26.0kj/mol
65.0kj/mol
130.0kj/mol
260.0kj/mol
Correct answer is B
32g of CUSO\(_4\) liberate 13.0kj of heat
Molar mass of CUSO\(_4\) = 160g
No. of moles of CUSO\(_4\) = 32g
No. of moles = 32(mass) / 160(molar mass)
= 0.2 moles
i.e 0.2 = 13kj
1 moles = xkj
: 65KJ
Helium is used in observation of ballons because it is?
Light and combustible
light and non-combustible
heavy and combustible
heavy and non-combustible
Correct answer is B
Helium floats because it is buoyant; its molecules are lighter than the nitrogen and oxygen molecules of our atmosphere and so they rise above it
Chromatography is used to separate components of mixture which differ in their rates of ?
diffusion
migration
reaction
sedimentation
Correct answer is B
Chromatography is a method of separating mixtures by using a moving solvent on filter paper. The rate at which each solute moves up the paper depends on how strongly it is absorbed by the paper, and how soluble it is in the solvent.
less than 3.4
greater than 3.4
unaltered
the same as that of the pure water
Correct answer is A
The addition of conc HCL makes the solution more acidic and the solution falls below the original value
Which of the following gases will rekindle a brightly splint?
NO\(_2\)
NO
N\(_2\)O
CL\(_2\)
Correct answer is C
Nitrogen(I)Oxide rekindles a brightly glowing splinter but extinguishes a feebly glowing one which is not hot enough to decompose the gas to liberate oxygen