#CHEMISTRY
മുൻവർഷങ്ങളിൽ ആവർത്തിച്ച കെമിസ്ട്രി 70 ചോദ്യങ്ങൾ*
1. Which element has the lowest melting point?
Ans:- Helium
2. The element with the highest densi-111:
Ans:- Osmium
3. The lightest metal:
Ans:- Lithium
4. The element with the highest boiling point:
Ans:- Tungsten
5. The most abundant elements in the Sun in the correct order:
Ans:- H,He,O
6. Which element has the second highest density?
Ans:- Iridium
7. The most abundant metal in human body:
Ans:- Calcium
8. What percent of the atmosphere is Oxygen?
Ans:- 20.95
9. What percent of the mass of human body is Oxygen?
Ans:- 65
10. Select the correct order of abundance in the atmosphere:
Ans:- N,O,Ar,CO2
11. The most common element on the earth's crust by mass:
Ans:- Oxygen
12. The most abundant element in the moon:
Ans:- Oxygen
13. Which metal has the highest melting point?
Ans:- Tungsten
14. The most abundant metal in Earth:
Ans:- Iron
15. The element with atomic number 100:
Ans:- Fermium
16. Water has maximum density at __ degree Celsius:
Ans:- 4
17. The gas using for filling balloons:
Ans:- Helium
18. Beryllium aluminum silicate is known as:
Ans:- Emerald
19. The isotope using for radio carbon dating:
Ans:- Carbon-14
20. Which is not correctly matched?
Ans:- Helium-Chemical sun
21. The best non-metallic conductor of electricity:
Ans:- Graphite
22. The first Trans Uranic element:
Ans:- Neptunium
23. Most chemically reactive element?
Ans:- Flourine
24. The colour of sodium vapour lamp:
Ans:- Yellow
25. The essential constituent chlorophyll:
Ans:- Magnisium
26. The first to isolate aluminium from bauxite:
Ans:- Charles Martin Hall
27. The main constituent of bone:
Ans:- Calcium phosphate
28. Which is used for the vulcanisation of rubber:
Ans:- Sulpher
29. The most abundant inert gas:
Ans:- Argon
30. Which is known as the 'metal of future'?
Ans:- Titanium
31.Galvanisation is the process of coating of on other metals.
Ans:- Zinc
32. What is known as the ling of poi-sons'?
Ans:- Arsenic
33. What is used in fire works for red flame?
Ans:- Strontium
34. The first element that was produced artificially:
Ans:- Technitium
35. Chemical used for artificial rain:
Ans:- Silver iodide
36. The rarest metal:
Ans:- Rhodium
37. The best conductor of heat and electricity:
Ans:- Silver
38. The most electropositive stable element:
Ans:- Caesium
39. Barium imparts _ colour to flames:
Ans:- Green
40. What is known as 'little silver'?
Ans:- Platinum
41. What is used as an X ray radio contrast agent?
Ans:- Barium
42. Semi conductor used for making integrated circuits:
Ans:- Germanium.
43. Number of Hydrogen atoms in a water molecule:
Ans:- 2
44. The only substance in exists in nature in three three forms- solid, liquid and gas:
Ans:- Water
45. Atomic number of Carbon:
Ans:- 6
46. Which is known as 'universal sol-vent'?
Ans:- Water
47. The total number of natural elements:
Ans:- 92
48. The poisonous gas emited from the engines of two wheelers:
Ans:- Carbon Monoxide
49. Gas filled in the tyres of aeroplanes:
Ans:- Helium I
50. The pH value of water:
Ans:- 7
51. Element which is used in Torch cell:
Ans:- Zinc
52. Non metal element present in liq-uid state:
Ans:- Bromine
53. Purest form of water:
Ans:- Rain water
54. Water has minimum density at _ degree Celsius.
Ans:- 0
55. The most abundant salt in sea water:
Ans:- Sodium chloride
56. Colour of hydrogen gas:
Ans:- Colourless
57. Water is known as:
Ans:- Blue gold
58. Which is known as 'Chemical Sun'?
Ans:- Magnisium
59. Which is known as 'Yellow Cake'?
Ans:- Uranium oxide
60. Element formed during hydrogen bomb explosion:
Ans:- Helium
61. Which symbol is incorrect?
Ans:- Potassium-P
62. Ozone is a/an _:
Ans:- Element
63. Nucleon is:
Ans:- Neutron+Proton
64. Element present in DNA and RNA:
Ans:- Phosphorus
65. Element present in all explosives:
Ans:- Nitrogen
66. Ithai-Ithai disease is caused by:
Ans:- Cadmium
67. Which element. has the name with the meaning 'stranger'?
Ans:- Xenon
68. Sweetest natural sugar:
Ans:- Fructose
0 Comments