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 391: Which of the following will produce a solution with pH less than 7 at equivalent point?
Options:
A) HNO 3 +NaOH
B) H 2SO 4 + KOH
C) HC +Mg (OH) 2
D) HNO 3 + KOH
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The correct answer is C .
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Question 392:
NaCI(s) + H2SO4(I) → HCI(g) + NaHSO4(s).
In the reaction above, H2SO4 behaves as?
Options:
A) a strong acid
B) an oxidizing agent
C) a good solvent
D) a dehydrating agent
Show Answer
The correct answer is A .
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Question 393: Calcium hydroxide and ammonium chloride when heated together will give an important product. This compound may be obtained dry by
Options:
A) dissolving it in water, recrystallizing it and then drying in the oven
B) passing it through a concentrated aqueous solution of sodium hydroxide
C) passing it through calcium oxide
D) passing it through concentrated sulphuric acid
E) passing it through anhydrous calcium choride
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The correct answer is C .
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Question 394:
An organic compound contains 69% carbon, 15.3% hydrogen and 30.7% oxygen. Calculate the the empirical formula [C=12, H = 1, O = 16]
Options:
A) CHO
B) CHO
C) CHO
D) CHO
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The correct answer is D .
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Question 395: Electronic configuration of an elements 13x in the subsidiary energy level is
Options:
A)
B)
C)
D)
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The correct answer is A .
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Question 396:
What quantity of aluminium is deposited when a current of 10A is passed through a solution of an aluminium salt for 1930s?
[Al = 27, F = 96500 C mol -1]
Options:
A) 0.2 g
B) 1.8 g
C) 5.4 g
D) 14.2 g
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The correct answer is B .
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Question 397: An amphoteric oxide is an?
Options:
A) amorphous oxide of a metal
B) amorphous oxide of a non-mental
C) oxide that is insoluble in water
D) oxide that behaves both as a base as well as an acid
E) oxide that loses its oxygen on sublimation
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The correct answer is D .
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Question 398: For a gas, the relative molecular mass is equal to 2Y. What is Y?
Options:
A) The mas of the gas
B) The vapour density of the gas
C) The volume of the gas
D) The temperature of the gas
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The correct answer is B .
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Question 399: Which of these salts will produce its metal, oxygen and nitrogen (IV) oxide on heating?
Options:
A) Silver and trioxonitrate (V)
B) Sodium trioxonitrate (V)
C) Calcium trioxonitrate (V)
D) Lithium trioxonitrate (V)
Show Answer
The correct answer is A .
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Question 400:
With conc H2SO4 as catalyst
CH3COOH + C2H5OH → CH3COOC2H5 + H2O
Options:
A) esterification
B) Condensation
C) saponification
D) neutralization
Show Answer
The correct answer is A .