A. Blue vitriol B. Green vitriol C Violet vitriol D. White vitriol
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A. Cast iron B. Wrought iron C. Steel D. Stainless steel
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A. Mercuric sulphide B. Mercurous sulphide C. Zinc sulphide D. Cadmium sulphide
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A. Calamine B. Pitch blende C. Cryolite D. None
A. Mixture of helium and oxygen B. Mixture of neon and oxygen C. Mixture of neon and nitrogen D. Mixture of argon and oxygen
A. Inertness B. High Polarisability C. Weak Ven der Walls’ forces between the atoms D. Small size
A. Xenon B. Helium C. Neon D. Argon
A. Argon B. Xenon C. Neon D. Helium
A. He B. Ne C. Ar D. Rn