CHEMISTRY DRILL IV

Periodic Table Of  Elements.

          To Round off our study of atoms, we bring even deeper questions  your way this week. Please re-visit the topic : Atomic structure befoe attempting this drill. Kindly read our updated rules before participating

1.       The Avogadro number of 24g of magnesium is the same as that of? (a) 1g of hydrogen molecules (b) 16g of oxygen molecules (c) 32g of oxygen molecules (d) 35.5g of chlorine molecules 

2.              

                                P              Q             R             S

Proton                    13           16           17           19

Electron 13           16           17           19

Neutron 14           16           35           20

Which of the four atoms P, Q, R and S in the above date can be described by the following properties: Relative atomic mass is greater than 30 but less than 40; it has an odd atomic number and forms a unipositive ion in solution?

(a) P (b) Q (c) R (d) S

3.       The nucleus of the isotope tritium, contains? (a) Two neutrons with no protons (b) One electron and one proton (c) Two neutrons and one proton (d) Two neutrons, one proton and one electron

4.       How many moles of oxygen molecules would be produced by the decomposition of 2.5 moles of potassium tri oxo chlorate (V)? (a) 2.50 (b) 3.50 (c) 3.75 (d) 7.50

5.       A balanced chemical equation obeys the law of? (a) Conservation of mass (b) Definite proportions (c) Multiple proportions (d) Conservation of energy

6.       Two atoms represented as ²³⁵₉₂U and ²³⁸₉₂U are? (a) Isomers (b) Allotropes (c) Isotopes (d) Anomers

7.       In the oil drop experiment, Millikan determined the? (a) Charge to mass ratio of the electron (b) Mass of the electron (c) Charge of the electron (d) Mass of the proton

8.       The stability of ionic solids is generally due to the? (a) Negative electron affinity of most atoms (b) Crystal lattice forces (c) Electron pair sharing (d) Positive ionisation potentials

9.       Which of the following statements is FALSE about isotopes of the same element? (a) The have the same number of electrons in their outermost shells (b) They have different atomic masses (c) They have the same atomic number and the same number of electrons  (d) They have the same atomic number but different number of electrons

10.    A gaseous metallic chloride MCl_x consists of 20.22% of M by mass. The formula of the chloride is? (a) Mcl (b) MCl₂ (c) MCl₃ (d) M₂Cl₆ [M=27, Cl=35.5]