Recent questions in Chemistry

If, in the reaction $N_2O_4 \equiv 2NO_2$, x is that part of $N_2O_4$ which dissociates, then the number of molecules at equilibrium will be

asked Nov 1, 2018 by meena.p

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Amines behave as

asked Nov 1, 2018 by meena.p

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What is the best description of the change that occurs when $Na_2O(s)$ is dissolved in water?

asked Nov 1, 2018 by meena.p

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The equilibrium constant for the reaction $2SO_2(g)+O_2(g) \to 2SO_3(g)$ would be :

asked Nov 1, 2018 by meena.p

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Equal amounts of reactants are poured into a suitable container. Given sufficient time, the reactants may be converted almost entirely to products if:

asked Oct 31, 2018 by meena.p

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When pressure is applied to the given equilibrium ice water which of the following will happen

asked Oct 31, 2018 by meena.p

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The solution having zero PH will be

asked Oct 31, 2018 by meena.p

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Equilibrium solution of the following were prepared in water separately . Which one of the solutions will record the highest $P^{H}$?

asked Oct 30, 2018 by meena.p

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$P^{H}$ of a soda water bottle is :

asked Oct 29, 2018 by meena.p

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Equal volumes of three basic solutions of 11,12 and 13 are mixed in a vesel. What will be the concentration in the mixture ?

asked Oct 29, 2018 by meena.p

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Equal volumes of three basic solutions of 11,12 and 13 are mixed in a vesel. What will be the concentration in the mixture ?

asked Oct 29, 2018 by meena.p

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Which one of the following has the lowest $P^H$ value ?

asked Oct 29, 2018 by meena.p

1 answer

$PH$ of a solution containing 50 mg of sodium hydroxide in $10\;dm^3$ of the solution is

asked Oct 26, 2018 by meena.p

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$K_{sp}$ of $AglO_3$ is $1 \times 10^{4}$ at a given temperature what is the mass of $AglO_3$ in 100 ml of its saturated solution ?

asked Oct 26, 2018 by meena.p

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The aqueous solution of $HCOONa,C_6H_5NH_3Cl$and $KCN$ are respectively

asked Oct 26, 2018 by meena.p

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Equilibrium solution of the following were prepared in water separately . Which one of the solutions will record the highest $P^{H}$?

asked Oct 26, 2018 by meena.p

1 answer

Number of $H^{+ ions}$ present in 500 ml of lemon juice of $P^{H}=3$ is

asked Oct 26, 2018 by meena.p

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The dissociation constant of a substituted benzoic acid at $25C$ is $1.0 \times 10^{-4}$. The $p^{H}$ of $0.01\;M$ solution its sodium salt is

asked Oct 26, 2018 by meena.p

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The ionization constant of $NH_4OH$ is $1.77 \times 10^{-5}$ at $298\;K$ . Hydrolysis constant of it is

asked Oct 26, 2018 by meena.p

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If $Ca(OH)_2$ is dissolved a solution of $NaOH$ its solubility , compared with that in pure water , is

asked Oct 25, 2018 by meena.p

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A change in which of these conditions will change the K of an equilibrium given as a starting point ?

asked Oct 25, 2018 by meena.p

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The PH of a solution that has a hydrogen ion concentration of $1 \times 10^{-4}\;mole/liter$ is

asked Oct 25, 2018 by meena.p

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If the $k_{sp}$ of radium sulfate , $RaSO_4$ is $4 \times 10^{-11}$, Calculate the solubility of the compound in pure water. Let x = moles of $RaSO_4$ that dissolve per liter of water. Then , in the saturated solution ,

asked Oct 25, 2018 by meena.p

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Silicon dioxide, made up of elements silicon and oxygen, contains 46.7% by mass of silicon. With what mass of oxygen will 10 g of silicon combine?

asked Oct 25, 2018 by meena.p

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In the Haber process for making ammonia , an increase in pressure favors

asked Oct 25, 2018 by meena.p

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A small value for K , the equilibrium constant , indicates that

asked Oct 25, 2018 by meena.p

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The PH of a solution that has a hydroxide ion concentration of $1 \times 10^{-4}$ moles /liter is

asked Oct 25, 2018 by meena.p

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The concentration in an expression of the equilibrium constant are given in

asked Oct 24, 2018 by meena.p

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For the reaction $A+B =C+D$ , the equilibrium can be expressed as :

asked Oct 24, 2018 by meena.p

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Electrolysis of water is

asked Oct 16, 2018 by meena.p

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A reaction for which heat must be removed from the system to maintain isothermal condition is called

asked Oct 16, 2018 by meena.p

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The energy of a system plus surrounding can neither be created nor destroyed, Is the law of

asked Oct 16, 2018 by meena.p

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If the kg amount of both the reactants is doubled. What is the extent of the reaction?

asked Oct 16, 2018 by meena.p

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If 5 moles of N2 is combined with 12 moles of $H_2$ as per given reaction. $N_2 + 3 H_2 → 2 NH_3$

asked Oct 16, 2018 by meena.p

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Extent of a reaction denotes

asked Oct 16, 2018 by meena.p

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Which one is not a dimension?

asked Oct 16, 2018 by meena.p

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How many significant figures are there in 0.002000?

asked Oct 16, 2018 by meena.p

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Number of digits that are reasonably sure, called significant figures. Above given definition is

asked Oct 16, 2018 by meena.p

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A student combines 154 grams of carbon tetrachloride and an unknown quantity of bromine in a sealed container to produce 243 grams of dibromodichlormethane and 71 grams of chlorine. How much Bromine was used in the reaction, assuming the reactants are completely used up?

asked Oct 16, 2018 by meena.p

1 answer

Which of the following equations does NOT demonstrate the law of conservation of mass?

asked Oct 16, 2018 by meena.p

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A __________________ chemical equation shows that the same numbers of atoms in the reactants are also in the product.

asked Oct 16, 2018 by meena.p

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The following word equation describes a chemical reaction in which hydrogen is produced. magnesium + hydrochloric acid - magnesium chloride + hydrogen What is the source of the atoms in the hydrogen gas produced by this reaction?

asked Oct 16, 2018 by meena.p

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Examine the following chemical equation, which shows only the reactions and one product. $Zn + 2HCl - ZnCl_2 + ?$ How many H atoms must be present in the second product that is formed?

asked Oct 16, 2018 by meena.p

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In a chemical reaction, the mass of the products always __ the mass of the reactants.

asked Oct 16, 2018 by meena.p

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What is the theoretical percent of aluminum in aluminum oxide?

asked Oct 16, 2018 by meena.p

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Silicon dioxide, made up of elements silicon and oxygen, contains 46.7% by mass of silicon. With what mass of oxygen will 10 g of silicon combine?

asked Oct 16, 2018 by meena.p

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A thin strip of iron with a mass of 15.5g is placed into a solution containing 21.0g of copper (II) sulfate and copper begins to form. After some times, the reactions stops because all the copper (II) sulfate has reacted. The iron strip is found to have a mass of 8.5g. The mass of copper formed is found to be 8.60g. What mass of iron (II) sulfate has been formed in the reaction?

asked Oct 16, 2018 by meena.p

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In a chemical reaction 150 g Baking soda mixture containing sodium bicarbonate and vinegar on heating gives 87 g of carbon dioxide gas. What mass of solid residue will left in food?

asked Oct 15, 2018 by meena.p

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Which of the following statements best defines the law of conservation of mass?

asked Oct 15, 2018 by meena.p

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Calculate the number of moles of ammonium sulphate present in 15.84 kg of it. (H=1, N=14, O=16, S=32)

asked Oct 15, 2018 by meena.p

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