Chemistry Past Questions And Answers
If the rate law obtained for a given reaction is rate = k(X)n (Y)m, what is the overall order of the reaction?
- A. nm
- B. n/m
- C. n + m
- D. n - m
Two atoms represented as U and U are?
- A. isomers
- B. allotropes
- C. isotopes
- D. anomers
0.07 g of a hydride of carbon occupies 56 at S.T.P when vapourised and contains 14.29% by mass of hydrogen. The formula of the hydrocarbon is (C 12, H = 1)
- A) CH4
- B) C2H2
- C) C2H4
- D) C4H8
Which of these will dissolve in HCl? Mg, Fe, Pb and Cu
- A) all the metals
- B) Mg, Fe and Cu
- C) Mg ,Fe and Pb
- D) Mg and Fe only
The molecular formula of a common organic laboratory anesthetic is
- A) CHCl3
- B) CHIsub>3
- C) CCIsub>4
- D) CHFsub>3
A property of a colloidal dispersion which a solution does not have is?
- A. the Tyndall effect
- B. homogeneity
- C. osmotic pressure
- D. surface polarity
Calculate the mass, in kilograms, of magnesium produced by the electrolysis of magnesium (II) chloride in a cell operating for 24 hours at 500 amperes.
- A. 2.7
- B. 5.4
- C. 10.8
- D. 21.7
The repeating unit in natural rubber is
- A. alkyne
- B. isoprene
- C. n-propene
- D. peoprene
The reactivity of fluorine is due to?
- A. its high electro negativity
- B. small size of fluorine atom
- C. availability of D-orbitals
- D. strong f-f bond
Given the reaction at equilibrium: N\(_2\)(g) + O\(_2\)(g) \(\iff\) 2NO(g), as the concentration of N2(g) increases, the concentration of O(g) will
- A) decrease
- B) increase
- C) remains the same
- D) vanishes