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Answers posted by meena.p
Questions
12710
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How many no. Of electron in sulphur can have m+l=3
answered
Nov 8, 2018
Solution : $_{16}S=1s^2,2s^2,2p^63s^2,3p^4$for $1s^2,n+1=1+0=1$for $2p^6,n+1=2+0=2$for $3s^2,n+1=3+0...
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votes
The resistance of 10.5 solution of an electrolyte in a cell was found to be
answered
Nov 8, 2018
Solution : $R= 45 \Omega$$\therefore G= s$$K_{cell}=\large\frac{1}{n}$$\qquad= \large\frac{22\;cm}{3...
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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
answered
Nov 1, 2018
Solution : $\qquad \qquad N_2O_4 \qquad \to \qquad 2 NO_2$Begining : a moles $\qquad \qquad$ 0 moles...
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Amines behave as
answered
Nov 1, 2018
Solution : A lewis base is a species which can donate one or more electron pairs. $NH_3$ acts as lew...
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What is the best description of the change that occurs when $Na_2O(s)$ is dissolved in water?
answered
Nov 1, 2018
Solution : In water Na2O" role="presentation" style="position: relative;">Na2ONa2ONa_2O dissociat...
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The equilibrium constant for the reaction $2SO_2(g)+O_2(g) \to 2SO_3(g)$ would be :
answered
Nov 1, 2018
Solution : Using the chemical reaction given above, we can rewrite the Equilibrium constant expressi...
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An organic compound contains 58.55%carbon,4.05%hydrogen and 11.36% nitrogen
answered
Oct 31, 2018
please check the question
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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:
answered
Oct 31, 2018
Solution: Equal amounts of reactants are poured into a suitable container. Given sufficient time, th...
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When pressure is applied to the given equilibrium ice water which of the following will happen
answered
Oct 31, 2018
Solution : If we increase pressure, equilibrium. will shift in the direction of less volume, hence ...
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The solution having zero PH will be
answered
Oct 31, 2018
Solution : A solution of a strong acid, such as hydrochloric acid, at concentration $1\; mol\; dm^{−
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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}$?
answered
Oct 30, 2018
Solution :All alkaline metal chlorides $(MCl_2)$ on hydrolysis will produce acidic solution$MCl_2+H_...
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$P^{H}$ of a soda water bottle is :
answered
Oct 29, 2018
Solution : $p^{H}=7+\large\frac{1}{2}$$(4.8-4.8)=7.0$
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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 ?
answered
Oct 29, 2018
Solution : $[H^{+}]$ ions concentrations are $10^{-11},10^{-12}$ and $10^{-13}$ on mixing equal volu...
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Which one of the following has the lowest $P^H$ value ?
answered
Oct 29, 2018
Solution : 0.1 MHCl means $[H^+]=10^{n} \; \therefore P^n =1$0.1 MKOH means $[OH^+]=10^{+} \; \there...
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$PH$ of a solution containing 50 mg of sodium hydroxide in $10\;dm^3$ of the solution is
answered
Oct 26, 2018
Solution : $P^{OH} =-\log (1.25 \times 10^{-4})$$\qquad= -0.0969 -4.0=3.9031$$p^{H} =14-3.9031 =10.0...
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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 ?
answered
Oct 26, 2018
Solution : $AglO \equiv Ag^{+}+IO^{-}$$K_{sp}=S^{2}$$\therefore S= (K_{sp})^{1/2}$$\qquad= 1 \times ...
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The aqueous solution of $HCOONa,C_6H_5NH_3Cl$and $KCN$ are respectively
answered
Oct 26, 2018
Solution : $HCOONa$ is a salt of weak acid $(HCOOH)$ and strong base $(NaOH)$ .So it basic $C_4H_5 N...
0
votes
Equilibrium solution of the following were prepared in water separately . Which one of the solutions will record the highest $P^{H}$?
answered
Oct 26, 2018
Solution : All alkaline metal chlorides $(MCl_2)$ on hydrolysis will produce acidic solution $MCl_2+...
0
votes
Number of $H^{+ ions}$ present in 500 ml of lemon juice of $P^{H}=3$ is
answered
Oct 26, 2018
Solution : $P^H= 3 means [H^+]=10^{-3}M$100 ml juice contanis $10^{-3}\;mole \;H^{+}$ ions$\qquad= 1...
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The dissociation constant of a substituted benzoic acid at $25C$ is $1.0 \times 10^{-4}$. The $p^{H}$ of $0.01\;M$ solution its sodium salt is
answered
Oct 26, 2018
Solution : $P^{H} =+\large\frac{1}{2}$$(P^kW+P^{k}a+\log C)$$\qquad= \large\frac{1}{2} $$\times 14 +...
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votes
The ionization constant of $NH_4OH$ is $1.77 \times 10^{-5}$ at $298\;K$ . Hydrolysis constant of it is
answered
Oct 26, 2018
Solution : $K_{b}=\large\frac{K_{w}}{K_{b}}$$\quad= \large\frac{1.0 \times 10^{-34}}{1.7 \times 10^{...
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votes
If $Ca(OH)_2$ is dissolved a solution of $NaOH$ its solubility , compared with that in pure water , is
answered
Oct 25, 2018
Solution : Because there already is a concentration of $(OH)^{-}$ ions from the NaOH in solution , t...
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votes
A change in which of these conditions will change the K of an equilibrium given as a starting point ?
answered
Oct 25, 2018
Solution : Only the changing of the temperature of the equilibrium reaction will change the K of the...
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votes
The PH of a solution that has a hydrogen ion concentration of $1 \times 10^{-4}\;mole/liter$ is
answered
Oct 25, 2018
Solution : Bcause the pH is defined as the negative of the log of the $H^+$ concentration, it is $-(...
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votes
If the $k_{sp}$ of radium sulfate , $RaSO_4$ is $4 \times 10^{-11}$, Calculate the solubility of the compound in pure water. Let x = moles of $RaSO_4$ that dissolve per liter of water. Then , in the saturated solution ,
answered
Oct 25, 2018
Solution : $[Ra^{2+}]=x mol/L$$[SO_4^{2-}]=x mol/L$$RaSO_4(s)= Ra^{2+}(aq)+SO_4^{2-}(aq)$Let $x= [Ra...
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votes
Silicon dioxide, made up of elements silicon and oxygen, contains 46.7% by mass of silicon. With what mass of oxygen will 10 g of silicon combine?
answered
Oct 25, 2018
Solution :100g of silicon dioxide contains 46.7 g of silicon, or 100 – 46.7 ( i.e. 53.3 g) of oxygen
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votes
In the Haber process for making ammonia , an increase in pressure favors
answered
Oct 25, 2018
Solution: In the reaction for the formation of ammonia $N_2+3H_2 \to 2H_3$
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A small value for K , the equilibrium constant , indicates that
answered
Oct 25, 2018
Solution :the concentration of the un-ionized molecules must be relatively large compared with the i...
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The PH of a solution that has a hydroxide ion concentration of $1 \times 10^{-4}$ moles /liter is
answered
Oct 25, 2018
Solution : $pH+pOH=14$ In this problem , the $pOH=-\log [OH]= -\log [10^{-4}]=(-4)=4$Placing this va...
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votes
The concentration in an expression of the equilibrium constant are given in
answered
Oct 24, 2018
Solution: The concentrations in an expression of the equilibrium constant are given in moles/liter (...
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votes
For the reaction $A+B =C+D$ , the equilibrium can be expressed as :
answered
Oct 24, 2018
Solution : The correct setup of $K_{eq}$ is the product of the concentration of the products over th...
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votes
The val ue of the equilibrium constant for the reaction :H2+I2=2HI at720K
answered
Oct 23, 2018
Solution : $\sqrt{48}=4 \sqrt{3}$$H_2(g)+I_2(g) \to 2HI(g) $ at $720^{\circ} K$[HI] means the concen...
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votes
The vapour pressure of a solution of urea is 736.2 mm at 100°c.calculate t
answered
Oct 23, 2018
Solution : $\large\frac{P_0 -P_1}{P_0}=\frac{760-736.2}{760}$$\qquad= 0.03132$$\qquad= \large\frac{m...
0
votes
Electrolysis of water is
answered
Oct 16, 2018
Solution : Photosynthesis is an Endothermic Reaction as heat is absorbed.
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A reaction for which heat must be removed from the system to maintain isothermal condition is called
answered
Oct 16, 2018
Solution : A reaction for which heat must be removed from the system to maintain isothermal conditio...
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votes
The energy of a system plus surrounding can neither be created nor destroyed, Is the law of
answered
Oct 16, 2018
Solution : The Conservation of Energy states that the energy of a system plus surrounding can neithe...
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votes
If the kg amount of both the reactants is doubled. What is the extent of the reaction?
answered
Oct 16, 2018
Solution : If we double the kg amount of reactant, we double the moles. The extent becomes double.
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If 5 moles of N2 is combined with 12 moles of $H_2$ as per given reaction. $N_2 + 3 H_2 → 2 NH_3$
answered
Oct 16, 2018
Solution : Extent of the reaction is = (5-1) / (1) = 4.
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votes
Extent of a reaction denotes
answered
Oct 16, 2018
Solution : It denotes that how much a reaction occurs.
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votes
Which one is not a dimension?
answered
Oct 16, 2018
Solution : Kelvin is a unit, not dimension.
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votes
How many significant figures are there in 0.002000?
answered
Oct 16, 2018
Solution : Zero after the point counts.
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Number of digits that are reasonably sure, called significant figures. Above given definition is
answered
Oct 16, 2018
Solution : Number of digits that are reasonably sure, called significant figures.
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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?
answered
Oct 16, 2018
Solution : Carbon tetrachloride and bromine combine to form dibromodichlormethane and chlorine gas.T...
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votes
Which of the following equations does NOT demonstrate the law of conservation of mass?
answered
Oct 16, 2018
Solution : The law of conservation of mass states that mass in an isolated system is neither created...
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votes
A __________________ chemical equation shows that the same numbers of atoms in the reactants are also in the product.
answered
Oct 16, 2018
Solution : A balanced chemical equation occurs when the number of the different atoms of elements in...
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votes
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?
answered
Oct 16, 2018
Solution : magnesium + hydrochloric acid - magnesium chloride + hydrogen Mg + HCl $\to$ MgCl2+HHence...
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votes
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?
answered
Oct 16, 2018
Solution : $Zn+2HCl \to ZnCl_2+2H$
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votes
In a chemical reaction, the mass of the products always __ the mass of the reactants.
answered
Oct 16, 2018
Solution : According to the Law of Conservation of Mass, mass cannot be created or destroyed.Therefo...
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votes
What is the theoretical percent of aluminum in aluminum oxide?
answered
Oct 16, 2018
Solution : $\% \;Al$ = (Atomic mass of Al / Formula mass of $Al_2O_3) \times 100$$\%\; Al = (54\; am...
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votes
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?
answered
Oct 16, 2018
Solution : 100g of silicon dioxide contains 46.7 g of silicon, or 100 – 46.7 ( i.e. 53.3 g) of ox
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