Chemistry Practice Question and Answer

Q:

Milk is a natural 

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  • 1
    Solution
    Correct
    Wrong
  • 2
    Mixture
    Correct
    Wrong
  • 3
    Suspension
    Correct
    Wrong
  • 4
    Emulsion
    Correct
    Wrong
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Answer : 4. "Emulsion "

Q:

Which gas is mostly present in Venus atmosphere?

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  • 1
    Hydrogen
    Correct
    Wrong
  • 2
    Carbon Dioxide
    Correct
    Wrong
  • 3
    Helium
    Correct
    Wrong
  • 4
    Nitrogen
    Correct
    Wrong
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Answer : 2. "Carbon Dioxide"

Q: Which two atoms form an ionic bond? 1123 0

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Answer :
Explanation :

Ionic bonding is a type of chemical bond in which valence electrons are lost from one atom and gained by another.. This bond generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.   Example :: One example of an ionic bond is the formation of sodium fluoride, NaF, from a sodium atom and a fluorine atom. In this reaction, the sodium atom loses its single valence electron to the fluorine atom, which has just enough space to accept it. The ions produced are oppositely charged and are attracted to one another due to electrostatic forces.

Q:

What is the main raw material in glass?

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  • 1
    Copper
    Correct
    Wrong
  • 2
    Zink
    Correct
    Wrong
  • 3
    Cadmium
    Correct
    Wrong
  • 4
    Silica
    Correct
    Wrong
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Answer : 4. "Silica"

Q:

Percentage of lead in lead pencil is: 

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  • 1
    zero
    Correct
    Wrong
  • 2
    20
    Correct
    Wrong
  • 3
    80
    Correct
    Wrong
  • 4
    7
    Correct
    Wrong
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Answer : 1. "zero "

Q: What is the systematic name of PbO? 1123 0

  • 1
    Plumbic oxide
    Correct
    Wrong
  • 2
    Lead oxide
    Correct
    Wrong
  • 3
    Lead(II) oxide
    Correct
    Wrong
  • 4
    All of the above
    Correct
    Wrong
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Answer : 3. "Lead(II) oxide"
Explanation :

Answer: C) Lead(II) oxide Explanation: The systematic name for a chemical is the unique name given to it by the International Union of Pure Applied Chemistry (IUPAC). The IUPAC name can differ from a chemical compound's general name.   PbO is an ionic compound since it consists of a Lead as metal and Oxygen as nonmetal. The systematic name for PbO is Lead (II) oxide. Here we need to put the (II) since lead has more than one combining capacity.

Q: The carbon tetrachloride molecule (CCl4) is 1308 0

  • 1
    a nonpolar molecule with polar bonds
    Correct
    Wrong
  • 2
    a nonpolar molecule with nonpolar bonds
    Correct
    Wrong
  • 3
    a polar molecule with polar bonds
    Correct
    Wrong
  • 4
    a polar molecule with nonploar bonds
    Correct
    Wrong
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Answer : 1. "a nonpolar molecule with polar bonds"
Explanation :

Answer: A) a nonpolar molecule with polar bonds Explanation: The four bonds of carbon tetrachloride (CCl4) are polar, but the molecule is nonpolar because the bond polarity is cancelled by the symmetric tetrahedral shape. Hence, making the net dipole as zero and molecule as non-polar.   When other atoms substitute for some of the Cl atoms, the symmetry is broken and the molecule becomes polar.

Q:

The gas used for artificial fruit ripening of green fruit is 

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  • 1
    Ethane
    Correct
    Wrong
  • 2
    Ethylene
    Correct
    Wrong
  • 3
    Methane
    Correct
    Wrong
  • 4
    Acetylene
    Correct
    Wrong
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Answer : 4. "Acetylene "

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