The gas given off when NH4Cl is heated with an alkali is
H2
CI2
N 2
NH 3
Correct answer is D
No explanation has been provided for this answer.
50cm3
150cm3
200cm3
300cm3
Correct answer is B
According to the equation 2NH3 → N2 + 3H2 2x22400cm 3 of ammonia will produce 3x22400cm 3 of hydrogen if 100cm3 of NH3 is used H2 volume = 100/2x22400 x 3 x22400 = 150cm3
Which of the following decreases when a given mass of gas is compressed to half its initial volume?
Average intermolecular distance
Frequency of collisions
Number of molecules present
Atomic radius of each particle
Correct answer is A
No explanation has been provided for this answer.
If a metal R forms a compound with the formula R(NO3)2 the formula of its tetraoxosulphate (VI) is
R(SO4)2
RSO4
R2SO4
R2(SO4)3
Correct answer is B
No explanation has been provided for this answer.
The conclusion from Rutherford's from radioactive substance alpha-scattering experiment is that
atoms are mostly empty space with a samll
emissions from radioactive substances consist of three main components
there is unclear pull on orbital electrons
electrons are deflected by both magnetic and electric fields
Correct answer is A
No explanation has been provided for this answer.