Chemistry
Select the correct statement(s) for the diagram shown below.
P — Mg looses electrons and undergoes reduction.
Q — Cl gains electrons and undergoes reduction.
R — Mg looses electrons and undergoes oxidation.
- Only P
- Only Q
- Only R
- Both Q and R
Answer
Both Q and R
Reason — Magnesium has two valence electrons in its outermost orbit. So, it will donate its electrons and undergo oxidation to obtain octet configuration. Each chlorine has 7 valence electrons in its outermost orbit. So, it will gain one electron each and undergo reduction to obtain octet configuration.
Related Questions
Postulates of modern atomic theory are:
P — Atoms of an elements may not be alike.
Q — Atoms of elements combine in small whole numbers to form molecules.
R — Atoms can neither be created nor destroyed.
- Only P
- Only Q
- Only R
- Both P and Q
An atom is electrically neutral because :
P — Electrons, protons and neutrons are equal in number.
Q — Protons are equal to neutrons.
R — Protons are equal to electrons.
- Only P
- Only Q
- Only R
- Both Q and R
Select the correct statement(s) for the diagram shown below.
P — One atom of carbon transfers one electron to each chlorine atom.
Q — One atom of carbon shares four electron pairs, one with each of the four atoms of chlorine.
R — Carbon atom attains neon configuration and chlorine attains argon configuration after the combination.
- Only P
- Only Q
- Only R
- Both Q and R
Assertion (A): The atomic mass of an element is mainly the mass of its nucleus.
Reason (R): The nucleus of an element contains neutrons and protons and the electrons have a negligible mass.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.