1) Which of the following best describes the given reaction: a) Displacement rea

Question

1) Which of the following best describes the given reaction:

a) Displacement reaction

b) Acid-Base reaction

c) Combination reaction

d) Decomposition reaction

e) Precipitation reaction

2) What is the oxidation state of Al in Al2O3?

+2

0

+1

+3

+4

3) Examine the following equations (A through C) for the reaction of hydrochloric acid with zinc metal:

Which equation (A, B, or C) is the net ionic equation for the reaction?

Equation C

Equation A

Equations B and C are net ionic equations

Equation B

4) Which of the following best describes the given reaction?

a) Decomposition reaction

b) Acid-Base reaction

c) Displacement reaction

d) Precipitation reaction

e) Combination reaction

Explanation / Answer

1)
Here two reactants are combining to form one product
So, this is combination reaction
Answer: c

2)

the oxidation number of O is -2
Let oxidation number of Al be x

use:
2*x + 3*(-2) = 0
2x - 6 = 0
x = +3
Answer: +3

3)
A is not correct because HCl(aq) should be decomposed as H+ and OH-
B is not correct because same ion is present on both sides
Answer: Equation C

4)
Here both the anions are exchanged and get new cation
So, this is double displacement reaction
Also PbI2 is solid product which makes it precipitation reaction
Answer: d

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