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.
i and ii only
ii and iv only
iii and iv
i, ii, iii and iv
Correct answer is B
The method of collecting a gas produced by a chemical reaction will depend on its solubility and its density.
The number of electrons in the 3d orbital of \(_24\)Cr is
2
3
4
5
Correct answer is D
Its electronic configuration in ground state is 1s2 2s2 2p6 3s2 3p6 4s1 3d5.
The atoms of \(^{64}_{29}\)Cu and \(^{65}_{30}\)Zn have the same number of?
nucleon
electrons
neutrons
protons
Correct answer is C
The atomic mass is written as superscript = proton number + neutron number
- Atomic mass of Cu is 64 = 29 + 35
- Atomic mass of Zn is 65 = 30 + 35
Proton number is written as subscript
One of the deductions from Rutherford's alpha particle scattering experiment is that?
electrons are negatively charged
electrons have a negligible mass
nuclei of atoms are positively charged
protons are positively charged
Correct answer is C
The model of an atom put forward by Ernest Rutherford in 1911 on the basis of experiments on the scattering of alpha particles. The model consisted of a very dense positively charged nucleus, with electrons orbiting round the nucleus.
Which of the following apparatus is NOT used in volumetric analysis?
Pipette
Burette
Desiccator
conical flask
Correct answer is C
- The most common apparatus used in volumetric determinations are the pipette,buret, measuring cylinder, volumetric and conical (titration) flask.
- A common use for desiccators is to protect chemicals which are hygroscopic or which react with water from humidity.