Chemistry Test 07 October

Match the IUPAC names of the elements with their actual names.

The oxidation state and covalency of Al in [AlCl(H₂O)₅]²⁺ are

The wavelength of violet light having frequency 750 tera hertz will be _________ nm.

Calculate energy (in KJ) of ten moles of photons of radiation whose frequency is 5 ×10¹⁴ Hz. Round up to 4 significant figure.

If K.E. of an electron is is 3.0×10^–25 J, calculate its wavelength in nm to nearest integer.

A golf ball has a mass of 40g, and a speed of 45 m/s. If the speed can be measured within accuracy of 2%, calculate the uncertainty in the position (in \(10^{-35}\) m). Answer to be in nearest integer.

The product of total number of angular nodes and radial nodes in 6f orbital is ___.

Arrange the 2s orbitals of following elements in increasing order of their energies

What is the wavelength (in nm) of light emitted when the electron in a hydrogen atom undergoes transition from an energy level with n = 4 to an energy level with n = 2? Answer should be in nearest integer.

What is the maximum number of emission lines when the excited electron of a H atom in n = 6 drops to the ground state?

A compound contains 4% hydrogen, 24.3% carbon and 71.7% chlorine. Its molar mass is 98.96 g. What is its molecular formula?

Calculate the molarity of NaOH in the solution prepared by dissolving its 8 g in enough water to form 50 mL of the solution. Answer should be in nearest integer.

The density of 3 M solution of NaCl is 1.25 g mL^-1. Calculate the molality of the solution to nearest integer.

How many significant figures are present in 236,000.

Round up 55978 up to four significant figures.

Dinitrogen and dihydrogen react with each other to produce ammonia. If 2 g of dinitrogen reacts with 1 g of dihydrogen, then the limiting reagent and its unreacted amount are:

What mass of 85% pure \(CaCO_3\) will be required to neutralize 50 mL of 0.5 M HCl solution according to the following reaction:
\(CaCO_3) (s) + 2HCl (aq) \rightarrow CaCl_2 (aq) + CO_2 (g) + H_2O (l) \)

An element Y has the following isotopic composition: \(^{200}Y\) = 90%, \(^{199}Y\) = 8.0 %, \(^{202}Y\) = 2.0 %. The weighted average atomic mass of the naturally occurring element Y is equal to

Arrange the following in the increasing order of their metallic character

The spin only magnetic moment of a divalent ion in aqueous solution (atomic number 29) is _______ BM. (Nearest integer)

If the Thompson model of the atom was correct, then the result of Rutherford’s gold foil experiment would have been :

Given below are two statements.
Statement I: According to Bohr’s model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in positive charges on the nucleus as there is no strong hold on the electron by the nucleus.
Statement II: According to Bohr’s model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in principal quantum number.
In the light of the above statements, choose the most appropriate answer from the options given below: