Which of the following is TRUE of a catalyst?
I. it alters the activation energy of a reaction II. it is effective in a reaction but cannot initiate a reaction III, it affects the equilibrium of a reversible reaction IV. it affects the overall reaction A. I and II only B. I, II and III only C. II and III only D....
The high boiling point of hydrogen fluoride can be explained in terms of?
A. covalent bonds. B. dative bonds. C. dipole-dipole bonds. D. electrovalent (ionic) bonds E. hydrogen bonds. Correct Answer: Option E – hydrogen bonds.
What is the ratio of the rate of diffusion of carbon(IV)oxide to that of propane; under the same conditions? [H = 1; C= 12; 0= 161
A. 1:01 B. 1:01 C. 2:01 D. 2:03 E. 3:01 Correct Answer: Option A – 1:01
The maximum number of electrons that can occupy the shell having a principal quantum number of 3 is?
A. 3 B. 9 C. 10 D. 18 E. 32 Correct Answer: Option D = 18
On exposure to hydrogen sulphide; moist lead (II) ethanoate paper turns
A. black B. blue C. green D. white E. yellow Correct Answer: Option A – blackProducts
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