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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.

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

Question 2
A
5cm3 
B
10cm3 
C
20cm3 
D
25cm3 
E
50cm3 
Explanation.

\(2NaOH + H_{2}SO_{4} = Na_{2}SO_{4} + 2H_{2}O\)
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

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.

The IUPAC id for \(CH_{3}COOH\) is Acetic acid, while for \(C_{2}H_{4}\) is ethene.


Correct Option:
A

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.

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

Question 5
A
Na2CO3.10H2
B
NaNO3 
C
CuSO4 
D
CaCl2 
E
Na2SO4.10H2
Explanation.

Calcium chloride is a deliquescent substance. It attracts water from the atmosphere and then forms a solution.


Correct Option:
D

Question 6
A
0.3g 
B
1.5g 
C
2.4g 
D
3.0g 
Explanation.

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

Question 7
A
Ice at -10C 
B
Ice at 0C 
C
Water at 100C 
D
Steam at 100C 
Explanation.

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

Question 8
A
14 
B
12 
C
11 
D
10 
Explanation.

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

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.

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

Question 10
A
Pale green 
B
Pale red 
C
Brown 
D
Colourless 
Explanation.

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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