MCQ
What is the characteristic of a material which undergo spontaneous combustion?
- AHigh calorific value
- BHigh vapour pressure
- CLow ignition temperature
- DAll of the above
Low ignition temperature
Explanation:
pontaneous combustion is a byproduct of spontaneous heating, which occurs when a material increases in temperature without drawing heat from its surroundings. Such materials have a low ignition temperature. If the material reaches its ignition temperature, spontaneous ignition or combustion occurs.
Examples of materials that are prone to spontaneous combustion include oily rags, hay, and other agricultural products.
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$[HCl=36.5; {(N{H_4})_2}S{O_4}=132; N{H_3}=17]$

The correct relation between the bond lengths $a$ and $b$ is