The electronic configurations of three elements X, Y and Z are X – 2, 8; Y – 2, 8, 7; and Z – 2, 8, 2. Which of the following is correct?
Anonymous Quiz
12%
X is a metal
13%
Y is a metal
15%
Z is a non-metal
60%
Y is a non-metal and Z is a metal
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Which statement best describes the bonding in a nitrogen molecule (N₂)?
Anonymous Quiz
29%
Two nitrogen atoms share one pair of electrons.
22%
Two nitrogen atoms share two pairs of electrons.
36%
Two nitrogen atoms share three pairs of electrons.
13%
One nitrogen atom transfers three electrons to the other.
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Which of the following pairs will give displacement reactions?
Anonymous Quiz
21%
NaCl solution and copper metal
23%
MgCl₂ solution and aluminium metal
21%
FeSO₄ solution and silver metal
36%
AgNO₃ solution and copper metal
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Which of the following non-metals is lustrous?
Anonymous Quiz
21%
Sulphur
9%
Oxygen
8%
Nitrogen
62%
Iodine
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What is the composition of the alloy solder?
Anonymous Quiz
52%
Lead and Tin
23%
Copper and Zinc
20%
Copper and Tin
5%
Iron and Carbon
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:
Anonymous Quiz
51%
Calcium
24%
Carbon
12%
Silicon
13%
Iron
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