SAMPLE CHEMISTRY QUESTIONS FROM PAKPREP.COM

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Topic:

Chemical Bonding

Question:

Bond energy can also be regarded as:

Options:

  • Bond enthalpy
  • Bond diffusing energy
  • Bond breaking energy
  • All of thes

Correct Answer:

All of these

Explanation:

Bond energy is the amount of energy required to break bonds in one mole of a substance. All of the options given below have same meaning thus all options can be regarded as bond energy.

Topic:

Electrochemistry

Question:

The oxidation of oxygen in peroxides is?

Options:

  • +1
  • -1
  • +2
  • -2

Correct Option:

-1

Explanation:

Peroxides include hydrogen peroxide, H2O2. This is an electrically neutral compound and so the sum of the oxidation states of the hydrogen and oxygen must be zero.

Topic:

Transition Elements

Question:

Transition elements from complexes due which of the following reason?

Options:

  • Para magnetism
  • Vacant d-orbitals
  • Large nuclear charge
  • Small cation size

Correct Option:

Vacant d-orbitals

Explanation:

Vacant orbitals of central metal atom or iron are filled by ligands to form metal complexes.

In Chemistry, a coordination complex or metal complex consists of a central atom or ion which is usually metallic and is called the coordination center and a surrounding array of bound molecules or ions that are in turn known as ligands or complexing agents. Many metal containing compounds, especially those of transition metals are coordination complexes.

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