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Match the variable in Group-$1$ with the instruments in Group-$2$.

$\begin{array}{cc}\
&\text{Group-$1$} & \text{Group-$2$} \\ 
&\text{P. Temperature} & \text{ I. Capacitance probe} \\ 
&\text{Q. Liquid level} & \text{II. McLeod gauge} \\ 
&\text{R. Vacuum} & \text{III. Chromatograph }  \\ 
&\text{S. Concentration} & \text{IV. Thermistor} \\  \end{array}$

Choose the correct set of combinations.

  1. $P-IV,\:Q-III,\:R-II,\:S-I$
  2. $P-I,\:Q-II,\:R-IV,\:S-III$
  3. $P-IV,\:Q-I,\:R-II,\:S-III$
  4. $P-III,\:Q-II,\:R-I,\:S-IV$
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