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Zeolites are :-...

Zeolites are :-

A

Water softner

B

Catalyst

C

cation exchanger

D

All of these

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The correct Answer is:
D
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Which of the following small-sized elements can repalce silicon and aluminium in the framework at zeolites a. Boron b. Magnesium c. Phosphorus d. All ii. Zeolites are microporous aluminosilicates with general formula a. M[(AlO_(2))_(x)].mH_(2)O b. M_(x)[AlO_(2))_(x)(SiO_(2))_(y)] c. M_(x)[(SiO_(2))_(y)].mH_(2)O d. M_(x//n)[(AlO_(2))_(x)(SiO_(2))_(y)(SiO_(2))_(y)].mH_(2)O iii. The zeolites have shape selectivity depending on a. Pore structure b. Atomic structure C. Molecular structure d. None

Give reason for the following: Zeolites act as shape selection catalysts.

Central atom may exhibit sp^(3) hybridisation in how many of the following species: (a) CO_(2) , (b)Graphite , ( c)Diamond , (d) CO (e) H_(3)BO_(3) (aq) , (f)Zeolites (Si -central) , (g)Silicones (Si) (h)Chlorosilane (Si) (i)Borax (Boron) , (j) Al_(2)Cl_(6) , (k) B_(2)H_(6) , (l) SiO_(2) (m) H_(2)CO_(3) , (n) COCl_(2) , (o) CH_(4) , (p) C Cl_(4)

Zeolite or permutit has the formula

The activity and selectivity of zeolites as catalyst is based on :-

Assertion :- Zeolite is shape selective catalyst. Reason :- Size of the pores of the catalyst are such that they can trap only selective molecules.

each question contain STATEMENT-1(Assertion ) and STATEMENT - 2 (reason). examine the statement carefully and work the correct answer accoridng to the instructions given below : STATEMENT-1: ZSM-5 is a type of zeolites used as a catalyst in petrochemical industries. STATEMENT-2: Zeolites are microporous aluminusilicates three dimensional network silicates in which some silicon atoms are replaced by aluminium atoms.

Give the correct order of initials T(true) or F(false) for following statements. (a) Micelles formation takes place only above craft temperature (b)ZSM-5 is a type of zeolites used as a catalyst in petrochemical industries. (c)A micell is an aggregation of surfactants in in aqueous solution, often spherical (d) Lyophilic sols are irreversible sols

Zeolite, which shows ion exchange ability

Basic unit fo zeolite, mica, asbestos and feldpar is

ALLEN-SURFACE CHEMISTRY -ASSERTION & REASO
  1. Zeolites are :-

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  2. Assertion(A): Langmuir adsorption is a single-layer phenomenon. Reas...

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  3. Assertion :- A sol of As(2)S(3) prepared by the action of H(2)S on As(...

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  4. Assertion(A): Physical adsorption of milecules on the surface requires...

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  5. Assertion :- Filtration of colloidal particles is not possible by filt...

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  6. Assertion :- A gas mixed with another gas forms a colloidal solution. ...

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  7. Assertion :- Lyophilic sol is more stable than lyophobic sol. Reaso...

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  8. Assertion :- Associated colloids are formed by aggregation of large no...

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  9. Assertion :- In case of chemical adsorption, (x)/(m) first increase th...

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  10. Assertion :- Physical adsorption forms multimolecular layer. Reason ...

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  11. Assertion :- The graphical representation of physical adsorption with ...

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  12. Assertion :- Zeolite is shape selective catalyst. Reason :- Size of ...

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  13. Assertion :- Lyophilic sol coagulate by adding other solvent. Reason...

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  14. Assertion :- Catalyst is more effective in powdered form. Reason :- ...

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  15. Assertion :- During physical adsorption multimolecular layers are form...

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  16. Assertion: A quious gold colloidal solution is red in colour. Reason...

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  17. Assertion(A): Alcohols are dehydrated to hydrocarbons in the pressure ...

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  18. Assertion(A): The micelle formed by sodiumm stearate in water has -COO...

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  19. Assertion: Reaction of SO(2) and H(2)S in the presence of Fe(2)O(3) ca...

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  20. Assertion(A): Fe^(3)+ can be used for coagulation of As(2)S(3) sol. ...

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  21. Assertion (A): Micelles are formed by surfactant molecules above the c...

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