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WorksheetsChem-is-try Challenge 18
Total questions: 8
Worksheet time: 16mins
Which is not the use of magnesium compound?
MgCO3 is used as an antacid to treat heartburn
Mg(OH)2 is a constituent of toothpaste
MgSO4 is used to obtain X-ray photograph of the digestive system
Mg(NO3)2 is used as a fertiliser
The melting point of carbon, silicon and germanium are shown in the table below
Carbon: 3547 0C, Silicon: 1410 0C, Germanium: 937 0C
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
Which ionic compound is stable due to the inert pair effect?
GeO
PbO2
PbCl2
SnCl2
The thermal stability of hydrogen halide, HX decreases from HF to HI because the
electronegativity of X decreases
attractive forces between HX molecules increase
H-X bond length increases
attractive forces between the nucleus and valence electrons of X decrease
Concentrated H2SO4 acts as an acid and an oxidising agent when it reacts with NaX. Which equation shows that H2SO4 is reduced completely?
NaCl + H2SO4 → NaHSO4 + HCl
2NaBr + 2H2SO4 → Na2SO4 + Br2 + SO2 + 2H2O
2NaI+ 2H2SO4 → Na2SO4 + I2 + SO2 + 2H2O
8NaI + 5H2SO4 → 4Na2SO4 + 4I2 + H2S + 4H2O
Titanium and calcium are in the same period in the Periodic Table. Which property of titanium is lower than or smaller than that of calcium?
Density
Atomic size
Melting point
Electrical conductivity
An aqueous solution of KCN is added to an aqueous solution of [FeCl6]3- ion. The reaction equation is shown below.
[FeCl6]3-(aq) + 6CN-(aq) → [Fe(CN)6]3-(aq) + 6Cl-(aq)
I The donor atom in CN- ligand is N
II The oxidation number of Fe changes
III [Fe(CN)6]3- is more stable compared to [FeCl6]3-
Iv Both [Fe(CN)6]3- and [FeCl6]3- have the same shape
Which statements are true about the reaction?
I and II
I and IV
II and III
III and IV
Which statement is true of tris(ethanedioato)cuprate(II) ion?
The charge of the complex ion is 4-
The ligand is monodentate
The metal ion acts as Lewis base
Cu2+ ion uses empty 3d orbital
