Assertion (A): Oxidation involves loss of electrons. Reason(R) :During oxidation number of an element decreases.

(a) Alien species invasion When alien species are introduced unintentionally / deliberately for whatever purpose , some of them turn invasive and cause decline / extinction of indigenous species eg. - the...

(c) Bond angle of H2S (92°) < H2O (104°31). As the electronegativity of the central atom decreases, bond angle decreases. In the present case, S is less electronegative than oxygen....

(a) Both A and R are true and R is the correct explanation of the A.

(b) Both A and R are true and R is not the correct explanation of the A.

(a) Habitat loss and fragmentation : It is one of the most important cause of biodiversity loss. Best example of habitat loss is destruction of tropical rain forest or Amezon...

In a neutral atom, number of electrons are equal to the number of proton. No. of protons = No. of electrons = 29 Mass number = No. of protons + No. of...

We know that, mass number = Number of protons + Number of neutrons  But number of protons is equal to the atomic number.  ∴ Mass number = Atomic number + number of...

(C) same number of neutrons

Position of P Group-2 Because it has 2 valence electrons/ 2, S, 8, 2 Period-4 Because it has 4 shells/2,8,8,2 Position of Q Croup-17 Because it has 7 valence electrons/ 2, 8, 7 Period-3 Because it has 3 shells/...

(i) The position of elements X in the modern periodic table is group number 17 and period number 3. The position of element Y in the modern periodic table is...