Chemistry is the study of the substances that make up matter. It looks at their properties, how they react with each other, and how these reactions can create new substances.
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Question 311:
Cu2+(aq) + 4NH3(g) ↔ [Cu(NH3)4]2+(aq)
In the reaction above, what is the effect of precipitating Cu2+(aq) as CuS(s)?
Options:
A) NH3(g) concentration will decrease
B) more NH3(g)
C) The equilibrium will shift to the right
D) There will be no effect
Show Answer
The correct answer is C .
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Question 312:
The functional group represented in the compound above is
Options:
A) alkanol
B) alanal
C) alkanone
D) alanoate
Show Answer
The correct answer is C .
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Question 313: Lucas reagent is used to test for
Options:
A) alkanes
B) alkanoic acids
C) alkanols
D) amines
Show Answer
The correct answer is C .
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Question 314: Hardening of an oil may achieved by?
Options:
A) boiling the oil with water
B) boiling the oil with a catalyst
C) treating the oil with sodium hydroxide
D) treating the oil with hydrogen and catalyst
E) distilling oil under reduced pressure
Show Answer
The correct answer is D .
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Question 315:
The number of electrons in the valence shell of an element of atomic number 14 is?
Options:
A) 1
B) 2
C) 3
D) 4
Show Answer
The correct answer is D .
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Question 316: Phosphorus burns in oxygen according to the equation P4 + 502 → P4O10. How many litres of oxygen will be required at S.T.P for complete oxidation of 12.4g of phosphorus? [P = 31,O = 16 and molar volume of a gas at S.T.P = 22.4 litres]
Options:
A) 5. 20
B) 11. 20
C) 2. 24
D) 20. 20
E) 6. 20
Show Answer
The correct answer is B .
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Question 317:
The number of grammes of potassium hydroxide in 250cm3 of one molar solution is?
(K = 39, O = 16, H = 1)
Options:
A) 40g
B) 52g
C) 100g
D) 26g
E) 14g
Show Answer
The correct answer is E .
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Question 318:
N2(g) + O2(g) ↔ 2NO(g); ΔH = + 180.6 kJ mol-1
In the reaction above, increase in temperature will
Options:
A) increase the quantity of N2
B) increase in the yield of NO
C) decrease the yield of NO
D) decrease the quantity of O2
Show Answer
The correct answer is B .
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Question 319: In which of the following is the oxidation number of sulphur equal to -2?
Options:
A) S8
B) H2S
C) SO 2
D) SO 32-
Show Answer
The correct answer is B .
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Question 320:
Atoms of element X (with 2 electrons in the outer shell). combine with atoms of Y (with 7 electrons in the outer shell).
Which of the following statements is FALSE? The compound formed
Options:
A) has formula XY
B) is likely to be ionic
C) contains X2+ ions
D) contains Y- ions
Show Answer
The correct answer is A .