Solutions of Questions on Page Number : 448 Question 1: Sleeping pills are recommended by doctors to the patients suffering from sleeplessness but it is not advisable to take its doses without consultation with the doctor, Why? Answer: Most drugs when taken in doses higher than recommended may cause harmful effects and sometimes, may even lead to death. Hence, a doctor should always be consulted before taking any medicine. Question 2: With reference to which classification has the statement, ‘ranitidine is an antacid” been given? Answer: The given statement refers to the classification of pharmacological effects of the drug. This is because…
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In text : Solutions of Questions on Page Number : 428 Q1 : What are polymers? Answer : Polymers are high molecular mass macromolecules, which consist of repeating structural units derived from monomers. Polymers have a high molecular mass (103 – 107 u). In a polymer, various monomer units are joined by strong covalent bonds. These polymers can be natural as well as synthetic. Polythene, rubber, and nylon 6, 6 are examples of polymers. Q2 : How are polymers classified on the basis of structure? Answer : Polymers are classified on the basis of structure as follows: 1. Linear polymers:…
In text : Solutions of Questions on Page Number : 412 Q1 : Glucose or sucrose are soluble in water but cyclohexane or benzene (simple six membered ring compounds) are insoluble in water. Explain. Answer : A glucose molecule contains five -OH groups while a sucrose molecule contains eight -OH groups. Thus, glucose and sucrose undergo extensive H-bonding with water. Hence, these are soluble in water. But cyclohexane and benzene do not contain -OH groups. Hence, they cannot undergo H-bonding with water and as a result, are insoluble in water. Q2 : What are the expected products of hydrolysis of…
In text : Solutions of Questions on Page Number : 384 Q1 : Classify the following amines as primary, secondary or tertiary: (i) (ii) (iii) (C2H5)2CHNH2 (iv) (C2H5)2NH Answer : Primary: (i) and (iii) Secondary: (iv) Tertiary: (ii) Q2 : (i) Write structures of different isomeric amines corresponding to the molecular formula, C4H11N (ii) Write IUPAC names of all the isomers. (iii) What type of isomerism is exhibited by different pairs of amines? Answer : (i), (ii) The structures and their IUPAC names of different isomeric amines corresponding to the molecular formula, C4H11N are given below: (a) CH3-CH2-CH2-CH2-NH2 Butanamine (10)…
In text : Solutions of Questions on Page Number : 353 Q1 : Write the structures of the following compounds. (i) α-Methoxypropionaldehyde (ii) 3-Hydroxybutanal (iii) 2-Hydroxycyclopentane carbaldehyde (iv) 4-Oxopentanal (v) Di-sec-butyl ketone (vi) 4-Fluoroacetophenone Answer : (i) (ii) (iii) (iv) (v) (vi) Q2 : Write the structures of products of the following reactions; (i) (ii) (iii) (iv) Answer : (i) (ii) (iii) (iv) Q3 : Arrange the following compounds in increasing order of their boiling points. CH3CHO, CH3CH2OH, CH3OCH3, CH3CH2CH3 Answer : The molecular masses of the given compounds are in the range 44 to 46. CH3CH2OH undergoes extensive intermolecular H-bonding,…
In text : Solutions of Questions on Page Number : 317 Q1 : Classify the following as primary, secondary and tertiary alcohols: (i) (ii) (iii) (iv) (v) (vi) Answer : Primary alcohol → (i), (ii), (iii) Secondary alcohol → (iv), (v) Tertiary alcohol → (vi) Q2 : Identify allylic alcohols in the above examples. Answer : The alcohols given in (ii) and (vi) are allylic alcohols. Q3 : Name the following compounds according to IUPAC system. (i) (ii) (iii) (iv) (v) Answer : (i) 3-Chloromethyl-2-isopropylpentan-1-ol (ii) 2, 5-Dimethylhexane-1, 3-diol (iii) 3-Bromocyclohexanol (iv) Hex-1-en-3-ol (v) 2-Bromo-3-methylbut-2-en-1-ol Q4 : Show how are…
In text : Solutions of Questions on Page Number : 285 Q1 : Write structures of the following compounds: (i) 2-Chloro-3-methylpentane (ii) 1-Chloro-4-ethylcyclohexane (iii) 4-tert. Butyl-3-iodoheptane (iv) 1,4-Dibromobut-2-ene (v) 1-Bromo-4-sec. butyl-2-methylbenzene Answer : (i) 2-Chloro-3-methyl pentane (ii) 1-Chloro-4-ethylcyclohexane (iii) 4- tert-Butyl-3-iodoheptane (iv) 1, 4-Dibromobut-2-ene (v) 1-Bromo-4-sec-butyl-2-methylbenzene Q2 : Why is sulphuric acid not used during the reaction of alcohols with KI? Answer : In the presence of sulphuric acid (H2SO4), KI produces HI Since H2SO4 is an oxidizing agent, it oxidizes HI (produced in the reaction to I2). As a result, the reaction between alcohol and HI to produce alkyl iodide…
In text : Solutions of Questions on Page Number : 244 Q1 :Write the formulas for the following coordination compounds: (i) Tetraamminediaquacobalt(III) chloride (ii) Potassium tetracyanonickelate(II) (iii) Tris(ethane-1,2-diamine) chromium(III) chloride (iv) Amminebromidochloridonitrito-N-platinate(II) (v) Dichloridobis(ethane-1,2-diamine)platinum(IV) nitrate (vi) Iron(III) hexacyanoferrate(II) Answer : (i) (ii) (iii) (vi) (v) (vi) Q2 :Write the IUPAC names of the following coordination compounds: (i) [Co(NH3)6]Cl3 (ii) [Co(NH3)5Cl]Cl2 (iii) K3[Fe(CN)6] (iv) K3[Fe(C2O4)3] (v) K2[PdCl4] (vi) [Pt(NH3)2Cl(NH2CH3)]Cl Answer : (i) Hexaamminecobalt(III) chloride (ii) Pentaamminechloridocobalt(III) chloride (iii) Potassium hexacyanoferrate(III) (iv) Potassium trioxalatoferrate(III) (v) Potassium tetrachloridopalladate(II) (vi) Diamminechlorido(methylamine)platinum(II) chloride Q3 :Indicate the types of isomerism exhibited by the following complexes and…
In text : Solutions of Questions on Page Number : 212 Q1 : Silver atom has completely filled d orbitals (4d10) in its ground state. How can you say that it is a transition element? Answer : Ag has a completely filled 4d orbital (4d10 5s1) in its ground state. Now, silver displays two oxidation states (+1 and +2). In the +1 oxidation state, an electron is removed from the s-orboital. However, in the +2 oxidation state, an electron is removed from the d-orbital. Thus, the d-orbital now becomes incomplete (4d9). Hence, it is a transition element. Q2 : In…
Free NCERT Solutions for Class 12th Chemistry Chapter 6 The p-block Element solved by Expert Teachers as per NCERT (CBSE) Book guidelines and brought to you by CBSE Learning. These The p-block Element Exercise Questions with Solutions for Class 12 Chemistry covers all questions of Chapter The p-block Element Class 12 and help you to revise complete Syllabus and Score More marks as per CBSE Board guidelines from the latest NCERT book for class 12 Chemistry. You can read and download NCERT Book Solution to get a better understanding of all topics and concepts 7.1 – Group 15 Elements 7.2…