In a neuron the concentration of intracellular potassium and extracellular sodium is in a ratio of
Options
(a) 1:1 (b) 30:1 (c) 10:1 (d) 3:1
Correct Answer:
1:1
Explanation:
The amount of total […]
The organelle of plant cell that does not contain functional DNA is
Options
(a) peroxisome (b) nucleus (c) mitochondrian (d) chloroplast
Correct Answer:
peroxisome
Explanation:
No explanation available. Be the first to write […]
How many pyrrole rings are there in porphyrin?
Options
(a) one (b) two (c) three (d) four
Correct Answer:
four
Explanation:
Four pyrrole rings are there in porphyrin. Chlorophyll structure was studied by Wilstatler, […]
Chitin is a polysaccharide found in the exoskeleton of
Options
(a) prawn (b) insects (c) crabs (d) prawn,insects,crabs, all of these
Correct Answer:
prawn,insects,crabs, all of these
Explanation:
No explanation available. Be the first […]
For a spontaneous process, entropy always
Options
(a) increases (b) decreases (c) keeps changing (d) remains unchanged
Correct Answer:
increases
Explanation:
The force which is responsible for the spontaneity of a process depends upon […]
At 298 K the enthalpy of formation of liquid water is -285.9 kJ/mol and that of steam -242.8 kJ/mol. The enthalpy of vapourisation of water is
Options
(a) 43.1 kJ/mol (b) -43.1 kJ/mol (c) […]
An open system
Options
(a) can neither lose nor gain energy (b) can lose or gain energy (c) can gain or lose matter (d) can lose or gain both matter or energy
Correct Answer: […]
The heat of neutralization is the highest in the following case
Options
(a) a strong acid and a weak base (b) a weak acid and a strong base (c) a strong acid and a […]
Enantiomers
Options
(a) are not mirror images (b) are non-superimposable mirror images (c) are superimposable mirror images (d) constitute a mixture of compounds which are mirror images
Correct Answer:
are non-superimposable mirror images
Which of the following can act as an oxidising as well as reducing agent
Options
(a) Chlorine (b) Air (c) Ozone (d) SO₂
Correct Answer:
SO₂
Explanation:
No explanation available. Be the first […]
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