e)
2
Correct Answer:
c) 6
Explanation:
In Rock salt the coordination number of Na+ is six. Because each Na+ is surrounded by six Cl- ions
and each Cl- is surrounded by six Na+ ions.
Question 4
Choose the property, which depends only on, the amount of solute in a solution.
a)
Osmotic pressure
b)
Temperature
c)
Heat capacity
d)
Melting point
e)
None of the above
Correct Answer:
a) Osmotic pressure
Explanation:
Properties that depend only on the amount of the solute not on their identity are known as
colligative properties. In the above four, osmotic pressure alone depends on the amount of the
solute and the rest of properties are independent of amount of solute.
Question 5
Choose the strongest acid from the following.
a)
HClO
4
b)
HClO
3
c)
HClO
2
d)
HOCl
e)
None of the above
Correct Answer:
a) HClO
4
Explanation:
HClO4 is the strongest acid than the rest of the acids. The acidity is due to the presence of the more
electronegative oxygen. The acid with ore oxygen is the strongest acid and it has the highest
electronegativity. It can easily pull the electrons from the central atom and induces the central atom
to draw the electrons from the hydrogenated oxygen. This weakens the O-H bond and H+ ion leaves
the molecule easily.
Question 6
Which of the following represents a spontaneous reaction if T = +10 k?
