Question

Match the column:
$\begin{array}{cccc}& \text{Column 1}& & \text{Column 2}\\ & \text{Shape of meniscus}& & \text{Angle of contact}\\ \text{(A)}& \text{Concave}& \text{(i)}& \theta <{90}^{\circ }\\ \text{(B)}& \text{Convex}& \text{(ii)}& \theta =0^{\circ }\\ \text{(C)}& \text{Flat}& \text{(iii)}& \theta >{90}^{\circ }\end{array}$

• A. $\left(A\right)\to \left(i\right);\left(B\right)\to \left(iii\right);\left(C\right)\to \left(ii\right)$
• B. $\left(A\right)\to \left(iii\right);\left(B\right)\to \left(i\right);\left(C\right)\to \left(ii\right)$
• C. $\left(A\right)\to \left(i\right);\left(B\right)\to \left(ii\right);\left(C\right)\to \left(iii\right)$
• D. None of these

Answer 1

The correct option is A $\left(A\right)\to \left(i\right);\left(B\right)\to \left(iii\right);\left(C\right)\to \left(ii\right)$

For a concave meniscus,
Angle of contact, $\theta <{90}^{\circ }$
For a convex meniscus
Angle of contact, $\theta >{90}^{\circ }$
For a flat meniscus (corresponding to a perfectly wetting characteristics of liquid)
$\Rightarrow$ Angle of contact, $\theta =0^{\circ }$