05 May IP Chemistry Tuition – Question and Answer
1 At which temperature does a dilute aqueous solution of sodium chloride begin to boil?
A 96oC B 99oC
C 100oC D 104oC
2 Which diagram represents the arrangement of particles in a gas?
3 The table shows the boiling points of the elements found in a sample of liquid air.
Which elements would be gaseous at –190 °C?
A argon, helium and nitrogen
B argon, nitrogen and oxygen
C helium, neon and nitrogen
D helium, oxygen and neon
4 An element X forms a positive ion with the electronic structure 2,8,8.
What is the proton (atomic) number of X?
A 16 B 17
C 18 D 19
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