Jamb 2021 Chemistry Past Questions And Answers
1
An element having the atomic number 17 will resemble which of the following elements having atomic number as given below?
- A. 33
- B. 35
- C. 18
- D. 19
2
The fourteen elements (atomic number 90-103) after actinium are called?
- A. Actinoids
- B. Nucleotides
- C. Pre-actinum elements
- D. Atomic elements
3
A chemical process in which there is a gain of electrons is known as?
- A. Sublimation
- B. Reduction
- C. Oxidation
- D. Distillation
4
One of the following is not a physical property of monosaccharides?
- A. Monosaccharides get charred when heated
- B. Monosaccharides are water-soluble, sweet substances
- C. They are highly vital to the exploration of metals
- D. They can be reduced to sugar alcohols
5
A 'breath test' used by traffic police to check drunken driving uses?
- A. Tumeric on filter paper
- B. Silica gel coated with saliva nitrate
- C. Potassium permanganate-sulphuric acid
- D. Potassium dichromatic-sulphuric acid
6
The reactions involving simultaneous oxidation and reduction?
- A. Automatic reactions
- B. Alternate reactions
- C. Reduction agency
- D. Redox reactions
7
The enzyme that converts glucose to ethyl alcohol is?
- A. maltase
- B. zymase
- C. Diatase
- D. Invertase
8
The process or act of extracting a metal from its ore and refining it is called?
- A. Extraction
- B. Metal mining
- C. Mettallurgy
- D. Prospecting
9
The nucleus of a hydrogen atom consist of a?
- A. 1 proton only
- B. 1 proton, 2 neutron
- C. 1 neutron only
- D. 1 electron only
10
The process by which salt and water reacted in a limited way to form an acid or a base is?
- A. Neutral process
- B. Basic acidic process
- C. Hydrolysis
- D. Sublimation