Chemistry

An element X has isotopic masses of 6 and 7. if the relative abundance is 1 to 12.5 respectively, what is the relative atomic mass of X?

A. 6.0 B. 6.1 C. 6.9 D. 7.0 Correct Answer: Option C C. 6.9 Explanation Contribution by isotope 6 =…

6 years ago

How many orbitals are in the d-sub shell?

A. 1 B. 3 C. 5 D. 7 Correct Answer: Option C C. 5

6 years ago

What volume will 0.5 g of H2 occupy at s.t.p? [H = 1; 1 mole of a gas occupy 22.4 dm3 at s.t.p]

A. 2.24 dm³ B. 5.60 dm³ C. 11.20 dm³ D. 44.80 dm³ Correct Answer: Option B B. 5.60 dm³

6 years ago

Which of the these metals will not liberate hydrogen from dilute HCI?

A. Copper B. Iron C. Magnesium D. Zinc Correct Answer: Option A A. Copper

6 years ago

Pig-iron is brittle because it contains?

A. a high percentage of carbon as impurity B. calcium trioxosilicate (IV) C. unreacted haematite D. undecomposed limestone Correct Answer:…

6 years ago

The following substances are heavy chemicals except?

A. sodium trioxocarbonate (IV) B. tetraoxosulphate (VI) acid C. lead (lV) tetraethyl D. sodium hydroxide Correct Answer: Option C C.…

6 years ago

Which of the following methods can be used to separate a mixture of two miscible liquids with different boiling points?

A. Decantation B. Distillation C. Evaporation D. Filtration Correct Answer: Option B B. Distillation

6 years ago

From the following ores is iron extracted? I. Haematite ll. Bauxite III. Magnetite IV. Cassiterite

A. l and ll only B. l and lll only C. l, ll and lll only D. l, ll, lll…

6 years ago

Glucose reduces Fehling’s solution on warming to?

A. copper (l) oxide B. copper (ll) oxide C. copper (l) chloride D. copper (ll) hydroxide Correct Answer: Option A…

6 years ago

Which of the following compounds react readily with sodium to liberate hydrogen?

A. CH3CH2CH3 B. CH3COOH C. CH3CH2CHO D. CH3CH(OH)CH3 Correct Answer: Option B B. CH3COOH

6 years ago