Chemistry Quiz

The most electropositive element is:

The outer electronic configuration of  K, Cu, and Cr are, respectively.

Which element exhibits both +1 or +3 oxidation states in its compounds?

Select the correct order of ionic radii

Which is the largest stable atom?

Europium belongs to:

The oxidation state of Cr in potassium dichromate and potassium chromate respectively, are:

Alkali metals in each period have:

Which gaseous ion in its ground state has the greatest number of unpaired electrons?

Identify the least stable ion amongst the following

The lanthanide contraction is responsible for the fact that:

Which of the following is the smallest cation?

Which of the following has lowest ionization enthalpy?

Which of the following has largest size

How many unpaired electrons are in a gaseous Fe2+ ion in its ground state?

Which property of an element is most dependent on the shielding effect?

Ionic radii are

Eka-aluminum and eka-silicon are known as:

An element having atomic number 56 belongs to which block?

An element of atomic number 29 belongs to

The most electronegative element is

Which of the following has the largest atomic size?

Which of the following has the largest radius?

The outer electronic configuration of most electronegative element is

All of the following are true with respect to carbonyls EXCEPT:

An electron is known to be in the n = 4 shell and the l = 2 subshell. How many possible combinations of quantum numbers could this electron have?

A metallic oxide contains 66% of the metal. The equivalent weight of the metal is

The specific heat of metal is 0.16, its approximate atomic weight would be

The equivalent weight of KMnO4 (in acid medium) is (At.wt.of K =39, Mn=55)

The hydrogen phosphate of certain metals has the formula MHPO4. The formula of metal chloride would be

Bassemerisation is  carried out for

Lead is mainly extracted by

Extraction of aluminum from bauxite ore reduction is carried out by

Rutile is separated from chalcopyrite by

The ore which is concentrated by wetting oil is

Haematite ore is concentrated by

Froth flotation process for the concentration of sulfide ores is an illustration of the practical application of

Three most occurring elements into the earth crust are

The metal which mainly occurs as oxide ore in nature is

Which one contains both Calcium and Magnesium

Natural refractory material used in furnaces is

The process of isolation of a metal by dissolving the ore in suitable reagent followed by precipitation of metal by a more electropositive metals is called

The percentage of P2O5 in diammonium phosphate (NH4)2HPO4 is

Born Haber cycle can be used to estimate

The hydration energy of Mg²+ ions is lesser than that of

Second electron gain enthalpy is

The second ionization potential of elements is higher than its second ionization potential because

The second ionization energy is maximum for

The ionization potential of Boron is less than that of Beryllium because

The period number and group number of Tantalum (z=73) are respectively

Which element is named after the name of a planet?

According to modern periodic law, the properties of elements repeat at regular intervals when elements are arranged in order of

Which of the following statements is incorrect about the adsorption theory?

Rusting of iron is an example  of

The type of corrosion that is very dangerous and difficult to monitor is

In galvanic series, Which metals are most passive?

Rusting of Iron is enhanced by

Dry corrosion is

Corrosion is accelerated by.....

which one of the following elements shows both positive and negative oxidation state?