Chemistry 2018 | Study Mode

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Question 31
A
< 7 
B
> 7 
C
= 7 
D
Explanation.
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\(Cl_{2} + H_{2}O \to HCl + HOCl\)

The two compounds in the product end are acidic and hence, their mixture is acidic. Hence, the pH is < 7


Correct Option:
A
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Question 32
A
\(1.20 \times 10^{23}\) 
B
\(2.41 \times 10^{23}\) 
C
\(3.62 \times 10^{23}\) 
D
\(4.82 \times 10^{23}\) 
Explanation.
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\(1 mole = 6.02 \times 10^{23} atoms\)

\(0.2 moles = 6.02 \times 10^{23} \times 0.2\) atoms

= \(1.204 \times 10^{23}\)

\(\approxeq 1.2 \times 10^{23}\)


Correct Option:
A
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Question 33
A
charge density of the atoms 
B
ductility of the metal 
C
number of valence electrons 
D
total number of electrons in the atom 
Explanation.
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It is determined by the difference in the electron structures of the atoms. These primarily are: The number of outer electrons, i.e the number of valence shell electrons released during a metallic bond.


Correct Option:
C
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Question 34
A
oxidised 
B
reduced 
C
decomposed 
D
dissociated 
Explanation.
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Reaction: \(2AgNO_{3} + Zn \to Zn(NO_{3})_{2} + 2Ag\)

The oxidation number of Zn in the reactant is 0, and in the product is +2. Therefor, it is oxidized.


Correct Option:
A
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Question 35
A
\(Cu_{2}O\) 
B
\(CuO\) 
C
\(CuO_{2}\) 
D
\(CuO_{4}\) 
Explanation.
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Cu : O

0.067 : 0.066

mole ratio \(\frac{0.067}{0.066}\) : \(\frac{0.066}{0.066}\)

= 1 : 1

= CuO


Correct Option:
B
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Question 36
A
+2 to +3 
B
0 to +2 
C
+3 to +2 
D
+3 to 0 
Explanation.
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The oxidation number of Iron in \(FeCl_{3}\) = +3. The oxidation number in \(FeCl_{2}\) = +2.


Correct Option:
C
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Question 38
A
increases as nuclear charge increases 
B
decreases as nuclear charge increases 
C
decreases as nuclear charge decreases 
D
remains constant as nuclear charge increases 
Explanation.
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No official Explanation yet!


Correct Option:
B
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Question 39
A
1:1 
B
1:2 
C
2:1 
D
2:3 
Explanation.
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1g of Hydrocarbon = 0.93g of Carbon, therefore, Hydrogen = (1 - 0.93)g = 0.07g

C : H

0.93 : 0.07

\(\frac{0.93}{12}\) : \(\frac{0.07}{1}\)

0.078 : 0.07

\(\frac{0.078}{0.07} : \frac{0.07}{0.07}\)

\(\approxeq 1:1\)


Correct Option:
A
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Question 40
A
pure samples of the same compound contain the same elements combined in the same proportion by mass 
B
pure samples of substances are in the same proportion by mass 
C
chemical compounds are pure because they contain the same elements 
D
matter can neither be created nor destroyed. 
Explanation.
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The Law of Definite Proportions states that all pure samples of a particular chemical compound contain similar elements combined in the same proportion by mass.


Correct Option:
A
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