Jamb 2020 Chemistry Past Questions And Answers
1
Which of the following types of bonding does not involve the formation of new substances?
- A. Metallic
- B. Covalent
- C. Co-ordinate
- D. Electrovalent
2
An electron can be added to a halogen atom to form a halide ion with?
- A. 8 valence electrons
- B. 7 valence electrons
- C. 2 valence electrons
- D. 3 valence electrons
3
An organic compound that does not undergo a reaction with both hydrogen cyanide and hydroxylamine can be?
- A. Alkene
- B. Alkanal
- C. Alkanone
- D. Alkanoic Acid
4
The general formula for the Alkanals is?
- A. R2CO
- B. RCHO
- C. ROH
- D. RCOOR
5
8g of CH4 occupies 11.2 at S.T.P. What volume would 22g of CH3CH2CH3 occupy under the same condition?
- A. 3.7dm^3
- B. 11.2dm^3
- C. 22.4dm^3
- D. 33dm^3
6
The substance often used for vulcanization of rubber is?
- A. Chlorine
- B. Hydrogen peroxide
- C. Sulphur
- D. Tetraoxosulphate(vi) acid
7
The electronic configuration of an element is 1S2 2S2 2P6 3S2 3P3. How many unpaired electrons are there in the element?
- A. 5
- B. 4
- C. 3
- D. 2
8
What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?
- A. 8.0g
- B. 16.0g
- C. 36.0g
- D. 72.0g
9
Deliquescent substances are also?
- A. efflorescent
- B. anhydrous
- C. hygroscopic
- D. insoluble
10
Aluminum hydroxide is used in the dyeing industry as a?
- A. Dye
- B. Dispersant
- C. Salt
- D. Mordant