Question

Oxy hydrogen torch is used for welding purpose and for melting platinum and quartz.
If this is true enter 1, if false then enter 0

Answer 1

First we know oxy-hydrogen torch is a torch in which hydrogen gas acts as a fuel and the oxygen gas works as an oxidizer. The temperature of this torch reaches a maximum of $2800^oC$.

Complete step by step answer:
Let’s start with discussing the oxy-hydrogen torch, oxy-hydrogen torch is a torch in which hydrogen gas acts as a fuel and the oxygen gas works as an oxidizer. The temperature of this torch reaches a maximum of $2800^oC$. This temperature is $700^oC$ higher than that of hydrogen flame. So we can see the temperature it achieves is really high.
Now let’s see what the melting point of platinum and quartz is. The melting point of platinum is really high, but it is less than the highest temperature achieved by the oxy-hydrogen torch, the melting point is $1768^oC$. So it is clear that it can be used for melting the platinum. Now, the melting point of the quartz varies with its structure, the melting point ranges from $1670^oC$ for $\beta$ tridymite and $1713^oC$ for $\beta$ cristobalite. So, the oxy-hydrogen torch can melt the torch as well.
Since the temperature achieved by the oxy-hydrogen torch is so high it can easily be used for welding metals.
Hence the statement Oxy hydrogen torch is used for welding purpose and for melting platinum and quartz is true. And we will enter 1.

Note:
We can use widely oxy-hydrogen torches in many industries. The ideal ratio of hydrogen and oxygen is 2:1 ratio with hydrogen being 2 and oxygen being 1. But in practice the ratio is 4:1 or 5:1 just to avoid the oxidizing flame. It is also used for cutting and welding thermoplastics, glasses and metals as well.