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Chemistry jamb 2021

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Question 1 of 40
1. Question
Which of the following are chemical changes?
I. cooking of food
II. digestion of food
III. freezing of water
IV. water is heated up
I and II
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I,II and III
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II and IV
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All of the above
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Question 2 of 40
2. Question
A 'breath test' used by traffic police to check drunken driving uses?
Tumeric on filter paper
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Silica gel coated with saliva nitrate
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Potassium permanganate-sulphuric acid
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Potassium dichromatic-sulphuric acid
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Question 3 of 40
3. Question
The inherited traits of an organism are controlled by?
RNA molecules
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Nucleotides
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DNA molecules
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Enzymes
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Question 4 of 40
4. Question
Oxygen is absent in?
Kerosene
Correct Incorrect Correct answer

Soil
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Glass
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Cement
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Question 5 of 40
5. Question
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
11%
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22.2%
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10%
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20%
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Question 6 of 40
6. Question
The reactivity of fluorine is due to?
its high electro negativity
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small size of fluorine atom
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availability of D-orbitals
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strong f-f bond
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Question 7 of 40
7. Question
The compounds made up of only carbon and hydrogen are called?
Carbon compounds
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Hydro carbons
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Atom
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Carbon hydrolysis
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Question 8 of 40
8. Question
220g of carbon dioxide contains ----- moles
5
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6
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3
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4
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Question 9 of 40
9. Question
The gas which causes global warming is?
O₂
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CO₂
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N₂
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He
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Question 10 of 40
10. Question
Which of the following is a non-metal that remains liquid at room temperature?
Chlorine
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Phosphorus
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Bromine
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Helium
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Question 11 of 40
11. Question
Give the common name for the following compound: (CH₃)₂CHCH₂-Br
Isobutyl bromide
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Methyl bromide
Correct Incorrect Correct answer

propyl bromide
Correct Incorrect Correct answer

Butyl bromide
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Question 12 of 40
12. Question
The mass number of a nucleus is?
Always less than its atomic number
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The sum of the number of protons and neutrons present in the nucleus
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Always more than the atomic weight
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A fraction
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Question 13 of 40
13. Question
The nucleus of a hydrogen atom consist of a?
1 proton only
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1 proton, 2 neutron
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1 neutron only
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1 electron only
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Question 14 of 40
14. Question
A binary compound of oxygen with another element is referred to as?
Oxide
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Element
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Carbon
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Nitrogen
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Question 15 of 40
15. Question
The molar enthalpy change accompanying the removal of an electron from a gas phase atom or
ion in its ground state is called?
Electron gain enthalpy
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Ionization enthalpy
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Enthalpy change
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Enthalpic gas remover
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Question 16 of 40
16. Question
A chemical process in which there is a gain of electrons is known as?
Sublimation
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Reduction
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Oxidation
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Distillation
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Question 17 of 40
17. Question
The enzyme that converts glucose to ethyl alcohol is?
Maltase
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Zymase
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Diatase
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Invertase
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Question 18 of 40
18. Question
The nucleus of an atom consists of?
Electrons and neutrons
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Electrons and protons
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Protons and neutrons
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None of the above
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Question 19 of 40
19. Question
The fourteen elements (atomic number 90-103) after actinium are called?
Actinoids
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Nucleotides
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Pre-actinum elements
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Atomic element
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Question 20 of 40
20. Question
Which one of the following is not a mixture?
Air
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Mecury
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Milk
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Cement
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Question 21 of 40
21. Question
The only metal that is anti-bacterial is?
Iron
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Sodium
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Aluminum
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Copper
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Question 22 of 40
22. Question
The scientist who stated that matter can be converted into energy is?
Boyle
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Lavoiser
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Avogadro
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Einstein
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Question 23 of 40
23. Question
What is the chemical name for the compound CuCO₃?
Copper (iii) carbonate
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Copper (ii) carbonate
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Copper (i) carbonate
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Copper
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Question 24 of 40
24. Question
In troposphere, the two types of pollutants are?
Gaseous and particulate pollutants
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Carbon and metallic pollutants
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Natural and man-made pollutants
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Sulphuric and nitrogenous pollutants
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Question 25 of 40
25. Question
One of the following is not a physical property of monosaccharides?
Monosaccharides get charred when heated
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Monosaccharides are water-soluble, sweet substances
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They are highly vital to the exploration of metals
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They can be reduced to sugar alcohols
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Question 26 of 40
26. Question
Soaps clean surfaces on the principle based on
viscosity
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floatation
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elasticity
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Surface tension
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Question 27 of 40
27. Question
Which of the following is a form of calcium carbonate?
I. limestone
II. marble
III. chalk
Iv. egg-shells
I only
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I, II and IV
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I and II only
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I, II, III, and IV
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Question 28 of 40
28. Question
The most abundant rare gas in the atmosphere is?
He
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Ne
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Ar
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Xe
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Question 29 of 40
29. Question
The heat required to raise the temperature of the body by 1k is called?
Specific capacity
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Thermal capacity
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Water equivalent
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None of the above
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Question 30 of 40
30. Question
The reactions involving simultaneous oxidation and reduction?
Automatic reactions
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Alternate reactions
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Reduction agency
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Redox reactions
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Question 31 of 40
31. Question
The maximum electron in N shell is?
2
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8
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18
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32
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Question 32 of 40
32. Question
The metal used to recover copper from a solution of copper sulphate is
Na
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Ag
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Hg
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Fe
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Question 33 of 40
33. Question
Neutrons were discovered by?
James Chadwick
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Ernest Rutherford
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J.J Thompson
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John Dalton
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Question 34 of 40
34. Question
An element having the atomic number 17 will resemble which of the following elements having
atomic number as given below?
33
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35
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18
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19
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Question 35 of 40
35. Question
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?
Sublimation
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Evaporation
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Diffusion
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Radiation
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Question 36 of 40
36. Question
The mass of one Avogadro number of helium atoms is?
1.00gram
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4.00gram
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8.00gram
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6.00gram
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Question 37 of 40
37. Question
The process or act of extracting a metal from its ore and refining it is called?
Extraction
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Metal mining
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Metallurgy
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Prospecting
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Question 38 of 40
38. Question
The atomic weight of nitrogen is?
10
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12
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14
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16
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Question 39 of 40
39. Question
What is the IUPAC name for the following compound? HC≡CCH₃
Acetylene
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Methyl acetylene
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Butanol
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Decanoic acid
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Question 40 of 40
40. Question
The process by which salt and water reacted in a limited way to form an acid or a base is?
Neutral process
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Basic acidic process
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Hydrolysis
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Sublimation
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Chemistry jamb 2021

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