When acetylene is passed through a red-hot iron tube,compound $X$ is formed. Which one of the following reactions will yield $X$ as the major product?
- A$C_6H_5OH + Zn \xrightarrow{\text{distillation}} C_6H_6 + ZnO$
- B$C_6H_5SO_3H + NaHCO_3 \longrightarrow C_6H_5SO_3Na + H_2O + CO_2$
- C$C_6H_{12} + 3H_2 \xrightarrow{Ni} C_6H_{12} + 3H_2$ (No reaction)
- D$C_6H_5Cl + H_2O \xrightarrow{\Delta} C_6H_5OH + HCl$
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The system of equations $3x + 2y + z = 6$,$3x + 4y + 3z = 14$ and $6x + 10y + 8z = a$ has an infinite number of solutions if $a$ is equal to
Match the following columns correctly:
Column-$I$ Column-$II$ $A$. Tapetum $i$. Degenerates during development $B$. Intine $ii$. Resistant organic material $C$. Vegetative cell $iii$. Pollen tube $D$. Sporopollenin $iv$. Provides nourishment to pollen grains
| Column-$I$ | Column-$II$ |
| $A$. Tapetum | $i$. Degenerates during development |
| $B$. Intine | $ii$. Resistant organic material |
| $C$. Vegetative cell | $iii$. Pollen tube |
| $D$. Sporopollenin | $iv$. Provides nourishment to pollen grains |
Which of the following logic gates is a universal gate?
$A$ car travels from point $A$ to point $B$ with a speed of $40 \ km/h$ and returns from $B$ to $A$ with a speed of $60 \ km/h$. What is the average speed of the car for the entire journey (in $km/h$)?
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