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NECO SSCE Chemistry 2017 past questions and answers

This 2017 NECO SSCE Chemistry set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2017 set with instant marking.

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Sample NECO SSCE Chemistry 2017 questions

1. An atom of element X has 17 protons and 18 neutrons. What is its mass number?
  1. 17
  2. 18
  3. 35
  4. 1

Answer: C. 35

Mass number is the total number of protons and neutrons, so 17 + 18 = 35.

2. Which pair represents isotopes of the same element?
  1. Atoms with the same proton number but different neutron numbers
  2. Atoms with the same neutron number but different proton numbers
  3. Atoms with equal mass numbers but different proton numbers
  4. Atoms with different proton and neutron numbers but equal electron numbers

Answer: A. Atoms with the same proton number but different neutron numbers

Isotopes have the same proton number and different numbers of neutrons.

3. How many electrons are in the outermost shell of a neutral chlorine atom with proton number 17?
  1. 1
  2. 5
  3. 8
  4. 7

Answer: D. 7

Chlorine has the electron arrangement 2,8,7, giving seven outer-shell electrons.

4. Which element is expected to have the largest atomic radius among Li, Na, K and Rb?
  1. Li
  2. Rb
  3. Na
  4. K

Answer: B. Rb

Atomic radius increases down Group 1 as additional electron shells are occupied.

5. Which substance consists of molecules held together by covalent bonds?
  1. Magnesium oxide
  2. Sodium chloride
  3. Water
  4. Calcium fluoride

Answer: C. Water

Water is a molecular substance in which hydrogen and oxygen atoms share electrons covalently.

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