group 2, group 17, nitrogen and sulfur

group 2, group 17, nitrogen and sulfur

​

group 2

a review

Multiple Choice

which of the following is NOT true about group II compounds?

• calcium nitrate decomposes on heating to give corresponding oxide, NO2 gas and O2 gas

• The ease of thermal decomposition of group II carbonates increases down the group

• Reactivity of Group II oxide with water increases down the group

• solubility of sulfate increases down the group

Multiple Select

which of the following properties of group 2 elements decreases down the group?

• electronegativity

• melting point

• ionisation energy

Multiple Choice

when a mixture of white solids, X, is treated with an excess of dilute HCl, a colorless gas is evolved and some, but not all, of the mixture dissolves.

which mixture could X be?

• CaCO₃ and MgSO₄

• Ca(OH)₂ and MgCO₃

• BaSO₄ and CaCO₃

• Ba(NO₃)₂ and Ca(OH)₂

Multiple Choice

substance X reacts with water.

a gas is given off and the pH of the solution increases.

the solution is then reacted with H2SO4 and a white precipitate forms.

what could be substance be?

• barium

• barium oxide

• magnesium

• magnesium oxide

group 17

a review

Multiple Choice

for the sequence HCl, HBr, and HI

• enthalpy change of formation becomes less exothermic

• thermal stability increases

• the bond strength increases

• the acidity strength decreases

Multiple Select

which of the following statements about elements of group 17 is true

• the volatility of halogen decreases from F₂ to I2

• the oxidising strength of the halogen increases from F₂ to I₂

• The intensity of the color of halogen decreases from F₂ to I₂

Multiple Select

astatine is a group 17 element. which of the following statements about astatine is likely to be correct?

• silver astatide is readily soluble in HCl and aqueous NH₃

• potassium astatide reacts with hot conc H₂SO₄ to torm At₂

• Cl₂ reacts with KAt to form At₂ and KCl

Multiple Choice

the volatility of the Group 17 elements, chlorine, bromine and iodine, decreases down the group.

what is responsible for this trend?

• bond length in the halogen molecule

• bond strength in the halogen molecule

• electronegativity of the halogen atom

• number of electrons in the halogen atom

Multiple Select

conc H₂SO₄ is added to separate samples of HCl and HBr contained in different test tube.

what are the substances present in the test tubes upon completion of reaction?

• H₂O

• Br₂

• SO₂

• HCl

Multiple Choice

when Cl2 is passed into aqueous NaOH at rtp and the mixture is then heated the products formed are

• at rtp : Cl^-

  after heating : ClO^-

• at rtp : Cl^- and ClO^-

  after heating : ClO₃^-

• at rtp : Cl^-

  after heating : ClO^- and ClO₃^-

• at rtp : Cl^- and ClO^-

  after heating : Cl^- and ClO₃^-

Multiple Choice

what is the color of precipitate when potassium iodide is added to silver nitrate solution?

• white

• cream

• yellow

nitrogen and sulfur

a review

Multiple Select

Which gases will dissolve in water causing a lowering of the pH?

• oxides of nitrogen

• oxides of sulfur

• ammonia

Multiple Choice

the presence of triple bond in nitrogen causes its unreactivity

• true

• false

Multiple Select

In some rice-growing parts of the world, farmers use a combination of paddy fields and a fish farm. Rice paddy fields are flooded for much of the growing cycle and water running off the fields flows through pens where fish are raised. Nitrogen-based fertilisers are generally very soluble in water.

Which problems could result from farmers applying excess nitrogen-based fertilisers to their paddy fields?

• decreased fish production in the fish pens

• decreased levels of oxygen in the water

• increased growth of algae in the fish pens

Multiple Select

acid rain is a dilute solution of sulfuric acid.

which pollutant also contributes to the formation of acid rain? (tick two answers)

• carbon monoxide

• nitrogen dioxide

• sulfur dioxide

• water vapor