quiz sec 3 chapter 2

All the following salts are soluble in water , except ……

• MgCO₃

• (NH₄)₂CO₃

• Na₂CO₃

• Mg(HCO₃)₂

Study the following reactions then answer

Na₂X + HCl (Y)_g colorless gas and has characteristic odor

(Y) + H₂SO₄ + K₂Cr₂O₇ green solution

So the anion which exists in (X) is ………and gas (Y) is ………..

• SO₃^-2 , H₂S

• SO₃^-2 , SO₃

• cl^- , HCl

• S₂O₃^-2 , SO₂

Farmers are suffering in desserts from the block out of irrigation pipes which dragging underground water that results an accumulation of (CaCO₃ , MgCO₃ ) on pipe walls . to get ride of these problem a flow of ……… must be pushed into center of irrigation pipes .

• Ammonia solution

• Caustic soda NaOH

• Lime water

• Carbon dioxide during irrigation

the main experiments to detect anions depends on idea of [formation a ppt] in identifying of anions of ...

• both groups of dil. HCI & conc. H2SO4

• both groups of dil. HCI & BaCl2 solution

• this idea not used in main experiments to detect of any anions

• no correct answer

Anion (X) not found in dil HCI group so:

• this anion may react with hot conc H2SO4 giving a gas

• this anion may react with BaCl2 solution giving a pptoins to atistic

• this anion may react with dil HCI giving a gas

• a & b are probable

If acid (A) is more stable than acid (B), so a gas can be obtained from reaction between

• acid (A) + salt of acid (B)

• salt of of acid (A) + salt of acid (B)

• salt of acid (A) + acid (B)

• acid (A) + acid (b)

………….... is used to distinguish between a solution of sodium nitrite and sodium nitrate

• Lead II acetate solution

• acidified potassium permanganate solution

• concentrated nitric acid

• iron III chloride solution

By heating iron II hydroxide in the air, and the resulting oxide reaction with sulfuric acid is formed

• Iron II sulfate and hydrogen gas

• Iron II sulfate and water

• Iron III sulfate and hydrogen gas

• Iron III sulfate and hydrogen gas

The anion that causes the formation of a White ppt. is formed which turns black by heating with a solution of silver nitrate is …………

• Br^-

• S^-2

• OH^-

• SO^-2₃

All of the following are dissolved in the ammonia solution except ……….

• silver iodide

• silver chloride

• silver bromide

• silver phosphate