62- Which of the following is not a bleaching agent?
A. Chlorine
B. Sulphur dioxide
C. Carbon dioxide
D. Sodium hypochlorite
View Answer
Answer : C. Carbon dioxide
Description
63- The gas usually filled in the electric bulb is:
A. Hydrogen
B. Oxygen
C. Nitrogen
D. Carbon dioxide
View Answer
Answer : C. Nitrogen
Description
64- Heavy water is:
A. Deuterium oxide
B. Tritium oxide
C. Rain water
D. Water at -4°C
View Answer
Answer : A. Deuterium oxide
Description
65- Ozone attacks:
A. Copper
B. Mercury and silver
C. Silver and iron
D. None of these
View Answer
Answer : B. Mercury and silver
Description
66- The gases used in different types of welding would include:
A. Oxygen and hydrogen
B. Oxygen, acetylene and argon
C. Oxygen and acetylene
D. Oxygen, hydrogen, acetylene and nitrogen
View Answer
Answer : C. Oxygen and acetylene
Description
67- Arrange the following metals in decreasing order of their relative abundance in earth’s crust after aluminum:
1. Calcium 2. Iron 3. Sodium 4. Magnesium
A. 1, 4, 2, 3
B. 1, 2, 4, 3
C. 2, 1, 3, 4
D. 2, 1, 4, 3
View Answer
Answer : A. 1, 4, 2, 3
Description
68- Which of the following alloys is used for making magnets?
A. Alnico
B. Duralumin
C. Magnalium
D. Stainless steel
View Answer
Answer : A. Alnico
Description
69- Permanent hardness of water may be removed by the addition of:
A. Alum
B. Sodium carbonate
C. Lime
D. Carbon dioxide
View Answer
Answer : B. Sodium carbonate
Description
70- Which of the following is the lightest gas?
A. Hydrogen
B. Nitrogen
C. Ammonia
D. Carbon dioxide
View Answer
Answer : A. Hydrogen
Description
71- Potassium nitrate is used in:
A. Salt
B. Glass
C. Medicine
D. Fertilizer
View Answer
Answer : D. Fertilizer
Description
72- In which type of rocks are metals like gold and copper mostly found?
A. New
B. Old igneous
C. Old metamorphic
D. Old sedimentary
View Answer
Answer : B. Old igneous
Description
73- Which of the following gases is lighter than air?
A. Chlorine
B. Ammonia
C. Oxygen
D. Carbon dioxide
View Answer
Answer : B. Ammonia
Description
74- Which of the following metals remains in liquid form under normal conditions?
A. Uranium
B. Radium
C. Titanium
D. Mercury
View Answer
Answer : D. Mercury
Description
75- Two or more forms of a chemical element having different physical properties but giving rise to identical chemical compounds are called:
A. Isotones
B. Isomers
C. Allotropes
D. Isotopes
View Answer
Answer : C. Allotropes
Description
76- Which of the following is not a compound?
A. Black lead
B. Slaked lime
C. Red lead
D. Silica
View Answer
Answer : A. Black lead
Description
77- Which of the following is used as a lubricant?
