If a metal R forms a compound with the formula R(NO3)2 , the formula of its tetraoxosulphate (IV) is
- A. R(SO4)2
- B. RSO4
- C. R2SO4
- D. R2(SO4)3
An element Y has the electronic configuration 1s22s22p6623p4. To what period does it belong in the periodic table?
- A. 3
- B. 4
- C. 5
- D. 6
The conclusion from Rutherford’s alpha-scattering experiment is that
- A. atoms are mostly empty space with a small nucleus
- B. emissions from radioactive substances consist of three main components
- C. there is nuclear pull on orbital electrons
- D. electrons are deflected by both magnetic and electric fields
Which of the following elements has a ground state electronic configuration with an incomplete penultimate shell?
- A. Iron
- B. Sodium
- C. Aluminium
- D. Calcium
A hydrogen atom which has lost an electron contains
- A. one proton only
- B. one neutron only
- C. one proton and one neutron
- D. one proton, one electronic and one neutron
The atomic number of chlorine is 17. What is the number of electrons in a chloride ion?
- A. 16
- B. 17
- C. 18
- D. 19
The atom of an element X is represented as \(^y_z X\). The basic chemical properties of X depend on the value of
- A. Y
- B. Z
- C. Y - Z
- D. Z - Y
If the relative molecular mass of an element is not a whole number, it can be deduced that the element is
- A. naturally radioactive
- B. abundant in nature
- C. a transition metal
- D. an isotopic mixture
Which of the following statements about soapless detergents is correct? They
- A. lather readily with hard water
- B. increase the surface tension of water
- C. cause hydrolysis of salts in water
- D. from a curdy precipitate with soft water
The following compounds are hydrocarbons except
- A. methylpropanoate
- B. 2-methylbutane
- C. benzene
- D. cyclohexane
When alkynes are hydrogenated completely, they produce compounds with the general molecular formula
- A. C nH n
- B. C nH 2n+2
- C. CnH 2n
- D. CnH2n-2
Which of the following compounds can be represented by the molecular formula C2H6O?
- A. Propanel
- B. Ethanol
- C. Methanoic acid
- D. Glucose
Which of the following processes takes place during the production of margarine from vegetable oils?
- A. Esterification
- B. Hydrolysis
- C. Hydrogenation
- D. Saponification
When concentrated sodium chloride solution is electrolysed using inert electrodes the products are?
- A. oxygen and hydrogen
- B. hydrogen and oxygen
- C. sodium and oxygen
- D. soduim hydroxide, hydrogen and chlorine
If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged is the one that has the
- A. smaller mass
- B. lower electrical charge
- C. greater stability in solution
- D. stronger tendency to accept electrons
Which of the following ions require the largest quantity of electricity for discharge at an electrode?
- A. 2.0 mole of Q 3+
- B. 2.5 mole of R2+
- C. 4.0 mole of Y-
- D. 3.0 mole of T-
Consider the following equation; Cr2O7(aq)2- + 14H+(aq) + 6e– → 2Cr3+(aq) + 7H2O(I). The oxidation number of chromium changes from
- A. -2 to + 3
- B. - 2 to + 6
- C. + 6 to + 3
- D. + 7 to + 6
The atomic number of chlorine is 17. What is the number of electrons in a chloride ion?
- A. 16
- B. 17
- C. 18
- D. 19
If the relative molecular mass of an element is not a whole number, it can be deduced that the element is
- A. naturally radioactive
- B. abundant in nature
- C. a transition metal
- D. an isotopic mixture