**Match the observations in a eudiometry experiment ( combustion):**

**Column I:**
(A) Contraction on cooling
(B) Contraction with
(C) Contraction with Alkaline Pyrogallol
(D)

Question

**Match the observations in a eudiometry experiment ($C_xH_y$ combustion):**

**Column I:**
(A) Contraction on cooling
(B) Contraction with $KOH$
(C) Contraction with Alkaline Pyrogallol
(D) Volume of $O_2$ used

**Column II:**
(P) Volume of $CO_2$ produced
(Q) Volume of $H_2O$ (if considered gas)
(R) Volume of unreacted $O_2$
(S) $V_{HC} imes (x + y/4)$

Prashant Kotian · Accepted Answer

Correct answer: (A) $\RIGHTARROW$ Q
(B) $\RIGHTARROW$ P
(C) $\RIGHTARROW$ R
(D) $\RIGHTARROW$ S. **(A)** Cooling turns water vapor to liquid, causing volume loss (Q).
**(B)** absorbs (P).
**(C)** Alkaline pyrogallol absorbs excess oxygen (R).
**(D)** The volume of oxygen consumed is determined by the stoichiometry (S).

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