1997 年

The chemical properties of an element depend on

Elements X and Y form a compound having the following electronic structure :

(Only outermost shell electrons are shown.) Which of the following combinations is correct ?

Argon exists as a gas at room temperature and pressure because

Which of the following statements concerning the elements in the third period of the Periodic Table is correct ?

Which of the following diagrams best represents a part of the giant lattice of sodium chloride crystal ? (In these diagrams, ● represents Na⁺ ion and ○ represents Cl⁻ ion)

A 2.0 M sodium chloride solution is prepared by dissolving 11.7 g of sodium chloride in distilled water. What is the volume of the solution formed ? (Relative atomic masses : Na = 23.0, Cl = 35.5)

During the electrolysis of 1 M copper(II) chloride solution using copper electrodes, which of the following changes would occur at the electrodes ?

Which of the following conversions involves the smallest change in oxidation number of the underlined element ?

Metal X reacts with dilute nitric acid to give a colourless solution. When sodium hydroxide solution is added to the solution, a white precipitate which dissolves in excess sodium hydroxide solution is formed. X is probably

Which of the following combinations is INCORRECT ?