Which of the following statements about elements in Group VII is correct?
- A. Br\(_{2}\) will oxidize CI\(^{-}\)
- B. F\(_{2}\) has the least tendency to be reduced
- C. Cl\(_{2}\) will oxidize I\(^{-}\)
- D. l\(_{2}\) is a stronger oxidizing agent than F\(_{2}\)
Which of the following pairs of molecules form hydrogen bonds?
- A. C\(_{2}\)H\(_{5}\)OH and CH\(_{3}\)OH
- B. CH\(_{3}\)OH and H\(_{2}\)
- C. H\(_{2}\)S and CH\(_{4}\)
- D. NH\(_{3}\) and SO\(_{2}\)
The isotopes of neon are represented by the symbols \(^{20}\)\(_{x}\) Ne, \(^{21}\) \(_{y}\) Ne, and \(^{22}\) \(_{z}\) Ne. The relationship between x, y, and z is?
- A. x > y > z
- B. x < y < z
- C. x = y= z
- D. x < z < y
How many molecules of oxygen would occupy a volume of 2.24 cm\(^{3}\) at s.t.p?
[Molar volume at s.t.p = 22,400 cm\(^{3}\), Avogadro’s number = 6.02 x 10\(^{23}\)]
- A. 3.01 x 10\(^{20}\)
- B. 3.01 x 10\(^{27}\)
- C. 6.02 x 10\(^{19}\)
- D. 6.02 x 10\(^{27}\)
Consider the following energy profile diagram and use it to answer the question that follows
The energy profile diagram illustrates————-
- A. an endothermic reaction
- B. an exothermic reaction
- C. a spontaneous reaction
- D. a redox reaction
Consider the following energy profile diagram and use it to answer the question that follows
The enthalpy change of the reaction is————
- A. E\(_{A}\)
- B. E\(_{B}\)
- C. E\(_{C}\)
- D. E\(_{D}\)
Consider the following energy profile diagram and use it to answer the question that follows
The activation energy of the reaction is
- A. E\(_{A}\)
- B. E\(_{B}\)
- C. E\(_{C}\)
- D. E\(_{D}\)
Protons and electrons are called fundamental particles because they———-
- A. are indivisible
- B. have different charges
- C. are the lightest particles
- D. are found in all matter
The region around the nucleus where electrons can be located is called?
- A. a spectra
- B. an orbital
- C. a quanta
- D. a field
The following ions have the same electron configuration except
\(_{8}\)O, \(_{12}\)Mg, \(_{13}\)AI, \(_{17}\)CI
- A. CI\(^{-}\)
- B. O\(^{2-}\)
- C. Mg\(^{2+}\)
- D. AI\(^{3+}\)
An element, Q, contains 69% of\(^{63}\)Q and 31% of \(^{65}\)Q. What is the relative atomic mass of Q?
- A. 63.0
- B. 63.6
- C. 65.0
- D. 69.0
Potassium trioxonitrate (V) can be obtained from its solution by———-
- A. distillation
- B. evapoartion
- C. crystallization
- D. filtration
Which of the following statements is correct about ionization energy? It
- A. decreases across the periods
- B. results in the formation of an anion
- C. causes Metalic nuclei to disintegrate
- D. decreases down the group
Which of the following species has the largest ionic radius
- A. S\(^{2-}\)
- B. K\(^{+}\)
- C. CI\(^{-}\)
- D. Ca\(^{2+}\)
What is the empirical formula of a hydrocarbon containing 0.160 moles of carbon and 0.640 moles of hydrogen
- A. CH\(_{2}\)
- B. CH\(_{3}\)
- C. CH\(_{4}\)
- D. C\(_{2}\)H\(_{4}\)
What is the concentration of a solution which contains 0.28g of potassium hydroxide in 100 cm\(^{3}\) of solution [KOH = 56]
- A. 0.01 mol dm\(^{-3}\)
- B. 0.05 mol dm\(^{-3}\)
- C. 0.10 mol dm\(^{-3}\)
- D. 0.50 mol dm\(^{-3}\)
Student X titrated 25 cm\(^{3}\) of Na\(_{2}\)CO\(^{3}\) with 0.1 mol dm\(^{-3}\) HCI, using methyl orange as indicator. Student Y carried out the same exercise but used phenolphthalein as an indicator. Which of the following statements about the titration is true?
- A. hydrogen chloride gas was released in the reactions in both titrations
- B. the titer values obtained from the titration are equal
- C. the tirer value obtained by X is twice that of Y
- D. the titer value obtained by Y is twice that of X
The 25°C evaporation of a 100 cm\(^{3}\) solution of K\(_{2}\)CO\(_{3}\) to dryness gave 14g of the salt. What is the solubility of K\(_{2}\)CO\(_{3}\) at 25°C? [K\(_{2}\)CO\(_{3}\) = 138]
- A. 0.01 mol dm\(^{-3}\)
- B. 0.101 mol dm\(^{-3}\)
- C. 1.01 mol dm \(^{-3}\)
- D. 10.0 mol dm\(^{-3}\)
The Bohr model of the atom proposed the existence of?
- A. the nucleus
- B. electron shells
- C. nucleons
- D. neutrons
How many coulombs of electricity would liberate 1.08g of Ag from a solution of silver salt?
[Ag = 108.0; 1F = 96500 C]
- A. 96500 C
- B. 9650 C
- C. 965 C
- D. 9.65 C
The reactivity of fluorine is high because of
- A. its high electronegativity
- B. the small size of the fluorine atom
- C. the availability of d-orbitals
- D. the strong F-F bond