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 621: The most suitable metal that can be used as lightning conductor is
Options:
A) silver
B) copper
C) iron
D) aluminium
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The correct answer is B .
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Question 622: Which of the following is observed when a solution of iron (III) chloride is mixed with a solution of sodium hydroxide?
Options:
A) A gas is evolved
B) A deep blue precipitate is formed
C) The resultant solution turns green turns
D) A brown precipitate is formed
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The correct answer is D .
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Question 623: The general formula of an alkyl halide (which represent the halide) is?
Options:
A) CnH2n - 2X
B) CnH2n + 1X
C) CnH2n + 2X
D) CnH2nX
E) CnH2n - 1
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The correct answer is B .
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Question 624:
Which of the following is the best starting material for the preparation of oxygen? Heating of trioxonitrate (v) with
Options:
A) Pb
B) Zn
C) Ca
D) Na
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The correct answer is A .
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Question 625:
Which of the following gases will rekindle a brightly splint?
Options:
A) NO
B) NO
C) NO
D) CL
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The correct answer is C .
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Question 626: The condition required for corrosion to take place is the presence of
Options:
A) Oxygen and Carbon (IV) oxide
B) Water and Oxygen
C) Water and Carbon (IV) oxide and Oxygen
D) Water and Carbon (IV) oxide
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The correct answer is B .
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Question 627: The group IA metals are not found free in nature because they
Options:
A) are very reactive and unstable
B) are malleable and ductile
C) have high melting and boiling point
D) conduct heat and electricity
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The correct answer is A .
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Question 628: Which of the following will shift to the left from dilute tetraoxosulphate (VI) acid?
Options:
A) Lead
B) Magnesium
C) Cpper
D) Gold
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The correct answer is B .
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Question 629: Which of these require crystallization most?
Options:
A) Drug making
B) Cement making
C) Paint making
D) Perfume making
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The correct answer is A .
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Question 630: Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,
Options:
A) P will form an electrovalent bond with R
B) Q will form a covalent bond with S
C) R will form an electrovalent bond with S
D) Q will form an electrovalent bond with S
E) Q will form a covalent bond with R
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The correct answer is D .