Chemistry Past Questions And Answers
The monomer of nylon is
- A) Hydroxybenzene
- B) Hexanedioic acid
- C) Benzene -1,-4-dicarboxylic acid
- D) Ethane-1,2-diol
The principal constituents of natural gas is
- A) methane
- B) ethane
- C) propane
- D) butane
Alkenes undergo the following reactions except
- A. addition
- B. hydration
- C. polymerization
- D. substitution
Which of the following compounds has coordinate bonds in its structure?
- A. Al2Cl6
- B. MgCl2
- C. AgCl
- D. NaCl
When ΔH is negative, a reaction is said to be
- A. ionic
- B. reversible
- C. exothermic
- D. endothermic
When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called
- A) electrovalent bond
- B) co-ordinate bond
- C) ionic bond
- D) covalent bond
Which of the following statement is correct?
- A. Addition reactions occur between alkanes and chlorine.
- B. Butane has a lower boiling point than propane.
- C. Pentane has five isomers.
- D. An alkane with 49 carbon atoms contains 100 hydrogen atoms
The reaction, Y \(\rightarrow\) Product is of first order with the initial concentration of Y = 3.55 × 10?3 moldm3 and the rate constant of 5.25 × 10?3s?1. What is the half-life of the reaction?
- A) 350s
- B) 215s
- C) 132s
- D) 615s
When a salt is added to its saturated solution, the salt
- A. dissolves and the solution becomes super saturated
- B. dissolves and the solution becomes unsaturated
- C. precipitates and the solution remains unchanged
- D. dissolves and crystals are formed
The reduction potential of two electrodes are
\(X^{2+} + 2e^- \rightarrow X, E^0 = 0.042V\)
\(Y^+ + e^- \rightarrow Y, E^0 = 0.012V\)
Calculate the free energy change for the cell that is made up of the electrodes [F = 96500 Coulomb mol?1]
- A) 4.20kJ
- B) 5.79kJ
- C) 6.86kJ
- D) 10.55kJ