CBSE Class 12 Chemistry The p Block Elements Notes and Questions

Read and download free pdf of CBSE Class 12 Chemistry The p Block Elements Notes and Questions. Get printable school Assignments for Class 12 Chemistry. Class 12 students should practise questions and answers given here for Unit 07 The P-Block Elements Chemistry in Class 12 which will help them to strengthen their understanding of all important topics. Students should also download free pdf of Printable Worksheets for Class 12 Chemistry prepared as per the latest books and syllabus issued by NCERT, CBSE, KVS and do problems daily to score better marks in tests and examinations

Assignment for Class 12 Chemistry Unit 07 The P-Block Elements

Class 12 Chemistry students should refer to the following printable assignment in Pdf for Unit 07 The P-Block Elements in Class 12. This test paper with questions and answers for Class 12 Chemistry will be very useful for exams and help you to score good marks

Unit 07 The P-Block Elements Class 12 Chemistry Assignment

 

Points to remember:‐

The general valence shell electronic configuration of p‐block elements ns2 np1‐6
 
GROUP 15 ELEMENTS:‐

Group 15 elements ; N, P, As, Sb & Bi
General electronic configuration: ns2np3
Physical Properties:‐

 Dinitrogen is a diatomic gas while all others are solids.
 
 N & P are non‐metals. As & Sb metalloids & Bi is a metals . this is due to decrease in ionization enthalpy & increase in atomic size .
 
 Electro negativity decreases down the group .
 
Chemical properties:‐

 Common oxidation states : ‐3, +3 & +5.
 
 Due to inert effect, the stability of +5 state decreases down the group & stability of +3 state increases .
 
 In the case of Nitrogen all Oxidation states from +1 to +4 tend to disproportionate in acid solution , e.g.:‐ 3HNO3→H2O +2NO
Anamalous behavior of Nitrogen :‐ due to its small size, high electronegativity, high ionization enthalpy and absence of d‐orbital.
 
N2 has unique ability to pπ‐pπ multiple bonds whereas the heavier of this group do not form pπ–pπ because there atomic orbitals are so large & diffuse that they cannot have effective overlapping.
Nitrogen exists as diatomic molecule with triple bond between the two atoms whereas other elements form single bonds in elemental state. N cannot form dπ‐pπ due to the non availibility of d‐orbitals whereas other elements can.
 
 PROPERTIES:‐

(i)conc. HNO3 is a strong oxidizing agent & attacks most metals gold & Pt.
.
(ii)Cr & Al do not dissolve HNO3 because of the formation of a positive film of oxide on the surface.

(iii)it oxidises non metals like I2 to HNO3, C to CO2 , S to H2so4

(iv)brown ring tes is used to detect NO‐.

PHOSPHOROUS:‐

ALLOTROPIC FORMS: White , red α‐black &β‐black . White phosphorous is more reactive red phosphorous because white P exists as discrete P4 molecules . in red P several P4molecules are linked to formed polymeric chain.
 
Important Questions for NCERT Class 12 Chemistry The p Block Elements
 

Question. Which of the following has the highest dipole moment?
(a) SbH3
(b) AsH3
(c) NH3
(d) PH3 

Answer    C

Question. The basic character of hydrides of the V group elements decreases in the order
(a) NH3 > PH3 > AsH3 > SbH3
(b) SbH3 > AsH3 > PH3 > NH3
(c) SbH3 > PH3 > AsH3 > NH3
(d) NH3 > SbH3 > PH3 > AsH

Answer    A


Question. Among the following oxides, the lowest acidic is
(a) As4O6
(b) As4O10
(c) P4O6
(d) P4O10 

Answer    A


Question. Which of the following fluorides does not exist?
(a) NF5
(b) PF5
(c) AsF5
(d) SbF5 

Answer    A


Question. Which one has the lowest boiling point?
(a) NH3
(b) PH3
(c) AsH3
(d) SbH3

Answer   B


Question. Number of electrons shared in the formation of nitrogen molecule is
(a) 6
(b) 10
(c) 2
(d) 8

Answer    A


Question. Nitrogen is relatively inactive element because
(a) its atom has a stable electronic configuration
(b) it has low atomic radius
(c) its electronegativity is fairly high
(d) dissociation energy of its molecule is fairly high.

Answer   D


Question. Pure nitrogen is prepared in the laboratory by heating a mixture of
(a) NH4OH + NaCl
(b) NH4NO3 + NaCl
(c) NH4Cl + NaOH
(d) NH4Cl + NaNO2

Answer   D


Question. Which of the following statement is not correct for nitrogen?
(a) Its electronegativity is very high.
(b) d-orbitals are available for bonding.
(c) It is a typical non-metal.
(d) Its molecular size is small.

Answer    B


Question. Urea reacts with water to form A which will decompose to form B. B when passed through Cu2+ (aq), deep blue colour solution C is formed. What is the formula of C from the following?
(a) CuSO4
(b) [Cu(NH3)4]2+
(c) Cu(OH)2
(d) CuCO3·Cu(OH)2

Answer   B


Question. Aqueous solution of ammonia consists of
(a) H+
(b) OH
(c) NH4+
(d) NH4+ and OH.

Answer   D


Question. Which of the following oxides of nitrogen is paramagnetic?
(a) NO2
(b) N2O3
(c) N2O
(d) N2O5 

Answer   A


Question. Which of the following is a nitric acid anhydride?
(a) NO
(b) NO2
(c) N2O5
(d) N2O3

Answer    C


Question. When copper is heated with conc. HNO3 it produces
(a) Cu(NO3)2, NO and NO2
(b) Cu(NO3)2 and N2O
(c) Cu(NO3)2 and NO2
(d) Cu(NO3)2 and NO 

Answer    C


Question. Zn gives H2 gas with H2SO4 and HCl but not with HNO3 because
(a) Zn act as oxidising agent when react with HNO3
(b) HNO3 is weaker acid than H2SO4 and HCl
(c) in electrochemical series Zn is above hydrogen
(d) NO3– is reduced in preference to hydronium ion. 

Answer    D


Question. Sugarcane on reaction with nitric acid gives
(a) CO2 and SO2
(b) (COOH)2
(c) 2HCOOH(two moles)
(d) no reaction. 

Answer     B


Question. Which of the following phosphorus is the most reactive?
(a) Scarlet phosphorus
(b) White phosphorus
(c) Red phosphorus
(d) Violet phosphorus

Answer   B


Question. Each of the following is true for white and red phosphorus except that they
(a) are both soluble in CS2
(b) can be oxidised by heating in air
(c) consist of the same kind of atoms
(d) can be converted into one another.

Answer    A


Question. A compound ‘X’ upon reaction with H2O produces a colourless gas ‘Y’ with rotten fish smell. Gas ‘Y’ is absorbed in a solution of CuSO4 to give Cu3P2 as one of the products. Predict the compound ‘X’.
(a) Ca3P2
(b) NH4Cl
(c) As2O3
(d) Ca3(PO4)2

Answer   A


Question. PH4I + NaOH forms
(a) PH3
(b) NH3
(c) P4O6
(d) P4O10

Answer   A

Please click on below link to download pdf file for CBSE Class 12 Chemistry The p Block Elements Notes and Questions

Unit 12 Aldehydes, Ketones and Carboxylic Acids
CBSE Class 12 Chemistry Aldehydes Ketons Carboxylic Acids Questions

More Study Material

CBSE Class 12 Chemistry Unit 07 The P-Block Elements Assignment

We hope you liked the above assignment for Unit 07 The P-Block Elements which has been designed as per the latest syllabus for Class 12 Chemistry released by CBSE. Students of Class 12 should download and practice the above Assignments for Class 12 Chemistry regularly. We have provided all types of questions like MCQs, short answer questions, objective questions and long answer questions in the Class 12 Chemistry practice sheet in Pdf. All questions have been designed for Chemistry by looking into the pattern of problems asked in previous year examinations. 

Assignment for Chemistry CBSE Class 12 Unit 07 The P-Block Elements

Our team of expert teachers have referred to NCERT book for Class 12 Chemistry to design the Chemistry Class 12 Assignments. If you practice at least one test paper daily, you will get higher marks in Class 12 exams this year. Daily practice of Chemistry course notes and related study material will help you to clear all your doubts and have stronger understanding of all concepts. You can download all Revision notes for Class 12 Chemistry also from www.studiestoday.com absolutely free of cost.

Unit 07 The P-Block Elements Assignment Chemistry CBSE Class 12

All questions and their answers for the assignment given above for Class 12 Chemistry have been developed as per the latest curriculum and books issued for the current academic year. The students of Class 12 can rest assured that the best teachers have designed the questions of Chemistry so that you are able to revise the entire syllabus if you do the assignments. Lot of MCQ questions for Class 12 Chemistry have also been given in the worksheets and assignments for regular use. All study material for Class 12 Chemistry students have been given on studiestoday.

Unit 07 The P-Block Elements Assignment CBSE Class 12 Chemistry

Regular assignment practice helps to get a more comprehensive understanding of Unit 07 The P-Block Elements concepts. Assignments play a crucial role in understanding Unit 07 The P-Block Elements in CBSE Class 12. Students can download all the assignments of the same chapter in Class 12 Chemistry in Pdf format. You can print them or read them online on your computer or mobile.

CBSE Chemistry Class 12 Unit 07 The P-Block Elements Assignment

CBSE Class 12 Chemistry latest books have been used for coming up with the latest questions and solutions for the above assignment. If you have revised all concepts relating to Unit 07 The P-Block Elements then you should attempt all questions given in the test sheets above. We have also provided lot of Worksheets for Class 12 Chemistry which you can use to further make your self stronger in Chemistry

Where can I download in PDF assignments for CBSE Class 12 Chemistry Unit 07 The P-Block Elements

You can download free Pdf assignments for CBSE Class 12 Chemistry Unit 07 The P-Block Elements from StudiesToday.com

The assignments for Unit 07 The P-Block Elements Class 12 Chemistry for have been made based on which syllabus

The Unit 07 The P-Block Elements Class 12 Chemistry Assignments have been designed based on latest CBSE syllabus for Class 12 Chemistry issued for the current academic year

Can I download and print these printable assignments for Chemistry Unit 07 The P-Block Elements Class 12

Yes, These printable assignments for Unit 07 The P-Block Elements Class 12 Chemistry are free to download and print

How many topics are covered in Unit 07 The P-Block Elements Chemistry assignments for Class 12

All topics given in Unit 07 The P-Block Elements Chemistry Class 12 Book for the current academic year have been covered in the given assignment

Is there any charge for this assignment for Unit 07 The P-Block Elements Chemistry Class 12

No, all Printable Assignments for Unit 07 The P-Block Elements Class 12 Chemistry have been given for free and can be downloaded in Pdf format

How can I download the printable test assignments for Unit 07 The P-Block Elements Chemistry Class 12

Just click on the View or Download button below, then another window with the Pdf will be visible, just click on the Pdf icon to download the free assignments for Unit 07 The P-Block Elements Class 12 Chemistry

Are these assignments available for all chapters in Class 12 Chemistry

Yes, apart from Chemistry you can download free assignments for all subjects in Class 12

Can I download solved assignments for Unit 07 The P-Block Elements CBSE Class 12 Chemistry

Our team of expert teachers at studiestoday.com have provided all answers for the practice questions which have been given in Class 12 Chemistry Unit 07 The P-Block Elements assignments