Which of the following is a characteristic property of alkalis? A They have a pH less than 7. B They turn blue litmus paper red. C They liberate ammonia from ammonium salts. D They liberate carbon dioxide from carbonates.

4.Which property is NOT characteristic of ionic compounds?

Which of the following traits characterises the alkali metals?Group of answer choicesvery high melting pointexistence as diatomic moleculesgenerally form -2 anionsthe lowest first ionisation energy values of the elements in each periodthe smallest atom in each period

**9. Which of the following is NOT a property of acids?a) They taste sourb) They turn blue litmus paper redc) They are proton acceptorsd) They react with metals to produce hydrogen gas

Which of the following properties is not indicative of a base? A Carbon dioxide is released when it reacts with a carbonate. B A salt is formed on reaction with an acid. C Ammonia is released on reaction with an ammonium salt. D Universal indicator paper turns blue when placed in an alkaline solution.

Question 25 (4 points) Identify the properties of an acid more than 1 can be selected Question 25 options: litmus paper turns red feels slippery produces hydrogen gas when reacting with metals can produce ammonia gas classified as an electrolyte a molecular compound dissociates when colliding with water molecules decreases the hydroxide ion concentration Question 26 (4 points) Select the properties of a base. More than one can be selected. Question 26 options: NH3 is an example the concentration of H+ could be 3x10-9mol/L litmus paper turns red has a pH above 7 increases the hydroxide ion concentration they react with carbonates H3PO2 is an example they are proton acceptors Question 27 (3 points) Which of the following are examples of chemicals using ionization to form ions? [More than one can be selected] Question 27 options: salt in water weak base in water weak acid in water strong acid in water sugar in water strong base in water Question 28 (4 points) Match the term with the correct description. Question 28 options: The smaller amount in a solution A mixture that has a uniform appearance The substance that separates the ions in a solution the process of adding more solvent to a solution the maximum amount of solid that has dissolved in a solvent a example of a solution involving solids Two substances that have no limits in terms of mixing A solid that does not dissolve in a liquid 1. solute 2. solvent 3. homogeneous 4. miscible 5. insoluble 6. saturated 7. dilute 8. alloy