WorksheetsAbhyaas 1.0
Total questions: 22
Worksheet time: 34mins
Which of the following sets of quantum numbers is not possible?
n-2,l-1, ml= 0, ms=-1/2
n-3,l-2, ml =-2, ms =+1/2
n-1,l-0, ml= -0, ms=+1/2
n-3,1=3, ml = +2, ms=-1/2
Which of the following is the correct definition of a mole?
The mass of one molecule of a substance in grams.
The number of molecules in one gram of a substance.
The amount of substance that contains as many entities (atoms, molecules, ions, etc) as there are in 12 grams of carbon-12.
The volume of one mole of a substance at standard temperature and pressure.
Assertion: Avogadro's law states that equal volumes of all gases at the same temperature and pressure contain equal numbers of molecules. Reason: The volume occupied by gas molecules is negligible compared to the total volume of the gas.
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.
(A) is false but (R) is true.
Assertion: Electronegativity increases across a period in the periodic table. Reason: Effective nuclear charge increases across a period.
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.
(A) is false but (R) is true.
Explain the following: a) Oxygen has lower ionization enthalpy than nitrogen. b) The electron gain enthalpy of fluorine is less negative than that of chlorine.
Aluminum reacts with chlorine gas to form aluminum chloride via the following reaction: 2Al + 3Cl2 --> 2AlCl3 (Molar mass of Al: 27g, Cl: 35.5g) a) Which is the limiting reagent? How many grams of aluminum chloride could be produced from 34.0 g of aluminum and 39.0 g of chlorine gas?
Empirical formula represents the simplest whole number ratio of various atoms present in a compound. a) Give the relation between empirical formula and molecular formula. b) An organic compound has the following percentage composition C= 12.36%, H = 2.13%, Br = 85%. Its vapour density is 94. Find its molecular formula.
Write the n and l values of a 4d electron.
Give the names of series of spectral lines of atomic hydrogen and their region in the electromagnetic spectrum. Write electronic configuration for Cu (At No:29) and Cr(At No 24).
State the dual behaviour of matter. A moving electron has a de Broglie wavelength of 7 x 10^-7 m. Calculate its kinetic energy. (Planck's constant = 6.626 x 10^-34 Js, mass of an electron = 9.1 x 10^-31 kg)
The dual behaviour of matter was proposed by French physicist de Broglie. Names of elements with atomic numbers greater than 100 are given by IUPAC. a) The atomic number of element with IUPAC name 'Ununbium' is b) Why is potassium considered as an s-block element? c) The first ionisation enthalpy of second period elements generally increase from left to right along the period. Give reason for this general trend.
Group 1 elements, known as alkali metals, are located in the first column of the periodic table. They have one valence electron, making them highly reactive and readily forming ions with a +1 charge. These metals are soft, have low melting points, and react vigorously with water to produce hydrogen gas and hydroxides. Questions: 1. Why alkali metals are reactive in nature? 2. Why do alkali metals become more reactive as you move down the group? 3. Write the electronic configuration of rubidium (Rb) (atomic Number: 37)
The arrangement of orbitals on the basis of energy is based upon their (n + l) value. Lower the value of (n + l), lower is the energy. For orbitals having the same values of (n + l), the orbital with lower value of n will have lower energy. I. Based upon the above information, arrange the following orbitals in the increasing order of energy: (a) 1s, 2s, 3s, 2p (b) 4s, 3s, 3p, 4d (c) 5p, 4d, 5d, 4f, 6s (d) 5f, 6d, 7s, 7p II. Based upon the above information, solve the questions given below: (a) Which of the following orbitals has the lowest energy? 4d, 4f, 5s, 5p (b) Which experience more effective nuclear charge, 4s or 4p? II) Identify the group and valency of the element having atomic number 119. Predict the outermost electronic configuration. Write the general formula of its oxide.
Assertion: Ionization energy generally increases across a period in the periodic table. Reason: Electrons are added to the same valence shell across a period.
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.
(A) is false but (R) is true.
Assertion: Boyle's law states that at constant temperature, the volume of a given mass of gas is inversely proportional to its pressure. Reason: The average kinetic energy of gas molecules is directly proportional to the temperature.
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.
(A) is false but (R) is true.
Which of the following sets of quantum numbers is not possible?
n=4, l=3, m=2, ms=-1
n=2, l=2, m=2, ms=+1
n=3, l=3, m=3, ms=-3
n=1, l=0, m=0, ms=0
Which of the following sets of quantum numbers is not possible?
n=5, l=4, m=3, ms=-2
n=2, l=1, m=1, ms=0
n=4, l=3, m=3, ms=-3
n=3, l=2, m=2, ms=2
Assertion: Charles's law states that the volume of a given mass of gas is directly proportional to its temperature at constant pressure. Reason: The pressure exerted by gas molecules is directly proportional to the temperature.
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.
(A) is false but (R) is true.
Assertion: The Pauli Exclusion Principle states that no two electrons in an atom can have the same set of four quantum numbers. Reason: Electrons in the same orbital must have opposite spins.
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.
(A) is false but (R) is true.
Assertion: The atomic radius generally decreases across a period in the periodic table. Reason: The effective nuclear charge increases across a period.
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.
(A) is false but (R) is true.
Which of the following is the correct definition of electronegativity?
The ability of an atom to attract electrons in a chemical bond.
The number of valence electrons in an atom.
The energy required to remove an electron from an atom.
The tendency of an atom to lose electrons.
Assertion: The boiling point of noble gases increases down the group in the periodic table. Reason: The atomic size of noble gases increases down the group.
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.
(A) is false but (R) is true.
