Chemistry Quiz Questions And Answers For Class 12

30 Questions | By Themes | Updated: May 30, 2022 | Attempts: 2287

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Hey, are you looking for an online test of chemistry quiz questions and answers for class 12th students? If so, you have reached the right place. The test contains questions related to every chapter of grade 12 chemistry to make students practice better than ever. From containing questions related to elements and compounds to magnets and paramagnetic substances, the quiz is overall reading material for a student who is looking for a test to examine their knowledge. So, take up this quiz and check how prepared you are for your upcoming exams.

Questions and Answers

1.

The ion which has the highest magnetic moment is………
- A.
  
  Sc⁺³
- B.
  
  Fe⁺³
- C.
  
  V⁺²
- D.
  
  Cr⁺⁴
2.

The following compounds are paramagnetic and colored, except…..
- A.
  
  FeCl₃
- B.
  
  CuCl₂
- C.
  
  ScCl₃
- D.
  
  CoCl₂
3.

The following figure represents a chemical reaction, (∆H) value for this reaction is……….. [ +50 /-50 ] The activation energy before using catalyst is…….. [ +150 / +100] The activation energy after using catalyst is …….. [ +100 /+50]
- A.
  
  -50,+100,+50
- B.
  
  +50,+100,+50
- C.
  
  -50,+150,+50
- D.
  
  +50,+100,+100
4.

In the following figure, the substance that causes the greatest movement in the indicator of the sensitive balance when put in the tube is…..
- A.
  
  V²⁺
- B.
  
  Fe²⁺
- C.
  
  Mn²⁺
- D.
  
  Cr³⁺
5.

The following elements are arranged according to chemical activity Iron Copper Silver Platinum If you knew that the element scandium replaces hydrogen of water vigorously, what is its occupying place in the previous arrangement?
- A.
  
  After copper
- B.
  
  Between iron and copper
- C.
  
  After silver
- D.
  
  Before iron
6.
1. If you have two solutions, one of them contains V³⁺ions and the other contains Zn²⁺ ions. Which of those solutions is colorless? [ V³⁺- Zn²⁺]
And the scientific reason behind this is that….... [all of its d-electrons are unpaired-all of its d-electrons are paired]
- A.
  
  Zn²⁺, all of its d-electrons are paired
- B.
  
  V³⁺ ,all of its d-electrons are unpaired
- C.
  
  Zn²⁺, all of its d-electrons are unpaired
- D.
  
  V³⁺ ,all of its d-electrons are paired
7.

Choose a word to illustrate the following phrase: Two elements of the first transition series each having only one oxidation state.
- A.
  
  Scandium and copper
- B.
  
  Scandium and zinc
- C.
  
  Zinc and nickel
- D.
  
  Copper and chromium
8.

When d-sublevel contains eight electrons, the number of half-filled orbitals equals….....
- A.
  
  1
- B.
  
  2
- C.
  
  3
- D.
  
  4
9.

The compound FeCl₂ is…….
- A.
  
  Paramagnetic and colored
- B.
  
  Diamagnetic and colorless
- C.
  
  Paramagnetic and colorless
- D.
  
  Diamagnetic and colored
10.

What is the name of the element or compound used in detecting of some industrials flaws as cracks in welded locations?
- A.
  
  Copper
- B.
  
  Vanadium pentoxide
- C.
  
  Cobalt-60
- D.
  
  Copper (II) sulphate
11.

The element where the d or f sublevel is completely fille with electrons either in the atomic state or oxidation state is…..
- A.
  
  Main transition element
- B.
  
  Non- transition element
- C.
  
  Inner transition element
- D.
  
  None of the above
12.

An element belongs to the first transition series, it’s magnetic moment in X₂O₃ compound equals 3, deduce the atomic number of this element
- A.
  
  21
- B.
  
  22
- C.
  
  23
- D.
  
  24
- E.
  
  25
- F.
  
  26
13.

What is the name of the alloy used in avoiding corrosion and rusting of soft drinks cans?
- A.
  
  Ferromanganese alloy
- B.
  
  Ferrochrome alloy
- C.
  
  Aluminum-manganese alloy
- D.
  
  Nickel-chrome alloy
14.

The following is a modified true / false question. In it, you must decide if each individual statement is true (T) or false (F). If both are true, then you must also decide if the second statement is a correct explanation (CE) of the first statement. Examples: EX.1: H₂SO₄ is a strong acid because contains H₂SO₄ sulphur. EX.2: An atom of oxygen is electrically neutral because an oxygen atom contains equal number of protons &electrons. Answers: EX.1: T,T EX.2: T, T, C.E Question: When a chlorine atom gains an electron, it becomes a positively charged ion. Because A neutral atoms has equal numbers of protons and electrons.
- A.
  
  T,T
- B.
  
  T,T,C.E
- C.
  
  T,F
- D.
  
  F,T
- E.
  
  F,F
15.

Determine the ions which can’t be produced by normal chemical reactions from the following: 1) Sc²⁺ 2)Mn⁴⁺3) Co²⁺ 4)Zn+
- A.
  
  1 and 2
- B.
  
  1 and 3
- C.
  
  2 and 3
- D.
  
  3 and 4
- E.
  
  1 and 4
16.

Magnetic moment is…..
- A.
  
  The tendency of an element to be attracted to an external magnet
- B.
  
  Determined by the number of unpaired electrons in the 3d sublevel
- C.
  
  Determined by the number of paired electrons in the 3d sublevel
- D.
  
  A&b
- E.
  
  A&c
17.

Manganese (II) ion is …….. oxidized to manganese (III) ion
- A.
  
  Easily
- B.
  
  Difficultly
- C.
  
  Not possible
- D.
  
  No correct answer
18.

You have similar rods of the following elements Ti, Ni, Cu, Fe Which has the highest ability to conduct electricity?
- A.
  
  Ti
- B.
  
  Ni
- C.
  
  Cu
- D.
  
  Fe
19.

All of the transition metals are characterized by……….
- A.
  
  Several oxidation states
- B.
  
  Forming colored solutions
- C.
  
  Electric conductivity
- D.
  
  Ability to be magnetized
20.

What is the name of the compound or element used in determining the percentage of sugar in urine of diabetic patients?
- A.
  
  Iron
- B.
  
  Vanadium pentoxide
- C.
  
  Manganese
- D.
  
  Copper(II) sulphate
21.

…… is a transition element in the first transition series that has an oxidation number higher than its vertical group number
- A.
  
  Copper
- B.
  
  Iron
- C.
  
  Cobalt
- D.
  
  Scandium
- E.
  
  Silver
22.

What is the name of the element or compound used in getting pure drinking water in desert locations?
- A.
  
  Cobalt
- B.
  
  Vanadium pentoxide
- C.
  
  Nickel
- D.
  
  Copper(II) sulphate
- E.
  
  Titanium dioxide
- F.
  
  Titanium dioxide
23.

Why is it easy to convert titanium(III) ion to titanium (IV) ion? Because titanium (III) ion is…….
- A.
  
  Easily oxidized by losing electrons
- B.
  
  Easily oxidized by gaining electrons
- C.
  
  Easily reduced by losing electrons
- D.
  
  Easily reduced by gaining electrons
24.

The process used to convert water gas to liquid fuel is…
- A.
  
  Contact process
- B.
  
  Fischer-Tropsch method
- C.
  
  Haber-Bosch method
- D.
  
  Hydrogenation
25.

Regarding the elements of the first transition, all of the following is correct except….
- A.
  
  The atomic mass increases with the increase in atomic number
- B.
  
  The density increases as the atomic mass increases
- C.
  
  As the atomic number increases it is difficult to be oxidized
- D.
  
  The ionization energy decreases with the increase in atomic number