NAT II Physical Science Chemistry With Answers

NAT II Physical Science Chemistry

Sr. # Questions Answers Choice
1 The principal constituent of pyrex glass Zn B Pb Cl
2 The halide which is not hydrolysed is SiCl<sub>4</sub> SiF<sub>4</sub> CCl<sub>4</sub> PbCl<sub>4</sub>
3 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
4 Galena is an ore of Gallium Lead Tin Germanium
5 The substance used as a smoke screen in warfare is SiCl<sub>4</sub> PH<sub>3</sub> PCl<sub>5</sub> Acetylene
6 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.
7 Alum is not used As a mordant in dyeing As an insecticide In purification of water In tanning of leather
8 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>
9 In which of the following elements +1 oxidation state is more stable than +3 B Al ga Ti
10 Inert pair effect plays an important role in case of F Al Si Tl
11 Which metal is protected by a layer of its own oxide? Al Ag Au Fe
12 Which is the most amphoteric? Na<sub>2</sub>O MgO Al<sub>2</sub>O<sub>3</sub> CaO
13 Aluminothermy used for on the spot welding of large iron structure is based upon the fact that As compared to iron, aluminium has greater affinity for oxygen As compared to aluminium, iron has greater affinity for oxygen Refraction between aluminium and oxygen is endothermic Reaction between iron and oxygen is endothermic.
14 Which of the following mineral does not contain Al? Cryolite Mica Feldspar Fluorspar
15 Which one of the following has the lowest boiling point? B Al Ga Ti
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