NAT II Biological Science Chemistry With Answers

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NAT II Biological Science Chemistry

Sr. # Questions Answers Choice
1 The addition of HBr is easiest with CH2 = CHCl CICH = CHCl CH3 - CH = CH2 (CH3)2 C = CH2
2 In Friedal-Craft's alkylation besides AlCl3the other reactants are C6H6 + NH3 C6H6 + CH4 C6H6 + CH3Cl C6H6 + CH3COCl
3 For preparing an alkane, a concentrated aqueous solution of sodium or potassium salt of saturated carboxylic acid is subjected to Hydrolysis Oxidation Hydrogenation Electrolysis
4 Octane number is zero for n-Heptane Isooctane n-Hexane Isoheptane
5 The IUPAC name of the compound having the formula (CH3)3C - CH = CH2is 1, 1-Dimethyl-3-butene 1, 1, 1-Trimethyl-3-propene 3, 3,-Dimethyl-1-butene 3, 3, 3,-Trimethyl-1-propene
6 Which of the following substances is used as an antiknock compound? Tetraethyl lead Lead tetrachloride Lead acetate Ethyl acetate
7 The order of reactivity of halogens in aliphatic substitution reactions is Br2 > C12 > F2 Cl2 > Br2 > F2 Cl2 C12 > Br2 F2 > Br2 > C12
8 Acetylene gives White ppt. with ammonical AgNO<sub>3</sub>and red ppt. with ammonical Cu(NO<sub>3</sub>)<sub>2</sub> White ppt. with ammonical AgNo<sub>3 and red ppt. with ammonical</sub>Cu<sub>2</sub>Cl<sub>2</sub> White ppt. with both Red ppt. with both
9 The essential component of organic compound is O C P N
10 Wholer prepared urea from Ammonia NH<sub>4</sub>CNO NH<sub>3</sub> Uric acid
11 Vital force theory was rejected by Berzelius Kolbe Wholer Lavoiser
12 The rotation of two carbon atoms joined by double bond would happened only if P<sub>i</sub>bond is broken Sigma bond is broken Both bonds are broken None of above
13 Which of the following has linear shape? SP SP<sup>2</sup> SP<sup>3</sup> None of the above
14 Hybridization explain the ----------- of orbitals Type of Bonding Shapes Shape and Type of bonding None of above
15 1-Chloropropane has two isomers. It is an example of Chain isomerism Position isomerism Function group isomerism Meramerism
16 The isomers due to the unequal distribution of carbon atoms on either side of the functional group belonging to the same homologous series are called Functional isomers Position isomers Chain isomers Metamers
17 In which molecule carbon atom is sp2hybridized CH<sub>4</sub> C2H<sub>4</sub> C<sub>2</sub>H<sub>2</sub> None of the above
18 When a carbon atom forms single bonds with other carbon atoms, these hybird orbitals overlap with the orbitals of hydrogen to form four bonds which are Three sigma and one P<sub>i</sub> Two sigma andtwo P<sub>i</sub> One sigma and three P<sub>i</sub> Sigma
19 Sodium thisoulphate is used in photography because of its Oxidizing behaviour Reducing behaviour Complexing behaviour Photochemical behavior
20 In the manufacture of iron from haematite, limestone is added to act as. Flux A reducing agent Slag An oxidizing agent
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