$$\(18 Q\)$$ is a semi-conductor. The chloride of $$\(Q\)$$ reacts with water to form white fumes and an acidic solution. Which Period 3 element is Q ?
A.
magnesium
B.
aluminium
C.
silicon
D.
phosphorus
Exam No：9701_w24_qp_11 Year：2024 Question No：18
Answer:
C
Knowledge points:
11.2.1 describe the relative reactivity of the elements as oxidising agents
11.2.2 describe the reactions of the elements with hydrogen and explain their relative reactivity in these reactions
11.2.3 describe the relative thermal stabilities of the hydrogen halides and explain these in terms of bond strengths
9.3.1 predict the characteristic properties of an element in a given group by using knowledge of chemical periodicity
9.3.2 deduce the nature, possible position in the Periodic Table and identity of unknown elements from given information about physical and chemical properties
Solution:
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