Recent questions tagged ch-7

In the preparation of $H_2SO_4$ by contact process , why is $ SO_3$ hot absorbed directly in water to form $H_2SO_4$?

asked Nov 17, 2016 by meena.p

1 answer

Draw the structure of the following $a)H_2S_2O_8 \\ b)X_eO_3 \\ c) HOClO_2 $

asked Nov 15, 2016 by meena.p

1 answer

Complete the following reactions : (i) $P_4 +8SOCl_2 \to \\ (ii)\;I^{-}+O_3+H_2O \to $

asked Nov 15, 2016 by meena.p

2 answers

What happens when (i) Chorine gas is passed through a hot concentrated solution of $NaOH$? (ii) Sulphur dioxide gas is passed gas is passed through an aqueous solution of $Fe(III) $ salt ?

asked Nov 14, 2016 by meena.p

1 answer

Explain giving a suitable reason for each of the following : a)Transition metal and their compounds are generally found to be good catalysts. b) Transition metal and their compounds generally exhibit a para-magnetic behaviour .

asked Nov 11, 2016 by meena.p

1 answer

Explain why inspite of nearly the same electronegativity , oxygen forms hydrogen bonding while chloride does not

asked Nov 11, 2016 by meena.p

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p- Dichlorobenzene has higher melting point and lower solubility than o- and m- isomers Discuss.

asked Nov 7, 2016 by meena.p

1 answer

Explain giving a reason for each of the following situation : (i) In aqueous medium, HCl is stronger acid than HF (ii) White phosphorus is more reactive than red phosphorous.

asked Nov 4, 2016 by meena.p

1 answer

When Cons $H_2SO_4$ was added into an unknown salt present in a test tube, a brown gas (A) was evolved . This gas intensified when copper turnings were also added into this test tube . On cooling , the gas (A) changed into a colourless gas (B) (a) identify the gases A and B.

asked Nov 3, 2016 by meena.p

1 answer

Calculate the number of unpaired electrons in the following gaseous ions : $(i)Mn^{3+} (ii) Cr^{3+} (iii) V^{3+} (iv) Ti ^{3+} $ Which one of these is most stable in aqueous solutions ?

asked Nov 1, 2016 by meena.p

1 answer

How many Isomers are there for octahedral complex $[COCl_2(en)(NH_3)_2]^+$

asked Oct 31, 2016 by meena.p

1 answer

What is meant by disproportionation of an oxidation state ? Give an example

asked Oct 27, 2016 by meena.p

1 answer

Give the reasons for the following : (a) $CN^{-}$ ions is known but $CP^{-} $ ion is not known (b) $NO_2$ dimerizes to form $N_2O_4$ (c) $ICI$ is more reactive that $I_2$

asked Oct 27, 2016 by meena.p

1 answer

Predict which of the following will be colourless in aqueous solution ? $Ti^{3+},V^{3+},Sc^{3+},Mn^{2+},Fe^{3+},Co^{2+}$ and $MnO_4^{-}$

asked Oct 26, 2016 by meena.p

1 answer

(a) Give one reaction of D- glucose which cannot be explained by its open chain structure . (b)Give one example each for essential and non essential amino acids (c) Differentiate between keratin and insulin .

asked Oct 20, 2016 by meena.p

1 answer

Complete the following reactions: $(i) X_eF_6 +H_2O \to$ _+ ___ $\\ (ii) X_eF_6 +H_2O \to$ _ + ___ $ \\ (iii) Cl_2+H_2O \to$ _ + ___

asked Oct 13, 2016 by meena.p

1 answer

In the given figure, AP is equal to

asked Jul 27, 2016 by meena.p

1 answer

In trapezium $ABCD$, if $AB = 9\; cm, DC = 6\; cm$ and $BD = 12\; cm$, then $BO$ is equal to

asked Jul 27, 2016 by meena.p

1 answer

In the given figure if $BP \parallel CF,DP \parallel EF,$ then $AD : DE$ is equal to

asked Jul 27, 2016 by meena.p

1 answer

In the given figure $PQ \parallel BC$.$\large\frac{AP}{PB}$$=4$then the value of $\large\frac{AQ}{AC}$

asked Jul 27, 2016 by meena.p

1 answer

In the adjoining figure P and Q are points on the sides $AB$ and $AC$ respectively of $\Delta ABC$ such that $AP = 3.5 \;cm, PB = 7\;cm, AQ = 3 \;cm, QC = 6\; cm$ and $PQ = 4.5\; cm$. The measure of $BC$ is equal to

asked Jul 27, 2016 by meena.p

1 answer

If $\Delta ABC \approx \Delta EDF \;and\; \Delta ABC$ not similar to $\Delta DEF$ then which of the following is not true?

asked Jul 26, 2016 by meena.p

1 answer

It is given that $\Delta ABC \approx \Delta DFE, \angle A=30^{\circ}, \angle C=40^{\circ},AB=5\;cm, \Delta ABC \approx \Delta DFE, \angle A=300, \angle C=400, AB=5\;cm,AC=8\;cm$ and $DF=7.5\;cm$.Then, the following is true.

asked Jul 26, 2016 by meena.p

0 answers

If in two triangles $ABC$ and $DEF,\large\frac{AB}{DE}=\frac{BC}{FE}=\frac{CA}{FD},$ then

asked Jul 26, 2016 by meena.p

1 answer

If in $\Delta ABC$ and $\Delta DEF, \large\frac{AB}{DE}=\frac{BC}{FD},\frac{AB}{DE}=\frac{BC}{FD},$ then they will be similar, when

asked Jul 26, 2016 by meena.p

1 answer

In $\Delta ABC$ and $\Delta PQR, \angle B, \Delta ABC,$ and $\Delta PQR, \angle B = \angle Q, \angle R=\angle C$ and $AB=\angle Q,\angle R= \angle C$ and $AB =2QR$.Then,thetrianglesare

asked Jul 26, 2016 by meena.p

1 answer

Simplify : $n^2(n-2) +2n^3(n+3)-6n(n-4)$

asked Jun 5, 2015 by meena.p

1 answer

If $ab=6$ and $a+b=5$, then the value of $(a^2+b^2)$

asked Jun 5, 2015 by meena.p

0 answers

If $ab=6$ and $a+b=5$, then the value of $(a^2+b^2)$

asked Jun 5, 2015 by meena.p

1 answer

$(6x^2-4x+5)-(3x^2-2x-3)$ is equal to

asked Jun 5, 2015 by meena.p

1 answer

If $y=-2$ the value of $4y^2+2y+1$ is

asked Jun 5, 2015 by meena.p

1 answer

On simplifying $4x^2 -3y^2 +2z^2 - 5x^2+2y^2-2x^2$ we get

asked Jun 5, 2015 by meena.p

1 answer

$3y(2y-7)-3(y-4) -63=? $

asked Jun 5, 2015 by meena.p

1 answer

Coefficient of line terms need not be the

asked Jun 5, 2015 by meena.p

1 answer

$\bigg( \large\frac{4}{3} $$m -\frac{3}{4}n\bigg)^2 +2nm=?$

asked Jun 4, 2015 by meena.p

1 answer

Simplify : $(xy+yz)^2-(xy-yz)^2$

asked Jun 4, 2015 by meena.p

1 answer

Terms are added to form ________

asked Jun 4, 2015 by meena.p

1 answer

Value of expression $a(a^2+a+1)+5$ for $ a=0$ is

asked Jun 4, 2015 by meena.p

1 answer

The volume of rectangular box whose length breadth and height is $2p,4q,8r$ respectively

asked Jun 4, 2015 by meena.p

1 answer

The value of $3x(4x-5)+3$ for $x=3$

asked Jun 4, 2015 by meena.p

1 answer

The area of rectangle is xy where x is length and y is breadth . If the length of rectangle is increased by 5 units and breadth is decreased by 3 units , the nw area of rectangle will be

asked Jun 4, 2015 by meena.p

1 answer

What is the value of the expression below when $t=2.(7+t).(t-4) $

asked Jun 4, 2015 by meena.p

1 answer

If $x+y=4$ and $xy =3$ , find the value of $x^2+y^2$

asked Jun 4, 2015 by meena.p

1 answer

Find the area of the field whose length is $3x^2y+y^2$ and breadth is $\large\frac{5}{8} $$x^2$

asked Jun 3, 2015 by meena.p

1 answer

Find the volume of box whose dimensions are $3xy^2,\large\frac{1}{7}$$x^3$ and $\large\frac{4}{5}$$x^2y$

asked Jun 3, 2015 by meena.p

1 answer

If $x^2+y^2 =10$ and $xy =3$ , the value of $5(x+y)^2 +3(x-y)^2=$

asked Jun 3, 2015 by meena.p

1 answer

There are two numbers such that sum of their squares is $18$ and sum of the numbers is 6. Find there product .

asked Jun 3, 2015 by meena.p

1 answer

If $ p^2 +\large\frac{1}{p^2}$$=14$ find the value of $\bigg(p-\large\frac{1}{p}\bigg)^2$

asked Jun 3, 2015 by meena.p

1 answer

Simplify $(xy+yz)^2 - 2x^2y^2z$ . Find the value when $x=-1\;y=1$ and $z=2$

asked Jun 3, 2015 by meena.p

1 answer

Simplify $(x+y) (2x-3y+z) -(2x-3y)z$

asked Jun 3, 2015 by meena.p

1 answer

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