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Chemistry Questions and Answers

Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.

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1,141.

The gas given off when NH₄ Cl is heated with an alkali is

H₂

Cl₂

N₂

NH₃

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,142.

Determine the mass of sulphur (IV) oxide obtained when 91.0g of oxygen reacts completely with sulphur according to the following equation: S(s) + O $_2$ (g) → SO $_2$ (g) [S = 32; O = 16]

123g

139g

155g

182g

View answer & explanation

Correct answer is D

S + O $_2$ → SO $_2$ .

According to the equation 32g of O $_2$ produced 64g of SO $_2$

therefore 91g of O2 will produce yg of SO2
y = $\frac{91 * 64}{32}$

y = 182g of SO $_2$

1,143.

Calculate the mass of chlorine gas which occupies a volume of 1.12 dm $^3$ a volume of 1.12 dm $^3$ at s.t.p [Cl = 35.5, 1 mole og gas occupies 22.4 dm $^3$ at s. t. p ]

1.80g

3.55g

7.10g

15.50g

View answer & explanation

Correct answer is B

1 mole Cl $_2$ occupy 22.4dm $^3$
i.e 2 x 35.5 → 22.4 ; x → 1. 12
:. x = $\frac{1.12}{22.4}$ x 2 x 35.5 = 3.55

1,144.

What volume of hydrogen will be produced if 100cm³ of ammonia is completely decomposed at constant temperature and pressure? The equation for reaction is 2NH_3(g) → N_2(g) + 3H_2(g)

50cm³

150cm³

200cm³

300cm³

View answer & explanation

Correct answer is B

According to the equation 2NH₃ → N₃ + 3H₂
2 x 22400cm^{3^{of ammonia will produce

3 x 22400cm³ of hydrogen

If 100cm³ of NH₃ is used.

:. H₂ volume = \(\frac{100}{2x22400} x 3x22400

=150cm₃}}