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 661:
Which type of salt is found in antacid medications and is used to relieve heartburn and indigestion?
Options:
A) Aluminum chloride
B) Magnesium chloride
C) Sodium chloride
D) Calcium chloride
Show Answer
The correct answer is B .
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Question 662:
When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called
Options:
A) electrovalent bond
B) co-ordinate bond
C) ionic bond
D) covalent bond
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The correct answer is B .
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Question 663:
Which of the following is a non-metal that remains liquid at room temperature?
Options:
A) Chlorine
B) Phosphorus
C) Bromine
D) Helium
Show Answer
The correct answer is C .
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Question 664:
How many alkoxyalkanes can be obtained from the molecular formula CHO?
Options:
A) 4
B) 2
C) 1
D) 3
Show Answer
The correct answer is D .
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Question 665: The molar ratio of oxygen to nitrogen in dissolved air is 2:1 whereas the ratio is 4:1 in atmospheric air because?
Options:
A) nitrogen is less soluble than oxygen
B) oxygen is heavier than nitrogen
C) nitrogen has a higher partial pressure in air
D) gases are hydrated in water
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The correct answer is A .
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Question 666:
Consider the solubility curves of three salts X, Y and Z given in the diagram. If each solution of the salt contains 200 g, and is heated to 100oC, which solution or solutions will deposit 100 g of the solute when suddenly cooled to 0oC?
Options:
A) X only
B) Y only
C) Z only
D) X and Z
E) Y and Z
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The correct answer is E .
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Question 667:
Calculate the percentage composition of oxygen in calcium trioxocarbonate(IV) [Ca=40, C=12, O=16]
Options:
A) 16
B) 48
C) 40
D) 12
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The correct answer is B .
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Question 668: A stream of air was successively passed through three tubes X, Y and Z containing a concentrated aqueous solution of KOH, red hot copper powder and fused calcium chloride respectively. What was the composition of the gas emanating from tube Z?
Options:
A) CO2 ad ithe inert gases
B) N2, CO2 and the inert gases
C) N2 and the inert gases
D) water vapour, N2 and the inert gases
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The correct answer is C .
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Question 669:
Which of the following equimolar solutions, Na2CO3 Na2 SO
4CI FeCI3 CH3COONa,
Have pH greater than 7?
Options:
A) FeCI 3 and NH 4CI
B) Na2CO3, CH3COONa and Na,Na2SO4
C) Na2CO3 and CH3COONa
D) FeCI3, CH3COONa and NH4CI
Show Answer
The correct answer is C .
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Question 670: Two elements, P and Q with atomic numbers 11 and 8 respectively , combine chemically to form the compound PxQY. The respective values of x and y are?
Options:
A) 1 and 1
B) 1 and 2
C) 2 and 1
D) 3 and 1
Show Answer
The correct answer is C .