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Answers posted by meena.clay6
Questions
2990
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If 18g of glucose is present in 1000g of solvent the solution is said to be
answered
Jan 11, 2019
Solution : Given mass of glucose $=18\;g$ Mass of solvent = 1000 g Molar mass of glucose = 180 g ...
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osmotic pressure of Urea solution is 500 mm of HG at 10 degree Celsius. the
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Jan 11, 2019
Solution : $i_{urea}=iC_{urea}RT_1$--------(1) & $i_{Solution } =iC_{solution } RT_2$--------...
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By how much would the oxidizing power of Mno4-/Mn2+ couple change if the H+
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Jan 11, 2019
Solution : We have reaction : $MnO_4^{-}+8H^{4} +5e^{-} \to mn^{+2} +2H_2O$ as we know $I O_...
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a water sample contain 9.5% MgCl2 and 11.7% NaCl by weight assuming 80% ion
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Jan 11, 2019
Solution : Moles of Nacl in 100 g of solution $= \large\frac{11.7}{58.5}$$=0.2$ Similarl...
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The density of a mixture of O2 and N2 at ntp is 1.3 gram per litre calculat
answered
Jan 11, 2019
Solution : Let 1 mole of the gas is present So 22.4L will be the volume of the mixture . Density...
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The latent heat of fusion of benzene is 30.25 cal/g. 0.0802 g of a substanc
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Jan 11, 2019
Solution : $L_f=30.26\;cal/g$ $w= 0.0802\;g$ $W_{C6H6}=13.03$ $\Delta T_f= 0.490$ $T_f=5.4^{\c...
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chemical composition of slag formed during the smelting process in the extr
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Jan 11, 2019
Solution : The roasting process removes volatile impurities like $As$ or $Sb$ from the one. The ...
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an element with molar mass 2.7 into 10 to the power minus 2 kg per mole for
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Jan 11, 2019
Solution : $Z= \large\frac{d \times a^3 \times N_A}{M}$ $d= 2.7 \times 10^{-3}\;kgm^{-3}=2.7\;g\;...
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How many mL of 0.1M HClare required to react completely with 1g mixture of
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Jan 11, 2019
Solution : Alkaline dilute solution of hydrogen peroxide as it helps in removing impurities. B...
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Derivation of the radius of the sphere inserted in an octahedral void in fc
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Jan 11, 2019
Solution : Applying pythagoras theroem $BC^2=AB^2+AC^2$ $(2R)^2+(R+r)^2+(R+r)^2=2(R+r)^2=> 4...
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Calculate the time required for 90% completion of a first order reaction wh
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Jan 11, 2019
For $50\%$ completion, t= 60 min $k=\large\frac{2.303}{60} \log \frac{a}{ a-x}$  ...
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An element A crystallizes in fcc structure. 200 g 0f this element has 4.12
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Jan 11, 2019
Solution : We have given that mass = 200 g density = 7.2 g $cm^{-3}$ $N_A=4.12 \times 10^{24}$...
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A Strong acid is same as concentrated acid. State true or false
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Jan 8, 2019
Solution : Concentration of an acid depends upon the water content whereas the strength of an acid d...
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Match the following with correct response. (1) Metal oxides (2) Non-metal oxides (3) Salts (4) Neutral Basses (A) Hydroxyl Irons (B) Acidic (C) basic (D) Hydroxyl Ions
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Jan 8, 2019
Solution : (a) 1-C, 2-B, 3-D, 4-A
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A beaker full of acid is added to a beaker full of base. The pH of the base will:
answered
Jan 8, 2019
Solution : A beaker full of acid is added to a beaker full of base. The pH of the base will decrease...
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A solution with a pH of 11 has a $H^{+}$ concentration of:
answered
Jan 8, 2019
Solution : To find the $H^{+}$ concentration when the pH is given, We need to use the following for...
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An unknown substance is added to a solution and the pH increases. The substance is:
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Jan 8, 2019
Solution : The unknown substance sould have to be a basic solution. At least more basic than the ini...
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Acids increase the concentration of what in water?
answered
Jan 8, 2019
Solution : Acids increase the concentration of hydrogen ion in water
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Match the following with correct response. (1) Sodium hydroxide (2) Potassium hydroxide (3) Calcium hydroxide (4) Lactic acid (A) Antacid (B) caustic soda (C) curd (D) caustic potash
answered
Jan 8, 2019
Solution :(a) 1-B, 2-D, 3-A, 4-C
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What will be the product when $HNO_3$ reacts with $NH_4OH$ ?
answered
Jan 8, 2019
Solution : the reaction takes place as follows:$HNO_3+NH_4OH \to NH_4NO_3+H_2O$
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Find the odd one out:
answered
Jan 8, 2019
Solution :$CuSO_4.5H_20$ is a hydrated salt. An example of acid salt is $NaHCO_3$
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Select the one which is neither an acid nor base
answered
Jan 8, 2019
Solution : $CH_3COOH$ and $CH_3OH$ are organic acids, HCl is strong acid and KCl is a salt.
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Select the one which is wrongly mapped
answered
Jan 8, 2019
Solution : calcium hydroxide is commonly referred as slaked lime.
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Identify the salt which contains both negative or positive ions.
answered
Jan 8, 2019
Solution : A double salt contains both negative or positive ions.
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Which acid is weak among mineral acids?
answered
Jan 8, 2019
Solution : Carbonic acid $(H_2CO_3)$ is a weak mineral acid.
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Which of the following statements are correct abount an aqueous solution of an acid and of a base? A. lower the pH weaker the base B. Lower the pH stronger the base C. higher the pH stronger the acid D. higher the pH weaker the acid
answered
Jan 8, 2019
Solution :A. lower the pH weaker the base D. higher the pH weaker the acid
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Which acid completely dissociates when dissolved in water?
answered
Jan 8, 2019
Solution : A strong acid ionizes completely when dissolved in water.
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What volume of $0.200 M NaOH(aq)$ is needed to neutralize $40.0\; mL$ of a $0.100\; M HCl(aq)$?
answered
Jan 8, 2019
Solution : $M_1V_1=M_2V_2$$0.2 *V_1=0.1 *40$$V_1=\frac{4}{0.20}=20 mL$
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According to the Bronsted-Lowry theory, a base can
answered
Jan 8, 2019
Solution : The Bronsted-Lowry theory doesn't go against the Arrhenius theory in any way - it just ad...
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votes
A substance is dissolved in water and the only positive ions in the solution are $H1^{+}$ ions. This substance is
answered
Jan 8, 2019
Solution : When $H_2SO_4$ is dissolved in water it dissociates to produce ions. The H+ ions react wi...
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votes
Find the pH of a 0.002 N acetic acid solution, if it is $2.3 \%$ ionised at a given dilution.
answered
Jan 8, 2019
Solution : Degree of dissociation, $\alpha = 2.3/100 = 0.023$Concentration of acetic acid, C = 0.002...
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The hydrogen ion concentration of a solution is 0.001 M. What will be the hydroxyl ion concentration of solution?
answered
Jan 8, 2019
Solution : We know that $[H^+][OH^{-}]1.0 \times 10^{-14}$So , $[OH^{-}]=1.0 *10^{-14}/[H^{+}]=(1*10...
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A liquid is considered an acid if it has a lot of __________.
answered
Jan 8, 2019
Solution:Whether a liquid is an acid or base depends on the type of ions in it. If it has a lot of h...
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votes
KOH is used in making of
answered
Jan 8, 2019
Solution : Potassium hydroxide is used in many of the same applications as sodium hydroxide. In addi...
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Name the substance that on treatment with chlorine yields bleaching powder.
answered
Jan 8, 2019
Solution : Calcium hydroxide is the substance that on treatment with chlorine yields bleaching powde...
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Zinc reacts with an acid as well as with a base to liberate hydrogen. On the basis of this what should be the nature of the zinc metal?
answered
Jan 8, 2019
Solution : An amphoteric compound is one that can react with both acids and bases.
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A student was asked to collect apparatus from lab store, for doing experiment of pH of given sample. Identify the article which he is not supposed to pick.
answered
Jan 8, 2019
Solution : Petri dish is not required for doing experiment of pH.
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The chemical formula of caustic potash is
answered
Jan 8, 2019
Solution : Potassium Hydroxide, commonly called caustic potash with formula KOH, is a caustic compou...
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votes
The pH of a solution with a hydrogen ion concentration of $1 \times 10^{-3}$ is
answered
Jan 8, 2019
Solution : Because the pH is defined as the negative of the log of the H+" role="presentation" style...
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votes
A substance Y turns phenolphthalein colorless. It will
answered
Jan 8, 2019
Solution : Y turns phenolphthalein colorless which means it is acidic medium. Thus, Y will vanish sm...
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votes
Which of the following statements are correct about an aqueous solution of an acid and of a base?
answered
Jan 8, 2019
Solution :(a) lower the pH weaker the base
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votes
Methyl orange is
answered
Jan 8, 2019
Solution : Methyl orange is a pH indicator frequently used in titration because of its clear and dis...
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votes
Which of the following is made up of bases?
answered
Jan 8, 2019
Solution : Antacid tablet, soap and toothpaste are made up of bases.
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Which of the following is a strong acid?
answered
Jan 8, 2019
Solution : Sulphuric acid ionizes completely when dissolved in water. Hence, it is a strong acid.
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Which acid completely dissociates when dissolved in water?
answered
Jan 8, 2019
Solution : A strong acid ionizes completely when dissolved in water.
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Which is a cause of acid precipitation?
answered
Jan 8, 2019
Solution : Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide...
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The soil is removed from the natural site, is treated with acid to leach the heavy metals out, then with a base to neutralize the soil and cause the heavy metals to precipitate out.” What process does this statement describe?
answered
Jan 8, 2019
Solution : Restoring soils contaminated with toxic mine waste
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What is the precipitate that sometimes forms during an acid-base neutralization?
answered
Jan 8, 2019
Solution :The neutralization that occurs when aqueous solutions of acids and bases are combined resu...
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PH of soils can be controlled through
answered
Jan 8, 2019
Solution : Neutralization of soil is sometimes necessary in order to promote plant growth. The abili...
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Which of the following is formed by the reaction of an acid with a base?
answered
Jan 8, 2019
Solution : A salt is formed during neutralization reaction.
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