SS3 JAMB PRACTISE

The two types of bonds that exist in NH₄⁺ are

• covalent and ionic

• dative and covalent

• dative and ionic

• hydrogen bond and electrovalent

Mg + 2HCl → MgCl₂ + H₂. In the equation above, 8g of magnesium reacts with excess acid. What volume in dm³ of hydrogen is evolved? (Mg = 24, H = 1, Cl = 35.5, volume of gas at s.t.p = 22.4dm³)

• 3.74

• 7.47

• 10.47

• 67.20

0.9g of calcium trioxocarbonate (IV) was added to excess dilute hydrochloric acid. The entire reaction took 3 mins. What is the rate of reaction in gmin^-1?

• 3.9

• 3.3

• 2.7

• 0.3

The oxidation number of P in H₃PO₄ is

• +3

• +4

• +5

• +6

An element with the electronic configuration 1s²2s²2p⁶3s²3p² belongs to group

• II

• III

• IV

• VI

44g of CO₂ contains 6.02 x 10²³ molecules. Calculate the number of molecules in 5.6dm³ of the gas at s.t.p.{1 mole of a gas occupies 22. 4dm³at s.t.p}

• 0.102 x 10²³

• 1.016 x10²³

• 1.506 x 10²³

• 2.409 x 10²⁴

Which of the following expression represents Charles’ law?

• K = P/V

• PV = K

• PV = nRT

• V = KT

Which of the following is a basic salt?

• Ba(NO₃)₂

• Ca(HCO₃)₂

• Na₂SO₃

• Zn(OH)Cl

What mass in grams of magnesium oxide is deposited when 4.2g of magnesium trioxocarbonate (IV) is heated strongly? [ Mg = 24, C= 12, O = 16]

• 0.2

• 0.4

• 2.0

• 4.0

What mass in grams of sodium trioxocarbonate (IV) is in 500cm³ of 0.1 mol dm^-3 of its solution?

(Na = 23, O = 16, C = 12)

• 4.6

• 5.3

• 10.0

• 10.2