Chemistry - Study Mode
[#186] Silica gel is a
Correct Answer
(C) Drying agent
Explanation
Solution: Silica gel is a desiccant, or drying agent, that manufacturers often place in little packets to keep moisture from damaging certain food and commercial products. You may have seen silica packets in everything from beef jerky to the new shoes you bought.
[#187] Silicon is a
Correct Answer
(A) Semiconductor
Explanation
Solution: Silicon is a semiconductor.
[#188] Which type of fire extinguisher is used for petroleum fire ?
Correct Answer
(C) Powder type
Explanation
Solution: Powder type extinguisher is used for petroleum fire.
[#189] Man dies in the atmosphere of CO, because it
Correct Answer
(D) Combines with the haemoglobin of blood, thereby making the later incapable of absorbing O 2
Explanation
Solution: The preferential binding of carbon monoxide to iron severely limits the oxygen to bind to hemoglobin. As a result, less oxygen is carried through our system and we die.
[#190] It is dangerous to leave the car engine running in a closed garage, because it may cause serious pollution due to poisoning by emission of
Correct Answer
(B) CO
Explanation
Solution: The extremely high concentrations of carbon monoxide produced by an engine can raise CO concentrations in a closed building so quickly that a person may collapse before they even realize there is a problem. Carbon monoxide reduces the amount of oxygen to the brain, causing CO intoxication, and lack of reasoning.
Hence option D is correct answer.