Match the column and choose correct option:
`{:("(A) Conductance","P. m"^(-1)),("(B) Conductivity","Q. S cm"^(-1)),("(C) Molar conductance","R. Siemen"),("(D) Cell constant","S. S cm"^(2)"mol"^(-1)):}`

Options

A. `A-R, B-Q, C-S, D-P`
B. `A-R, B-S, C-Q, D-P`
C. `A-R, B-Q, C-P, D-S`
D. `A-R, B-P, C-Q, D-S`

Answer

To solve the problem of matching the columns with the correct units, let's analyze each term step by step:

### Step 1: Identify the unit of Conductance
- **Conductance (A)** is defined as the reciprocal of resistance. The unit of conductance is Siemens (S).
- Therefore, **A matches with R (Siemens)**.

### Step 2: Identify the unit of Conductivity
- **Conductivity (B)** is a measure of a material's ability to conduct electric current. The unit of conductivity is Siemens per centimeter (S/cm).
- Therefore, **B matches with Q (S cm⁻¹)**.

### Step 3: Identify the unit of Molar Conductance
- **Molar Conductance (C)** is defined as the conductance of an electrolyte solution divided by its molarity. The unit of molar conductance is Siemens centimeter square per mole (S cm²/mol).
- Therefore, **C matches with S (S cm² mol⁻¹)**.

### Step 4: Identify the unit of Cell Constant
- **Cell Constant (D)** is defined as the ratio of the distance between the electrodes to the area of the electrodes. Its unit is inverse meters (m⁻¹).
- Therefore, **D matches with P (m⁻¹)**.

### Summary of Matches
- A → R (Siemens)
- B → Q (S cm⁻¹)
- C → S (S cm² mol⁻¹)
- D → P (m⁻¹)

### Final Answer
The correct option for the matching is:
- (A) Conductance → R
- (B) Conductivity → Q
- (C) Molar Conductance → S
- (D) Cell Constant → P