1)Which of these can be used to explain that a volume of a fixed
mass of gas is inversely proportional to pressure at a constant
temp?
a) Collisions btw particles are elastic
b)Forces btw particles are extremely weak
c)The kinetic energy of particles is proportional to the temp of
the gas
d)the vol of the gas particles is very small compared with the
vol occupied by the gas
my ans is d) but ans sheet is b)
2)Elements X and Y are in the same grp of the periodic table.
Wich statement is correct?
a)atoms x and y have similar electronic structure
b)if x has a low proton number, it is less metallic
c)the number of electronic shells in atoms x and y must be the
same
d)atoms x and y have the same physical properties
3)An indigestion tablet was dissovled in 100cm3 of water by each
of the 5 students. 25cm3 of their solns were titrated with hcl
using the same indicator. The results are shown below a) 17.4cm3
b)17.5cm3 c)17.4cm3 d)17.6cm3 e)20.0cm3
Wich of the following statements could explain the result
obtained by student E
a)the titration flask was washed out with tablet soln
b)the student measured to top of meniscus in pipette
c)the pipette was washed out with tablet soln
d)the burette was washed out with the hcl
ans is a) but why?
4)wich of the following is most appropriate for preparing a
sample of rubidium sulphate?
a)adding excess rb oxide to sulphuric acid
b)adding excess rbcl to sulphuric acid
c)adding excess rb(oh) to sulphuric acid
d)titrating rb2co3 soln with sulphuric acid
5)ethanol and ethanoic acid can be differentiated by using
i)caco3 ii) acidified potassium dichromate
iii)mg ribbon iv) copper oxide
my ans is i, ii, ii but ans gave all of the above. So my
qn is how does the last cmpd help to differentiate?
