Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

41.

What is the effect of dilution on the equivalent conductance of strong electrolyte?

  • Decrease on dilution

  • Remains unchanged

  • Increase on dilution

  • None of the above


C.

Increase on dilution

The equivalent conductance of strong electrolyte is increased by dilution, because its value is equal to the multiple of Kv and the volume of solution. By making dilution the volume of solution increases which also increase the value of equivalent conductivity.


42.

Which of following is the correct order of increasing reactivity?

  • RCOOR' < RCOCl < RCONH2

  • RCOOR' < RCONH2 < RCOCl

  • RCOCl < RCONH2 < RCOOR'

  • RCONH2 < RCOOR' < RCOCl


D.

RCONH2 < RCOOR' < RCOCl

Among all the given options, option c has the correct order of increasing reactivity.

RCOCl (Acid halide) < RCONH2 (Amide) < RCOOR (Ester)


43.

The transition metals mostly are

  • paramagnetic

  • diamagnetic

  • both 'a' and 'b'

  • neither diamagnetic nor paramagnetic


A.

paramagnetic

Most of the transition metals show paramagnetic behaviour. The unpaired electrons in (n - 1)d orbitals are responsible for the magnetic properties.


44.

Which one of the following molecules undergoes polymerisation to form natural rubber?

  • Styrene

  • 2-methyl-1, 3-butadiene

  • Ethylene

  • Iso-butene


B.

2-methyl-1, 3-butadiene

Natural rubber is poly-cis-ispropene. It is polymer of 2-methyl-1, 3-butadiene (isoperene).


45.

Hexamethylenetetramine is used as

  • urinary antiseptic

  • antipyretic

  • analgesic

  • all of these


A.

urinary antiseptic

Hexamethylenetetramine is used for the treatment of urinary tract infections. It decomposes at an acidic pH to form formaldehyde and ammonia.


46.

What is the name of reaction when benzaldehyde changes in to benzyl alcohol?

  • Cannizzaro's reaction

  • Wurtz reaction

  • Kolbe reaction

  • Friedel-Craft's reaction


A.

Cannizzaro's reaction

Cannizzaro's reaction is the reaction where benzaldehyde changes in to benzyl alcohol.


47.

Enzymes are

  • fatty acids

  • oils

  • minerals

  • proteins


D.

proteins

Enzymes are biological molecules (specifically proteins) that accelerate chemical reactions. They are vital for life and serve a wide range of important functions in the body, such as aiding in digestion and metabolism.


48.

Cadmium rods are used for which purpose?

  • emit electrons

  • absorb neutrons

  • emit neutrons

  • absorb electrons


B.

absorb neutrons

Cadmium rods are used to absorb neutrons in nuclear reactors, because cadmium is neutron absorber.


49.

Vinegar contains

  • 100% acetic acid

  • 10- 20% acetic acid

  • 7 - 8% acetic acid

  • 1% acetic acid


C.

7 - 8% acetic acid

Vinegar is an aqueous solution of acetic acid and trace chemicals that may include flavorings. It consists of 7 to 8% acetic acid.


50.

An asymmetric carbon atom is which

  • attached three atoms or groups are different

  • attached all the atoms or groups are different

  • attached two atoms or groups are different

  • attached all the atoms or groups are the same


B.

attached all the atoms or groups are different

An asymmetric carbon atom is defined as a carbon within an organic compound that contains four different atoms or groups of atoms (substituents) bonded to it.