The equation for the effect of heat on hydrated sodium carbonate is as shown.
Statements made by four students about the reaction are given.
P Anhydrous sodium carbonate is formed.
Q Steam is formed.
R There is a colour change from blue to white.
S The reaction is reversible.
Which students’ statements are correct?
1 )
P, Q and R only
P, Q and S only
3 )
Q, R and S only
4 )
P, Q, R and S
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