Endothermic Reactions

Q.

The given reaction is an example of _.

Reaction: $\mathrm{C}\left(\mathrm{s}\right)+2\mathrm{S}\left(\mathrm{s}\right)\to \mathrm{\Delta }+{\mathrm{CS}}_2\left(\mathrm{l}\right)$

Q.

The reaction between quick lime and water is endothermic reaction.

1. True
2. False

Q. All reactions which have chemical disintegration :

1. Is exothermic
2. Is reversible
3. Is reversible and endothermic
4. Is reversible or irreversible and endothermic or exothermic

Q.

Write one reaction for each of the following:

Evolution of heat

Q.

Write a short note on exothermic reaction.

Q. Reaction of silicon with coke at a high temperature is a/an ___________ reaction.

1. exothermic
2. endothermic
3. neutral
4. explosive

Q. The heat content of the product is more than that of reactants in an endothermic reaction.
If true enter 1, else enter 0.

Q. The formation of the oxide ion $O^{2-}\left(g\right)$ requires first an exothermic and then an endothermic step as shown below,
$O\left(g\right)+e\to O^{-}\left(g\right);\Delta H=-142kJ/mol$
$O^{-}\left(g\right)+e\to O^{2-}\left(g\right);\Delta H=844kJ/mol$
These is because:

1. Oxygen has high electron affinity
2. $O^{-}$ ion has comparatively larger size than oxygen atom
3. $O^{-}$ ion will lead to resist the addition of another electron
4. Oxygen is more electronegative