation of the Assertion

B

If both Assertion & Reason ar True but Reason is not a correct explantation of the Assertion

C

If Assertion is True but the Reason is False

D

If both Assertion & Reason are false

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A
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Assertion : sucrose is known as invert sugar Reason : sucrose is a disaccharide

Assertion : Sucrose is a non - reducing sugar. Reason : It has glycosidic linkage.

Assertion : A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of a little hydrochloric acid, it becomes laevaorotatory. Reason : Sucrose on hydrolysis gives unequal amounts of glucose and fructose. As a result of this, change in sign of rotation is observed.

Assertion: Sucrose is a non reducing sugar. Reason : Sucrose is a disaccharide formed by glycosidic linkage between C-1 of alpha -glucose and C-2 of beta -fructose.

Assertion: Hydrolysis of sucrose brings about a change in sign of rotation from dextro to laevo. Reason: Hydrolysis always changes the optical rotation of a compound.

Sucrose (sugar) crystals obtained from sugarcane and beetroot are mixed together. Will it be pure substance or a mixture? Give reasons for the same.

Compound A is the light crystaline solid .IT gives the following tests: i. IT dissolves in dilute sulphuric acid, NO gas is produced ii. A drop of MnO_(4) is added to the above solution .The pink colour disappears iii. Compound A is heated strongly .Gases B and C , with pungent smell , come out A brown D is left behind iv . THe gas mixture (B and C) is passed into a dchromate solution .The solution turn green v. THe green solution from step (iv) gives a white precipitate E with a soluttion of barium nitrate . vi. Residue D from step (iii) is heated on charcoal in a reducing flame it gives a magnetic subsytance .Name the compounds A,B,C, D and E

Assertion: Decrease in the vapour pressure of water by adding 1 mol of sucrose to one kg of water is higher to that produced by adding 1 mol of urea to the same quantity of water at the same temperature . Reason : Molecular mass of sugar is less than that of urea .

Which Statements about Carbohydrates are CORRECT ? I. Inulin is a polymer of sucrose . II. Glucose is a respiratory substrate and is also called fruit sugar . III. Starch forms helical secondary structures in which it can hold I_2 molecules. IV. The variant of starch in animals is glycogen .

Assertion: For the plantes orbiting around the sun, angular speed, linear speed, K.E. changes with time, but angular momentum remains constant. Reason: No torque is acting on the rotating planet. So its angular momentum is constant.

ALLEN-BIOMOLECULES(PROTOPLASM)-Exercise Iv
  1. Assertion : starch can be stained with iodine but cellulose can not b...

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  2. Assertion : cellulose is a homopolymer while chitin is a heteroploymer...

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  3. Assertion : Together with polysaccharides and polypeptides nucleic aci...

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  4. Assertion : primary sturcture of protein is the positonal information ...

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  5. Assertion : Last amino acid of any proteins is known as c terminal ami...

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  6. Assertion: Tertiary structure is absolutely necessary for the many bi...

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  7. Assertion : Metal ions are important for functioning of cells Reason...

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  8. Assertion : saturated fatty acids are non essential fatty acids Reas...

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  9. Assertion: maltose is reducing sugar Reason : In maltose 1-2 glycosi...

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  10. Assertion : Glucose is commonest sugar which provides energy on hydrol...

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  11. Assertion: all monosaccharides are reducing sugar Reason : monosacch...

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  12. Assertion: sucrose is called invert sugar Reason : sucrose is initia...

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  13. Assertion: In the oxidation of monosaccharide first step is always pho...

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  14. Assertion : cholesterol is an important biochemical Reason : cholest...

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  15. Assertion : sucrose is known as invert sugar Reason : sucrose is a di...

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  16. Assertion : Phospholipids form bimolecular layer in aqueous me...

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  17. Assertion : all monosaccharides give benedict's test Reason : all m...

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  18. Assertion : beta- pleated sheet structure of protein shows maximum ext...

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  19. Assertion : Fructose is a reducing sugar. Reason : It has a ketonic...

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  20. Assertion : All enzymes are made up of proteins and all proteins have ...

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