Chemistry General Science Test Hard Mode

Sr. #	Questions	Answers Choice
1	Galena is an ore of	Gallium Lead Tin Germanium
2	The substance used as a smoke screen in warfare is	SiCI<sub>4</sub> PH<sub>3</sub> PCI<sub>5</sub> Acetylene
3	AI is more reactive than Fe but AI 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.
4	Alum is not used	As a mordant in dyeing As an insecticide In purification of water In tanning of leather
5	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>

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