Chapter 16: Chemistry in Everyday Life
16.1. 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?Ans: Most of drugs taken in doses higher than recommended may…
Chapter 15: Polymers
15.1. What are polymers?Ans: Polymers are high molecular mass substances (103 — 107u) consisting of a very large number of simple repeating structural units joined together through covalent bonds in a linear fashion. They are also called macromolecules. Ex:…
Chapter 14: Biomolecules
14.1. Glucose or sucrose are soluble in water but cyclohexane and benzene (simple six membred ring compounds) are insoluble in water Explain.Ans: The .solubility of a solute in a given solvent follows the rule ‘ Like dissolves like’.Glucose…
Chapter 13: Amines
13.1. Classify the following amines as primary, secondary and tertiary:Ans: (i) 1° (ii) -3° (iii) 1° (iv) 2° 13.2. Write the structures of different isomeric amines corresponding to the molecular formula, C4H11N.(i) Write the IUPAC names of all…
Chapter 12: Aldehydes Ketones and Carboxylic Acids
12.1. Write the structures of the following compounds:(i) α-Methoxypropionaldehyde(ii) 3-Hydroxybutanal(iii) 2-Hydroxycyclopentane carbaldehyde(iv) 4-OxopentanaI(v) Di-sec.butylketone(vi) 4-fluoroaeetophenoneAns: 12.2. Write the structures of the products of the following reactions:Ans: 12.3. Arrange the following compounds in increasing order of their boiling…
Chapter 11: Alcohols Phenols and Ether
11.1. Classify the following as primary, secondary and tertiary alcohols. Ans: Primary alcohols: (i), (ii), (iii)Secondary alcohols: (iv), (v)Tertiary alcohols: (vi) 11.2. Identify aliylic alcohols in the above examples.Ans: (ii) and (iv) i.e. H2C=CH – CH2OH and 11.3. Name…
Chapter 10: Haloalkanes and Haloarenes
10.1 Write structures of the following compounds:(i) 2-Chloro-3-methylpentane(ii) 1-Chloro-4-ethylcydohexane(iii) 4-tert. Butyl-3-iodoheptane(iv) 1,4-Dibromobut-2-ene(v) 1-Bromo-4-sec. butyl-2-methylbenzene.Ans: 10.2. Why is sulphuric acid not used during the reaction of alcohols with KI?Ans: KI is expected to give HI on reacting with H2SO4 which…
Chapter 9: Coordination Compounds
9.1. Write the formulas for the following coordination compounds:(i)Tetraamminediaquacobalt(IlI) chloride(ii)Potassium tetracyanidonickelate(II)(iii)Tris(ethanp-1,2-diamine) chromium(III) chloride(iv)Amminebromidochloridonitrito-N- platinatc(II)(v)Dichloridobis(ethane-l ,2-diamine) platinum (IV) nitrate(vi)Iron(III)hexacyanidoferrate(II)Ans: (i) [CO(NH3)4(H2O)2]Cl3.(ii)K2[Ni(CN)4](iii)[Cr(en)3]Cl3(iv)[Pt (NH3) Br Cl (N02)]–(v)[PtCl2(en)2](N03)2(vi)Fe4[Fe(CN)6]3 9.2. Write IUPAC names of following co-ordination compounds :(a) [CO(NH3)6]Cl3(b) [CO(NH3)Cl]Cl2(C) K3[Fe(CN)6](d) [K3[Fe(C2O4)3](e) K2[PdCl4](f)…
Chapter 8: The d and f Block Elements
8.1. Silver atom has completely filled d orbitals (4d10) in its ground state. How can you say that it is a transition element?Ans: The outer electronic configuration of Ag (Z=47) is 4d105s1. It shows+1 and + 2 O.S….
Chapter 7: The p Block Elements
NCERT IN TEXT QUESTIONS 7.1. Why are pentahalides more covalent than trihalidcs?Ans: The group 15 elements have 5 e-1 s in their valence shell. It is difficult to lose 3e-1s to form E3+ and even more difficult to lose 5e-1 s to…
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