Which of the following statements about a molar solution is correct? it
- A. is a supersaturated solution
- B. cannot dissolve more of the solute at that temperature
- C. contains any amount of solute in a given volume of solution
- D. contains one mole of the solute in 1 dm3 of solution
The number of atoms in one mole of a substance is equal to the
- A. mass number
- B. oxidation number
- C. atomic number
- D. avogadro number
What is the amount of magnesium that would contain 1.20 x 1024 particles? [Mg = 24, Avogadro’s constant = 6.02 x 1023]
- A. 0.5 moles
- B. 2.0 moles
- C. 12.0 moles
- D. 24.0 moles
Consider the reaction represented by the following equation: xKMnO 4(aq) + ySO2(g) + zH2O(I) → K 2SO4(AQ) + 2MnSO4(aq) + 2H2SO x,y and z are respectively
- A. 2,5 and 2
- B. 2,2 and 5
- C. 5, 1 and 2
- D. 1, 5 and 2
The volume occupied by 17g of H2S at s.t.p. is [H = 1.00, S = 32.0, Molar volume = 22.4 dm3]
- A. 11.2dm 3
- B. 17.0 dm3
- C. 34.0dm 3
- D. 44.8dm 3
Which of the following statements about displacement reaction is correct?
- A. A more electropositive element displaces a less electroposive one
- B. A less electropositive element displaces a more electropositive one
- C. The position of elements in the reactivity series has no effect on the reaction
- D. it only occurs when the reaction is at equilibrium
In metallic colids, the forces of attraction are between the mobile valence electrons and
- A. atoms
- B. neutrons
- C. the negative ions
- D. positively charged nuclei
When element 20A combines with element 8Y,
- A. a covalent compound, AY is formed
- B. an ionic compound AY is formed
- C. an ionic compound, A2Y is formed
- D. a covalent compound, AY2 is formed
The bond formed when two electrons that are shared between two atoms are donated by only one of the atoms is
- A. covalent
- B. dative
- C. ionic
- D. metalic
Which of the following elements can conveniently be placed in two groups in the periodic table ?
- A. Carbon
- B. Copper
- C. Hydrogen
- D. Oxygen
Chlorine, bromine and iodine belong to the same group and
- A. are gaseous at room temperature.
- B. form white precipitate with AgNO3(aq)
- C. react violently with hydrogen without heating
- D. react with alkali
Which of the following arrangements is in order of increasing metallic property?
- A. Li < Na< k
- B. Na < Li < K
- C. K
- D. K < Li < Na
Which of the following hydrohalic acids is the weakest?
- A. HBr
- B. HCI
- C. HF
- D. HI
The energy change that accompanies the addition of an electron to an isolated gaseous atom is
- A. bond energy
- B. electronegativity
- C. electron affinity
- D. ionization energy
Which of the following elements would produce coloured ions in aqueous solution?
- A. Calcium
- B. lron
- C. Magnesium
- D. Sodium
Rare gases are stable because they
- A. contain equal number of protons and neutrons
- B. contain more electrons than protons
- C. are chemically active
- D. have octet structure
An element with the electron configuration of 1s 22s 22p 6 would have a combining power of
- A. o
- B. 2
- C. 6
- D. 8
Which of the following ions has the electron configuration 2,8,8?
- A. Na+
- B. Mg2+
- C. F-
- D. CI-
What type of reaction is represented by the following equation?\(\frac{2}{1}\)D\(\frac{3}{1}\)H → \(\frac{4}{4}\)He + \(\frac{1}{0}\)n + energy
- A. Nuclear fission
- B. Nuclar fusion
- C. Radioactive decay
- D. Spontaneous decay
Which of the following electrons configurations correctly represents an inert element?
- A. 1s22s22p4
- B. 1s22s22p63s2
- C. 1s22s22p63s23p4
- D. 1s22s22p6