The compound in which mass percentage of carbon is 75% and that of hydrogen is 25% is _____________.

Based on equation E = \(-2.178\times { 10 }^{ -18 }J\left( \frac { { Z }^{ 2 } }{ { n }^{ 2 } } \right) \)certain conclusions are written. Which of them is not correct?

The first list of 23 chemical elements was published by _____ in the year 1789.

Volume strength of 1.5 N H₂O₂ is _____________

The reducing power of a metal depends on various factors. Suggest the factor. which makes Li, the strongest reducing agent in aqueous solution __________

Pick out the correct relation for 1 mole of real gas.

In an isothermal reversible compression of an ideal gas the sign of q, ΔS and w are respectively _______________

For the reaction AB (g) ⇌ A(g) + B(g), at equilibrium, AB is 20% dissociated at a total pressure of P, The equilibrium constant K_P is related to the total pressure by the expression __________

Assertion: An ideal solution obeys Raoults Law
Reason: In an ideal solution, solvent-solvent, as well as solute-solute interactions, are similar to solute-solvent interactions.
a) both assertion and reason are true and reason is the correct explanation of assertion
b) both assertion and reason are true but reason is not the correct explanation of assertion
c) assertion is true but reason is false
d) both assertion and reason are false

Which one of the following has pentagonal bipyramidal shape?

 are ____________

Statement - I : Heterolytic cleavage is unsymmetrical one.
Statement- II : A covalent bond breaks and one of the bonded atom retains the bond pair of electrons.

Statement - I: Alkenes are more reactive than alkanes.
Statement -II: Because of the presence of a double bond.

Which ofthe following halogen exchange reaction will occur in acetone?

Assertion (A) : Excessive use of chlorinated pesticide causes soil and water pollution.
Reason (R) : Such pesticides are non-biodegradable.
i) Both (A) and R are correct and (R) is the correct explanation of (A)
ii) Both (A) and R are correct and (R) is not the correct explanation of (A)
iii) Both (A) and R are not correct
iv) (A) is correct but( R) is not correct

Calculate the number of moles present in 60 g of ethane.

Which quantum number reveal information about the shape, energy, orientation and size of orbitals?

How is plaster of paris prepared ?

What is absolute zero? Mention its significance.

For the reaction, at 298K
 2A + B ⟶ C
ΔH = 400 KJ mol^-1, ΔS = 2 KJ mol^-1
At what temperature will the reaction become spontaneous, considering, ΔH and ΔS to be constant over the temperature range?

Write a balanced chemical equation for  equilibrium reaction for which the equilibrium constant is given by expression
\(K_c={[NH_3]^4[O_2]^5\over [NO]^4[H_2O]^6}\)

Explain the bond formation of hydrogen molecule.

0.30 g of a substance gives 0.88 g of carbon dioxide and 0.54 g of water calculate the percentage of carbon and hydrogen in it.

Explain the preparation of the following compounds
i) DDT
ii) Chloroform
iii) Biphenyl
iv) Chloropicrin
v) Freon-12

Calculate the oxidation number of nitrogen in nitrous acid and nitric acid

State and explain pauli exclusion principle.

In what period and group will an element with Z = 118 will be present?

Statues coated with white lead turn black on exposure to air. Its original colour is restored on treatment with H₂O₂ Explain.

Why sodium hydroxide is much more water soluble than chloride ?

What is compressibility factor? How does it explain the deviation of non ideal gases from ideal behaviour.

The equilibrium constant of a reaction is 10, what will be the sign of ΔG? Will this reaction be spontaneous?

If 5.6 g of KOH is present in
(a) 500 mL and
(b) 1 litre of solution 
Calculate the molarity of each of these solutions.

Carry over the following reaction mechanisms.
(i) Bromination of alkene
(ii) Addition of HCN to CH₃CHO
(iii) Formation of alkyl bromide with benzoyl peroxide as radical initiator.

An insecticide has the following percentage composition by mass: 47.5% C, 2.54% H, and 50.0% Cl. Determine its empirical formula and molecular formulae. Molar mass of the substance is 354.5g mol^-1

Determine the following for the fourth shell of an atom.
(a) The number of subshells
(b) The designation for each subshell
(c) The number of orbitals in each subshell
(d) The maximum number of electrons that can be contained in each subshell

Bring out the differences between electro negativity and electron affinity

A group-1 metal (A) which is present in common salt reacts with (B) to give compound (C) in which hydrogen is present in –1 oxidation state. (B) on reaction with a gas (C) to give universal solvent (D). The compound (D) on reacts with (A) to give (E), a strong base. Identify A, B, C, D and E. Explain the reactions.

State as to why
(a) Alkali metals show only +1 oxidation state.
(b) Na and K impart colour to the flame but Mg does not.
(c) Lithium on being heated in air mainly forms the monoxide and not the peroxide.
(d) Li is the best reducing agent in aqueous solution

Calculate the entropy change when 1 mole of ethanol is evaporated at 351 K The molar heat of vaporisation of ethanol is 39.84 kJ mol^-1.

What are the salient features of Valence Bond (VB) theory?

Give IUPAC names for the following compounds
CH₃ – CH = CH – CH = CH – C ≡ C – CH₃

Starting from methyl magnesium iodide how would you prepare
(i) Ethanol
(ii) 2-propanol
(iii) Tert-butyl alcohol

Differentiate the following
(i) BOD and COD
(ii) Viable and non-viable particulate pollutants