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Worksheetschemical reaction
Total questions: 10
Worksheet time: 10mins
Name
Class
Date
1.
Which of the following statements about the given reaction are correct?3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g)(i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent
a)
(i), (ii) and (iii)
b)
(iii) and (iv)
c)
(i), (ii) and (iv)
d)
(ii) and (iv)
2.
The following reaction is an example of a 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)(i) displacement reaction (ii) combination reaction (iii) redox reaction (iv) neutralisation reaction
a)
(i) and (iv)
b)
(ii) and (iii)
c)
(i) and (iii)
d)
(iii) and (iv)
3.
A teacher writes the equation representing the chemical reaction between hydrochloric acid and sodium on the board.HCl + Na → NaCl + H2The teacher states that the equation has not been balanced. Which of these correctly shows the products of this reaction after the equation has been balanced?
a)
Na2Cl + H2
b)
2NaCl + H2
c)
NaCl + 2H2
d)
2NaCl + 2H2
4.
What is the charge of Iron in this compound. (Hint: think criss cross method):
Fe3(PO4)2
a)
3+
b)
2+
c)
1+
d)
6+
5.
What type of chemical reactions take place when electricity is passed through water?
a)
Displacement
b)
Combination
c)
Decomposition
d)
Double displacement
6.
Silver article turns black when kept in open for a few days due to formation of
a)
H2S
b)
AgS
c)
AgSO4
d)
Ag2S
7.
Chemical formula of quick lime is :
a)
CaO
b)
Ca(OH)2
c)
CaCO3
d)
CO2
8.
Which gas is evolved when sodium carbonate reacts dilute hydrochloric acid?
a)
Carbon monoxide
b)
Carbon dioxide
c)
Chlorine
d)
Sodium oxide
9.
Which gas is evolved when zinc is added to dilute sulphuric acid?
a)
Hydrogen
b)
Oxygen
c)
Sulphur dioxide
d)
Sulphur trioxide
10.
The first part of a balanced chemical equation is shown: H2SO4 + 2NaOH → ________. In order for this equation to be balanced, how many hydrogen (H) atoms must be present in the products?
a)
2
b)
3
c)
4
d)
5
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