Chemistry (UI) | Study Mode

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Question 61
A
Decrease in temperature, increase in concentration of the reactant
B
Increase in temperature, addition of a catalyst, decrease in the surface area of the reactant
C
Increase in temperature, increase in concentration, addition of a catalyst and increase in the surface area of the reactant
D
Decrease in temperature, concentration and surface area of the reactants
E
Addition of catalyst and in the absence of light.
Explanation

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Correct option: C
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Question 62
A
Ca(OH)2
B
CaO
C
CaCO3
D
CaSO4. 2H2O
E
CaCl2
Explanation

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Correct option: B
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Question 63
A
it has an octet configuration
B
it is very stable
C
it is coloured
D
it has incomplete outer shell d-electrons
E
it has no electron in the d-orbital.
Explanation

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Correct option: D
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Question 64
A
electrolysis of dilute HCl
B
electrolysis of brine
C
neutralization of HCl
D
heating potassium trioxochlorate (V)
E
action of dilute mineral acids on bleaching powder.
Explanation

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Correct option: B
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Question 65
A
dissolve in alkalis
B
react violently with H2 without heating
C
displace each other from solutions of their salts
D
are gases
E
are liquids.
Explanation

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Correct option: A
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Question 66
A
liquid phosphorus
B
liquid gas
C
liquid paraffin
D
liquid nitrogen
E
butane.
Explanation

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Correct option: D
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Question 67
A
hydroxide
B
ozone
C
peroxide
D
sulphoxide
E
water.
Explanation

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Correct option: B
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Question 68
A
K
B
Cs
C
Sr
D
Rb
E
Fr
Explanation

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Correct option: C
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Question 69
A
C(s) + H2O(l) CO(g) + H2(g)
B
2 Na(s) + 2H20(1) 2 NaOH(aq) + H2(g)
C
Cu(s) + H2O(l) CuO(s) + H2(g)
D
2Al(s) + 3H2O(l) Al2O3(s) + 3H2(g)
E
Zn(s) + 2HCl(aq) ZnCl2(aq) + H2 (g)
Explanation

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Correct option: E
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Question 70
A
upper atmosphere
B
inner atmosphere
C
stratosphere
D
hemisphere
E
none of these.
Explanation

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Correct option: A

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