2021 Chemistry

1. Give the common name for the following compound (CH₃)₂CH CH₂-Br

• A. Isobutyl bromide
• B. Methyl bromide
• C. propyl bromide
• D. Butyl bromide

2. The enzyme that converts glucose to ethyl alcohol is?

• A. maltase
• B. zymase
• C. Diatase
• D. Invertase

3. The scientist who stated that matter can be converted into energy is? 

• A. Boyle
• B. Lavoiser
• C. Avogadro
• D. Einstein

4. What is the IUPAC name for the following compound? HC≡CCH₃

• A. Acetylene
• B. Methyl acetylene
• C. Butanol
• D. Decanoic acid

5. What is the chemical name for the compound CuCO₃?

• A. Copper (iii) carbonate
• B. Copper (ii) carbonate
• C. Copper (i) carbonate
• D. Copper

6. 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

7. Which one of the following is not a mixture?

• A. Air
• B. Mercury
• C. Milk
• D. Cement

8. Which of the following is a non-metal that remains liquid at room temperature?

• A. Chlorine
• B. Phosphorus
• C. Bromine
• D. Helium

9. Which of the following are chemical changes? 
10. cooking of food
    II. digestion of food
    III. freezing of water
    IV. water is heated up

• A. I and II
• B. I, II, and III
• C. III and IV
• D. all of the above

10. The atomic weight of nitrogen is?

• A. 10
• B. 12
• C. 14
• D. 16

11. The gas which causes global warming is?

• A. O₂
• B. CO₂
• C. N₂
• D. He

12. Oxygen is absent in?

• A. Kerosene
• B. Soil
• C. Glass
• D. Cement

13. A sample of any of the following substances disappears after some time when exposed to air like camphor, naphthalene, or dry ice. This phenomenon is called?

• A. Sublimation
• B. Evaporation
• C. Diffusion
• D. Radiation

14. The maximum electron in N shell is?

• A. 2
• B. 8
• C. 18
• D. 32

15. Neutrons were discovered by?

• A. James Chadwick
• B. Ernest Rutherford
• C. J.J Thompson
• D. John Dalton

16. Which of the following is a form of calcium carbonate?
17. limestone
    II. marble
    III. chalk
    Iv. egg-shells

• A. I only
• B. I, II and IV
• C. I and II only
• D. I, II, III, and IV

17. Soaps clean surfaces on the principle based on?

• A. viscosity
• B. floatation
• C. elasticity
• D. surface tension

18. The reactivity of fluorine is due to?

• A. its high electro negativity
• B. small size of fluorine atom
• C. availability of D-orbitals
• D. strong f-f bond

19. The mass number of a nucleus is?

• A. Always less than its atomic number
• B. The sum of the number of protons and neutrons present in the nucleus
• C. Always more than the atomic weight
• D. A fraction

20. The mass of one Avogadro number of helium atoms is?

• A. 1.00gram
• B. 4.00gram
• C. 8.00gram
• D. 6.00gram

21. 220g of carbon dioxide contains —– moles

• A. 5
• B. 6
• C. 3
• D. 4

22. The inherited traits of an organism are controlled by?

• A. RNA molecules
• B. Nucleotides
• C. DNA molecules
• D. Enzymes

23. The most abundant rare gas in the atmosphere is?

• A. He
• B. Ne
• C. Ar
• D. Xe

24. The heat required to raise the temperature of the body by 1k is called?

• A. Specific heat
• B. Thermal capacity
• C. Water equivalent
• D. None of the above

25. 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

26. The metal used to recover copper from a solution of copper sulphate is?

• A. Na
• B. Ag
• C. Hg
• D. Fe

27. The nucleus of an atom consists of?

• A. Electrons and neutrons
• B. Electrons and protons
• C. Protons and neutrons
• D. None of the above

28. A solution contains 20g of solute in 180g of solvent. If the solvent is water, what is the concentration of the solution in terms of mass by mass percentage

• A. 11.%
• B. 22.2%
• C. 10%
• D. 20%

29. The only metal that is anti-bacterial is?

• A. Iron
• B. Sodium
• C. Alluminium
• D. Copper

30. 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

31. A chemical process in which there is a gain of electrons is known as?

• A. Sublimation
• B. Reduction
• C. Oxidation
• D. Distillation

32. The reactions involving simultaneous oxidation and reduction?

• A. Automatic reactions
• B. Alternate reactions
• C. Reduction agency
• D. Redox reactions

33. A binary compound of oxygen with another element is referred to as?

• A. Oxide
• B. Element
• C. Carbon
• D. Nitrogen

34. 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

35. The compounds made up of only carbon and hydrogen are called?

• A. Carbon compounds
• B. Hydrocarbons
• C. Atoms
• D. Carbon hydrolysis

36. 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

37. In troposphere, the two types of pollutants are?

• A. Gaseous and particulate pollutants
• B. Carbon and metallic pollutants
• C. Natural and man-made pollutants
• D. Sulphuric and nitrogenous pollutants

38. The molar enthalpy change accompanying the removal of an electron from a gas phase atom or ion in its ground state is called?

• A. Electron gain enthalpy
• B. Ionization enthalpy
• C. Enthalpy change
• D. Enthalpic gas removal

39. The fourteen elements (atomic number 90-103) after actinium are called? 

• A. Actinoids
• B. Nucleotides
• C. Pre-actinum elements
• D. Atomic elements

40. 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