## WAEC 2005 : Chemistry

1The electronic configuration of an element X is 1s22s 22s63p 2 3p4. It can be deduced that X

• A. Belongs to group 6 of the Periodic Table
• B. Belongs to group IV of the Periodic Table
• C. has 3 unpaired electrons in its atom
• D. has relative molecular mass of 16

2What is the mass number of an element having 20 neutrons, 15 protons and 15 electrons

• A. 15
• B. 30
• C. 35
• D. 50

3Which of the following sets of elements are arranged in order of decreasing atomic size in the Periodic Table

• A. 6C, 4Be, 7N,8 O
• B. 4Be,6 C,7 N,8 O
• C. 8O, 7 N, 6C, 4Be
• D. 7N, 8O, 6C,4BeBe

4Which of the following changes is characteristic of an alpha-particle emission

• A. the nucleus loses two protons and two neutrons
• B. a proton combines with an electron giving off heat
• C. the nucleus splits into two equal parts
• D. four neutrons are lost

5An element X has an atomic number of 16. What is its most likely oxidation state in its binary compounds

• A. -3
• B. -2
• C. 2
• D. 4

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