0.040dm 3
0.896dm 3
5.82dm 3
8.62dm 3
Correct answer is B
Zn + 2HCI → ZnCI2 + H2; 65g of Zn produces 22.4 dm3 of H2; .: 2.6g of Zn will produce = 2.6/65 x 22.4 = 0.896 dm3
Gas molecules are said to be perfectly elastic because
they collide without loss of energy
they move about in straight lines
the distances between them are negligible
the volume occupied by them is negligible
Correct answer is A
No explanation has been provided for this answer.
Equal volumes of CO2 cnd CO at s.t.p have the same
mass
density
rate of diffusion
number of molecules
Correct answer is D
No explanation has been provided for this answer.
Which of the following movements can be described as random motion?
wheelbarrow being pushed
car travelling on a straight line
Gas molecules colliding in a flask
Planets going round the sun
Correct answer is C
No explanation has been provided for this answer.
Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of
diffusion
combustion
absorption
emission
Correct answer is A
No explanation has been provided for this answer.