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Chemistry Archives - Page 8 of 414 - Erudites Academy

Chemistry

How many moles HCl will be required to react with potassium heptaoxodichromate (VI) to produce 3 moles of chlorine?

A. 14 B. 12 C. 11 D. 10 Correct Answer: Option A - 14 Explanation K2Cr2O7 + HCl → Cl2…

4 years ago

50 cm³ of carbon (II) oxide was exploded with 150 cm³ of air containing 20% oxygen by volume. Which of the reactants was in excess?

A. Carbon (II) oxide B. Carbon (IV) oxide C. Oxygen D. Nitrogen Correct Answer: Option C - Oxygen Explanation 2CO…

4 years ago

Which of the following compounds is composed of Al; Si; O and H?

A. Epsom salt B. Limestone C. Clay D. Urea Correct Answer: Option C - Clay

4 years ago

Sieving is a technique used to separate mixture containing solid particles of?

A. small sizes B. large sizes C. different sizes D. the same sizes Correct Answer: Option C - different sizes

4 years ago

A mixture of iodine and sulphur crystals can be separated by treatment with?

A. Water to filter off sulphur B. carbon (IV) sulphide to filter off iodine C. ethanoic acid to filter off…

4 years ago

The electron configuration of 22X²+ ion is?

The electron configuration of 22X²+ ion is? A. 1s2 2s22p6 3s2 3p6 4s2 3d2 B. 1s2 2s22p6 3s2 3p6 4s2 3d1 C. 1s2 2s22p6 3s2 3p6 D. 1s2 2s22p6 3s2 3p6 4s2 Correct Answer: Option D - 1s2 2s22p6 3s2 3p6 4s2…

4 years ago

Which of the following statement is correct about the periodic table?

A. Elements in the same period have the same number of valency electron B. The valence electron of the elements…

4 years ago

The fundamental difference between the three states of matter is the?

A. shape of their particles B. number of particles in each state C. shape of the container they occupy D.…

4 years ago

The partial pressure of oxygen in a sample of air is 452mmHg and the total pressure is 780mmHg. What is the mole fraction of oxygen?

A. 0.203 B. 0.579 C. 2.030 D. 5.790 Correct Answer: Option B Explanation Mole fraction = Partial pressure of component/Total…

4 years ago

The ratio of the initial to final pressure of a given mass of gas is 1:1.5. Calculate the final volume of the gas if the initial volume was 300 cm³ at the same temperature?

A. 120 cm³ B. 200 cm³ C. 450 cm³ D. 750 cm³ Correct Answer: Option B - 200 cm³ Explanation…

4 years ago
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