Hydrochloric acid. Fluorine, bromine, iodine
Answers are for parents and teachers.
1
How many mol of CO₂ form when HCl acts on 500 g CaCO₃? (M(CaCO₃) = 100 g/mol)
5 mol
2
73 g of HCl is dissolved in 365 g of solution. What is the mass fraction in per cent?
20 %
3
Mass of AgCl from 2 mol NaCl with AgNO₃ (M = 143.5 g/mol)?
287 g
4
Name the oxidizing and reducing agents in Br₂ + 2KI → 2KBr + I₂.
Br₂ — oxidizing agent, I⁻ — reducing agent.
5
Why is it dangerous to mix chlorine bleach with acidic cleaners?
Poisonous chlorine gas is released; never mix cleaning products at home.