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An unsaturated hydrocarbon ‘A’ adds two molecules of H2 and on reductive ozonolysis gives butane-1,4-dial, ethanal and propanone. Give the structure of ‘A’, write its IUPAC name and explain the reactions involved.
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Which of the following statements is wrong?
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Which of the following statements is correct?
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Ozone is a toxic gas and is a strong oxidising agent even then its presence in the stratosphere is very important. Explain what would happen if ozone from this region is completely removed?
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On the basis of chemical reactions involved, explain how do chlorofluorocarbons cause thinning of ozone layer in stratosphere.
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How is ozone produced in stratosphere?
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Ozone is a gas heavier than air. Why does ozone layer not settle down near the earth?
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Assertion (A): Ozone is destroyed by solar radiation in upper stratosphere.
Reason (R): Thinning of the ozone layer allows excessive UV radiations to reach the surface of earth.
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Indicate the σ and π bonds in the following molecule:
\[\ce{HCONHCH3}\]
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Pressure is determined as force per unit area of the surface. The SI unit of pressure, Pascal is as shown below:-
1Pa = 1N m–2
If mass of air at sea level is 1034 g cm–2, calculate the pressure in Pascal.
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What is the SI unit of mass? How is it defined?
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Write the atomic number of the element present in the third period and a seventeenth group of the periodic table.
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Use the periodic table to answer the following question.
Identify an element with five electrons in the outer subshell.
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Use the periodic table to answer the following question.
Identify an element that would tend to lose two electrons.
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Use the periodic table to answer the following question.
Identify an element that would tend to gain two electrons.
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Use the periodic table to answer the following question.
Identify the group having metal, non-metal, liquid as well as gas at room temperature.
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Assign the position of the element having an outer electronic configuration in the periodic table.
ns2 np4 for n = 3
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Assign the position of the element having an outer electronic configuration in the periodic table.
(n - 1)d2 ns2 for n = 4
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Assign the position of the element having an outer electronic configuration in the periodic table.
(n - 2) f7 (n - 1)d1 ns2 for n = 6
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Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom. Calculate the ionisation energy of sodium in kJ mol–1.
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