Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

A buffer solution contains 500 mL of 0.2 M CH3COONa and 500 ml of 0.1 M CH3COOH .1 L of water is added to this buffer , pH before and after dilution will be (pka of CH3COOH = 4.74)

  • 3.74

  • 5.04

  • 5.90

  • 7.70


12.

What is binding energy in B511 nucleus , if mass is 0.08181 amu ?

  • 1.2 x 10-4 erg/nucleus

  • 8.2 x 10-4 erg/nucleus

  • 10.2 x 10-4 erg/nucleus

  • 1.9 x 10-4 erg/nucleus


13.

Among third row elements , the IP value :

  • irregularly changes from left to right across the third row

  • increases from left to right across the third row

  • decrease for Na to Ar

  • remains constant


14.

Hydrofluoric acid shows hydrogen bonding due to :

  • high electron affinity of fluorine

  • high bond dissociation energy of fluorine

  • high electronegativity of fluorine

  • none of the above


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15.

The conjugate base of (CH3)2NH2+ is :

  • (CH3)3N

  • (CH3)2NH

  • (CH3)2N-

  • (CH3)2N+


16.

Metals are good conductor of electricity because they contain :

  • a network structure

  • ionic bonds

  • very few valence electrons

  • free electrons


17.

Which is the strongest acid ?

  • ClCH2COOH

  • CH3COOH

  • Cl2CHCOOH

  • CCl3COOH


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18.

Which of the compound is optically active ?

  • 1 - butanol

  • Ethanol

  • 2 - butanol

  • Isopropyl alcohol


D.

Isopropyl alcohol

A compound could be optically active only when it contains at least one asymmetric carbon atom or chiral centre .


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19.

Crystalline form of silica is called :

  • crystalline silicon

  • quartz

  • rock

  • talc


20.

The elements commonly used for making transistors are :

  • Ga and In

  • C and Si

  • P and As

  • Si and Ge


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