URGENT (PLEASE HELP)
Chemistry mcq
Which formula represents the oxide of an element Y in group I of the Periodic Table ?
A. YO
B. YO2
C. YO3
D. Y2O
8. Across a period elements are-
A. more metallic.
B. less metallic.
C. less non- metallic.
D. larger.
9. Which statement shows that iron is a translation metal?
A. Iron (ii) sulfate crystals are green
B. Iron (iii) oxide is basic
C. Iron ruts in moist air
D. Iron reacts with dilute hydrochloric acid
10. Element X forms a diatomic molecule. An atom of X requires one electron to form a stable
− X
ion. What can be deduced about X ?
A. It is a group I metal
B. it is a halogen
C. It is a noble gas
D. It is a reducing agent
11. Which statement is not correct ?
A. When a base reacts with an ammonium salt, ammonia is given off.
B. When an acid reacts with a base neutralisation takes place.
C. When an acid reacts with a carbonate, carbon dioxide is given off.
D. When the acidity of a solution increases the pH increases.
12. An atom of an element has eight electrons only.
Which statement about this elements is correct?
A. It forms an ion with two negative charges.
B. It has a full outer shell of electrons
C. It is a metal.
D. It is in group eight of the periodic table.
13. Which statement about the alkali metals is true?
A. they form covalent bonds with Group VII elements
B. they form oxides on reacting with water
C. their melting points decrease on descending Group I
D. their reactivities decrease on descending Group I
14. Element has an electronic configuration of 2, 8, 8, 1. Element Y has a configuration of 2, 8, 7.
What is likely to form if X and Y combine?
A. A covalent compound of formula XY
B. A covalent compound of formula XY2
C. An ionic compound of formula XY
D. An ionic compound of formula X2Y
15. Hydrochloric acid is used to clean metals. The acid reacts with the oxide layer on the surface of
the metal, forming a salt and water. Which word describes the metal oxide ?
A. Alloy.
B. Base
C. Element
D. Indicator
Answers
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Answer:
indicator
a covalent compound of formula XY2
y2o
hope it helps you
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