The s-block elements of the Periodic Table have only
s block comprises of only two groups alkali metal group and alkaline earth metal groups
The general electronic configuration of ns2 exists in:
The general electronic configuration of ns2 exists in alkaline earth metals
In the preparation of Sodium carbonate the by- product formed is:
CaCl2 is the by product.
Heating a pulverised mixture of limestone and clay in a rotary kiln is used in the manufacture of:
Heating a pulverised mixture of limestone and clay in a rotary kiln is used in the manufacture of Portland cement
Dead burnt plaster is
Dead burnt Plaster is CaSO4
Group I of the periodic Table consists of the elements collectively known as
Group I ( ns1) is alkali metal group.
The alkali metals and their salts impart characteristic colour to an oxidizing flame because:
Alkali metals have one unpaired electron in their valence shell which gets excited absorbing the energy from flame and emit in visible reason of EM spectrum. Therfore imparts color to flame.
Washing soda is
Washing soda is Na2CO3.10 H2O
Cement is an industrially important compound of
Cement is the important compound of Calcium.
Suspension of slaked lime in water is known as
Suspension of slaked lime in water is known as milk of magnesia.
Group Il of the periodic table with one exception consists of the elements collectively known as
Group II ( ns2) is alkaline Earth metal group
Flame photometry is used to detect
Flame photometry is used to detect alkali metals.
The common salt or table salt is
Common salt is NaCl.
The alkali metals are low melting. Which of the following alkali metal is expected? to melt if the room temperature rises to 30∘C?
Cs has very low melting point (30∘C)
Which of the following elements does not form hydride by direct heating with dihydrogen?
Be doesnot form hydride directly by reacting with hydrogen.
One of the following is not called alkaline earth metal.
Ist element of every group differs from rest elements in their properties.
The electronic configuration of 7s1 belongs to
Fr belongs to 7th period so n=7.
Caustic soda is
Caustic Soda is NaOH.
Alkali metals react with water vigorously to form hydroxides and dihydrogen.Which of the following alkali metals reacts with water least vigorously?
Li reacts with water least vigorously.
A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is
Ca give brick red flame.
Calcium and Magnesium belong to the category of
They are alkaline earth metals
The alkali metals burn vigorously in oxygen forming oxides. Hence, potassium forms
alkali metals burns vigorously to form superoxides.
Sodium hydrogencarbonate is known as
NaHCO3 is baking soda.
The reducing power of a metal depends oh various factors. Suggest the factor which makes Li, the strongest reducing agent in aqueous solution.
Lithium has highest hydration enthalpy which accounts for its high negative E° value and its high reducing power.
Which of the following statements is true about Ca(OH)2?
Ca(OH)2 is used in the manufacture of bleaching powder.