Answer:
Answer
Correct option is
A
9
pK
b
=−logK
b
=−log10
−5
=5
A mixture of ammonium hydroxide and ammonium chloride forms basic buffer solution.
The Hendrson's equation for he basic buffer solution is as given below.
pOH=pK
b
+log
[acid]
[salt]
Substitute values in the above expression.
pOH=5+log
0.1
0.1
=5
Hence, the pH of the solution is pH=14−pOH=14−5=9
Explanation:
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Answer:
Many insects are resistant to pesticides there are many factors that can lead to resistance in the organism.
In the population of mosquitoes some of them carry resistant gene that makes the organism survive even in the presence of pesticide.
This occurs because of mutation that is very rare when it comes to insects. This is the reason that after sometime the mosquito become resistant to pesticides. They are more likely to breed and survive.
Answer:
The heat absorbed is hence 10.751.21 J
Explanation:
The heat absorbed when 88g of water is heated from 5.8°C to 35 °C is;
Heat = m c ΔT
m = 88.0 g
c = specific heat of water = 4.184 J/g°C
ΔT = ( change in temperature) = ( 35 - 5.8)°C = 29.2°C
Equating these values into the formula, we obtain;
Heat = 88* 4.184 * 29.2
Heat = 10 751.2064 J
Heat = 10 751.21 J (2 d.p)
The heat absorbed is hence 10.751.21 J
Answer: Option (c) is the correct answer.
Explanation:
Boiling point is the temperature at which vapor pressure of a liquid becomes equal to the atmospheric pressure.
More strong interactions present in the atoms of a compound more heat is required to break it. Hence, greater will be its boiling point.
In
there will be strong dipole-dipole interactions because this compound has hydrogen bonding. Whereas in
there is no hydrogen bonding taking place.
Hence,
will have weak interactions as compared to
. And, neon being a noble gas is stable in nature and does not react easily. Hence, it will have low boiling point.
Thus, we can conclude that given substances are placed in order of increasing boiling point as follows.
Ne <
<