One mole of CO₂ contains _______.

de Broglie equation is _______.

The highest ionization energy is exhibited by _____.

The axial overlap between the two orbitals leads to the formation of a: ______.

Which of the following is the correct mathematical relation for Charles law at constant pressure?

The process depicted by the equation.
H₂O (s) \(\rightarrow\) H₂O (l)
\(\Delta\)H = +1.43 kcal represents

A catalyst will increase the rate of a chemical reaction by ______.

In the ethylene molecule the two carbon atoms have the oxidation numbers.

On treatment of hard water with zeolite, sodium ions get exchanged with

When heated to 800^oC, NaNO₃ gives

Which of the following molecules have zero dipole moment?

The reaction

Which of the following is correct regarding the stability of carbocation?

The pollutant released in Bhopal gas tragedy was

Determine the empirical formula of an oxide of iron, which has 69.9% iron and 30.1% dioxygen by mass.

What designation is given to an orbital having n = 3, l =0?

In a period of the periodic table , gentrly the size of an atom decreases with in crease in atomic number but at the end of each period in noble gases, the atomic size in creases abuptly. Explain

Compressibility factor, Z of a gas is given as \(Z=\frac { pV }{ nRT } \) What is the value of Z an ideal gas?

Calculate the enthaly of formation of methane from the following data.
C(s)+O₂(g)\(\rightarrow \)CO₂(g);\(\Delta \)_rH^o = -393.5 KJ
2H₂(g)+O₂(g)\(\rightarrow \)2H₂O(l;)\(\Delta \)_rH^o = -571.8KJ
CH₄(g)+2O₂(g)\(\rightarrow \)CO₂(g) + 2H₂O(l);
\(\Delta \)_rH^o = -890.3 KJ

Calculate the pH of a solution formed by mixing equal volumes of two solutions A and B  of a respectively.

Classify as covalent, ionic or polymeric interstitial hydrides
RbH

What is the chemical formula of plaster of pairs ?Give its one use

What are fullerenes? why are they so called?

For testing halogens in an organic compound with AgNO₃ solution sodium extract (Lassaigne's test) is acidified with dilute HNO₃. What will happen if a student acidifies the extract with dilute H₂SO₄ in place of diluate HNO₃?

Write the structure of the alkene which on reductive ozonolysis gives butanone and ethanol.

How NO is depleting ozone layer?

Which of the following are isoelectronic species i.e., those having the same number of electrons?
Na⁺,K⁺,Mg²⁺,Ca²⁺,S^2-,Ar

Arrange the following as sated.
Increasing order of basic character ; mgO. SrO. K₂O, NiO, Cs₂O

What are the important characteristics of ionic compounds?

A discharge tube of 2 L capacity containing hydrogen gas was evacuated till the pressure inside is 1 x 10^-5 Pa pressure. If the tube is maintained at a temperature of 27^oC, calculate the number of hydrogen molecules still present in the tube.

1 mole of an ideal gas undergoes reversible isothermal expansion from an initial volume of \({ V }_{ 1 }\) to a final volume of \(10{ V }_{ 1 }\) and does 10kJ of work. The initial pressure was \(1\times 10^{ 7 }Pa.\) 
(i) Calculate \({ V }_{ 1 }\)
(ii) If there were 2 moles of gas, what must its temperature have been?

Nitric oxide reacts with Br₂ and gives nitrosyl bromide as per reaction given below:
\(2NO\left( g \right) +Br\left( g \right) \leftrightharpoons 2NOBr\left( g \right) \) 
When 0.087 mol of NO and 0.0437 mol of Br₂ are mixed in a closed container at constant temperature, 0.0518 mol of NOBr is obtained at equilibrium. Calculate equilibrium amount of NO and Br₂ .

Using the standard electrode potentials given in the Table , predict if the reaction between the following is feasible:
(a) Fe³⁺ (aq) and I^-(aq)
(b) Ag⁺(aq) and Cu(s)
(c) Fe³⁺(aq)and Cu(s)
(d) Ag(s) and Fe³⁺(aq)
(e) Br₂ (aq) and Fe²⁺(aq)

Can sodium bicarbonate make water hard?

When is a cation highly polarising? Which alkali metal cation has the highest polarising power?

Identify the compounds A, X and Z in the following reactions,
\(A+2HCI+5{ H }_{ 2 }O\rightarrow 2NaCl+X\)
\(X \ \xrightarrow [ \Delta ]{ 370K } HBO_{ 2 }\xrightarrow [ \Delta ]{ >370K } Z\)

Explain the following.
Kolbe's electrolytic method

(iii)What is the BOD value for the highly polluted water.

If the position of the electron is measured within an accuracy of + 0.002 nm, calculate the uncertainty in the momentum of the electron. Suppose the momentum of the electron is h/4π_m × 0.05 nm, is there any problem in defining this value.

How would you justify the presence of 18 elements in the 5^th period of the Periodic Table?

Write the resonance structures for SO₃, NO₂ and NO^-₃

A density of a gas is found to be 6.46 g dm^-3 at 25^o C and 5 bar pressure. What will be its density at STP?

Mr.sharma, who was a teacher,explained the second law of thermodynamics by giving example of car in which heat energy produced by the combusion of a fuel is not completely converted into mechanical work.He also explained the working of refrigerator on the basis of this law.
(i) State the second law of thermodynamics
(ii) why the energy produced by the combustion of a fuel in the car engine is not completely converted into mechanical work?
(iii)  could you explain the working of refrigerator on the basis of second law of thermodynamics?
(iv) What values are associated with Mr.Sharma?

A mixture of 1.57 mol of N₂, 1.92 mol of H₂ and 8.13 mol of NH₃ is introduced into a 20 L reaction vessel at 500 K. At this temperature, the equilibrium constant, Kc for the reaction, \({ N }_{ 2 }\left( g \right) +3{ H }_{ 2 }\left( g \right) \rightleftharpoons 2{ NH }_{ 3 }\left( g \right) \) is \(1.7\times { 10 }^{ 2 }\) . Is the reaction mixture at equilibrium? If not, what is the direction of the net reaction?

In India, there is the shortage of drinking water. Thus, projects like rainwater harvesting are used by Green Park Association to increase the amount of underground water. Rainwater is the almost pure form of water after the heavy shower as it is, in fact, the distilled water. The first shower contains dissolved gases from the atmosphere. Being a good solvent, when it flows on the surface of the earth, it dissolves many salts in the form of hydrogen carbonate, chloride and sulphate in water which make it hard Write the disadvantage of hard water?

Discuss the various reactions that occur in the Solvay process.

Diamond is covalent, yet it has high melting point, why?

Which of the following compounds will show cis-trans isomerism?
CH₂= CBr₂

The density of the water at room temperature is 0.1 g / mL. How many molecules are there in a drop of water if its volume is 0.05 mL?

Describe the experiment with the help of which charge on a electron is calculated.

The amount of energy released when one million of atoms of iodine in vapour state are converted to I- ions is \(4.9\times { 10 }^{ -13 }J \)  according to the reaction:
\(I(g)+{ e }^{ - }\rightarrow { I }^{ - }(9g)\)
Express the electron gain enthalpy of iodine in terms of KJmol^-1 and eV per atom.

What is the type of hybridisation of carbon atoms marked with star?

Nitrogen molecule(N₂ )has radius of about 0.2 nm. Assuming that nitrogen molecule is spherical in shape, calculate the percentage of empty space in one mole of N₂ gas at STP.

An athlete is given 100g of glucose of energy equivalent to 1560 kJ. He utilises 50% of this gained energy in the event.In order to avoid storage of energy in the body, calculate the weight of water that would need to perspire.The enthalpy of vaporisation of water is 44 kJ mol^-1.

What is the pH of 0.001M aniline solution? The ionization constant of aniline can be taken from Table . Calculate the degree of ionization of aniline in the solution. Also calculate the ionization constant of the conjugate acid of aniline.

(ii)calculate the oxidation number of sulphur in S₂ O₈^2- ion

Can we use concentrated sulphuric acid and pure zinc in the preparation of dihydrogen?
Write the chemical reactions to show the amphoteric nature of water. Why is hydrogen peroxide stored in wax-lined plastic coloured bottles?

i. Arrange th efollowing in the oder og property
BaCl₂, MgCl₂ , BeCl₂, CaCl₂ increasing ionic charecter
ii. Mention the main constraction of poratland cement?

Write suitable chemical equations to show their nature.

(a) What is Lassaigne's extract? Will NaCN give a positive Lassaigne's test for nitrogen?
(b) Which colour will appear in the Lassaigne's test if the compound contains both nitrogen and sulphur.
(c) Why is Lassaigne's extract prepared in distilled water? Can we detect oxygen in a compound by Lassaigne's test?

Discuss the preparation of alkanes by Wurtz reaction. What is the limitation of the reaction?

What are the reactions involved for ozone layer depletion in the stratosphere?