(c) amphoteric oxide (d) basic oxide 9. Which of the following compounds is not a double salt? (a) Zn (OH) NO3 (b) KAI (S04)2 (c) KСr (S04)2 (d)
(NH4) Fe (S04)2
. Which of the following decreases in mass on exposure to air? (a) NaOH (b) Fe (c) FeCl3 (d) Na2C03.10H20
The laboratory apparatus used in keeping salts is​

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.

what is the question here. i think you messed up.