Eamcet - Chemistry - P Block Elements 13 And 14 Groups

In the Dewar's method of separation of noble gases, the mixture of noble gases is kept in contact with coconut charcoal at 173K. Which one of the following gaseous mixtures is not adsorbed on to the charcoal ?

A.  Ar, Kr

B.  Xe, Ar

C.  He, Ne

D.  Xe, Kr

View Answer  

Correct Answer :

He, Ne



Explanation :
No Explanation available for this question

Which of the following has S---S bond ?

A.  H2S2O6

B.  H2S2O7

C.  H2S2O8

D.  Mustard gas

View Answer  

Correct Answer :

H<sub>2</sub>S<sub>2</sub>O<sub>6</sub>



Explanation :
No Explanation available for this question

The number of oxygen atoms bonded to one phosphorus atom in P4O6 is:

A.  4

B.  3

C.  6

D.  5

View Answer  

Correct Answer :

3



Explanation :
No Explanation available for this question

Which of the following is not correct

A.  SiO2 is used as acid flux

B.  The distance between the layers in graphite is 3.35 x 10-3 cm

C.  SiO2 reacts with Na2CO3 and liberates CO.

D.  The hybridization of C in graphite is sp2

View Answer  

Correct Answer :

SiO<sub>2</sub> reacts with Na<sub>2</sub>CO<sub>3</sub> and liberates CO.



Explanation :
No Explanation available for this question

 Which of the following is not correct

A.  Ammonia is used as refrigerant

B.  A mixture of Ca(CN)2 and C is known as nitrolim

C.  A mixture of Ca(H2PO4)2 and CaSO4.2H2O is known as superphosphate of lime

D.  Hydrolysis of NCI3 gives NH3 and HOCl

View Answer  

Correct Answer :

A mixture of Ca(CN)<sub>2</sub> and C is known as nitrolim



Explanation :
No Explanation available for this question

The molecular formula of potash alum is :

A.  KAI2S4H48O40

B.  K2AI2S4H48O39

C.  K2AI2S4H48O40

D.  KAI2S4H48O40

View Answer  

Correct Answer :

K<sub>2</sub>AI<sub>2</sub>S<sub>4</sub>H<sub>48</sub>O<sub>40</sub>



Explanation :
No Explanation available for this question

In Fischer-Ringe's method of separation of nobles gas mixture, from air is used

A.  90% CaC2 + 10% CaCl2

B.  Coconut charcoal

C.  Soda lime + potash solution

D.  90% CaCO3 + 10% urea

View Answer  

Correct Answer :

90% CaC<sub>2</sub> + 10% CaCl<sub>2</sub>



Explanation :
No Explanation available for this question

Observe the following statements regarding purification of bauxiteI. During Hall's process, silica is removed as Si (vapour)II. Bauxite ore contaminated with Fe2O3 is purified in Baeyer's processIII. During Serpeck's process, AlN is formedThe correct answer is

A.  I, II and III are correct

B.  Only I and II are correct

C.  Only I and III are correct

D.  Only II and III are correct

View Answer  

Correct Answer :

Only II and III are correct



Explanation :
No Explanation available for this question

Which of the following is not correct

A.  Iodine oxidises sodium thiosulphate to sodium tetrathionate

B.  Sodium thiousulphate is soluble in water

C.  Ozone is used to identify the presence of unsaturation in alkenes

D.  Sodium thiosulphate reacts with iodine to form sodium sulphate

View Answer  

Correct Answer :

Sodium thiosulphate reacts with iodine to form sodium sulphate



Explanation :
No Explanation available for this question

Which one of the following pairs of reactants does not form oxygen when theyreact with each other

A.  F2,  NaOH solution (hot, conc.)

B.   F2, H20

C.  Cl2, NaOH solution (cold, dilute)

D.  CaOCl2, H2S04 (dilute, small amount)

View Answer  

Correct Answer :

Cl<sub>2</sub>, NaOH solution (cold, dilute)



Explanation :
No Explanation available for this question

Bauxite is a mineral for the extraction of :

A.  Ca

B.  Cu

C.  AI

D.  Fe

View Answer  

Correct Answer :

AI



Explanation :
No Explanation available for this question

The chemical formula of feldspar is

A.  KAlSi3O8

B.  Na3AlF6

C.  NaAlO2

D.  K2SO4 . Al2(SO4)3 . 4Al(OH)3

View Answer  

Correct Answer :

KAlSi<sub>3</sub>O<sub>8</sub>



Explanation :
No Explanation available for this question

The formula of the product formed, when sodium thiosulphate solution is added to silver bromide is

A.  Ag2S2O3

B.  Ag2S

C.  Na3[Ag(S2O3)2]

D.  Ag3[Na(S2O3)2]

View Answer  

Correct Answer :

Na<sub>3</sub>[Ag(S<sub>2</sub>O<sub>3)2</sub>]



Explanation :
No Explanation available for this question

The following are some statements related to VA group hydrides,I . Reducing  property increases from NH3 to BiH3.II..Tendency to donate lone pair decreases from NH3 to BiH3III.Thermal stability of hydrides decreases from NH3 to BiH3.IV. Bond angle of hydrides decreases from NH3 to BiH3.The correct statements are

A.  I, II, III and IV

B.  I, III and IV

C.  I, II and IV

D.   I and IV

View Answer  

Correct Answer :

I, II, III and IV



Explanation :
No Explanation available for this question

Which one of the following noble gases is used in miner's cap lamps

A.  Helium

B.  Neon

C.  Argon   

D.  Krypton

View Answer  

Correct Answer :

Krypton<br>



Explanation :
No Explanation available for this question

Which of the following is not a peroxy acid

A.  Perphosphoric acid

B.  Pernitric acid

C.  Perdisulphuric acid

D.  Perchloric

View Answer  

Correct Answer :

Perchloric



Explanation :
No Explanation available for this question

Calorific value of producer gas is low because of

A.  high percent of N2

B.  low percent of CO2

C.  high percent of CO

D.  low percent of N2

View Answer  

Correct Answer :

low percent of N<sub>2</sub>



Explanation :
No Explanation available for this question

Which of the following is used for making optical instruments ?

A.  SiO2

B.  Si

C.  SiH4

D.  SiC

View Answer  

Correct Answer :

SiO<sub>2</sub>



Explanation :
No Explanation available for this question

CFCl3 is responsible for the decomposition of ozone to oxygen. Which of the following reacts with ozone to form oxygen ?

A.  Cl2

B.  Cl-

C.  F-

D.  Cl+

View Answer  

Correct Answer :

Cl<sup>+</sup>



Explanation :
No Explanation available for this question

What is the correct order of occurrence (% by weight) in air of Ne, Ar and Kr ?

A.  Ne > Ar > Kr

B.  Ar > Ne > Kr

C.  Ar > Kr > Ne

D.  Ne > Kr > Ar

View Answer  

Correct Answer :

Ar &gt; Ne &gt; Kr



Explanation :
No Explanation available for this question

Observe the following statements :I.   Bleaching   powder   is   used   in   the preparation of chloroform.II.  Bleaching powder decomposes in the presence ofCoCl2 to liberate 02.III.Aqueous KHF2 is used in the preparation of fluorine.The correct combination is :

A.  I , II and II are correct

B.  Only II is correct

C.  Only I and III are correct

D.  Only I and II are correct

View Answer  

Correct Answer :

Only I and II are correct



Explanation :
No Explanation available for this question

Hydrolysis of NCI3 gives NH3 and X. Which of the following is X ?

A.  HClO4

B.  HClO3

C.  HOCl

D.  HClO2

View Answer  

Correct Answer :

HOCl



Explanation :
No Explanation available for this question

 Fluorine reacts with dilute NaOH and forms a gaseous product A. The bond angle in the molecule of A is

A.  1040 40'

B.  1030

C.  1070

D.  1090 28'

View Answer  

Correct Answer :

103<sup>0</sup>



Explanation :
No Explanation available for this question

The type of bonds present in sulphuric anhydride

A.  3 σ and three pπ -dπ

B.  3 σ, one pπ - pπ and two pπ - dπ

C.  2 σ and three pπ-dπ

D.  2 σ and two pπ-dπ

View Answer  

Correct Answer :

3 σ, one pπ - pπ and two pπ - dπ



Explanation :
No Explanation available for this question

Which pair of oxyacids of phosphorous contain ‘P - H' bonds

A.  H3PO4, H3PO3

B.  H3PO5, H4P2O7

C.  H3PO3, H3PO2

D.  H3PO2 ,  HPO3

View Answer  

Correct Answer :

H<sub>3</sub>PO<sub>3</sub>, H<sub>3</sub>PO<sub>2</sub>



Explanation :
No Explanation available for this question

SiCl4 on hydrolysis forms X and HCI. Compound X loses water at 1000oC and gives Y. Compounds X and Y respectively are

A.  H2SiCl6 , SiO2

B.  H2SiO4  ,Si

C.  SiO2 , Si

D.  H4SiO4  ,SiO2

View Answer  

Correct Answer :

H<sub>4</sub>SiO<sub>4&nbsp; ,</sub>SiO<sub>2</sub>



Explanation :
No Explanation available for this question

Aluminium reacts with NaOH and forms compound X. If the coordination number of aluminium in X is 6, the correct formula of X

A.  [Al(H2O)4(OH)2]+

B.  [Al(H2O)3(OH)3]

C.  [Al(H2O)2(OH)4]-

D.  [Al(H2O)6](OH)3

View Answer  

Correct Answer :

[Al(H<sub>2</sub>O)<sub>2</sub>(OH)<sub>4</sub>]<sup>-</sup>



Explanation :
No Explanation available for this question

Which of the following is the anhydride of HNO3

A.  NO

B.  N2O3

C.  N2O4

D.  N2O5

View Answer  

Correct Answer :

N<sub>2</sub>O<sub>5</sub>



Explanation :
No Explanation available for this question

Helium mixed with oxygen is used in the treatment of:

A.  Beri beri

B.  burning feet

C.  Joints burning

D.  Asthma

View Answer  

Correct Answer :

Asthma



Explanation :
No Explanation available for this question

While phosphorus form PCl5, nitrogen does not form NCl5 because

A.  Nitrogen is more electro negative than phosphorus

B.  Nitrogen atom is smaller than phosphorus

C.  The ionisation energy of nitrogen is greater than that of phosphorus

D.  Unlike phosphorous, nitrogens has no d-orbital in its valence shell

View Answer  

Correct Answer :

Unlike phosphorous, nitrogens has no d-orbital in its valence shell



Explanation :
No Explanation available for this question