List of top Chemistry Questions

Use the data from the table to estimate the enthalpy of formation of CH3CHO. 
 

Bond EnthalpyBondEnthalpy of Formation
400 kJ mol-1C–HC(g)    700 kJ mol-1
350 kJ mol-1C–CH(g)    200 kJ mol-1
700 kJ mol-1C=OO(g)    250 kJ mol-1

 

Identify the major product from the following reaction sequence:

Arrange the following in decreasing order of their boiling points:

Identify the product(s) formed in the following reaction:

Carbohydrates are stored in plants and animals in which of the following forms respectively?

Identify the major product of the following reaction:

The homonuclear complex in the following is:
Which compound is formed on catalytic hydrogenation of carbon monoxide at high pressure and temperature in presence of ZnO–Cr$_2$O$_3$ catalyst?

Identify the major product formed from the following reaction?

Glycylalanine is a dipeptide formed by the minimum instruction time. It is made up of which amino acids?
Assertion (A): 16th group elements have higher ionization enthalpy values than 15th group elements in the corresponding periods.
Reason (R): 15th group elements have half-filled stable electronic configuration.
Assertion (A): Fluorine has smaller negative electron gain enthalpy than chlorine.
Reason (R): The electron-electron repulsion is higher in chlorine than in fluorine.
Identify the isoelectronic pair of ions from the following

Match the following:

List -- I (Enzyme)List -- II (Reaction)
A.InvertaseI.Maltose → Glucose
B.PepsinII.Sucrose → Glucose + Fructose
C.DiastaseIII.Proteins → Peptides
 IV.Starch → Maltose
The rate constant of a reaction at 500 K and 700 K are 0.02 s$^{-1}$ and 0.2 s$^{-1}$ respectively. The activation energy of the reaction (in kJ mol$^{-1}$) is ($R = 8.3 \, \text{J K}^{-1} \text{mol}^{-1}$)
The correct order of coagulating power of the following ions to coagulate the positive sol is
I $[\text{Fe}(\text{CN})_6]^{4-}$, II $\text{Cl}^-$, III $\text{SO}_4^{2-}$
0.05 mole of a non-volatile solute is dissolved in 500 g of water. What is the depression in freezing point of the resultant solution? ($K_f(\text{H}_2\text{O}) = 1.86 \, \text{K kg mol}^{-1}$)
The gaseous mixture used for welding of metals is

The IUPAC name of the following compound is:

An element crystallizing in fcc lattice has the density of 8.92 g cm$^{-3}$ and edge length of 3.61$\times$10$^{-8}$ cm. What is the atomic weight of the element? (N=6.022$\times$10$^{23}$ mol$^{-1}$)
Which of the following is correct for fcc lattice?
96.5 amperes current is passed through the molten AlCl$_3$ for 100 seconds. The mass of aluminum deposited at the cathode is (Atomic weight of Al = 27 u)
Which of the following form an ideal solution?
Identify the species which does **not** exist:
Calcium carbide reacts with heavy water (D$_2$O) to form a compound $ X $ and Ca(OD)$_2$. What is the hybridization of carbon atom(s) in $ X $?