Which of these metals is commonly used in tanning of leather?
[A] Phosphorous
[B] Indium
[C] Manganese
[D] Chromium

Which of these metals is most commonly used as control rods in the nuclear reactors?
[A] Platinum
[B] Cadmium
[C] Cobalt
[D] Silver

Which of these is the only metal that is liquid at ordinary room temperature and pressure?
[A] Copper
[B] Zinc
[C] Mercury
[D] Beryllium

Which of the following non-metal has an isotope which can be used to detect secret nuclear fuel reprocessing facilities?
[A] Selenium
[B] Tellurium
[C] Neon
[D] Krypton

Which of the following non-metals is used in the manufacturing of match sticks?
[A] Carbon
[B] Nitrogen
[C] Sulphur
[D] Phosphorous

Which of the following non-metal is used for bleaching woodpulp?
[A] Argon
[B] Chlorine
[C] Fluorine
[D] Gallium

Which of these non-metals is mainly used as an inert shielding gas?
[A] Xenon
[B] Hydrogen
[C] Argon
[D] Krypton

Which of these non-metals is commonly used in fire-crackers?
[A] Silicon
[B] Neon
[C] Sulphur
[D] Fluorine

Which of these gases is produced on addition of Baking soda to food items?
[A] Helium
[B] Hydrogen
[C] Carbon dioxide
[D] Nitrogen

Which of the following gas is responsible for burning of eyes when we cut an onion?
[A] Chlorine
[B] Helium
[C] Sulphur
[D] Methane

Which is the most abundant metal in the Earth’s crust?
[A] Iron
[B] Aluminium
[C] Copper
[D] Silicon