NEET Questions Solved


Thrust imparted to the rocket is governed by the:

(a) third law of thermodynamics

(b) gravitational law

(c) newton’s third law

(d) none of the above

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(c) It is based on Newton's third law.

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Which of the following is used in rocket propellants?

(a) H2(l)

(b) O2(l)

(c) N2H4(l)

(d) All of these

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(d) All are fuels.

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A combination of nitrocellulose and nitroglycerine is a propellant of the type:

(a) hybrid propellant

(b) mono propellant

(c) double base propellant

(d) biliquid propellant

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(c) Biliquid propellant A double base propellant is a high strength, high modulus gel of cellulose nitrate (gun cotton) in glyceryl trinitrate or a similar solvent.

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The poisonous gas evolved in Bhopal tragedy from the pesticide plant of Union Carbide Co. was:

(a) CO                    (b) methyl isocyanate

(c) phosgene          (d) chloropicrin

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(b)

It was MIC or methyl isocyanate.

 

Synonyms include isocyanomethane, isocyanatomethane, methylcarbylamine, and MIC.

  • Persons exposed only to methyl isocyanate gas pose no risk of secondary contamination. Persons whose skin or clothing is contaminated with liquid methyl isocyanate can secondarily contaminate rescuers by direct contact or through offgassing of vapor.
  • At temperatures below 39ºC (102ºF), methyl isocyanate is a very flammable colorless liquid that readily evaporates when exposed to air. Gaseous methyl isocyanate is slightly heavier than air.
  • Although methyl isocyanate has a pungent odor, adverse health effects have been reported at or below the human odor threshold; therefore, odor detection is not a reliable indicator of exposure.
  • Methyl isocyanate is readily absorbed through the upper respiratory tract. Methyl isocyanate can also be absorbed through the digestive tract or skin.

Image result for methyl isocyanate formula

 

 

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Oil of winter green and salol are the esters of:

(a) salicylic acid

(b) lactic acid

(c) acetic acid

(d) sulphanilic acid

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(a) Phenyl salicylate is salon; methyl salicylate,etc.

 

Methyl salicylate (oil of wintergreen or wintergreen oil) is an organic compound with the formula C6H4(OH)(CO2CH3). It is the methyl ester of salicylic acid. It is a colorless, viscous liquid with a sweet odor. It is produced by many species of plants, particularly wintergreens. It is also synthetically produced, used as a fragrance, in foods and beverages, and in liniments.

Skeletal formula

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Which of the following is an example of basic dye ?
(a) Alizarin
(b) Malachite green
(c) Indigo
(d) Orange I

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(b)

Basic dyes contain NH2 or -NR2 group as colour bearing groups or colour enhancing groups. They are generally used for wool, cotton, leather, paper, polyester, nylon, etc., e.g. aniline yellow, chrysoidine G, Butter yellow, malachite green, etc.

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Which of the following is not a chromophore?

(a) —N=N—

(b) —NO

(c) —NO2

(d) —NH2

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(d) A dye molecule is made up of two different parts (i) Chromophore (Greek : chroma = colour, phoros = bearing) and (ii) Auxochromes (Greek : auxo = increase, chroma = colour). The groups which produce colour in a compound, i.e., chromophores are usual unsaturated groups like nitro.nitroso, azo, azoxy, carbonyl and olefinic bonds. Auxochromes are usually acidic / basic functional groups like —OH, —COOH, —SO3H, —NH2, - -NHR1 —:NR2.

A compound containing only a chromophore may be a coloured material but not a dye, e.g., azobenzene is red coloured but not a dye whereas p-aminoazobenzene (aniline yellow) is a dye.

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Which of the following groups is not an auxochrome ?
(a)-N(CH3)2
(b)-OH
(c)-OCH3
(d) >C=N

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(d)

A dye molecule is made up of two different parts (i) Chromophore (Greek : chroma-colour, phoros -bearing) and (ii) Auxochromes (Greek : aux。= increase, chroma colour). The groups which produce colour in a compound, i.e. chromophores are usual unsaturated groups like nitro,nitroso, azo, azoxy, carbonyl and olefinic bonds. Auxochromes are usually acidic /basic functional groups like -OH, -COOH, -SO3H, -NH2, -NHR, -NR2.

A compound containing only a chromophore may be a coloured material but not a dye, e.g., azobenzene is red coloured but not a dye whereas p-aminoazobenzene (aniline yellow) is a dye.

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Alizarin a mordant dye is not used in:

(a) cotton dyeing

(b) printing

(c) painting

(d) Chromium lakes for wood dyeing 

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(b)

It is well known that cotton fibres can be dyed through the formation of coordinate bonds involving cellulose chains, mordants such as alum, and natural dyes such asalizarin. Similarly, synthetic dyes known as mordant acid dyes can be used to dye wool fibres.

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A certain dye was prepared from a plant grown on a large scale in India. Name the dye:

(a) Malachite green

(b) Congo red

(c) Indigo

(d) Turmeric

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(c) Indigo is obtained in India by plants.

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