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⁞ Chemistry

General Science ➤ Chemistry ➤ 2
Question 31
Q31.  What is the probability of finding an electron at a point within an atom?
 

Answer :  proportional to the square of the orbital wave function


The probability of finding an electron at a point within an atom is proportional to the square of the orbital wave function i.e., |ψ|2 at that point. |ψ|2 is known as probability density and is always positive.
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Question 32
Q32.  What is the difference between the mass number of Parent nucleus and Daughter nucleus in an alpha-decay process?
 

Answer :  4


In α-decay, the mass number of the product nucleus (daughter nucleus) is four less than that of the decaying nucleus (parent nucleus), while the atomic number decreases by two.
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Question 33
Q33.  Which of the following factors affect the rate of chemical reaction?
 

Answer :  All of the above


The rate of reaction depends upon the experimental conditions such as concentration of reactants (pressure in case of gases), temperature and catalyst.
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Question 34
Q34.  What percent of Carbon is present in the earth’s crust?
 

Answer :  0.18%


Carbon is the 15th most abundant element in the earth’s crust with a percentage of 0.18%. Oxygen is the most abundant element at 46%, followed by silicon at 27% and aluminum at 8.1.
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Question 35
Q35.  Which of these polymers is produced by a condensation reaction between ethylene glycol and ortho-phthalic acid?
 

Answer :  Poly ethelene glycol phthalate


Poly ethelene glycol phthalate which is obtained by a condensation reaction between ethylene glycol and ortho-phthalic acid.
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