NAT II Biological Science Chemistry With Answers

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NAT II Biological Science Chemistry

Sr. # Questions Answers Choice
1 Each of following is true of white and red phosphours except that they Are both soluble in CS<sub>2</sub> Can be oxidized by heating in air Consist of the same kind of atoms Can be converted into one another
2 Which one of the following compounds does not exist? NCl<sub>5</sub> AsF<sub>5</sub> SbCl<sub>5</sub> PF<sub>5</sub>
3 BiCl3on hydrolysis forms a white precipitate of Bismuthio acid Bismuth oxychloride Bismuth pentachloride Bismuth hydroxide.
4 Phosphide ion has the electronic structure similar to that of Nitride ion Fluoride ion Sodium ion Chloride ion
5 Which one of the following elements occurs free in nature? N P As Sb
6 Red lead is PbO Pb<sub>3</sub>O<sub>4</sub> PbO<sub>2</sub> Pb<sub>4</sub>O<sub>3</sub>
7 Which of the following statements is correct with respect to the property of elements with increase in atomic number in the carbon family (group 14)? Their metallic character decreases The stability of +2 oxidation state increases Their ionization energy increases Their atomic size decreases
8 White lead is Basic lead acetate Acidic lead carbonate Basic lead carbonate Basic lead hydroxide
9 Which of the following has no tin in its composition? Solder Bronze Brass Tin stone
10 The chemical composition of white lead is Na<sub>2</sub>CO<sub>3</sub> Pb<sub>3</sub>O<sub>4</sub> Pb(OH)<sub>2</sub>.2PbCO<sub>3</sub> PbO
11 The principal constituent of pyrex glass Zn B Pb Cl
12 The halide which is not hydrolysed is SiCl<sub>4</sub> SiF<sub>4</sub> CCl<sub>4</sub> PbCl<sub>4</sub>
13 When excess of SnCl2is added to a solution of HgCl2, a white precipitate turning to grey is obtained. They grey colour is due to the formation of Hg<sub>2</sub>Cl<sub>2</sub> SnCl<sub>4</sub> Sn Hg
14 Galena is an ore of Gallium Lead Tin Germanium
15 The substance used as a smoke screen in warfare is SiCl<sub>4</sub> PH<sub>3</sub> PCl<sub>5</sub> Acetylene
16 Al is more reactive than Fe but Al is less easily corroded than Fe because It is a noble metal oxygen forms a protective reaction easily with water Iron undergoes reaction easily with water Fe form mono and divalent ions.
17 Alum is not used As a mordant in dyeing As an insecticide In purification of water In tanning of leather
18 Which is true for an element R present in group 13 of the periodic table? It is a gas at room temperature It has oxidation state of +4 It forms R<sub>2</sub>O<sub>3</sub> It forms RX<sub>2</sub>
19 In which of the following elements +1 oxidation state is more stable than +3 B Al ga Ti
20 Inert pair effect plays an important role in case of F Al Si Tl
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