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**Ever wondered why ****nitrogen in the liquefied form is used in medical applications? Or why your grandmother often falls ill?**

Well, these were some of the questions asked by Topper readers to our panel of experts.** This week we feature four questions asked by Class X students, along with the answers!**

** Subject**:

The next multiple of 3 will be only p+3,p+6 etc( multiples of 3 will occur only after a gap pf 3)

So, if p is a multiple of 3 then p+2 and p+4 can't be multiples of 3

Next if p+2 is a multiple of 3 then p+2= 3r(say)

So, the multiple of 3 before p+2 must be (p+2)-3 and the next mutiple after p+2 will be (p+2)+3 ie p-1 and p+5 respectively. So if p+2 is a multiple of 3 then por p+4 can't be multiples of 3.

By a similar logic, we can show that if p+4 is a multiple of 3 then p or p+2 can't be multiples of 3.

This explains the answer.

****

**Subject**:** Chemistry**

**Q**. Give reason why nitrogen in the liquefied form finds utility in medical applications such as preserving biological sample!

**Posted by**:** Gpriya**

**A**. At atmospheric pressure, liquid nitrogen boils at 77 K (âˆ'196 Â°C; âˆ'321 Â°F) and is a cryogenic fluid, thus finding utility in the medical applications like cryopreservation of blood, reproductive cells (sperm and egg), and other biological samples and materials.