Which of the following is incorrect ?
In a multielectron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields?
(i) n = 1, l = 0, m = 0 (ii) n = 2, l = 0, m = 0
(iii) n = 2, l = 1, m = 1 (iv) n = 3, l = 2, m = 1
(v) n = 3, l = 2, m = 0
Decreasing order of size of various hybrid orbitals is
Which set of quantum numbers are not applicable to an electron ?
The energy of an electron of 2py orbital is
The de Broglie wavelength associated with particle is
The angular momentum of 3rd orbit is
Which one of the following has the highest value of ionic radius ?
Non directional orbital is
The bond length in , O2 , and follows the order
The shape of covalent molecule MX3 is
The rate of diffusion of hydrogen is about
At STP the order of root mean square speed of molecules H2, N2, O2 and HBr is
Two separate bulbs contain gas A and gas B. The density of a gas A is twice as that of B. The molecular mass of A is 1/2 as that of B. If temperature is constant, the ratio of the pressure of A and B is
A quantity of hydrogen gas occupies a volume of 30.0 mL at a certain temperature and pressure. What volume of half of this mass of hydrogen occupy at triple the absolute temperature if the pressure were one-ninth that of original gas ?
Oxygen and cyclopropane at partial pressure of 570 torr and 170 torr respectively are mixed in a gas cylinder. The ratio of the number of molecules of cyclopropane to the number of moles of oxygen is
x L N2 gas at STP contains 3 x 1022 molecules. The number of molecules in x L ozone at STP will be
4.0 g of argon has pressure P at temperature T K in a vessel. On keeping the sample at 500 higher temperature, 0.8 g gas was given out to maintain the pressure P. The original temperature was
What is the mass per cent of carbon in carbon dioxide ?
If the pressure of N2 /H2 mixture in a closed vessel is 100 atmosphere and 20% of the mixture then reacts, the pressure at the same temperature would be
1.35 g of pure Ca metal was quantitatively converted into 1.88 g of pure CaO. What is atomic weight of Ca?
Paramagnetism of oxygen is explained on the basis of the electronic configuration of
An element A is tetravalent and another element B is divalent. The formula of the compound formed from these elements will be
For three different gases values of van der Waals’ constant ‘a’ and ‘b’ are given. What is the correct order of liquefication of gases ?
Number of electrons in 1.8 mL of H2O is
Assuming fully decomposed, the volume of CO2 released at STP, on heating 9.85 g of BaCO3 (at. wt. of Ba = 137) will be
Find the rms speed of argon molecule at 270C (Molecular weight of argon = 40 gm/mol)
Molarity of H2SO4 (density 1.8 g/mL) is 18 M. The molality of this H2SO4 will be
Number of oxalic acid molecules in 100 mL of 0.02 N oxalic acid are
Number of ions present in 2.0 litre of a solution of 0.8 M K4[Fe(CN6)] is
The hybridization of carbon atoms in C-C single bond of CH ≡C-CH=CH2 is
The hybrid states of carbon in diamond, graphite and acetylene are respectively
In sp3d3 hybridization, which d-orbitals are involved?
Which of the following pairs is isoelectronic ?
How many unpaired electrons are present in ?
Which is not true in case of an ideal gas ?
The correct hybridization state of sulphur atom in SF2, SF4 and SF6 molecules is respectively
An atom has 2 electrons in K shell, 8 electrons in L shell and 6 electrons in M shell. the number of s electrons present in that element is
The correct order of increasing C - O bond lengths in CO, and CO2 is
The number of unpaired electrons in Cr3+ is
The correct order for electronegativty of halogens is
Which of the following is wrong statement ?
Which of the following spectral series of hydrogen atom lies in the far infrared region of electromagnetic radiation?
Alkaline earth metals