Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
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.
The atomic number of chlorine is 17. What is the number of electrons in a chloride ion?
16
17
18
19
Correct answer is C
No explanation has been provided for this answer.