CHEMISTRY THE P-BLOCK ELEMENTS-11th
QUIZ-12
Dear Readers,
IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies.
Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..
Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..
Q1.Water softener is
Solution
Both (a) and (b)
Both (a) and (b)
Q2.Name of the structure of silicates in which three oxygen atoms of [SiO4]4- are shared is
Solution
Sheet silicate
The structure of silicates has been found with the help of X-ray diffraction techniques.
All silicates have tetrahedral SiO44- ion, as a basic building unit ie, all silicates are composed of many units.
Tetrahedral shape of [SiO4]4- ion is due to sp3 -hybridisation of Si-atom.
Sheet silicates are formed when three oxygen atoms (bridging O-atoms) of each (SiO4)4-unit are shared. Hence, the general formula of sheet silicates is (Si2O5)2n-
Sheet silicate
The structure of silicates has been found with the help of X-ray diffraction techniques.
All silicates have tetrahedral SiO44- ion, as a basic building unit ie, all silicates are composed of many units.
Tetrahedral shape of [SiO4]4- ion is due to sp3 -hybridisation of Si-atom.
Sheet silicates are formed when three oxygen atoms (bridging O-atoms) of each (SiO4)4-unit are shared. Hence, the general formula of sheet silicates is (Si2O5)2n-
Q3.Al3+ of KAl(SO4)2.12H2O (alum) can be replaced by
Solution
All being trivalent
All being trivalent
Q4.The substance used as a fast drying agent in the laboratory is
Solution
Anhydrous calcium chloride
Anhydrous calcium chloride
Q5.Standard reduction electrode potential of lead suggests that it is reactive metal but it appears more noble (unreactive). It is due to
Solution
both (A) and (B)
Lead often appears more noble (unreactive) than expected from its standard patential of −0.13V. This inertness is partly due to the surface coating of oxide and partly due to the high over potential for reduction of H+to H2 at Pb surface.
both (A) and (B)
Lead often appears more noble (unreactive) than expected from its standard patential of −0.13V. This inertness is partly due to the surface coating of oxide and partly due to the high over potential for reduction of H+to H2 at Pb surface.
Q6.An alloy of boron and aluminium is allowed to react with NH3. Products formed are
Solution
B + NH3 → BN + H2
Al + NH3 → Al(NH2)3 + H2
B + NH3 → BN + H2
Al + NH3 → Al(NH2)3 + H2
Q7.Which of the following has the highest calorific value?
Solution
Coal gas
Calorific value: The amount of energy produced by the complete combustion of a material or fuel.
Coal gas H2 + CO + CH4 has the highest calorific value.
Coal gas
Calorific value: The amount of energy produced by the complete combustion of a material or fuel.
Coal gas H2 + CO + CH4 has the highest calorific value.
Q8.When chlorine is passed through molten tin, the product obtained is
Solution
Sn + 2Cl2 → SnCl4
Sn + 2Cl2 → SnCl4
Q9.When vapours of SiCl4 are passed over hot Mg, then the product formed is
Solution
SiCl4 + 2Mg → 2MgCl2 + Si
SiCl4 + 2Mg → 2MgCl2 + Si
Q10. Borax is used as a buffer since
Solution
B(OH)3 and [B(OH)4]-
B(OH)3 and [B(OH)4]-
