List of top Chemistry Questions

In BCC, the distance between two nearest atoms will be

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

CH₃-CH₂-CH-CH₃obtained by chlorination of n-butane will be
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CI

Zn convert it's melted state to its solid state, it has HCP structure, then find out nearest no. of nearest atom

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

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 : -

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

Which alkene on ozonolysis gives CH₃CH₂CHO and

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.

PbO₂ $\rightarrow$ PbO ∆G₂₉₈< 0,

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

obtained by chlorination of n-butane, will be

Which of the following is incorrect : -

In preparation of alkene from alcohol using $ Al_2 O_3$, which is effective factor?

Which of the following compounds on boiling with $KMnO_4 $(alk.) and subsequent acidification will not give benzoic acid ?

Grignard reagent is not prepared in aqueous medium but it is prepared in ether medium because

How many moles of acidified $FeSO_4$ solution canbe completely oxidised by one mole of $KMnO_4$ ?

In the presence of cobalt chloride $(CoCl_2)$,bleaching powder decomposes to form....

Sodium hexametaphosphate is known as

Bond dissociation energies of HF, HCl,HBr follow the order..

The e.m.f. of a cell, whose half-cells are given below, is: $ M{{g}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Mg(s); $ $ E{}^\circ =-\,2.37\,\,V $ $ C{{u}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Cu(s); $ $ E{}^\circ =+\,0.34\,\,V $

What is the atomic number (Z) of the noble gasthat reacts with fluorine ?