Question # 1

DNA has deoxyribose, a base and the third component is

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Phosphoric acid

Ribose

Adenine

Thymine

Which of the following is not a fatty acid

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Propanoic acid

Acetic acid

Phthalic acid

Butanoic acid

The structure of benzene is

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Hexagonal

Pyramidal

Square planer

Tetrahedral

Both E₁and E₂mechanism can be shown by

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1° - RX

2° - RX

3° - RX

None of these

Which of the following reagent cannot be used for preparing alkyl chloride from alcohol?

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HCl + anhyd. Zncl₂

NaCl

PCl₅

SOCl₂

The function of salt bridge is :

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To increase movement onions.

To increase the emf of cell.

To decrease the temperate

To maintain electrical neutrality

Which of all following compound is not possible

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At room temperature, the mole fraction of a solution in 0.25 and the vapour pressure of the solvent is 0.80 atm. Then the lowering of vapour pressure is

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0.75

0.512

0.80

0.0512

Variable valency is characteristic of

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Halogen

Transition elements

Alkali metals

Noble gas

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154 pm

133 pm

120 pm

150 pm

Quantity of heat evolved or absorbed during the reaction is measured according to the equation

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On passing ethane into concentrated suphuric acid the intermediate compound formed on hydrolysis with boiling water gives

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Methyl alcohol

Ethyl alcohol

Ethyl hydrogen sulphate

Methyl hydrogen sulphate

Ethanol can be converted into ethanoic acid by

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Hydrogenation

Hydration

Oxidation

Fermentation

The quantum number which describe the orientation of the orbitals is

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Spin quantum number

Principle quantum number

Azimathal quantum number

Magnetic quantum number

Oxidation of 2-propanol gives

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Propanone

Butanone

Pentanone

None of these

Which one of the following has been hydroxyl and carboxylic acid groups

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Phenols

Picric acid

Phthalic acid

Salicylic acid

Acid rain is due to increase in atmospheric concentration of

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Ozone and dust

CO₂and CO

SO₃and CO

SO₂and NO₂

d-block elements are also called :

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alkali metal

Alkaline earth metals

Transition elements

Electron deficient elements

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A primary alcohol

A secondary alcohol

An eher

A phenol

The alkaline earth elements have in their s-orbital

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One electron

Two electron

No electron

Three electron

Heaviest particle is

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Meson

Neutron

Proton

Electron

Photons of yellow colour are ______ energetic than violet colour

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More

Less

Equal

None

N₂3H₂⇌ 2NH₃

_{Which of the following change will favorthe formation of more}NH₃at equilibrium in above reaction :

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By adding NH_3.

By removingH_2.

By decreasing pressure.

By increasing pressure.

Isotopes of an element differ in

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Number of protons

Number of electrons

Number of neutrons

Number of electrons and protons

When a metal is dipped in 1 molar of its solution at 298 K. then potential set up is called

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Standard electrode potential

Electric charge

Ionization potential

Electroplating

Formula of chloroform is:

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CH₃Cl

CCl₄

CH₂Cl₂

CHCl₃

The carbon, carbon bond length in benzene is

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1.54A°

1.34A°

1.20A°

1.39A°

At room temperature formaldehyde is

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Gas

Liquid

Solid

None of the above

______ gives peroxide

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Li

Ba

Sr

Be

Which of the following statements is incorrect about vitamins

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Often function as coenzymes

Molecules contain at least one ring structure

Are often synthesized by the body

Are polyfunctional compounds

The oxidation state of an element is zero when

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It forms an oxide

It forms hydride

It is in free state

Only for noble gases

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