Solubility of the alkaline earth's metal sulphates in water decrease in the sequence:-
Ca > Sr > Ba > Mg
Sr > Ca > Mg > Ba
Ba > Mg > Sr > Ca
Mg > Ca > Sr > Ba
The function of "Sodium pump" is a biological process operating in each and every cell of all animals. Which of the following biologically important ions is also a consituent of this pump:
A gas such as carbon monoxide would be most likely to obey the ideal gas law at:
High temperatures and low pressure.
Low temperatures and high pressure.
High temperatures and high pressure.
Low temperatures and low pressure.
The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence:
Ga < In < Al < Tl
Al < Ga < In < Tl
Tl < In < Ga < Al
In < Tl < Ga < Al
The variation of the boiling point of the hydrogen halides is in the order .
What explains the higher boiling point of hydrogen fluoride?
The electronegativity of fluourine is much higher than for other elements in the group
There is strong hydrogen bonding between HF molecules
The bond energy of HF molecules is greater than in other hydrogen halides.
The effect of nuclear shielding is much reduced in fluorine which polarises the HF molecule.
The enthalpy of the hydrogenation of these compounds will be in the order as:
The reaction of with HBr produces:
Which of the following pairs of ions are isoelectronic and isostructural?
The total number of -bond electrons in the following structure is:
The hybridization involved in complex is.(At.No.Ni=28)
In which of the following pairs, both the species are not isostructural?
Diamond, silicon carbide
Which of the following processes does not involve oxidation of iron?
Decolourization of blue solution by iron
Formation of from
Liberation of from steam by iron at high temperature
Rusting of iron sheets
Which is the correct order of increasing energy of the listed orbitals in the atom of titanium?
The number of -electrons in is not equal to the number of electrons in which one of th e following?
Which of these statements about is true?
has four unpaired electrons and will be in a low-spin configuration.
has four unpaired electrons and will be in a high spin configuration.
has no unpaired electrons and will be in a high-spin configuration.
has no unpaired electrons and will be in a low-spin configuration.
The sum of coordination number and oxidation number of the metal M in the complex (where is ethyenediamine) is:
The name of complex ion, is:
Hexacyanoiron (III) ion
Hexacyanitoferrate (III) ion
Tricyanoferrate (III) ion
Hexacyanidoferrate (III) ion
Number of possible isomers for the complex will be (en = ethylenediamine)
Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test of chloride ions with silver nitrate at ?
The formation of the oxide ion O2-(g), from oxygen atom requires first an exothermic and then an endothermic step as shown below:
Thus process of formation of in gas phase is unfavourable even though is isoelectronic with neon. It is due to the fact that
Electron repulsion outweighs the stability gained by achieving noble gas configuration
ion has comparatively smaller size than oxygen atom.
Oxygen is more electronegative.
Addition of electron in oxygen results in larger size of the ion.