Question

1. The number of water molecules present in hydrated Cuso4, is/are
a. 1
b.2
d. 5
2. The metal used for connection of railway tracks after a particular distance
b. Al
c. 3
a. Zn
c.K
d. Fe
3. A thermodynamic state function is a quantity
a. used to determine heat changes
b. whose value is independent of path
c. used to determine pressure volume work d. whose value depends on temperature only
4. The enthalpies of all elements in their standard state are
a. unity
b. zero
d. different for each element​

Answer 1

Answer:

1. 5 is the number of water molecules present in hydrated CUSO4.

Answer 2

Answer:
- The number of water molecules present in hydrated CuSO4 are 5.
- The metal used for the connection of railway tracks after a particular distance is Al.
- A thermodynamic state function is a quantity - whose value is independent of path.
- The enthalpies of all elements in their standard state are - zero.

Explanation:
- CuSO4 is an inorganic compound that hydrates to form CuSO4.5H2O

CuSO4 + H2O → CuSO4.5H2O
Thus, the number of water molecules present is 5.


2.The metal used for connection of railway tracks after a particular distance is Aluminium.
- Al powder reacts as a reducing agent in a reaction known as the Thermite reaction,
- Thermite reaction yields a large amount of heat- exothermic reaction.
- This property of Al is used in thermite welding of railway tracks.
- The reaction is as follows,

Fe2O3 + 2Al → 2Fe +Al2O3 + Heat


3. A thermodynamic state function is a quantity whose value depends only on the initial and final state of the system, irrespective of the path taken to reach the final state.


4. The enthalpies of all elements in their standard state are zero because in the standard state all elements are present in the natural state thus, it no energy is required to form naturally occurring compound.