Why is pure iron not used for bridges?A)too malleable B)too resistant to corrosion C)too conductive D)not shiny enough
A)too malleable
Oops!
Check
Okay!
Check
15
Which gas contributes to acid rain?
oxides of nitrogen(e.g:nitrogen dioxide) OR sulfur dioxide
Oops!
Check
Okay!
Check
seesaw
Swap points!
Oops!
rocket
Go to first place!
Okay!
rocket
Go to first place!
Okay!
thief
Give points!
5
10
15
20
25
15
Zinc granules give hydrogen gas when treated with dilute solution of:A)FeO B)HCl C)NaCl D)Ammonia
B) HCl
Oops!
Check
Okay!
Check
15
In the past, refrigerators, aerosol spray propellants and cleaning solvents were all sources of a greenhouse gas known as
CFC
Oops!
Check
Okay!
Check
15
Which reaction is used to keep the blast furnace hot?
Oops!
Show
Check
Okay!
Check
15
Covering iron with zinc is called ______________, and the zinc stops the iron from rusting.
galvanisation
Oops!
Check
Okay!
Check
15
What is the percentage of nitrogen in the atmosphere?
78%
Oops!
Check
Okay!
Check
15
Iron is made by burning its ore, hematite. Hematite contains silica. What reacts with this impurity to remove it?
Oops!
Show
Check
Okay!
Check
15
State 2 harmful effects of nitrogen oxides.
acid rain, photochemical smog, respiratory problem
Oops!
Check
Okay!
Check
15
Copper is sometimes used to make cooking utensils.3 of properties of copper are shown below: 1. Good conductor of electricity 2. Corrosion resistant 3. Good conductor of heat .Which of these properties make it good for cooking utensils?
2&3
Oops!
Check
Okay!
Check
heart
Other team wins 20 points!
Oops!
shark
Other team loses 20 points!
Okay!
rocket
Go to first place!
Okay!
banana
Go to last place!
Oops!
15
Most of metals which occur in their native state in nature:A)are very active B)do not form any compound C)are not reactive D)are moderately reactive
C)are not reactive
Oops!
Check
Okay!
Check
15
What is the chemical used to kill bacteria in water in the water treatment plant?
chlorine
Oops!
Check
Okay!
Check
15
Name a chemical that can be used to test the presence of water.
anhydrous copper(II) sulfate (white to blue) OR anhydrous cobalt(II) chloride(blue to pink)