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Question 1
A
both processes are exothermic 
B
both processes are endothermic 
C
the dissolution of metallic sodium is endothermic 
D
the dissolution of metallic sodium is exothermic 
E
the dissolution of sodium chloride is explosive 
Explanation.
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When small quantities of sodium metal is added to water, there is an exothermic reaction, and they react to form sodium hydroxide and hydrogen.


Correct Option:
D
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Question 2
A
5cm3 
B
10cm3 
C
20cm3 
D
25cm3 
E
50cm3 
Explanation.
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\(2NaOH + H_{2}SO_{4} = Na_{2}SO_{4} + 2H_{2}O\)
V x 0.5M = 2(10 x 1.25)
0.5V = 2 x 12.5
0.5V = 25
V = \(\frac{25}{0.5}\) = \(50cm^{3}\)


Correct Option:
E
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Question 3
A
acetic acid and ethene 
B
ethanoic acid and ethene 
C
methanoic acid and ethylene 
D
ethanol and ethene 
E
acetic acid and ethylene 
Explanation.
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The IUPAC id for \(CH_{3}COOH\) is Acetic acid, while for \(C_{2}H_{4}\) is ethene.


Correct Option:
A
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Question 4
A
the temperature at which its vapour pressure equals the atmospheric pressure 
B
the temperature at which bubbles begin to form 
C
the temperature at which the vapour pressure equals 1 temperature 
D
the temperature at which the rate of condensation of vapour equals the rate of vaporisation of the liquid 
E
the temperature at which the space above the liquid is saturated 
Explanation.
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The normal boiling point is the temperature at which the vapour pressure is equal to the standard sea-level atmospheric pressure which is 760 mm [29.92 inches] of mercury.


Correct Option:
C
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Question 5
A
Na2CO3.10H2
B
NaNO3 
C
CuSO4 
D
CaCl2 
E
Na2SO4.10H2
Explanation.
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Calcium chloride is a deliquescent substance. It attracts water from the atmosphere and then forms a solution.


Correct Option:
D
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Question 6
A
0.3g 
B
1.5g 
C
2.4g 
D
3.0g 
Explanation.
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Molar conc. =no.of molesVol in dm3
Vol=250cm3= 0.25dm3
Molar conc=0.5M
No of moles=molar conc *Vol in dm3
=0.5*0.25
=0.125mole of HCl
2moles of HCl Mole of Mg
0.125 mole (0.125*1)/2
=0.0625mole of Mg
Reacting mass=no of moles* molar mass
Mg=24
Mass=0.0625*24
=1.5g


Correct Option:
B
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Question 7
A
Ice at -10C 
B
Ice at 0C 
C
Water at 100C 
D
Steam at 100C 
Explanation.
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The gaseous state of matter has the most disorderly arrangement of particles. Hence, steam (water in gaseous form) is the most disorderly arrangement on the list.


Correct Option:
D
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Question 8
A
14 
B
12 
C
11 
D
10 
Explanation.
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K\(_{2}\)Cr\(_{2}\)O\(_{7}\) + HCl Cl\(_{2}\) + KCl + CrCl\(_{3}\) + H\(_{2}\)O

Balancing the equation, we have

K\(_{2}\)Cr\(_{2}\)O\(_{7}\) + 14HCl 3Cl\(_{2}\) + 2KCl + 2CrCl\(_{3}\) + 7H\(_{2}\)O


Correct Option:
A
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Question 9
A
2.029 * 10-3mol dm-3 
B
1.414 * 10-3mol dm-3 
C
2.029 * 10-5mol dm-3 
D
1.414 * 10-5mol dm-3 
Explanation.
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In order to calculate this, it suffices to calculate the solubility of Ag, so as to know the amount lost.

\(K_{sp} = [Ag^{+}][Cl^{-}]\)

Let the solubilty of Ag and Cl = d

\(2 \times 10^{-10} = d \times d= d^{2}\)

\(d = \sqrt{2\times10^{-10}}\)

= \(1.414 \times 10^{-5}moldm^{-3}\)


Correct Option:
D
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Question 10
A
Pale green 
B
Pale red 
C
Brown 
D
Colourless 
Explanation.
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A reaction between Iron (iii) chloride and Hydrogen sulphide leads to the reaction

2FeCl3(aq) + H2S(g) 2FeCl2(aq) + 2HCl(aq) + S(s)

The colour change is from REDDISH BROWN to PALE GREEN.


Correct Option:
A
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