Self Studies
Self Studies
Self Studies
Self Studies

s-Block Elements Test - 5

Result Self Studies

s-Block Elements Test - 5
  • 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
    1 / -0

    Divalent magnesium and calcium ions are found in large proportions in biological fluids. They help in

    Solution

    Monovalent sodium and potassium ions and divalent magnesium and calcium ions are found in large proportions in biological fluids. These ions perform important biological functions such as maintenance of ion balance and nerve impulse conduction

  • Question 2
    1 / -0

    The alkali metals and their salts impart characteristic colour to an oxidizing flame because:

    Solution

    Alkali metals have one unpaired electron in their valence shell which gets excited by absorbing the energy from flame, excited states  are very unstable and quickly move back to lower state ,at that time they emit the energy in the form of radiation  in visible reason of electromagnetic spectrum  and is abserved as characteristic colour. 

  • Question 3
    1 / -0

    What is the oxidation state of K in KO2?

    Solution

    K has +1 oxidation state. "The potassium atom losses one electron when forming compound as it has one electron on it's valence shell".

  • Question 4
    1 / -0
    Arrange the following metals in decreasing order of their hydration enthalpy:

    Li, Rb, Na, K, Cs
  • Question 5
    1 / -0

    Among the alkali metals the most abundant are:

    Solution

    Na and K are highly abundant. Constituting 2.5 and 2.4 percent of the Earth's crust respectively the othwe alkali metals are  considerably rare.

  • Question 6
    1 / -0
    To a clear solution of a compound (X), a solution of barium chloride (BaCl2) is added to give a white precipitate which does not dissolve in dilute HCl. The compound (X) is
  • Question 7
    1 / -0

    One of the following is the rarest of all alkaline earth metals

    Solution

    Ra is found in Uranium and thorium ores in trace amounts as small as a seventh of a gram per ton of uraninite  so it is rarest of all alkaline earth  metals

  • Question 8
    1 / -0
    The correct order of increasing lattice energy of the metallic compounds is
  • Question 9
    1 / -0
    An alkali metal which exists in the liquid state at (or near) room temperature is
  • Question 10
    1 / -0
    Which of the following metal ions plays an important role in muscle contraction?
  • Question 11
    1 / -0
    Calcium carbide on hydrolysis forms
  • Question 12
    1 / -0
    A chemical compound 'A' is used for water softening to remove temporary hardness. 'A' reacts with Na2CO3 to form caustic soda. A substance B is the cause of temporary hardness and is removed as C. Then, A, B and C respectively are
  • Question 13
    1 / -0
    Which of the following is not an ore of magnesium?
  • Question 14
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    Which of the following statements is/are NOT true regarding alkali metal oxides?
  • Question 15
    1 / -0
    Which of the following compounds is/are formed when lithium is heated in air?
  • Question 16
    1 / -0
    The affinity of sodium with water is used in drying of
  • Question 17
    1 / -0
    Which of the following oxides is not expected to react with sodium hydroxide?
  • Question 18
    1 / -0
    Initial setting of cement is mainly due to
  • Question 19
    1 / -0
    H2O is dipolar whereas BeF2 is not. It is because
  • Question 20
    1 / -0

    The general electronic configuration of alkali metals is

    Solution

    The general electronic configuration of alkali metals is  ns1 as their outer most electron enters the S orbital and they have only on electron in their valence shell.

  • Question 21
    1 / -0

    The general electronic configuration of ns2 exists in:

    Solution

    The general electronic configuration of ns2 exists in alkaline earth metals as their outer most electron enter the S orbital  and they have only two electrons in their valence shell

  • Question 22
    1 / -0

    The alkali metals burn vigorously in oxygen forming oxides. Hence, potassium forms

    Solution

    alkali metals burns vigorously to form superoxides. Superoxide O2- ion is only in the presence of large cations such as potassium, Rb and Cs

  • Question 23
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    The molecular formula of Glauber's salt is
  • Question 24
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    NaOH solution is soapy to touch because
  • Question 25
    1 / -0

    Flame photometry is used to determine the concentration of the

    Solution

    Flame photometry is used to determine the concentration of alkali metalions, alkaline earth metals are quite sensitive to flame photometry.

  • Question 26
    1 / -0
    Which of the following statements is false in case of alkali metals?
  • Question 27
    1 / -0
    A mixture of MgCl2 and MgO is called
  • Question 28
    1 / -0

    he electronic configuration of Rn7s1 belongs to

    Solution

    Francium will fill orbitals all the way up to 7S (7th period) subshell whrer it will have half filled orbital : 7S1.

  • Question 29
    1 / -0
    Which of the following alkaline earth metals will give grassy green colour in flame?
  • Question 30
    1 / -0
    Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is
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