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Forests cannot protect wildlife from the ill-effects of solar radiation.

Forest and wildlife are nonrenewable natural resources.

For which of the following reactions would the Ho for the reaction be labeled Delta H_(f)^(0) ?

For which of the following element, Mendeleev didn't left gap in his periodic table ?

For the redox reaction K_(2)Cr_(2)+XH_(2)SO_(4)+YSO_(2) rarr K_(2)SO_(4)+Cr_(2)(SO_(4))_(3)+ZH_(2)O What is the sum of x + y + z

For the reason: 2A (g) + B (g) rarr 2D(g), Delta U^(theta) = - 10.5 kJ and Delta S^(theta) = -44.1 JK^(-1) Calculate Delta rG^(@) for the reaction, and predict whether the reaction will occurs spontaneously.

For the reaction, CuO + H_(2) to Cu + H_(2)O, choose the correct statement.

For the reaction at 298K, 2A + B rarr C, Delta H = 400kJ mol^(-1), Delta S = 0.2 kJ K^(-1) mol^(-1). At what temperature will the reaction become spontaneous considering DeltaH and Delta S to be constant over the temperature range.

For the following reaction at 25^(@)C, DeltaH^(@) = + 115kJ and Delta S^(@) = +125J//K. Calculate DeltaG^(@) for the reaction at 25^(@)C SBr_(4) (g) rarr S(g) + 2Br_(2)(I)

For the extraction of iron, the blast furnace is charged with the mixture of ore, coke and limestone.(True / False)

For the chemical reaction to occur

For oxidation of iron, 4Fe(s) + 3O_(2)(g) rarr 2Fe_(2)O_(3) (s) entrop change is -549.4 J K^(-1)mol^(-1) at 298K. In spite of negative entropy change of this reaction, why is the reaction spontaneous? (Delta_(r ) H^(theta) for this reaction is -1648 kJ mol^(-1))

For making ornament 24 carat gold is used which is pure gold

For evaporation of water the sign of Delta H is …..and sign of Delta S is ……

For an element with atomic number 19, the 19th electron will occupy

General formula of alkenes is

For a reversible reaction, the activation energy of a forward reaction is 85 KJ/mol . The net reaction is assoicated with the release of 15 KJ/mol . What is the activation energyof the backward reaction ? Explain it on the bais of the collision theory ?

For a reaction A + B to C, the rate law is written as r=k[A]^(2)[B]. Doubling the concentration of 'A' without changing concentration of 'B' increases the rate of reaction by

For a reactionA + B to C , the rate law is written as r=k[A]^(2)[B] . Doubling the concentrations of both of 'A' and 'B' increases the rate of reaction by

Fora reaction A + B hArr C+D , if the activation energy of backward reaction is more than that of forward reaction, the forward reactionis

For a reaction 2A+ B to 2AB , it is found that doubling the concentration of both the reactants increases the rate to eight times that of initial rate butdoubling the concentration of B alone doubles the rate. Then the order of the reaction with respect to A and B is

For a given value of 'l' the total number of 'm' values is "____________"

For a gas phase reaction Cl_(2) + CHCl_(3) to HCl+ "CC"l_(4), the rate law is given as r=k[Cl_(2)]^(1//2) [CHCl_(3)] . Explain how the rate of reaction varies when the concentration of chlorine is doubled . Give units of rate constant

For a dibasic acid, normality is twice the molarity for a given solution

Foods kept at room temprature spoils faster than that kept in the refrigerator Why?

Food items should be stored in air tight closed containers.

Food materials can be protected from being rancid by keeping them in refrigerators.

Foodkept at roomtemperaturespoilsfasterthan thatkeptin refrierator. Givereason .

Food items on exposure to atmosphere become rancid due to the process of : (i) oxidation (ii) reduction (iii) corrosion (iv) hydrogenation

Food cans are coated with tin and not with zinc because.

Food cans are coated with tin and not with zinc because ...

Fly ash obtained from the burning of coal is used to make

Fly ash can be used to make _____

Flux + Gangue rightarrow ?

Write True/False: Fluorine cannot have +1 oxidation state.

Fluorine and chlorine becomenegativeions by _____________ .

Fluorine : 2, 7 :: Chlorine : _________

Flourine has more negative electron gain enthalpy than chlorine.(T/F)

Flint glass or optical glass contains

Five solutions A,B,C,D and E when tested universal indicator showed pH as 4,1,11,7 and 9 respectively . Which solution is (a) neutral (b) strongly alkaline ? (c) strongly acidic ? (d) weakly acidic ? (e) weakly alkaline ? Arrange the pH in increasing order of hydrogen ion concentration .

Five solutions A, B, C, D and E showed pH as 4, 7, 1, 11 and 9 respectively when tested with universal indicator. Which solution is (i) Neutral (ii) Strongly alkaline(iii) Strongly acidic (iv) Weakly acidic and (v) Weakly alkaline ? Arrange the pH in increasing order of hydrogen ion concentration.

First period : ShortestPeriod :: Sixth period :______________

Firstperiod containsonly one element

First ionisation enthalpy of Be is higher than B.(T/F)

First group : Alkali metals :: Second group : ___________

First and second ionisation energies of Be_((g)) are 900 kJ mol_(1)and 1750 kJmol_(1) approximately. Claculate approximate percentage of Be^(2+)_((g)) ions, if 1 g of Be_((g)) absorbs 150 kJ of energy [atomic weight of Be is 9].

Five solution A, B, C, D and E when tested with universal indicator showd pH as 4, 1, 11, 7 and 9 respectively. Which solution is (a) neutral ? (b) stongly alkaline ? (c ) strongly acidic ? (d) weakly acidic ? (e) weakly alkaline ? Arrange the pH in increasing order of hydrogen ion concentration.

Find the valency of the first twenty elements.