List of top Chemistry Questions

Veronal is used as a/an
How many total constituent particles are present in simple cubic unit cell ?
The number of $\sigma$ and $\pi$-bonds in $2$-formylbenzoic acid are respectively
How many isomers are possible for an alkane having molecular formula $C_{5}H_{12}$?
In the reaction, $ H_{2}O_{2} (aq) \ce{->[I^{-}(aq)]} H_{2}O(I)+\frac{1}{2} O_{2}(g)$ iodide ion acts as
Which of the following salts is coloured salt before heating?
The metal d-orbitals that are directly facing the ligands in $ {K_3[Co(CN)_6]}$ are :
The correct order of acid strength of the following carboxylic acids is
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion: Glucose does not give 2,4-DNP test. 
Reason: Glucose exists in cyclic hemiacetal form.
In the light of the above statements, choose the correct answer from the options given below
$ {B2H6}$ reacts with $ {(CH3)3N}$ to produce
Match the column I and II
Column IColumn II
(i)Elaioplast(a)Storage of starch
(ii)Aleuroplast(b)Storage of fat
(iii)Amyloplast(c)Storage of protein
(iv)Chromoplast(d)Colored pigments
Calculate Molarity of a 63% w/w $HNO_3$ solution if density is 5.4 g/mL :
The Henry�s law constant for $O_2$ dissolved in water is $4.34 \times 10^4$ atm at certain temperature. If the partial pressure of $O_2$ in a gas mixture that is in equilibrium with water is 0.434 atm, what is the mole fraction of $O_2$ in the solution?
Formula for half life of a zero order reaction is:
In the decay sequence, ${^{238}_{92}U->[-x_1] ^{234}_{90}Th->[-x_2] ^{234}_{91}Pa ->[-x_3]^{234}Z->[^{-x_4}] ^{230}_{90}Th}$ $x_1,x_2, x_3$ and $x_4$ are particles/radiation emitted by the respective isotopes. The correct option(s) is(are)
The decomposition of $NH_3$ on platinum surface is zero order reaction. The rates of production of $N_2$ and $H_2$ are respectively $(k = 2.5 \times 10^{-4} mol\, L^{-1} s^{-1})$
The rate constants for a reaction at $400\, K$ and $500\, K$ are $2.60 \times 10^{-5} s ^{-1}$ and $2.60 \times 10^{-3} s ^{-1}$ respectively. The activation energy of the reaction in $kJ\, mol ^{-1}$ is
The hydroxyl ion concentration in a solution having $ pH $ value $ 3 $ will be
pH of a salt solution of wak acid (pKa = 4) & weak base (pKb = 5) at 25�C is :
Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is
Phenol + Aniline \(\xrightarrow[KOH]{C _6H_5N_2^+Cl}\:\) Major Product : Product will be :
The vapour density of a mixture containing $ {NO2}$ and $ {N2O4}$ is 38.3 at $ {27^{\circ}C}$. What will be the mole of $ {NO_2}$ in 100 mole mixture.

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion (A) : \(ZnO\) becomes yellow when it is heated.

Reason (R) : Metal excess defect arises due to excess of \(Zn^{2+}\) ions which move to interstitial sites and the electron moves to neighbouring interstitial sites.

In the light of the above statements, choose the correct answer from the options given below

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion (A) : LiCl is predominantly a covalent compound. 

Reason (R) : Electronegativity difference between Li and Cl is too small.

In the light of the above statements, choose the correct answer from the options given below

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion (A) : Nylon-6 is a condensation polymer. 

Reason (R) : It is a polymer of caprolactum.

In the light of the above statements, choose the correct answer from the options given below