Question

What result would she expect?

• A. In case $P:$ blue to red, in case $Q:$ red to blue
• B. In both cases $P$ and $Q:$ blue to red
• C. In case $P:$ red to blue, in case $Q:$ blue to red
• D. In both cases $P$ and $Q:$ red to blue

Answer 1

Answer: (A)

In case $P:$ blue to red, in case $Q:$ red to blue

$S{O}_2+H_{2}O\to H_{2}S{O}_3$ (acid)

$2H_{2}O+2Na\to 2NaOH+H_2$ (base)

So in case $P:$ blue to red, in case $Q:$ red to blue.