List of top Chemistry Questions

Which one of the following statements is not true in respect of properties of interhalogen compounds?
1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel. Which reactant is left in excess and how much? (At. wt. Mg = 24 ; O = 16)
Artificial sweetener which is stable under cold conditions only is
Which of the following hormones is produced under the condition of stress which stimulates glycogenolysis in the liver of human beings?
Identity Z in the sequence of reactions, $CH_3 CH_2 CH=CH_2 \xrightarrow{HBr/H_2 O_2}Y \xrightarrow{C_2H_5 ON_a}Z$
Calculate the energy in joule corresponding to light of wavelength 45 nm (Planck's constant, $h=6.63\times10^{-34}$ Js; speed of light, $c=3\times 10^{8}$.
$Be^{2+}$ is isoelectronic with which of the following ions?
Which of the following best define the term hyperconjugation?
Which of the following is the strongest base?
Valence electrons in the element A are 3 and that in element B are 6. Most probable compound formed from A and B is
The dominant factor in determining the IE of the elements on moving down the groups is
Which pair is different from the others?
The complex [Fe(H\(_2\)O)\(_5\)NO]\(^{2+}\) is formed in the ring test for nitrate ion. This complex is formed by charge transfer in which
Out of the following redox reactions, \[ \text{I. NH}_4\text{NO}_3 \xrightarrow{\Delta} \text{N}_2\text{O} + 2\text{H}_2\text{O} \] \[ \text{II. NH}_4\text{NO}_2 \xrightarrow{\Delta} \text{N}_2 + 2\text{H}_2\text{O} \] \[ \text{III. PCl}_5 \xrightarrow{\Delta} \text{PCl}_3 + \text{Cl}_2 \] Disproportionation is not shown in
Strongest conjugate base is
Baking powder is more commonly used to make cakes or bread “rise”. Filler in baking powder is
The activity of alkaline earth metals as reducing agent
Which of the following phosphorus is the most reactive?
Solid N$_2$O$_5$ is
(SiH$_3$)$_3$N is
If 200 mL of a 0.031 M solution of H$_2$SO$_4$ are added to 84 mL of a 0.150 M KOH solution, what is the pH of the resulting solution?
Raw milk sours in about 4 h at 27$^\circ$C, but in about 48 h in a refrigerator at 17$^\circ$C. What is the activation energy for souring of milk?
A certain radioactive isotope \( ^A_Z X \) (half-life = 10 days) decays to give \( ^{A-4}_{Z-2} X \). If 1.0 g of \( X \) is kept in a sealed vessel, find the volume of He accumulated at STP in 20 days. (Molar mass of \( ^A_Z X = 253 \))
If the osmotic pressure of a 0.010 M aqueous solution of sucrose at 27$^\circ$C is 0.25 atm, then the osmotic pressure of a 0.010 M aqueous solution of NaCl at 27$^\circ$C is
If in a solvent, $n$ simple molecules of solute combine to form an associated molecule, $\alpha$ is the degree of association, the van’t Hoff factor is equal to