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Answers posted by meena.p
Questions
12710
answers
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0
votes
Ions that do not participate in a chemical reaction are ____ ions
answered
Aug 21, 2018
Solution : A spectator ion is an ion that exists in the same form on both the reactant and product s...
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The activity series of metals is used to determine whether or not a ______ reaction has occurred.
answered
Aug 21, 2018
Solution : Double displacement reactions may be defined as the chemical reactions in which one compo...
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A reaction that has oxygen as a reactant and usually has carbon dioxide and water as products is a _____ reaction.
answered
Aug 21, 2018
Solution : A combustion reaction (commonly known as burning ) is an exothermic reaction in which som...
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According to the law of conservation of mass, the total mass of the reacting substances is
answered
Aug 21, 2018
Solution : According to the law of conservation of mass, themass of the products in a chemical react...
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Iron + Sulfur $\to$Iron sulfide $[Fe + S \to FeS]$ is an example of
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Aug 21, 2018
Solution : A combination reaction (also known as a synthesis reaction) is a reaction where two or mo...
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Acidic hazardous wastes are neutralised with slaked lime, caustic soda or sodium hydroxide.
answered
Aug 21, 2018
Solution : Alkaline hazardous wastes are neutralised with strong mineral acid such as Sulphuric acid...
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Common reagents for neutralising acid wastes are ____
answered
Aug 21, 2018
Solution : Acidic hazardous wastes are neutralised with slaked lime, caustic soda or sodium hydroxid...
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If an element M exit two isotope 50^M and 52 ^M it's average atomic mass is
answered
Aug 21, 2018
Solution : $wt=\large\frac{w_1x_1+w_2x_2}{x_1+x_2}$$51.7 =\large\frac{50 \times x_1+5 \times x_2}{x_...
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An optically active compound having molecular formula C7H15Br react with aq
answered
Aug 21, 2018
Solution : When optically alkyl undergoes $S_N1$ mechanism it is accompanied by racemisation because...
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The number of litres of air required to burn 8 litre C2H2 is approximately
answered
Aug 21, 2018
Solution : $2C_2H_2 + 5O_2 \to 4CO_2+2H_2O $and then $2n(C_2H_2)=5n(O_2)$$n=\large\frac{V}{V_m} $$2 ...
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In the figure given below $DE \parallel QR$ and $AP$ and $BP$ are bisectors of $\angle EAB$ and $\angle RBA$ . Then $\angle APB$ is equal to
answered
Aug 20, 2018
Solution : $\angle EAB+\angle RBA =180^{\circ}$$\large\frac{1}{2} \angle EAB+\large\frac{1}{2} \angl...
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Which of the below lines are parallel
answered
Aug 20, 2018
Solution : Sum of two interior angle should be $180^{\circ}$In fig(i) $132^{\circ}+48^{\circ}=180^{\...
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How many triangles can be drawn having its angles as $45^{\circ},64^{\circ}$ and $72^{\circ}$ ?
answered
Aug 20, 2018
$45^{\circ}+64^{\circ}+ 72^{\circ}=181^{\circ}$But the sum of angles in a triangle be $180^{\circ}$H...
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The value of $a$ for which the line $l$ and $m$ are parallel
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Aug 20, 2018
Solution : The sum of interior angles on the same side of the transversal is supplementary $\therefo...
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In the figure below $OP \parallel RS, \angle OPQ=110^{\circ}$ and $\angle QRS=130^{\circ}$ , then $ \angle PQR$ is equal to
answered
Aug 20, 2018
Solution : https://clay6.com/mpaimg/sat71.jpg$OP \parallel RS$ (given) and $RL$ is the transversal $...
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In $\Delta PQR, \angle R= \angle P$ and $QR=4 \;cm$ and $PR=5\;cm$ then the length of $PQ$ is
answered
Aug 20, 2018
Solution : given $\angle R= \angle P$=>QR= PQ$Since $QR=4\;cm,PQ=4\;cm$ https://clay6.com/mpaimg/...
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If ABC is a triangle and D is a point on BC such that AD bisects $\angle BAC$, then
answered
Aug 20, 2018
Solution : https://clay6.com/mpaimg/sat66.jpgSince AD bisects $\angle BAC$$\angle BAD =\angle CAD$$\...
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If ABC and PQR are triangles $AB= QR,BC=PR$ and $CA=PQ$ then
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Aug 20, 2018
Solution : $AB= QR,BC=PR=>\angle B= \angle R$$BC= PR,CA=PQ=>\angle C= \angle P$$CA= PQ,AB=QR=&...
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In $\Delta ABC,BC=AB$ if $\angle B=80^{\circ}$ than $\angle A=$
answered
Aug 20, 2018
Solution : In an isosceles triangle angles opposite to equal sides are equal side are equal. This i...
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Which of the following is not a criterion for congruence of triangle ?
answered
Aug 20, 2018
Solution : SSA criterion does not exists for Congresses of triangle . In $\Delta ABC,BC=AB$, if $\an...
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For what value $x+y$ will ABC be a straight line ?
answered
Aug 20, 2018
Solution : ∠ABC=x+y" role="presentation" style="position: relative;">∠ABC=x+y∠ABC=x+y\
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If one of the angle of a triangle is $130^{\circ}$, then the angle between the bisectors of the other two angles can be
answered
Aug 20, 2018
Solution : https://clay6.com/mpaimg/sat65.jpg$130^{\circ}+\angle B+\angle C=180^{\circ}$=> $\angl...
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The angles of a triangle are in the ratio $5:3:1$ the triangle is
answered
Aug 17, 2018
Solution : $5x+3x+x=180^{\circ}$$9x=180^{\circ}$$\therefore x=20^{\circ}$The angles are $100^{\circ}...
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The exterior angle of a triangle is $105^{\circ}$and its two interior opposite angles are equal. Each of the equal angle is
answered
Aug 17, 2018
Solution : Sum of two interior opposite angle is equal to one exterior angle. But the two angles $x+...
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votes
If one angle of a triangle is equal to the sum of the other two angles, then the triangle is
answered
Aug 17, 2018
Solution : $x+y+z=180^{\circ}$if $x=y+z$then , $2y+2z=180^{\circ}$$y+z=\large\frac{180^{\circ}}{2}$$...
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In the figure given above $AB \parallel CD \parallel EF \parallel $ and $PQ \parallel RS$. $\angle RQD=25^{\circ}$ and $\angle CQP=60^{\circ}$ then $\angle QRS$ is equal to
answered
Aug 17, 2018
Solution : $\angle BRS=60^{\circ}$$\therefore \angle ARS=120^{\circ}$$\angle ARQ=25^{\circ}$$\angle ...
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votes
Find the value of $x$ in the figure given below :
answered
Aug 17, 2018
Solution : https://clay6.com/mpaimg/sat63.jpgHence $2x+x=90^{\circ}$$3x=90^{\circ}$$x= 30^{\circ}$
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Two lines $l_1$ and $l_2$ are parallel to each other as shown , find the value of x+y
answered
Aug 17, 2018
Solution : https://clay6.com/mpaimg/sat61.jpg$\angle 1 +120^{\circ}+\angle 2 =180^{\circ}$$\angle x=...
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votes
If line $l_1$ is parallel to line $l_2$ , than $x^{\circ}=$
answered
Aug 17, 2018
Solution : https://clay6.com/mpaimg/sat60.jpg$x=43^{\circ}+36^{\circ}$$\qquad= 79^{\circ}$
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In the figure $\overline{AB} \parallel \overline{CD}$ and $\overline{AD}$ bisects $\angle CAB$, what is the measure of $\angle ADC$ ?
answered
Aug 17, 2018
Solution : $\angle CAB =80^{\circ}$(alternate interior angles)Since AD is angle bisector $\angle CAD...
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Glacial acetic acid , pure $HC_2H_2O_2(FW=60.0)$ has concentration of $17.54\;M$ . If $85.5\;mL$ of glacial acetic are diluted to 250 mL. What is the acetic acid concentration ?
answered
Aug 16, 2018
Solution : This is a dilution problem , use $M_1V_1=M_2V_2$$(17.54\;M) \times (85.5\;mL)=M_2(250\;mL...
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What happens when zinc reacts with sodium hydroxide?
answered
Aug 16, 2018
Solution : Zinc react with sodium hydroxide $Zn+2NaOH→Na2ZnO_2+H_2$Zinc react with sodium hydroxide
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If $0.050\;mL$ of $0.6\;M\;HCl$ is added to 400 mL of $10^{-5}\;M\;HCl$ what is the resulting pH?
answered
Aug 16, 2018
Solution : The added HCl is combined with the initial HCl to form a new strong add solution . total ...
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votes
What is the color of anhydrous copper sulphate?
answered
Aug 16, 2018
Solution : The color of anhydrous copper(II) sulphate is white when we remo...
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Phenolphthalein exhibits which color with an acid?
answered
Aug 16, 2018
Solution : Phenolphthalein exhibits a pink color in basic solutions and is colorless in acidic solut...
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votes
What happens when carbon dioxide gas reacts with sodium hydroxide?
answered
Aug 16, 2018
Solution : Solid sodium hydroxide reacts with carbon dioxide gas to form solid sodium carbonate and ...
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votes
How many ml of barium hydroxide is required to neutralize 55 ml of Nitric acid The concentration of the acid is 0.2585 moles/l and the concentration of the base is 0.047 moles / litre.
answered
Aug 16, 2018
Solution : Step 1: Write the balancing formula 2(HNO3)+Ba(OH)2→Ba(NO3)2+2H2O" role="pres...
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votes
What are the products of the following reaction? $H_2SO_4+NaOH$
answered
Aug 16, 2018
Solution : Sulfuric acid react with sodium hydroxide to produce sodium sulfate and water. Sulfuric a...
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votes
What volume of $0.075\; M \;HCl$ is required to neutralize $100\; ml$ of $0.01\; M\; Ca(OH)_2$ solution?
answered
Aug 16, 2018
Solution : HCl is a strong acid and will dissociate completely in water to $H^{+}$ and $Cl^{-}$. For...
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votes
What happens when sodium sulphate solution is mixed with the solution of barium chloride?
answered
Aug 16, 2018
Solution : Sodium sulphate chemically reacts with barium chloride in the form of their aqueous solut...
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The drying of milk of lime (white washing) is due to the action of ___________.
answered
Aug 16, 2018
Solution : An application of an alkali reacting with carbon dioxide is the drying of lime i.e. white...
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votes
Which substance completely dissociates in water?
answered
Aug 16, 2018
Solution : A strong acid is any acid that ionizes completely in solutions. This means it gives off t...
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votes
Neutral solutions have a pH of:
answered
Aug 16, 2018
Solution : Neutral pH is 7. An example of a neutral chemical is water.
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Which of the following combination reactions contains at least one compound in its reactants?
answered
Aug 16, 2018
Solution : $(a)\;CaO(a)+H_2O(l) \longrightarrow Ca(OH)_2 (aq) $
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The symbol for calcium is Ca, the symbol for sulfur is S, and the symbol for calcium sulfide CaS. Which of the following best describes this chemical reaction: $Ca (s) + S (s) \longrightarrow CaS (s)$?
answered
Aug 16, 2018
Solution : (b) Calcium combined with sulfur forms calcium sulfide.
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votes
A displacement reaction will occur when...
answered
Aug 16, 2018
Solution : Displacement reactions occur when a metal from the electrochemical series is mixed with t...
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votes
What is made when magnesium reacts with hydrochloric acid?
answered
Aug 16, 2018
Solution : When magnesium reacts with hydrochloric acid, hydrogen gas and soluble magnesium chloride...
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If $NaOH_{(aq)}$ reacts with $HCl_{(aq)},$ reaction can be known as
answered
Aug 16, 2018
Solution : Neutralisation is the reaction between an acid and a base to form a salt and water.$NaOH ...
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votes
Most metals react with acids to form
answered
Aug 16, 2018
Solution : Hydrogen gas is formed as the metal reacts with the acid to form a salt. Many, but not al...
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Which of the following does not corrode when exposed to the atmosphere-
answered
Aug 16, 2018
Solution : Gold is very least reactive hence does not corrode at all.
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