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Give balanced equations to show the preparation of hydrogen by the following: alkali

Give an example of the law of constant proportion.

Give an example of (i) gas in liquid solution (ii) gas in gas solution.

Give an example each for the mixture having the following characteristics. (a) gases (b) Two volatile components (c ) Two immiscible liquids.

State the law of conservation of mass.

Give a common example of suspension.

Geometry of alpha-sulphur is ________________

Generally electron affinity values of elements decrease from top to bottom in a groupof non metallic element .However elements of 2nt period have lowerelectron affinity values than do the corresponding element of 3rdperiod .comment on this statement

General metallurgical process are given below. Arrange them in correct sequence. (1) conversion of ore to oxide. (2) refining (3) dressing of ore (4) extraction of metal (5) concentration of ore

Gaseous substance exerts pressure on the walls of the container.

Galliu is more electronegative of the elements decrease down the group .It is due to ______

From the symbol ""_(20)^(40)Ca, write electronic configuration and valence electrons.

From the list, given below, select the correct answers for [Isobars, Isotopes, Efflorescence, Hygroscopy, Charles's law, Boyle's law, Kelvin, Thermal dissociation, Thermal decomposition]. At constant temperature, the volume of a given mass of dry gas is inversely proportional to its pressure.

From the list, given below, select the correct answers for [Isobars, Isotopes, Efflorescence, Hygroscopy, Charles's law, Boyle's law, Kelvin, Thermal dissociation, Thermal decomposition]. Atoms of the same element having the same atomic number but different mass numbers.

From the list, given below, select the correct answers for [Isobars, Isotopes, Efflorescence, Hygroscopy, Charles's law, Boyle's law, Kelvin, Thermal dissociation, Thermal decomposition]. Decomposition of a compound by the action of heat, on cooling, original substance is formed.

From the given graph, arrange the following in an ascending order : 1. energy of the reactant 2. energy of the product 3. threshold energy 4. activation energy of the backward reaction 5. activation energy of the forward reaction

From the following statements Choose those applicable to covalent compounds. • Dissolves in organic compounds • Dissolves in water • High melting and boiling point. • Found in solid liquid and gaseous states. • Conducts electricity.

From hydrogen, sodium, zinc and argon select Element which burns in oxygen with a pop sound.

From a mixture of water and oilthe constituents can be separtedby usinga ……………..

From a mixture of sandand water constituents can beseparated by …………….

Fresh air is a pure substance .

Freonsreleased from air- conditioners rise up in air and interact with the ozone layer .

Fractional distillation is suitable for separation of miscible liquids with a boiling point difference of about 25 K or less. What part of fractional distillation apparatus makes it efficient and possess an advantageover a simple distillation process. Explain using a diagram.

Four students A,B,C and Dare asked to prepare colloidal solution .The following diagrams shown the preparation done by them .Name the student who will able to prepare colloidal solution.Write two properties of colloidal solutions.

Formation of a compound is always associated with energy changes .

For the symbol H,D and T tabulate three sub-atomic particles found in each of them.

For the symbol, H,D and T tabulate, three sub - atomic particles found in each of them

For the symbol H, D and T tabulate three subatomic particles found in each of them.

For the reaction PCl_(5) hArr PCl_(5)+Cl_(2), there is no effect of pressure.

For the reaction involving the formation of 1 mole fo water molecule from hydrogen and oxygen, the rate of rection with respect to reactants is given as

For the reaction H_(2)+I_(2) hArr 2HI, express the rate of reaction with respect to all reactants and products.

For the reaction, A+2B to 5C+3D the rate of formation of C is 0.06 mole/L/sec and final concentration of B is 0.04 mole//L^(-1) at 2 sec. Find out the initial concentration of B and also the change in concentration of B.

For the reaction 2X+3Y to 4Z + 6Q

For the hypothetical reaction 4A_((g))+5B_((g)) to 4C_((g))+6D_((g)), if the rate of reaction in terms of disappearance of A is -(Delta[A])/(Delta t), then write the rate expressions in terms of concentration of B, C and D.

For the formation of one mole of nitric oxide from its constituents rate of formation of nitric oxide is ______ the rate of consumption of one of the reactants

For the following statements, write True (T) or False (F). If the statement is false, correct the statement. (d) -26 is greater than -25.

For the equilibrium reaction, dissociation of calcium carbonate K_(c ) is equal to _____.

For the equilibrium, N_(2)+3H_(2) hArr 2NH_(3), if deuterium is introduced into the reaction mixture after equilibrium, the final composition of equilibrium mixture is

For fractional distillation, the difference in their boiling points should be _____ .

For every 10^(@)C rise in temperature, the rate of reaction is generally _____.

For any substance, why does the temperture remain constant during the change of state?

For any substance, why does the temperature remain constant during the change of state?

For an equilibrium, H_(2(g))+I_(2(g)) hArr 2HI((g)), if 'x' is the degree of dissociation at equilibrium, derive the value of K_(c ) for the given reaction. Also give K_(c ) for the equilibrium, if the reaction is started with 1 mole of hydrogen iodide.