Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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31.

Methanol and ethanol are miscible in water due to

  • covalent character

  • hydrogen bonding character

  • oxygen bonding character

  • None of the above


B.

hydrogen bonding character

Methanol and ethanol are miscible in water due to hydrogen bonding character.


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32.

Which of the following is not reducing sugar?

  • Glucose

  • Fructose

  • Lactose

  • Sucrose


D.

Sucrose

Sucrose is not a reducing sugar because it does not have an OH group attached to the anomeric carbon, so they cannot reduce other compounds.


33.

The enzyme which can catalyse the conversion of glucose to ethanol is

  • zymase

  • invertase

  • maltase

  • diastase


A.

zymase

Zymase is an enzyme which can catalyse the conversion of glucose to ethanol. It catalyzes the fermentation of sugar into ethanol and CO2. It is naturally found in yeasts.


34.

Reaction of ethyl formate with excess of CH3MgI followed by hydrolysis gives

  • n-propyl alcohol

  • isopropyl alcohol

  • acetaldehyde

  • acetone


C.

acetaldehyde

Acetaldehyde is formed when ethyl formate reacts with excess of CH3MgI.


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35.

Styrene can be purified by

  • simple distillation

  • fractional distillation

  • steam distillation

  • vacuum distillation


D.

vacuum distillation

Styrene can be purified using a process called vacuum distillation.


36.

Which of the following does not reduce Fehling's solution?

  • Benzaldehyde

  • Formic acid

  • Glucose

  • Fructose


D.

Fructose

Fructose does not reduce Fehling's solution because it contains ketonic group.


37.

Freon used as refrigerant is

  • CF2=CF2

  • CH2F2

  • CCl2F2

  • CF4


C.

CCl2F2

The chloroflurocarbon compounds of methane and ethane are collectively known as freons. It is CCl2Fand is used as a refrigerant.


38.

Lucas reagent is

  • anhy. ZnCl2 and NH3

  • anhy. ZnCl2 and CaCl2

  • anhy. ZnCl2 and conc. HCl

  • anhy. ZnCl2 and conc. HCl gas


C.

anhy. ZnCl2 and conc. HCl

Lucas reagent is anhydrous ZnCl2 and conc. HCl. It is used to differentiate the primary, secondary and tertiary alcohol.


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39.

The monomer of teflon is

  • CHF = CH2

  • CF2 = CF2

  • CHCl = CHCl

  • CHF = CHCl


B.

CF2 = CF2

Tetrafluoroethene is the monomer of teflon.

nCF2 CF2 Polymerisation (-CF2 - CF2-)n

                                              teflon


40.

Hydrolysis of phenyl isocyanide forms

  • benzoic acid

  • formic acid

  • acetic acid

  • None of these


B.

formic acid

Hydrolysis of phenyl isocyanide forms formic acid.

C6H5NCphenyl isocyanide  +  2H2 HCOOHformic acid   + C6H5NH2aniline


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