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…
Here's What Happening in The
World of Learning
Here's What Happening in The
World of Learning
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…
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:…
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…
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…
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…
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…
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…
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)…
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….
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…
6.1. Which of the ores mentioned can be concentrated by magnetic separation method?Ans: Ores Which are magnetic in nature can be separated from non-magnetic gangue particles by magnetic separation method. For ex: ores of iron such as haemetite…