List of top Chemistry Questions

$ CH\equiv \equiv CH\xrightarrow[{{H}_{2}}S{{O}_{4}}]{{{H}_{2}}O/H{{g}^{2+}}}X\xrightarrow{LiAl{{H}_{4}}}Y\xrightarrow{{{P}_{4}}/B{{r}_{2}}}Z, $ Here Z is:
Pi-bond (Ti-bond) is formed:
What is packing fraction of $ {}_{26}F{{e}^{56}} $ ? (At. mass = 55.92066)
Green vitriol is:
An element is in $ {{M}^{3+}} $ form. Its electronic configuration is $ [Ar]\,4{{s}^{1}} $ . What is the atomic number of element?
Milk is a colloid in which:
Which of the following has smallest size?
The number of neutrons in the element ${ }_{4} Be ^{9}$ is :
Zn convert it's melted state to its solid state, it has HCP structure, then find out nearest no. of nearest atom
In BCC, the distance between two nearest atoms will be 

In HS-,I-,R–NH2, NH3 order of proton excepting tendency will be :-

Enthalpy of CH4+\(\frac{1}{2}\)O2\(\rightarrow\)CH3OH is negative. If enthalpy of combustion of CH4 and CH3OH are x and y respectively. Then which relation is correct : -

Coordination number of Ni in [(C2O4)3]-4 is 

CH3-CH2-CH-CH3 obtained by chlorination of n-butane will be 
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                CI     

Which of following organometallic compound is \(\sigma\) and \(\pi\) bonded 

PbO2 \(\rightarrow\) PbO                            ∆G298< 0,

SnO2 \(\rightarrow\) SnO                            ∆G298 > 0,
Most probable oxidation state of Pb & Sn will be

Which statement is incorrect 

Which rays contain (+ Ve) charged particle 

Mn and Mp represet the mass of neutron and proton respectively. An element having mass M has N neutron and Z-protons, then the correct relation will be 

Which alkene on ozonolysis gives CH3CH2CHO and CH3CCH3

In X- H ----- Y, X and Y both are electronegative elements 
Standard electrode potentials for Fe electrode are given as $Fe^{2+}+2e^{-} \rightarrow Fe ; E^{o}=-0.44 V$ $Fe^{3+}+e^{-} \rightarrow Fe^{2+}; E^{o}=+0.77 V$ $ Fe^{2+}, Fe^{3+}$ and Fe blocks are kept together then
Change in enthalpy for reaction 2H2O2(l) → 2H2O(l) + O2(g) If heat of formation of H2O2(l) and H2O(l) are – 188 & – 286 KJ/mol respectively : -
When 1 mol gas is heated at constant volume temp. is raised from 298 to 308 K. Heat supplied to the gas is 500 J. Then which statement is correct : -
The coordination number of Fe(II) in oxyhaemoglobin is