Acids and alkalis

Which of the following is INCORRECT for an acid?

• Sour taste

• pH is less than 7

• Turn red litmus solution blue

• Must contain H in the formula

Which of the following is NOT an acid?

• HCl

• CH₃COOH

• C₂H₆

• H₂SO₄

When magnesium ribbon is added to dilute hydrochloric acid, the followings will occur EXCEPT

• Gas bubbles are given off and a "pop" sound is heard when testing with a burning splint.

• The metal ribbon disolves to form a colourless solution.

• The salt form is magnesium chloride.

• The reaction is called neutralisation.

Which of the following metals has NO reaction with a dilute acid?

• Copper

• Zinc

• Calcium

• Iron

Which of the following gas will be formed when sodium hydrogencarbonate reacts with dilute hydrochloric acid?

• Hydrogen

• carbon dioxide

• Oxygen

• Nitrogen

Whihc of the following statement is True?

• The colour of methyl orange in acid solution is yellow.

• The basicity of CH₃COOH is 4.

• H₂SO₄ is a weak acid.

• A strong acid can completely dissociate in water to give H⁺ ions.

The follwoings are true for an alkali EXCEPT

• Bitter taste

• Phenolphthalein is red in the solution of an alkali.

• Methyl orange is red in the solution of an alkali.

• An alkali is a metal oxide or metal hydroxide which is soluble in water.

Which of the following will form a white precipitate?

• NaOH(aq) + ZnSO₄(aq)

• NaOH(aq) + FeSO₄(aq)

• NH₃(aq) + CaSO₄(aq)

• NH₃(aq) + CuSO₄(aq)

Which of the followings will give a deep blue solution when sodium hydroxide solution is added in excess?

• iron(II) sulphate solution

• copper(II) sulphate solution

• lead(II) nitrate solution

• zinc nitrate solution

Which of the following about ammonia is correct?

• Its formula is NH₄^+.

• It turns moist red litmus paper blue.

• It has no special odour (smell).

• It is an acid.