Chemistry GK Practice Question and Answer

Q:

Which of the following elements is NOT a component of baking soda?

241 1

  • 1
    Hydrogen
    Correct
    Wrong
  • 2
    Calcium
    Correct
    Wrong
  • 3
    Sodium
    Correct
    Wrong
  • 4
    Oxygen
    Correct
    Wrong
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Answer : 4. "Oxygen"
Explanation :

1. Which of the following calcium elements is not a component of baking soda?

2. The chemical formula of baking soda is NaHCO3, which is composed of four elements sodium, hydrogen, carbon and oxygen.

3. Baking soda is an alkaline substance used as a leavening agent in baking.

Q:

Which law was studied in the year 1787, in which it was said that the volume of a gas increases with its absolute temperature and if its absolute temperature decreases, then its volume will decrease?

250 0

  • 1
    Boyle’s law 
    Correct
    Wrong
  • 2
    Dalton’s law 
    Correct
    Wrong
  • 3
    Avogadro’s law 
    Correct
    Wrong
  • 4
    Charles's law
    Correct
    Wrong
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Answer : 4. "Charles's law"
Explanation :

1. Charles's law (also known as volume law) is an experimental gas law.

2. The volume of a gas increases with its absolute temperature and as its absolute temperature decreases its volume also decreases.

3. Charles's law was studied in the year 1787.

Q:

Identify a class of compounds that has a functional group –OH.

222 0

  • 1
    Alcohol
    Correct
    Wrong
  • 2
    Ethane
    Correct
    Wrong
  • 3
    Ketone
    Correct
    Wrong
  • 4
    Aldehyde
    Correct
    Wrong
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Answer : 1. "Alcohol"
Explanation :

1. That class of compounds, which contain a functional group –OH, is called alcohol.

2. Alcohols contain a hydrogen atom and a hydroxyl group (-OH) along with a carbon atom.

3. The hydroxyl group is a polar group, which makes the alcohol soluble in water.

Q:

Hydrogen resembles the properties of which two groups of the periodic table?

244 0

  • 1
    Group 2 and Group 17
    Correct
    Wrong
  • 2
    Group 1 and Group 3
    Correct
    Wrong
  • 3
    Group 1 and Group 17
    Correct
    Wrong
  • 4
    Group 2 and Group 4
    Correct
    Wrong
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Answer : 3. "Group 1 and Group 17"
Explanation :

1. Hydrogen matches the properties of the first group and seventh group of the periodic table.

2. Following is some additional information about the properties of hydrogen.

- Hydrogen is a highly flammable gas.

-Hydrogen is a major component of water.

- Hydrogen can be used as fuel.

Hydrogen is used in the chemical industry to make many types of products.

Q:

In 1845, which German chemist published a method for the synthesis of acetic acid, a natural product containing two carbon atoms?

264 0

  • 1
    Friedrich Wohler
    Correct
    Wrong
  • 2
    Marcellin Berthelot
    Correct
    Wrong
  • 3
    Joseph Gay-Lussac
    Correct
    Wrong
  • 4
    Hermann Kolbe
    Correct
    Wrong
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Answer : 4. "Hermann Kolbe"
Explanation :

1. In 1845, the German chemist who published a method for the synthesis of 'acetic acid', a natural product containing two carbon atoms, was Hermann Kolbe.

2. He created carbon disulfide with chlorine, and the end result was carbon tetrachloride.

Q:

Which of the following will be a negative ion?

271 0

  • 1
    If it has more electrons than protons
    Correct
    Wrong
  • 2
    If it has more electrons than neutrons
    Correct
    Wrong
  • 3
    If it has more protons than electrons
    Correct
    Wrong
  • 4
    If it has more protons than neutrons
    Correct
    Wrong
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Answer : 2. "If it has more electrons than neutrons"
Explanation :

If an atom has more electrons than protons, it is a negative ion or anion. If it has more protons than electrons, it is a positive ion.

Q:

What do you call the drugs that bind to the receptor site and inhibit its natural function?

206 0

  • 1
    Antidepressants
    Correct
    Wrong
  • 2
    Agonist
    Correct
    Wrong
  • 3
    Antagonists
    Correct
    Wrong
  • 4
    Depressants
    Correct
    Wrong
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Answer : 3. "Antagonists"
Explanation :

1. Name: Antagonist

2. Mechanism of action: By binding to the surface of the receptor, they cause opposition to the natural function.

Q:

Burning of coal is a ______ reaction.

158 0

  • 1
    displacement
    Correct
    Wrong
  • 2
    decomposition
    Correct
    Wrong
  • 3
    combination
    Correct
    Wrong
  • 4
    double displacement
    Correct
    Wrong
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Answer : 3. "combination"
Explanation :

1. The burning of coal is an example of a combination reaction (a combination).

2. When two or more elements combine to form a compound, it is called a combination reaction.

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