quiz 4 general properties

The compounds FeCl2, FeCl3 and Fe2(SO4)3 are ……………

• paramagnetic and coloured

• diamagnetic and colourless.

• paramagnetic and colourless

• diamagnetic and coloured

Which of the following ions has colored aqueous solutions?

• Fe3+ only

• Al3+ only

• Fe3+ and Ni2+ only

• Al3+, Fe3+ and Ni2+

In which of the following equations (M) represents scandium?

• FeO(s) + M(s) → Fe(s) + MO(s)

• 2M(s) + 6H2O(l) → 2M(OH)3(aq) + 3H2(g)

• M(s) + H2SO4(aq) → MSO4(aq) + H2(g)

• 2M(s) + O2(g) → 2MO(s)

Which of the following compounds when heated does not lead to the evolution of O2 gas?

• KMnO4

• (NH4)2Cr2O7

• K2Cr2O7

• H2O2

Which of the following compounds its aqueous solution is colored?

• Zn(NO3)2

• LiNO3

• Co(NO3)2

• Ba(NO3)2

CuSO4.5H2O is blue because …

• SO4 2– ions absorb the red light from the visible spectrum

• Cu2+ ions absorb all the spectrum colors except red

• Cu2+ ions absorb all the orange light from the visible spectrum

• Each CuSO4 molecule combines with 5H2O molecules

Two iron ores : (A) is preferred than (B) , the reason is ……….

• (A) contains more ratio of sulphur, phosphors & iron

• (B) contains less ratio of sulphur , phosphors & iron

• (A) contains less ratio of sulphur , phosphors & arsenic

• (B) contains more ratio of iron

The correct order of magnetic moment is:

• FeCl3 > TiO2 > Cr2O3

• Cr2O3 > FeCl3 > TiO2

• FeCl3 > Cr2O3 > TiO2

• TiO2 > FeCl3 > Cr2O3

The magnetic moment of … is 4

• Cu +2

• Mn+6

• Fe+2

• Zn+2

The chromium compound that have a green color has ….. free electrons in its ions

• 1

• 2

• 3

• 4