List of top Chemistry Questions

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

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 : -

CH3-CH2-CH-CH3 obtained by chlorination of n-butane will be 
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PbO2 \(\rightarrow\) PbO                            ∆G298< 0,

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

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
One mole of fluorine is reacted with two moles of hot and concentrated KOH. The products formed are KF, $H_2O$ and $O_2$ The molar ratio of KF, $H_2O$ and $O_2$ respectively is
Which one of the following is a diamagnetic ion ?
A human body required the 0.01 Curie activity of radioactive susbtance after 24 hours. Half life of radioactive is 6 hours. Then max. activity of radioactive sustance that can be injected will be 

When a bio chemical reaction is carried out in laboratory out side the human body in the absence of enzyme, then the rate of reaction obtained is \(10^–6\) times, than activation energy of reaction in the presence of enzyme is

Solubility of a \(M_2S\) salt is \(3.5 \times 10^{–6}\) , then find out solubility product.

When a biochemical reaction is carried out in laboratory from outside of human body in the absence of enzyme, the rate of reaction obtained is $10^{-6}$ times, then activation energy of the reaction in the presence of enzyme is
A human body required the 0.01 M activity of radioactive substance after 24 h. Half-life of radioactive substance is 6 h. Then, injection of maximum activity of radioactive substance that can be injected will be
The beans are cooked earlier in pressure cooker, because
The correct acidic order of following is
Specific volume of cylindrical virus particle is $6.02 \times 10^{-2}$ cc/g, whose radius and length are $7 \mathring{A} \, and \, 10\mathring{A}$ respectively. If $N_A = 6.023 \times 10^{23},$ find molecular weight of virus.
obtained by chlorination of n-butane, will be
Which of the following is incorrect : -