chemical substances class 7
Authored by Sameeksha Singh
Chemistry
7th Grade
Used 247+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
symbol of sodium
k
Fe
Na
Ag
2.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
balance the equation - H2 + O2 = H2O
2H2 + O2 = 2H2O
3H2 + O2 = 3H2O
H2 + O = H2o
3.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
decomposition reaction is just revers of combination reaction
true
false
4.
FILL IN THE BLANKS QUESTION
20 sec • 1 pt
name the ion =
ch3coo-
(a)
5.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
what is neutralisation reaction
a reaction in which two or more substances combine to form a new substances
a reaction between acid and base
a reaction in which a strong element displaces a weak element
6.
MULTIPLE CHOICE QUESTION
10 sec • 1 pt
what is the charge of zinc (Zn)
2+
3-
4-
8+
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
what is the name of -
CaCo3
calcium chloride
calcium phosphate
calcium carbonate
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