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).
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.
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.
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.
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.
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.
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.
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.
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.
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)