List of top Chemistry Questions on Periodicity of Elements asked in JEE Main

What are the products formed in sequence when excess of \(CO_2\) is passed in slaked lime ?
The number of non-ionisable hydrogen atoms present in the final product obtained from the hydrolysis of PCl\(_5\) is :
Given below are two statements:
Statement I: $\alpha$ and $\beta$ forms of sulphur can change reversibly between themselves with slow heating or slow cooling.
Statement II: At room temperature the stable crystalline form of sulphur is monoclinic sulphur.
Potassium permanganate on heating at 513 K gives a product which is :
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Barium carbonate is insoluble in water and is highly stable.
Reason (R) : The thermal stability of the carbonates increases with increasing cationic size.
Choose the most appropriate answer from the options given below :
The incorrect statement is :
The conversion of hydroxyapatite occurs due to presence of \(F^-\) ions in water. The correct formula of hydroxyapatite is :
The number of 4f electrons in the ground state electronic configuration of \(Gd^{2+}\) is _________. [Atomic number of Gd = 64] (Integer answer)
In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?
The number of water molecules in gypsum, dead burnt plaster and plaster of Paris, respectively are :
In polythionic acid, H\(_2\)S\(_x\)O\(_6\) (x = 3 to 5) the oxidation state(s) of sulphur is/are :
The number of \(f\) electrons in the ground state electronic configuration of Np (\(Z = 93\)) is _________. (Integer answer)
Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803 K ?
Which one of the following is used to remove most of plutonium from spent nuclear fuel ?
The addition of dilute NaOH to Cr\(^{3+}\) salt solution will give :
The major component/ingredient of Portland Cement is :

The number of halogen/(s) forming halic (V) acid is ____________
 

The correct order of bond dissociation enthalpy is:

Match List - I with List - II : 

Choose the most appropriate answer from the options given 
 

The oxidation states of 'P' in $H_4P_2O_7$, $H_4P_2O_5$ and $H_4P_2O_6$, respectively, are :
The correct statement about B$_2$H$_6$ is :
Among the following, the number of halide(s) which is/are inert to hydrolysis is ___________: (A) BF$_3$, (B) SiCl$_4$, (C) PCl$_5$, (D) SF$_6$
Number of amphoteric compounds among the following is _______. (A) BeO (B) BaO (C) $Be(OH)_2$ (D) $Sr(OH)_2$
Match List - I with List - II : List - I (a) Be (b) Mg (c) Ca (d) Ra List - II (i) treatment of cancer (ii) extraction of metals (iii) incendiary bombs and signals (iv) windows of X-ray tubes (v) bearings for motor engines. Choose the most appropriate answer from the option given below :
A xenon compound 'A' upon partial hydrolysis gives XeO₂F₂. The number of lone pair of electrons present in compound A is _________. (Round off to the Nearest Integer)