chemistry Question Bank - Sarthaks eConnect

Consider the following reaction

`(i) S(s)+O_2(g)->SO_2(g); triangleH=-297` KJ/mol

`(ii) S(s)+3/2O_2(g)->SO_3(g); triangleH=-396` KJ/ mol

`(iii) O_2(g)->20(g); triangleH=-495` KJ /mol

How would the reaction energies be added to get the reaction giving the S—O bond energy in `SO_3`

What is the mass of magnesium which completely reacts with 250 c`m^3` of 1.0 mol/d`m^3` sulphuric acid

In which of the following compounds the methylene hydrogens are most acidic

An organic compound of molecular fomrula, `C_8H_10O`, on reaction with iodine and sodium hydroxide gives a yellow precipitate. The most likely structure for the compound should be

Which one of the following reactions involves a 1, 3-dipolar addition as one of the steps in its mechanism

In the complexes `[Fe(H_2O)_6]^(3+), [Fe(CN)_6]^(3–), [Fe(C_2O_4)_3]^(3–)` and `[FeCl_6]^(3–)` more statbility is shown by

How is the product formed

The correct order of nucleophilicity is

Calculate the rate constant rate of Ist order reaction

`CH_3CHO(g)overset{Heat}{rightarrow} CH_4(g)+CO(g).`If the initial pressure of `CH_3CHO` is 80 mm and the total pressure at the end of 20 min is 120 mm

Metal-metal bonding is more frequent in 4d or 5d series than in 3d-series. This is because of

If the energy of electron in hydrogen atom is -3.4 eV then by neglecting the electronic spin what will be the degeneracy of this electron

Correct statement about `PCl_5, IF_7`, and `SF_6` is

A gaseous mixture contains hydrogen atoms in the 4^th excited state, `He^+` ions in 3^rd excited state and `Li^(2+)` in 2^nd excited state. The number of spectral lines obtained in the emission spectrum of this sample when all these atoms/ions return to the ground state is

9 moles of "D" and 14 moles of E are allowed to react in a closed vessel according to given reactions. Calculate number of moles of B formed in the end of reaction, if 4 moles of G are present in reaction vessel. (Percentage yield of reaction is mentioned in the reaction)

Step -1 `3D+4Eoverset{80%}{rightarrow} 5C+A`

Step -2 `3C+5G overset{50%}{rightarrow} 6B+F`

`SO_2Cl_2` (Sulphuryl chloride) reacts wits water given a mixture of `H_2SO_4` and HCl. What volume of 0.2 M Ba `(OH)_2` is needed to completely neutralize 25 mL of 0.2 M `SO_2Cl_2` solution:

For `H_2` gas the Vander waals equation reduces to

A substance 'A' decomposes in solution by following the first order kinetics. Flask I contains 1 L of 1 M solution of 'A' and flask II contains 100 ml of 0.6 M solution of ‘A’ After 8 hrs the concentration of 'A' in flask I become 0.25 M. What will be the time for concentration of ‘A’ in flask II to become 0.3 M?

The work done in an open container at 300 K, when 112 g of iron reacts with dil. HCl to from `FeCl_2` is (Value of R : 8.31 J mo`l^( -1)K^(-1)` or 2 cal mo`l ^(-1) K^(-1))`

A catalyst increases the rate of a reaction by:

The negative charge on `As_2S_3` sol is due to adsorption of

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