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The P-Block Quiz-7

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..


Q1. The bond angle in OFout of OF, Cl2O ,Br2O is minimum. It is because in case of OF2

  •  Electrons are nearer to fluorine due to high electronegativity of F compared to Cl to Br
  •  Lone pair-lone pair repulsion decreases bond angle
  •  Both (a) and (b) are correct
  •  None of the above is correct
Solution
(a)Electrons are nearer to fluorine due to high electronegativity of F compared to Cl to Br 



Q2. Which is the incorrect statement?

  •  All halogens form oxyacids
  •  All halogens show -1, +1, +3, +5, +7 oxidation states
  •  Hydrofluoric acid forms KHF2 and K2F2 and attacks glass 
  •  Oxidising power is in order F2 > Cl> Br> I2
Solution 
(b) All halogens show -1, +1, +3, +5, +7 oxidation states 
     Fluorine shows only (-1) oxidation state


Q3. Estimation of ozone can be made quantitatively by

 

  •  Decomposition into Oand absorption of Ointo pyrogallol
  •  Volumetric method using KI and titration of the liberated iodine using hypo solution
  •  Oxidative ozonolysis method
  •  All methods given above
Solution
(b) Volumetric method using KI and titration of the liberated iodine using hypo solution



Q4. Consider the following compounds

         I. Sulphur dioxide

        II. Hydrogen peroxide                 

       III. Ozone

     Among these compounds, those which can act as bleaching agents would include

  •  I and III
  •  II and III
  •  I and II
  •  I,II and III
Solution
(c) I and II


Q5. Least stable oxide of chlorine is
  •  Cl2O4
  •  ClO2
  •  Cl2O7
  •  Cl2O6
Solution
(a) Cl2O4



Q6. Acid strength of HX (X= F, Cl, Br, I) is dependent on
  •  The electronegativity differences of H and X 
  •  The tendency of the hydrated molecule to form H+ 
  •  Both (a) and (b)
  •  None of the above
Solution
(c) Both (a) and (b)


Q7. All of the following have a tetrahedral shape except

  •  SO42-
  •  XeF4
  •  ClO4-
  •  XeO4
Solution
(b) XeF4


Q8. Which have distorted geometry based on VSEPR model?

 

  •  XeF, XeF, XeO3
  •  XeOF, XeO, XeF2
  •  NH, SO, H2O
  •  All of these
Solution
(d) All of these



Q9. Xenon fluorides acts as fluoride acceptor with
  •  RbF
  •  CsF
  •  Both (a) and (b)
  •  None of these
Solution
(c) Both (a) and (b)


Q10. When molten sulphur is suddenly cooled by pouring into water, it takes the form of
  •  Milk of sulphur
  •  Colloidal sulphur
  •  Flower of sulphur
  •  Plastic sulphur
Solution
(d) Plastic sulphur





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