Chemistry

A dense white fume is formed when ammonia gas reacts with?

A. O2(g) B. H2(g) C. Cl2(g) D. HCl(g) Correct Answer: Option D - HCl(g)

4 years ago

When pure aluminium metal is heated to red hot in the presence of nitrogen gas; the compound formed is?

A. Al2N B. Al2N2 C. AlN D. Al2N3 Correct Answer: Option C - AlN

4 years ago

The density of a certain gas is 1.98gdm−³ at s.t.p. What is the molecular mass of the gas?

A. 44.0 g B. 54.0 g C. 26.0 g D. 31.0 g Correct Answer: Option A - 44.0 g Explanation…

4 years ago

What is the valence shell electron configuration of the element with atomic number 17?

A. 1s2 2s2 2p6 3s2 3p4 B. 1s2 2s2 2p6 3s2 3p5 C. 2s2 2p6 D. 3s2 3p5 Correct Answer:…

4 years ago

Which combination of the below refers to the uses of radioactive isotopes?

I. Treatment of cancer II. Detection of leakages in water mains III. Detection of the ages of ancient tools IV.…

4 years ago

A heterogenous mixture can be defined as any mixture?

A. of a solute and a solvent B. whose composition is uniform C. whose composition is not uniform D. formed…

4 years ago

An element will readily form an electrovalent compound if it electron configuration is?

A. 2, 8, 1 B. 2, 8, 4 C. 2, 8, 8 D. 2, 8, 5 Correct Answer: Option A…

4 years ago

The component of an atom that contributes least to its mass is the?

A. proton B. nucleus C. neutron D. electron Correct Answer: Option D - electron

4 years ago

Sugar is separated from its impurities by?

A. precipitation B. crystallization C. distillation D. evaporation Correct Answer: Option B - crystallization

4 years ago

Which of these properties gives a solid its definite shape?

A. strong intermolecular attraction B. high melting point C. high boiling point D. weak intermolecular attraction Correct Answer: Option A…

4 years ago