Category - General Knowledge
Part - Chemistry
Question No. - 25
Time - 25 Minuts
1. What is the heaviest metal?
a) Tantalum
b) Osmium (Os)
c) Tungsten
d) Plutonium Pu
Ans- b) Osmium (Os), very dense transition metal in the platinum group, with a density of approximately 22.59 g/cm³.
2. What is the lightest metal?
a) Lithium
b) Sodium
c) Titanium
d) Beryllium
Ans- a) Lithium, very dense transition metal in the platinum group, with a density of approximately 0.53 kg/L.
3. What is the name of metal which is liquid at room temperature?
a) Calcium
b) Sodium
c) Mercury
d) Beryllium
Ans- c) Mercury.
4. What is the Hardest metal?
a) Tungsten
b) Chromium
c) Inconel
d) Osmium
Ans- a) Tungsten, around 8.5 on the Mohs scale.
5. Which metal has the highest resistivity among the common metals and alloys?
a) Titanium
b) Nichrome
c) Magnesium
d) Osmium
Ans- b) Nichrome.
6. Which metal has the highest thermal conductivity?
a) Silver
b) Copper
c) Magnesium
d) Aluminum
Ans- a) Silver.
7. Which metal has the highest electrical conductivity?
a) Silver
b) Copper
c) Magnesium
d) Aluminum
Ans- a) Silver.
8. What is the softest natural metal?
a) Indium
b) Rubidium
c) Potassium
d) Cesium
Ans- d) Cesium which is so soft at room temperature that its consistency is comparable to wax.
9. What is most radio active natural metal?
a) Francium
b) Uranium
c) Radium
d) Thorium
Ans- c) Radium.
10. How many elements in the world?
a) 115
b) 116
c) 117
d) 118
Ans- d) 118.
11. Who was created periodic table?
a) Aarchimedes
b) Dmitri Mendeleev
c) Lui Pascher
d) Albert Einstein
Ans- b) Dmitri Mendeleev in 1869
12. When was main international organization for chemistry is the International Union of Pure and Applied Chemistry (IUPAC), founded?
a) 1917
b) 1918
c) 1919
d) 1920
Ans- c) 1919. Its headquarters are located in Research Triangle Park, North Carolina, United States.
13. What is the name of most inactive gas?
a) Helium
b) Neon
c) Krypton
d) Argon
Ans- a) Helium. .
14. Which gas is used in light bulb?
a) Helium
b) Neon
c) Krypton
d) Argon
Ans- d) Argon.
15. What is the name of most flammable gas?
a) Hydrogen
b) Propane
c) Methane
d) Helium
Ans- a) Hydrogen.
16. which gas is used in lpg for smell?
a) Helium
b) ethyl mercaptan
c) Krypton
d) Argon
Ans- b) ethyl mercaptan.
17. which gas is used in lpg?
a) Helium
b) Propane
c) Methane
d) Acetylene
Ans- b) Propane, LPG is mixture of Propane and Butane.
18. which gas is used in lighters?
a) Butane
b) Propane
c) Methane
d) Acetylene
Ans- a) Butane.
19. which the S.I unit of temperature is?
a) Centigrade
b) Kelvin
c) Celsius
d) Fahrenheit
Ans- b) Kelvin.
20. What have polyunaturated fats have?
a) Many double bond
b) One double bond
c) One single bond
d) One triple bond
Ans- a) Many double bond.
21. what is the chemical name of washing soda?
a) Sodium Phosphate
b) Sodium Peroxide
c) Modium Monoxide
d) Sodium Carbonate
Ans- d) Sodium Carbonate.
22. what is the farmula of "perl ash"?
a) N₂CO₃
b) L₂CO₃
c) K₂CO₃
d) P₂CO₃
Ans- c) K₂CO₃. its name is potassium carbonate.
23. Which acid is present in the human body?
a) H₂SO₃
b) H₂SO₄
c) HCl
d) H₂SO₅
Ans- c) HCl.
24. Whst is the lightest material in the world?
a) Aerogel
b) Aerographite
c) Aerographene
d) Sodium
Ans- c) Aerographene.
25. What is the coldest element?
a) Helium
b) Copper
c) Magnesium
d) Aluminum
Ans- a) Helium. it boils at -268.9 °C (-452 °F)