Chemistry Test 1- IIT JEE(Main) - Class 12 MCQ

If the dipole moment of C—Cl bond in the compound given below is 1.2 D.

Then the resulting value of the dipole moment in

Hybridisation of nitrogen I and II in the following compound is 

Which of the following do you think is the most important contributor to the resonance hybrid ?

The graph between energy and distance between atoms in the formation of a molecule is given as

The correct statement for the above graph is

Which of the following is paramagnetic ?

In the which can show intramolecular hydrogen bonding in solution ?

Which of the following sets has elements with identical covalent radius ?

Which of the following is correct ?

Which of the following is incorrect ?

Which of the following is pseudo nobel gas electronic configuration

Which of the correct graphical representation based on photoeletric effect ?

Ionic radius of Na⁺ is 0.95Å. The inter-ionic distance is 2.76Å. The ionic radius of Cl^– ion is

The value of D for the bonds A–B, A–C, A–D and A–E are 24.3, 50.6, 102.3 and 105.9 kJ mol^–1. Which of the following bond is most polar ?

The percentage of Fe³⁺ in Fe_0.93O_1.00 is

From 196 mg of H₂SO₄, 1.2046 x 10²¹ molecules are removed, number of molecules of H₂SO₄ left are

The specific heat of an element ‘X’ at constant volume is 0.082 and at constant pressure is 0.115. One litre of the gas at STP weighs 3.151 g. Calculate the approximate atomic weight of the element X.

4 moles of B combine with 1 mole of A to form a mole of ‘X’. [Atomic weight of A = 12, B = 35.5]. The equivalent weight of ‘X’ will be equal to

How much NaNO³ must be weighed out to make 50 ml of an aqueous solution containing 70 mg of Na⁺ per ml ?

10 ml of 1 N HCl is mixed with 20 ml of 1 M H₂SO₄ and 30 ml of 1 M NaOH. The resultant solution has

1 g alloy of Cu and Zn reacted with excess of dil. H₂SO₄ to give H₂ gas which occupies 60 ml at STP. The percentage of Zn in the alloy is

For a d-electron, the orbital angular momentum is

The radiations from a naturally occuring radioactive substance, as seen after deflection by a magnetic field in one direction, are

The energy of electron in first Bohr’s orbit of H-atom is –13.6 eV. The possible energy value(s) of excited state(s) for electron in Bohr’s orbit of He+ are

The probability distribution curve for 2s electron appears like

Arrange in decreasing order, the energy of 2s orbital in the following atoms H, Li, Na, K.

Comprehension based questions

Magnetic quantum number was introduced by Zeeman effect. It is denoted by ‘m’ and has the values between    It gives orientation of orbitals in space. When atom is placed in magnetic field its line splits into  spectral lines. Thus the total value of m =  each magnetic quantum number represents a separate atomic orbital within a sub-shell. Moreover it gives quantized values of z-component of angular momentum of electron in an orbital denoted by  L_z.

where θ = angle between z-axis and angular momentum vector

Q.

Total number of electrons present in a sub-orbit equal to

Comprehension based questions

Magnetic quantum number was introduced by Zeeman effect. It is denoted by ‘m’ and has the values between    It gives orientation of orbitals in space. When atom is placed in magnetic field its line splits into  spectral lines. Thus the total value of m =  each magnetic quantum number represents a separate atomic orbital within a sub-shell. Moreover it gives quantized values of z-component of angular momentum of electron in an orbital denoted by  L_z.

where θ = angle between z-axis and angular momentum vector

Q.

For which of the following orbital m = 0 in d-sub-orbit ?