Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

In photography , sodium thiosulphate is used as :

  • complexing agent

  • oxidising agent

  • reducing agent

  • none of these


A.

complexing agent

In photography sodium thiosulphate (hypo) is used as a complexing agent .It dissolves unreduced silver bromide by forming a complex .

AgBr + 2Na2S2O3hypo   Na3[Ag(S2O3)2]Sodium argent of thiosulphate (soluble) + NaBr


52.

Substance used as antiseptic for curing wounds is :

  • equanil

  • iodine

  • proguanil

  • bithional


B.

iodine

Iodine is used as an antiseptic which is used for curing wounds .


53.

Which of the following is not a broad spectrum antibiotic ?

  • Tetracycline

  • Chloromycetin

  • Penicillin

  • None of these


C.

Penicillin

Penicillin is not a .broad spectrum antibiotic , it discovered by Alexander Flemming .It is effective against pneumonia , bronchitis , sore throat etc .


54.

The IUPAC name of compound is :

CH2=CH-CH(CH3)2

  • 1 - isopropylethylene

  • 2 - vinyl propane

  • 3 - methyl 1 - butene

  • 1 , 1 , dimethyl 1 , 2 - propene


C.

3 - methyl 1 - butene

The IUPAC name of this compound is 3 - methyl 1 - butene .


55.

A compound A ➔ C5H10Cl2 on hydrolysis gives C5H10O which reacts with NH2OH forms iodoform , but does not give Fehling test A is :


A.

A compound (C5H10Cl2) on hydrolysis gives C5H10O , which reacts with hydroxylamine , so C5H10O  must be aldehydic or ketonic group but it does not give Fehling test , so it must be a ketone and it form iodoform which is a charactertistic test of CH3CO group .


56.

Which of the following test is not used for testing of proteins ?

  • Millon's test

  • Molisch's test

  • Biuret test

  • Ninhydrin test


B.

Molisch's test

Molisch's test is used in testing of carbohydrate and is not used in testing of proteins .


57.

Which of the following reactions will not give propane ?

  • CH3CH2CH2Cl H2OMg/ether

  • CH3COCl H2OCH3MgX

  • CH3CH=CH2 CH3COOHB2H6

  • CH3-C(OH)-CH3 P/HI


B.

CH3COCl H2OCH3MgX

Ketones are obtained by the reaction between acid chlorides and Grignard reagent .

CH3COClAcetyl chloride + CH3MgX H2O (CH3)2-C=ODi methyl ketone + MgClX


58.

.


A.

Phenol couples with benzene diazonium chloride in slightly basic medium to form a brillant red coloured azo dye .

p - hydroxy azobenzene (Brillant red dye)


59.

Cobalt - 60 is used in the treatment of :

  • leukaemia

  • thyroid disorders

  • cancer

  • pneumonia


C.

cancer

Cobalt - 60 is used in the treatment of cancer .


60.

Phenol and benzoic acid are distinguished by :

  • NaOH

  • NaHCO3

  • Na2CO3

  • H2SO4


B.

NaHCO3

Phenol and benzoic acid can be distinguished by NaHCO3 because only stronger acid reacts with sodium bicarbonate .