s-Block ElementsHard
Question
Consider the following statements,
S1 : KO2 is CO and CO2 abrosber, and O2 emitter.
S2 : CaCl2. 6 H2O is widely used for melting ice on roads, particulary in very cold countries.
S3 : The process of setting of plaster of paris is exothermic.
S4 : MgCl2.6 H2O on strong heating yields anhydrous MgCl2.
and arrange in the order of true/false.
S1 : KO2 is CO and CO2 abrosber, and O2 emitter.
S2 : CaCl2. 6 H2O is widely used for melting ice on roads, particulary in very cold countries.
S3 : The process of setting of plaster of paris is exothermic.
S4 : MgCl2.6 H2O on strong heating yields anhydrous MgCl2.
and arrange in the order of true/false.
Options
A.T T T T
B.F T T T F
C.T T T F
D.T F F T
Solution
S1 : 2 KO2 + CO2 → K2CO3 + 
O2
S2 : Because a 30% mixture of CaCl2 / H2O freezes at - 55oC as compared to NaCl / H2O at - 18oC. As such CaCl2 melts down the ice by decreasing the melting point.
S3 : 2 CaSO4. H2O
CaSO4 . 2 H2O. (Heat is evolved as a result of the formation of another hydrate.)
S4 : MgCl2 . 6 H2O → MgO + 2 HCl + 5 H2O.
O2S2 : Because a 30% mixture of CaCl2 / H2O freezes at - 55oC as compared to NaCl / H2O at - 18oC. As such CaCl2 melts down the ice by decreasing the melting point.
S3 : 2 CaSO4. H2O
CaSO4 . 2 H2O. (Heat is evolved as a result of the formation of another hydrate.)S4 : MgCl2 . 6 H2O → MgO + 2 HCl + 5 H2O.
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