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Answers posted by meena.clay6
Questions
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votes
The Minnesota area has the following weather in $^{\circ}F$ . What is the difference between the high temperature average and the low temperature average over the three days ?
answered
Dec 17, 2018
Solution : Average high temperature $=\large\frac{76+80+1}{3}$$=75.67^{\circ}F$Average low temperatu...
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Emy travelled 120 miles on day 1, 115 miles on day 2 and 113 miles on day 3. How many miles per day did she travel on an average ?
answered
Dec 17, 2018
Solution : $\large\frac{120+115+113}{3}$$=116\;miles$
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The average of 4 consecutive even numbers is 40. What is the value of the least of the 4 numbers ?
answered
Dec 14, 2018
Solution : $\large\frac{x+x+2+x+4+x+6}{4}$$=40$=> $4x+12=160$=>$4x= 160-12=148$=> $4x=148$=...
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In a certain class there are 15 girls and 20 boys. If the average height of the girls is $x$ and average height of boy is $y$, what is the average height of all the boys and girls in the class ?
answered
Dec 13, 2018
Solution : $\large\frac{\sum X_g}{15}$$=x$ $\large\frac{\sum X_b}{20}$$=y$=>$\sum X_y=15x$=>$\...
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Mike takes 25 minutes to run around the track. He takes a second loop and it takes him 30 minutes. If the track is 10 miles long , what is his average speed in miles per hour ?
answered
Dec 13, 2018
Solution : 25 minutes $=\large\frac{25}{60}$ hours =$\large\frac{5}{12}$$hr$30 minutes $=\large\frac...
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The average of $x,y$ and $z$ is 9. If $x+y=20$ then $z$ is equals
answered
Dec 13, 2018
Solution : $\large\frac{x+y+z}{3}$$=9$$x+y+z=27$given $x+y=20$$20+z=27$$z=27-20=7$
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When a drop of an unknown solution X is placed on a strip of pH paper, a deep blue colour is produced . This solution should be
answered
Dec 13, 2018
Solution : NaOH of sodium Hydroxide as it is an alkali or a base. Only bases when tested on a pH sca...
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$MgO + 2HCl \to X + H_2O$
answered
Dec 13, 2018
Solution :$MgCl_2$ is the product formed when magnesium oxide reacts with hydrochloric acid and wate...
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votes
Select the one which is wrongly mapped
answered
Dec 13, 2018
Solution : calcium hydroxide is commonly referred as slaked lime.
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What is the pH of 0.0001 molar HCl solution?
answered
Dec 12, 2018
Solution : It has a H+ concentration of $10^{-4}$. The value of negative exponent$^{-4}$ gives pH va...
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votes
Which one will change from red litmus to blue?
answered
Dec 12, 2018
Solution : since HCl is a base it turns red litmus to blue.
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Find the odd one out
answered
Dec 12, 2018
Solution : $ CuSO_4.5H_20$ is a hydrated salt. An example of acid salt is $NaHCO_3$.
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A Strong acid is same as concentrated acid. State true or false
answered
Dec 12, 2018
Solution : Explanation: Concentration of an acid depends upon the water content whereas the strength...
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Which one is correctly matched?
answered
Dec 12, 2018
Solution : Acids have a pH range less than 7, Water is the only solvent that has a pH of 7 (neutral)...
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Which of the following when dissolved in water and placed in the conductivity apparatus would cause the light to glow?
answered
Dec 12, 2018
Solution : Table salt is the only substance listed that has ions when dissolved in its water solutio...
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The point at which a titration is complete is called the
answered
Dec 12, 2018
Solution : The point in a titration when the "unknown" solution has been neutralized-in the case of ...
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votes
A buffer solution
answered
Dec 12, 2018
Solution : A buffer solution resists the changes in pH.
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According to the Bronsted-Lowry Theory, an acid is
answered
Dec 12, 2018
Solution :By definition, a Bronsted-Lowry acid is a proton donor.
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The pH of a solution with a hydrogen ion concentration of $1 \times 10^{-3}$ is
answered
Dec 12, 2018
Solution : Because the pH is defined as the negative of the log of the $H^{+}$ concentration, it is ...
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Which pH is an acid solution?
answered
Dec 12, 2018
Solution : The pH scale is 0 to 14; the numbers below 7 are acid and those above 7 are increasingly...
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$H_2SO_4$ is a strong acid because it is
answered
Dec 12, 2018
Solution : $H_2SO_4$ is a strong acid because it is highly ionized.
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The hydronium ion is represented as
answered
Dec 12, 2018
Solution :The hydronium ion is written as $H_3O^{+}$
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The chemical formula of caustic potash is
answered
Dec 12, 2018
Solution : Potassium Hydroxide, commonly called caustic potash with formula KOH, is a caustic compou...
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The function of quick lime in soda lime mixture is to
answered
Dec 12, 2018
Solution : Soda lime, solid is generally a white to grayish white coloured solid. It is the mixture ...
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votes
Methyl orange is
answered
Dec 12, 2018
Solution : Methyl orange is a pH indicator frequently used in titration because of its clear and dis...
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votes
Which one of the following is acidic?
answered
Dec 12, 2018
Solution :The word acid from the Latin words acidus or acere, which mean "sour", since one of the ch...
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votes
At the boiling point of a liquid its ________ becomes equal to the atmospheric pressure.
answered
Dec 11, 2018
Solution :At the boiling point of a liquid its vapour pressure becomes equal to the atmospheric pres...
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The pH of pure water at $80^\circ C$ will be
answered
Dec 11, 2018
Solution :The value of $K_w$ increases with rise in temperature because dissociation of water is end...
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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
Dec 11, 2018
Solution : Equal amounts of reactants are poured into a suitable container. Given sufficient time, t...
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votes
$K_{sp}$ 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
Dec 11, 2018
SolutionAglO≡Ag++IO−" role="presentation" style="position: relative;">AglO≡
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votes
Number of $H^{+ ions}$ present in 500 ml of lemon juice of $P^{H}=3$ is
answered
Dec 11, 2018
Solution :$P^H= 3 means [H^+]=10^{-3}M$100 ml juice contanis $10^{-3}\;mole \;H^{+}$ ions$\qquad= 10...
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votes
A vessel contains $CO_2$ at $1000\;K$ temperature with pressure $0.5$ atm. Some of $CO_2$ is converted in to CO on addition of graphite . If total pressure at equilibrium is $0.8$ atm the value of $K_p$ is
answered
Dec 11, 2018
Solution : $CO_{2(g)}+C_{(g)} \rightleftharpoons 2CO_(g)$initial pressure 0.5 atm 0final pressure $=...
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votes
For the real gases 2CO+O2 gives 2CO2. dH is -560kJ. In a rigid vessel at 50
answered
Dec 10, 2018
$2Co_2(g)+O_2 \to 2CO_2(g)$ $\Delta H =-560\;kJ$ $\Delta H= \Delta V+W$ $-560= \Delta V+P \Delta ...
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votes
What is kc for the following equilibrium concentration of each substance is
answered
Dec 10, 2018
Solution : The equilibrium constant $(K_c)$ for the give reaction is :$K_c=\large\frac{[SO_3]^2}{[SO...
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votes
The rate of chemical reaction doubles for an increase of 10K in absolute t
answered
Dec 10, 2018
Solution : Given that initial temperature, $T_1 = 298\; K $ Final temperature, $T_2 ...
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A current of 9.65 amp.passing for 1000sec.through a molten tin salt deposit
answered
Dec 10, 2018
Solution : Eq.of.thin $\large\frac{i.t}{96500}$ $\large\frac{22.2}{E}=\frac{2 \times 5 \times 60 \...
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votes
$P^H$ of $0.1\;M$ Solution of weak acid is 3. The value of ionisation constant $Ka$ of acid is
answered
Nov 30, 2018
Solution :$P^H$ of $0.1\;M$ Solution of weak acid is 3. The value of ionisation constant $Ka$ of aci...
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votes
Three reaction involving $H_2PO_4$ are given below $(i)H_3PO_4+H_2O \rightleftharpoons H_3O^{+}+H_2PO_4^{-} \\ (ii)H_2PO_4+H_2O \rightleftharpoons HPO_{4}^{-2}+H_3^{+}O \\ (iii)H_2PO_4+OH \rightleftharpoons H_3PO_4+O^{2-}$ In which of the above does $H_2PO_4$ act as an acid
answered
Nov 30, 2018
Solution:According to lowry bronsted acid base theory in (ii) reaction $H_2PO_4$ donates $H^{+}$ion ...
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votes
Standard EMF of a galvaniv cell involving 2 electron transfer is 0.591 at 2
answered
Nov 28, 2018
Solution :Relation between $K_{eq}$ and $E_{cell}$$E_{cell}= \large\frac{2.303}{nF}$$\log K_{eq}$$E_...
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votes
A form ccp B atom present at the body centre C atom present at the centre o
answered
Nov 28, 2018
Solution : Atom A is shared by 8 corners 1atoms of C is shared by 4 unit cellsAtom B is present at c...
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votes
In a cubic lattice,A atoms occupy the corners,B atoms occupy all the face c
answered
Nov 28, 2018
Solution : Atom A is shaded by 8 corners 1atoms of C is shared by 4 unit cellsAtom B is present at c...
0
votes
The heat of combustion of CO at constant volume and at 290k is -283.5kJ. Ca
answered
Nov 28, 2018
Solution : No of moles of products =1No of moles of reactants = $1 \large\frac{1}{2}$Given that $\De...
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votes
What is the difference in pH for 1/3 and 2/3 stage of neutralisation of 0.1
answered
Nov 28, 2018
Solution : $CH_3COOH +NaOH \to CH_3COONa+H_2O$$pH=pK_a+\log \large\frac{1/3}{2/3}$-------(1)at 2/3 n...
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votes
if isotopic distrtibution of C12&C14 is 98%&2% respectively,then the no. of
answered
Nov 28, 2018
Solution : 14 g of carbon - 14 atom contains $=6.023 \times 10^{23} \;atom$1 g of carbon - 14 atom c...
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votes
The eqivalent weight of hypo in the reaction Na2s2o3+I2gives 2
answered
Nov 28, 2018
Solution : $2Na_2S_2O_3 + I_2 \to Na_2S_4O_6+2NaI $Oxidation of S in $S_2O_3=2$again $2s_2O_3 \to S_...
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votes
1.22 g of benzoic acid is dissolved in a)100 g of acetone (Kb = 2.6 K kg m
answered
Nov 28, 2018
Solution : $\Delta =kb * M$In first case,$\Delta Tb =Kb m=Kb$ wt. of solute/Molwt. of soluteOr $0.1...
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votes
caculate the K.E of the emitted electron if the wavelength of the incident
answered
Nov 28, 2018
Solution : Energy of photon $=\large\frac{hc}{\lambda}$$E= \large\frac{6.62 \times 10^{-34} \times 3...
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votes
The volume of 0.025M Ca(OH)2 solution which can neutralise 100mlof 10^-4 H3
answered
Nov 27, 2018
Solution: $3Ca(OH)_2 +2H_3PO_4 \to Ca_3(PO_4)_2+6H_2O$$\qquad= \large\frac{100}{1000}$$\times 0.0001...
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votes
The freezing point of solution containing 50 centimetre cube of Ethylene gl
answered
Nov 27, 2018
Solution : We have, volume of ethylene glycol$\qquad= 50 mL$$k'f =1.86\;k\;mol^{-1}\;kg$weight of wa...
0
votes
Magnetic moment 2.84 is given by(Atomic number N=28, Ti=22,Cr=24,Co=27)
answered
Nov 27, 2018
Solution : Magnetic moment , $\mu= \sqrt{n(n+2)}BM$ where,n = number of unpaired electrons $\mu =2.8...
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