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- 1. Multiple Choice
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
- 2. Multiple Choice
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
- 3. Multiple Choice
Which chloride compound would bleach the colour of a damp litmus paper at room temperature?
SnCl2
PbCl2
SiCl4
PbCl4
- 4. Multiple Choice
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.
- 5. Multiple Choice
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
- 6. Multiple Choice
Tetrachlorides of Group 14 elements in the Periodic Table are liquid at room temperature. The least thermally stable tetrachloride is
CCl4
GeCl4
SnCl4
PbCl4
- 7. Multiple Choice
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
- 8. Multiple Choice
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
- 9. Multiple Choice
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.
- 10. Multiple Choice
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
- 11. Multiple Choice
All elements of Group 14 in the Periodic Table form two oxides. Which statement is true about the oxides?
The oxides with +4 oxidation state react with alkali.
The thermal stability of the oxides with +2 oxidation state decreases down the group
The oxides with +2 oxidation state change from acidic to amphoteric down the group
The oxides with +2 oxidation state are less stable than the oxides with +4 oxidation state
- 12. Multiple Choice
Which causes tin and lead to have low melting points among the Group 14 elements of the periodic table?
Bigger atomic radii
Lattice structures
Weak metallic bonds
Inert pair effects
- 13. Multiple Choice
Carbon is the first element while lead is the last element in Group 14 of the Periodic table. Both form tetrachlorides. Which is true about these tetrachlorides?
Non-polar
Thermally stable
Volatile
React with water
- 14. Multiple Choice
The melting point of carbon, silicon and germanium are shown in the table below.The melting point decreases from carbon to germanium because the
strength of covalent bonds decrease
van der Waals forces decrease
electrical conductivity increases
atomic mass increases
- 15. Multiple Choice
Which ionic compound is stable due to the inert pair effect?
GeO
PbO2
PbCl2
SnCl4
- 16. Multiple Choice
The properties of compounds of an element are given below.
• The oxide of the element is amphoteric and stable
towards heat.
• The chloride of the element is acidic and liberates
chlorine gas on strong heating.
The compounds could be
CO2 and CCl4
SiO2 and SiCl4
SnO2 and SnCl4
PbO2 and PbCl4
- 17. Multiple Choice
Which is a common property for germanium and lead compounds?
Stability of +2 oxidation state of both compounds is due to the inert pair effect
Tetrachlorides of both compounds are thermally stable.
Dioxides of both compounds are amphoteric.
Monoxides of both compounds are basic.
- 18. Multiple Choice
Silicones are synthetic polymers with a variety of forms and uses. Most of the silicones are
chemically reactive
toxic
soluble in water
thermally stable
- 19. Multiple Choice
Two half-cell equations are given below. Which statement is true about the half-cell equations?
Y2+ ions are more stable than X2+ ions.
Y4+ ions are more stable than Y2+ ions.
X4+ ions are a stronger oxidising agent than Y4+ ions
X4+ ions could oxidise Y2+ ions.
- 20. Multiple Choice
The repeating unit of poly(dimethylsiloxane) is shown below. Which is not true about the property of poly(dimethylsiloxane) and its explanation?
A fluid due to the strong intermolecular forces
An insulator due to the lack of mobile ions and mobile electrons
Repels water due to the presence of hydrophobic group
Chemically stable due to the presence of strong Si—O, Si—C and C—H bonds
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