Iron II Oxide

Q.

Give the commercial name and chemical formula of the salt which can stop bleeding from a fresh cut.

Q. What is false about Mohr salt

1. It decoloures $KMn{O}_4$
2. It’s a primary standard
3. double salt
4. Oxidation state of iron is +3 in salt

Q. Iron is rendered passive by treatment with concentrated

1. $H_{2}S{O}_4$
2. $H_{3}P{O}_4$
3. HCl
4. $HN{O}_3$

Q. Blood red coloured solution is produced when ferric chloride solution is treated with:

1. $KSCN$
2. $KOH$
3. $K_4\left[Fe\right(CN{)}_6]$
4. $K_3\left[Fe\right(CN{)}_6]$