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NEET Chemistry Solved Question Paper 2003

Multiple Choice Questions

41.

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

Styrene
2-methyl-1, 3-butadiene
Ethylene
Iso-butene

2-methyl-1, 3-butadiene

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

42.

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

Increase on dilution

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

43.
The transition metals mostly are

paramagnetic

diamagnetic

both 'a' and 'b'

neither diamagnetic nor paramagnetic

paramagnetic

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

44.

Hexamethylenetetramine is used as

urinary antiseptic
antipyretic
analgesic
all of these

urinary antiseptic

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

45.

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

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.

46.

Enzymes are

fatty acids
oils
minerals
proteins

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.