Group 14 elements

A thermally stable liquid, MCl₄, reacts with water to form a solution of low pH value. Which statement about M or its oxides is true?

• MO is an acidic oxide

• MO exists as simple molecules

• MO is a reducing agent.

• M is a good electrical conductor

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NGSS.HS-PS1-1

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Solder is an alloy which is made of tin and lead. Which is the main role of tin in solder?

• Lower the melting point

• Increase conductivity

• Resist corrosion

• Increase lustre

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NGSS.HS-PS2-6

Which chloride compound would bleach the colour of a damp litmus paper at room temperature?

• SnCl₂

• PbCl₂

• SiCl₄

• PbCl₄

Which statement is true of the oxides of Group 14 elements in the Periodic table on descending the group?

• The thermal stability of the dioxides of the elements increase.

• The stability of the +2 oxidation state of the elements decrease.

• The ionic properties of the monoxides of the elements increase.

• The acid-base properties of the dioxides of the elements change from acidic to basic.

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NGSS.HS-PS1-1

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Monoxides and dioxides of Group 14 elements in the Periodic Table show different acid-base properties. Which is an acidic oxide?

• GeO

• PbO

• SiO₂

• SnO₂

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NGSS.HS-PS1-1

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Tetrachlorides of Group 14 elements in the Periodic Table are liquid at room temperature. The least thermally stable tetrachloride is

• CCl₄

• GeCl₄

• SnCl₄

• PbCl₄

Silicones are inert and non-toxic because silicones

• are inorganic polymers

• are saturated molecules

• have many hydrophobic groups

• have strong Si—O and Si—C bonds

PbCl₄ could be used as a source of Cl₂ gas. Which statement is correct about the property of PbCl₄ ?

• It is polar

• It is soluble in water

• It is a reducing agent

• It is thermally unstable

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NGSS.HS-PS1-1

BeSO₄ and SrSO₄ have different solubility in water. Which statement explains the difference?

• Sulphate anion is large.

• BeSO₄ has covalent character.

• Lattice energy of SrSO₄ is more negative than that of BeSO₄.

• Hydration energy of BeSO₄ is more negative than that of SrSO₄.

Tetrachlorides of Group 14 in the Periodic Table are colourless and volatile liquids. Which statement is true about the first and the last tetrachlorides of group 14?

• CCl₄ is more stable when heated compared to PbCl₄.

• CCl₄ has a lower boiling point compared to PbCl₄.

• CCl₄ is a covalent whereas PbCl₄ is an ionic compound.

• CCl₄ and PbCl₄ undergo hydrolysis

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NGSS.HS-PS1-1