Question

Three samples of calcium carbonate are placed in the flasks for an investigation.
In flask E 5g of CaCO3 placed in large lumps.
In flask F 5g of CaCO3 placed in medium size lumps.
In flask G 5g of CaCO3 placed in small lumps.

The same volume, in excess,of dilute HCL is added to each flask. Loss of mass is determined in each flask with the help of electronic balances and graphs are plotted as shown in diagram.

I)the three flasks and their content lose mass due to the formation of?
a)O2. b)H2
c)CO2. d)CO

ii) how does rate of reaction change with time?
a) decreases with time
b) increase with time
c)does not change
d)first increases ,then decreases

iii)in which flask reaction is fastest
a) G b)E
c)F d)all have equal

iv)if we use powdered CaCO3 the reaction will be
a) faster. b) slower
c) moderate. d) equally in both cases


v) after how long reaction stops
a)80seconds
b)100 seconds
c)140 seconds
d)160 seconds
​

Answer 1

Answer:

1---(c)

2---(d

4---(d)

Answer 2

this is your required answer not sure of 3

hope it helps you