Vitamin K deficiency in farm animals causes
Night blindness
Sterility in both sexes
Delayed blood clotting
Delayed ovulation
Correct answer is C
No explanation has been provided for this answer.
Elements in the same group of the periodic table have
the same number of valence electrons
the same number of electron shells
different chemical behaviour
the same atomic size
Correct answer is A
No explanation has been provided for this answer.
Which of the following statements is not true of halogens?
they exist in different physical states
they exist as diatomic molecules
their ionic radii decrease down the group
their melting and bolling points increase down the group
Correct answer is C
No explanation has been provided for this answer.
The animal by-product illustrated in the diagram above is not used in making
Fertilizer
Bone meal
Button
Leather
Correct answer is D
No explanation has been provided for this answer.
86 and 230
87 and 234
88 and 233
90 and 238
Correct answer is A
\(^{234} _{88} Q \to R + ^4 _2 He\)
\(\therefore R = ^{234 - 4} _{88 - 2} R\)
= \(^{230} _{86} R\)
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