JAMB PRACTISE 3

Calculate the relative molecular mass of sodium tetraoxosulphate(VI). [Na = 23, H = 1, S = 32, O = 16]

Calculate the concentration in g/dm³ of a solution containing 0.01moldm³ of K₂CO₃. [K = 39, C = 12, O = 16]

• 0.47

• 0.67

• 1.38

• 1.40

A gas occupies 100cm³at 380mmHg and 310K. What is its volume in cm³ at s.t.p?

• 30

• 44

• 170

• 210

Calculate the mass in grams of 0.4 mole of carbon atom. (C = 12)

• 0.40

• 4.80

• 11.60

• 12.00

What volume of 0.40 mol/dm³ H₂SO₄ will be required to neutralize 20cm³ of 0.10mol/dm³ NaOH solution?

H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O

• 3.5

• 2.55

• 2.5

• 1.45

The oxidation state of copper in CuCl₂ is

• +3

• +2

• +1

• -1

How many moles are there in 10g of sodium trixonitrate(V)? [Na = 23, N = 14, O = 16]

• 1.12

• 1.00

• 0.12

• 0.11

Calculate the percentage of water of crystallisation in FeSO₄.7H₂O. [ Fe = 56, S = 32, O = 16, H = 1]

• 56.30

• 45.30

• 32.20

• 27.80

Organic compounds A and B have molecular formula CH₃CH₂OH and CH₃OCH₃ respectively. It can be deduced that both

• are alkanals

• are alkanols

• are isomers

• have the same structural formula

What is the solubility n moldm^-3 of 20g of CuSO₄ dissolved in 100g of water at 180⁰C? [CuSO₄ = 159.4]

• 0.01

• 0.13

• 0.25

• 1.25