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1. The order of reactivity of four elements is J>M>Q>T i.e. J is the most reactive and T the least reactive.
 
A series of reactions are given below:
 
a.    1  MCl2  +  T  →       TCl2   +   M 
b.    2  MSO4  + J    → JSO4   +  M 
c.     3  TO  +    Q     → QO   +   T 
d.    4  QO  +  J  → JO   +  Q 
e.    5  JSO4   + T    → TSO4  +   J 
f.     6  MO +    Q    → QO  + M 
 
Which three reactions could take place?
 
A) 1, 2 and 3
B) 2, 3 and 4
C) 4, 5 and 6
D) 1, 4 and 6
 
 
2. A compound of iodine and oxygen contains 63.5g of iodine and 20.0g of oxygen.
 
Which of the following would be its formula?
 
(Ar : I = 127; O = 16)
 
A)   IO
B)    IO2
C)    I2O
D)   I2O3
E)    I2O5
F)    I5O2
 
3. A metal, X, is in group III of the periodic table. A non-metal, Y, is in group VI of the periodic table. They react together to form a compound.
 
What is the formula of the compound?
A)   X2Y
B)    X2Y3
C)    X3Y2
D)   X3Y6
E)    X6Y3
 
4. Carbon, in the form of coke, is used to reduce iron oxide in a blast furnace. The three stages are shown below:
 
a.    C + O2 → CO2
b.    CO2+ C → 2CO
c.     3CO + Fe2O3→ 2Fe + 3CO2
 
If 12g of carbon is used in stage 2 and all the carbon monoxide produced is used in stage 3, what mass of carbon dioxide is produced in stage 3?
(Ar : C = 12; O = 16)
 
A)   17.8g
B)   35.6g
C)   44g
D)   88g
E)   132g
 
 
5. 2.74g of 1-bromobutane is reacted with excess aqueous sodium hydroxide to produce 1.11g of butan-1-ol according to the equation below.
 
C4H9Br + NaOH → C4H9OH + NaBr
 
What is the percentage yield of butan-1-ol?
(Ar : H = 1; C = 12; O = 16; Na = 23; Br = 80)
 
A)   26%
B)   40%
C)   54%
D)   75%
 
6. The equation for the preparation of nitrogen monoxide is:
 
a Cu + b HNO3àa Cu (NO3)2+ c H2O + 2NO
 
What is the value of b?
A)   2
B)   4
C)   6
D)   8
E)   12
F)    16

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