Question

33, Addition of an acid to one of the following substances will lead to the formation of a gas. Which one? a) Caco, b) Car(OH) ) NaS0 ) Ba0 e)none of these 34, What is the shorthand notation for the electronic configuration of vanadi um a) [Arj4s'3db) [ArJ4s 3d (Arj3d' d) (Caj4s'3d e) none of these 35·The relationship between ΔE. AH, p and V is: e) none of these 36. Compounds of three of the following elements are very poisonous. Which three? i) Na ii) Cl iii) Hig iv) C v) Pb vi) As d) ii, iv, vi e) none of these a) i, ii, iii b) iii, iv, c) iii, v, vi 3Z. Which of the following are 'trace elements ? iv) Co İİ) As iii) Cr v)Zn vi) Pb i)Hg vii) Cd c) iii, v, vii b) in, iv, v d) ii, iv, vi aji,ii, ii. e) none of these 38. Two of the following gases cause air pollution. Which two? i) H2 ii) O i) N2 iv) NO2 v) SO α) i and iib) in and iv cjiv and v d) in and v e) none of these 39 Which orbitals overlap to form bonds in the Cl2 molecule: a)s b) sp)p d)d e) none of these 40. What is the shape of the NOj ion a)linear b)trigonal planar C) trigonal pyramidal d) T-shaped e) none of these

Answer 1

33. a) CaCO₃

metal carbonate compounds on reaction with acid release CO₂ as gas along with other product.

34. a) [Ar] 3d³ 4s²

An atomic number of the Vanadium is 23. So, it will give the above-mentioned electronic configuration.

35. c) iii, v, vi

Hg, Pb, As all these three metals are very much toxic in nature as well as harmful if goes in the living organism.

36. c) $\Delta$E = $\Delta$H - $\Delta$PV

37. b) iii, iv, v

Essential trace elements of the human body include zinc (Zn), copper (Cu), selenium (Se), chromium (Cr), cobalt (Co), iodine (I), manganese (Mn), and molybdenum (Mo).

38. c) iv and v

NO₂ and SO₃ are the two-pollutant gases in the air which are having a very harmful effect in environment.