Chemistry

Which of the following metals would readily displace hydrogen from steam?

A. Copper B. Lead C. Magnesium D. Silver Correct Answer: Option C C. Magnesium

6 years ago

The volume occupied by 0.4 g of hydrogen gas at s.t.p. is? [H = 1. 00; Molar volume at s.t.p. = 22.4 dm³]

A. 2.24 dm³ B. 4.48 dm³ C. 22.4 dm³ D. 44.8 dm³ Correct Answer: Option B B. 4.48 dm³

6 years ago

When a substance changes directly from the solid state to the gaseous state without forming a liquid, the substance is said to?

A. condense B. evaporate C. sublime D. precipitate Correct Answer: Option C C. sublime

6 years ago

MgO does not readily dissolve in water because?

A. of its high melting point B. it is a covalent compound C. it forms a hydroxide when dissolved in…

6 years ago

The vapour pressure of a liquid depends on?

l. temperature. ll. rate of condensation. III. cohesive forces holding the particles together A. l only B. l and ll…

6 years ago

The complex compound formed when aluminium dissolves in aqueous sodium hydroxide is?

A. Na3AI(OH)4. B. NaAl(OH)4 C. NaAl(OH)3 D. Na2Al(OH)3 Correct Answer: Option B B. NaAl(OH)4  

6 years ago

The complex compound formed by the combination of two elements with a large electronegativity difference is likely to be?

A. polar covalent B. giant molecular C. covalent D. ionic Correct Answer: Option D D. ionic

6 years ago

A metal M forms two types of chlorine, MCI2 and MCI3 which of the following laws best explains the relationship between the chlorides? Law of

A. conservation of mass B. definite proportion C. multiple proportions D. reciprocal proportion Correct Answer: Option C C. multiple proportions

6 years ago

A sample of a gas may be identified as chlorine if it turns?

A. damp blue litmus paper red B. lime water miky C. lead ethanoate paper black D. starch iodide paper blue-black…

6 years ago