Self Studies
Self Studies
Self Studies
Self Studies

Chemistry Test 34

Result Self Studies

Chemistry Test 34
  • Score

    -

    out of -
  • Rank

    -

    out of -
TIME Taken - -
Self Studies

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Self Studies Self Studies
Weekly Quiz Competition
  • Question 1
    4 / -1

    Which of the following amino acids can be synthesised in the body?

    Solution

    Amino acids which can be synthesised in the body are called non-essential amino acids.

    Examples: Alanine, glycine, proline etc. 

    Amino acids which cannot be synthesised in the body are called essential amino acids.

    Examples: Lysine, valine, leucine, phenyl alanine etc.

     

  • Question 2
    4 / -1

    The electronic configuration of the atom having maximum difference in the first and second ionisation energies is:

    Solution

    There is a quantum increase in the successive ionisation energies if the element acquires a stable configuration in the previous step.

    Alkali metals have one electron in the valence shell and acquire a stable octet configuration on the removal of the outermost electron. Hence, there is a quantum increase in the second ionisation energy.

    Option (1) shows the electronic configuration of Na, and with the removal of one electron it acquires the configuration of Neon. Therefore, it shows maximum difference in the first and second ionisation energies.

     

  • Question 3
    4 / -1

    Among the metals - Cr, Fe, Mn, Ti and Mg - the one that cannot be obtained by reduction of its metal oxide by aluminium is

    Solution

    The metal that acts as a reducing agent should have a lower reduction potential than the substance getting reduced.

    Since the reduction potential of Mg [Eo(Mg2+; Mg) = -2.37 V] is less than that of Al [Eo(Al+3; Al) = -1.66 V], it cannot be obtained by reduction of its compounds using Al.

     

  • Question 4
    4 / -1

    Which of the following is a set of elastomers?

    Solution

     

    - Buna S, Buna N and Neoprene, all are the examples of elastomers.

    - Nylon 66 and Terylene are the examples of fibres while Bakelite is an example of thermosetting polymers.

    - Buna S, Buna N are examples of elastomers and Nylon 66 is an example of fibers.

    - Neoprene is an example of elastomers, Terylene is an example of fibres and Bakelite is an example of thermosetting polymers.

     

  • Question 5
    4 / -1

    The compound needed for gravimetric estimation of copper (II) is:

    Solution

    Gravimetric analysis a technique used to estimate the percentage of a given element in an alloy or an impure sample. 

    The percentage of copper in an alloy containing copper is determined by adding slight excess of NH4SCN to the alloy in a slightly acidic medium and a reducing agent like H2SO3.

    Copper will be precipitated as CuSCN (solubility product Ksp = 12.7). This means that Cu2+ ions will be reduced to Cu+ before they are precipitated using SCN-.

    2Cu2+ + HSO3- + H2O → 2Cu+ + HSO4- + 2H+

    Cu+ + SCN- → CuSCN

     

  • Question 6
    4 / -1

    Accepting the definition that an acid is a proton donor, the acid in the reaction: NH3 + H2O → NH4+ + OH- is

    Solution

    According to the Lowry Bronsted concept of acids and bases, an acid is a proton donor and a base is a proton acceptor. In the given reaction, H2O is an acid and OH- ion is its conjugate base.

    NH3 + H2O → NH4+ + OH-

     

Self Studies
User
Question Analysis

  • Correct -

  • Wrong -

  • Skipped -

My Perfomance
  • Score

    -

    out of -
  • Rank

    -

    out of -
Re-Attempt Weekly Quiz Competition
Self Studies Get latest Exam Updates
& Study Material Alerts!
No, Thanks
Self Studies
Click on Allow to receive notifications
Allow Notification
Self Studies
Self Studies Self Studies
To enable notifications follow this 2 steps:
  • First Click on Secure Icon Self Studies
  • Second click on the toggle icon
Allow Notification
Get latest Exam Updates & FREE Study Material Alerts!
Self Studies ×
Open Now