WorksheetsChem-is-try Challenge 32
Total questions: 8
Worksheet time: 16mins
The first ionisation energy generally increases across a period in the Periodic Table. Which statement explains why the first ionisation energy of sulphur is lower than that of phosphorus?
The electron in the p orbitals of sulphur experience greater electrostatic repulsion than phosphorus
The sulphur atom has more electrons than phosphorus atom
The S-S bond is weaker than the P-P bond
The size of S8 molecule is bigger than P4 molecule
Elements X, Y and Z are located in Period 3 of the Periodic Table. The reactivity of these elements towards oxygen is shown in the table below
X: does not react
Y: reacts slowly
Z: reacts vigorously
The arrangement of the elements according to the ascending order of their proton number is
X, Y, Z
Z, Y, Z
Z, X, Y
Z, Y, X
Which oxide of an element dissolves in water to form an acidic solution?
Sodium
Magnesium
Silicon
Phosphorus
Be(OH)2 decomposes to BeO when heated to 1380C. Which statement explains why Be(OH)2 decomposes at such a temperature?
Be2+ ion is small
Be2+ ion has high charge density
The O-H bond in Be(OH)2 is polar
BeO is a covalent compound
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
MO2 is a reducing agent
M is a good electrical conductor
The halogens are important chemicals in our daily lives. Which statement about Cl2, Br2 and I2 is true?
The halogens can act as both oxidising and reducing agents
The strength of the van der Waals forces increases from Cl2 to I2
Cl2, Br2 and I2 are formed when their respective halides react with concentrated H2SO4
Cl2, Br2, and I2 react vigorously with hydrogen gas in the presence of ultraviolet light
Chlorine gas is bubbled into a concentrated solution of aqueous sodium hydroxide. The equations for the reactions are as follows:
Cl2 + 2NaOH → NaCl + NaClO + H2O
3NaClO → 2NaCl + NaClO3
Which statement about the reaction is correct?
One mole of Cl2 forms one mole of NaClO3
The anions formed are weak conjugate bases
The oxidation states of Cl changes from 0 to -1; +1 to +5
The final reactions is fast at room temperature
Transition elements formed coloured ions as a result of d-d transitions. The probable electronic configuration of a coloured ion is
1s22s22p63s23p6
1s22s22p63s23p63d1
1s22s22p63s23p63d10
1s22s22p63s23p63d104s2
