
morning work
Quiz
•
Chemistry
•
1st - 5th Grade
•
Practice Problem
•
Hard
Paula Alikoba
Used 4+ times
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21 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
brass is an alloy of
A. lead and Tin
B. iron and carbon
C. copper and zinc
D. magnesium and aluminium
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
a mixture of sodium carbonate and sodium hydrogen carbonate can be separated by fractional crystallisation because the two salts have different
A. densities
B. solubilitiés
C. melting points
D. boiling points
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
the atomic number of an element T is 15. which one of the following is the nature of the oxide of T
A. acidic
B. neutral
C. basic
D. atmospheric
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
which one of the following substances is formed when sodium is burnt in limited amount of air
sodium oxide
sodium peroxide
sodium carbonate
sodium nitrate
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
which one of the following allotropes of sulphur is stable above 96⁰C
monoclinic sulphur
rhombic sulphur
plastice sulphur
amorphous sulphur
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
theatomic number of elements W,X,Y and Z are 9,11,12 and 14 respectively. which one of the following pairs of elements can combine to form a convalent compound
w and X
x and y
y and z
z and w
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
in which one of the following gases will magnesium burn to form a white solid that will react with water to form ammonia
NO2
N2O
NO
N2
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