(Solved) Likely Chemistry Objective Questions & Answers For 2021 WASSCE Candidates
Find below Some of the likely Chemistry Objective Questions & Answers For 2021 WASSCE Candidates.
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These questions are being sampled up from the previous waec past questions. Please note that the chemistry objective questions and answers below are for educational purposes only.
We are not in any way giving you these questions as Leakage paper or “Apor”. We only compile them to be used as a guide in your wassce examination.
Q1. Nitrogen in water is commonly found in the form of
(A) Nitrogen oxide
(C) Nitric oxide
Q2. Which of the following element is obtained from seaweed?
Q3. Which one of the following is found in vinegar?
A. Acetic acid
B. Propionic acid
C. Formic acid
D. Butyric acid
Q.4 The term “brown air is used for
A. Acid fumes
B. Photochemical smog
C. Sulphurous smog
D. Industrial smog
Q5. The most commonly used bleaching agent is?
A. Sodium chloride
C. Carbon dioxide
Q6. Cyanide poisoning causes death in seconds because?
A. it denatures enzymes of the heart/muscles
B. It breaks the electron transport chain
C. It causes Lysis of red blood cells
D. it causes cardiac arrest
Q7. The ore of Aluminium is?
C. Charco pyrites
Q8. Which of the following particles has dual nature particles – wave?
Q9. Ultra Purification of metal is done by?
B. Zone melting
Q10. The Radiation that can penetrate deepest in our body is?
A. UV – radiation
B. Alpha – Particle
C. b- Particle
D. Gamma – Particles.
Q11. Which of the following raw materials is used in the plastic industry?
Q12. What is the solubility of salt if 0.4g of it is obtained on evaporation of 200CM3 of its saturated solution to dryness?
A. 0.08 gdm-3
C. 8.00 gdm-3
Q13. The process of extraction of iron from its ore is?
Q14. Which of the following organic compounds can undergo both addition and substitution reactions?
Q15. An acid salt has?
A. Double anions in its aqueous solution
B. A single cation in its aqueous solution
C. Hydrogen ions in its aqueous solution
D. Hydrogen atom in its aqueous solution
Q16. QWhat is the solubility of salt if 0.4g of it is obtained on evaporation of 200CM3 of its saturated solution to dryness?
A. 0.08 gdm-3
C. 8.00 gdm-3
Q17. In which of the following compounds does hydrogen form ionic compounds?
Q18. Consider the following reaction equation : Br2 + 2K1 → 2KBr + 12 Bromine is acting as?
A. An oxidizing agent
B. A reducing agent
C. An acid
D. A base
Q19. Pure water can be made to boil at a temperature lower than 100 oC by
A. Reducing its quantity
B. Decreasing the external pressure
C. Distilling it
D. Increasing the external pressure
Q20. Cu and HNO3, are not suitable for preparing hydrogen gas because of their
A. Reactivity and oxidation respectively
B. Conductivity and corrosiveness respectively
C. Melting point and reduction respectively
Electronegativity and solubility respectively
Q21. The empirical formula of a compound containing 0.067 mol and 0.066 mol O is [Cu = 63.5, O = 16.0]
Q22. The change in an oxidation state of iron in the reaction represented by the equation below is
2FeI3 + H2S -> 2FeCI2 + 2HCI + S
A. +2 to +3
B. +3 to +2
C. 0 to +2
D. +3 to 0
Q23. Which of the following method can be used to separate blood cells from plasma?
Q24. An organic compound has the empirical formula CH2 IF ITS molar mass is 42 gmol-1 what is its molecular formula> [H = 1.0, C = 12.0]
Q25. What is the relative molecular mass of a compound which has empirical formula CH2O? [H = 1.0, C = 12.0, O = 16.0]
A . 42
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