In which of the following the corrosion of iron will be most rapid? a.In pure water b.In pure oxygen c.In air and moisture d.In air and saline water

Answers 2

  1. d.In air and saline water

[tex]\pink{ \rule{0pt}{100000pt}}[/tex]

Answer:

the correct answer is se air and moisture because both react to the corrosion of the iron

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Which of the following is the odd one? A. 100+20+20+4 C. 900+60+60+4 D. 1400+80+80+4B. 400+40+40+4​

Answer:

D. 1400+80+80+4

Step-by-step explanation:

a. 144b. 484c. 1024d. 1564√144 = 12√484 = 22√1024 = 32√1564 = 39.5

D is odd one because others are perfect squares but this 1564 is not a perfect square.

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Hydrogen - Oxygen fuel cells are used in space craft to supply: a.power for heat and light b.electrical power c.oxygen d.water

power for heat and light

Answer:

water the correct answer is water because the formula of the water is H2O and hydrogen and oxygen combined to make H2O

At a certain temperature 2HI H2 + I2 only 50 a.0.25 b.0.3 c.0.5 d.1

Answer:

c is the correct answer of what is asking

Explanation:

Correct option is A)

2HI⇔H2 +I2

2 0 0 Initial concentration

2-2x x x At equilibrium

Since only 50% of HI is dissociated, thus

2x=1=>x=0.5

Now, from expression for equilibrium constant for the reaction we get,

Kc = x²/2–2x

=0.25

Which of the following is used as refrigerant? a.Solid CO 2 b.CHCl 3 c.SiC d.CF2Cl2

Explanation:

The correct option is D.

i.e CF2Cl2 as cholorflurocarbons were generally used as a refrigerant but as these gases lead to the depletion of ozone layer and have environmental issues therefore new refrigerants are developed and used now a days.

Answer:

CF2CI2 is used to refrigerant

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