Recent questions tagged class12

Two point charges of 5C and 20C are separated by a distance of 6m . Find the point on the line joining them at which electric field intessity is zero .

asked Feb 3, 2014 by yamini.v

1 answer

One mole of the complex compound $CO(NH_3)_5Cl_3$ gives 3 moles of ions on dissolution in water.On a mole of the same complex reacts with 2 moles of $AgNO_3$ solution to yield 2 moles of $AgCl(s)$.The structure of complex is

asked Feb 3, 2014 by sreemathi.v

1 answer

Coordination compound have great importance in biological system .In this content which of the following statement is incorrect

asked Feb 3, 2014 by sreemathi.v

1 answer

The coordination number of central metal atom in a complex is determined by

asked Feb 3, 2014 by sreemathi.v

1 answer

$[Cr(H_2O)_5Cl]SO_4$ and $[Cr(H_2O)_5SO_4]Cl$ are

asked Feb 3, 2014 by sreemathi.v

1 answer

2 separate reservation of oil A and B (capacity of $A=2 \times $ capacity of B) are filled completely with oil and oil is released simultaneously from both the reservoirs. The rate of flow of oil out of each reservoir at an instant of time is proportional to the quantity of oil in the reservoir at that time one hour after the oil is released the quantity of oil in reservoir A is 1.5 times the quantity of oil in reservoir B. If the reservoirs have same quantity of oil after $t= \large\frac{\log a}{\log b -\log c}$ then $a+b-c$

asked Feb 3, 2014 by meena.p

1 answer

Which of the following is true for the complexes $[Ni(CN)_4]^{2-}$ and $[NiCl_4]^{2-}$

asked Feb 3, 2014 by sreemathi.v

1 answer

Which of the following facts about the complex $[Cr(NH_3)_6]Cl_3$ is wrong

asked Feb 3, 2014 by sreemathi.v

1 answer

General solution of differential equations: $e^y dx+(xe^y-2y)dy=0$

asked Feb 3, 2014 by meena.p

1 answer

Which one of the following has an optical isomer

asked Feb 3, 2014 by sreemathi.v

1 answer

If the electric flux entering and leaving an enclosed surface is $\phi_{1}\;and\;\phi_{2}\;.$ The charge inside the surface will be

asked Feb 3, 2014 by yamini.v

1 answer

General solution of differential equation: $\large\frac{xdy}{x^2+y^2} $$+\bigg(1- \large\frac{y}{x^2+y^2} \bigg)$$dx=0$ is

asked Feb 3, 2014 by meena.p

1 answer

Which of the following pairs represents linkage isomers :

asked Feb 3, 2014 by sreemathi.v

1 answer

Which of the following has an optical isomer

asked Feb 3, 2014 by sreemathi.v

1 answer

In which of the following octahedral complexes of CO(at.no=27),will be magnitude of $\Delta_0$ be the highest

asked Feb 3, 2014 by sreemathi.v

1 answer

General solution of $(2x^3-xy^2)dx+(2y^3-x^2y)dy=0$ is

asked Feb 3, 2014 by meena.p

1 answer

The coordination number and the oxidation state of the element 'E' in the complex $[E(en)_2(C_2O_4)]NO_2$ when 'en' is ethylenediamine

asked Feb 3, 2014 by sreemathi.v

1 answer

A firm has to transport 1200 packages using large vans which can carry 200 packages each and small vans which can take 80 packages each.The cost for engaging each large van is Rs 400 and each small van is Rs 200.Not more than Rs 3000 is to be spent on the job and the number of large vans cannot exceed the number of small vans.What will be the minimum cost?

asked Feb 1, 2014 by rvidyagovindarajan_1

1 answer

A bag contains 4 balls. Two balls are drawn at random and are found to be white. What is the probability that the bag has 3 white balls.

asked Jan 31, 2014 by rvidyagovindarajan_1

1 answer

If $x= \sec \theta -\cos \theta $ and $y=\sec^n \theta -\cos ^n \theta$ then $\bigg(\large\frac{dy}{dx}\bigg)^2=$

asked Jan 31, 2014 by meena.p

1 answer

If $x= \cos^{-1} \bigg( \large\frac{1}{\sqrt {1+t^2}}\bigg) $ and $\; y= \sin ^{-1} \bigg( \large\frac{1}{\sqrt {1+t^2}}\bigg) $ then $\large\frac{dy}{dx}$

asked Jan 31, 2014 by meena.p

1 answer

If $x^2+y^2=t-\large\frac{1}{t} ,$$x^4+y^4 =t^2+\large\frac{1}{t^2}$ then $\large\frac{dy}{dx}$

asked Jan 31, 2014 by meena.p

1 answer

Which one of the following has a square planar geometry

asked Jan 31, 2014 by sreemathi.v

1 answer

If $\phi (x) =f(x) g(x),$ where $f'(x) g'(x) =c$ and $ \large\frac {\phi ''}{\phi} =\frac {f''}{f} +\frac{g''}{g}+\frac{Kc}{fg}$ then value of K.

asked Jan 31, 2014 by meena.p

1 answer

How many EDTA (ethylenediaminetetraacetic acid) molecules are required to make an octahedral complex with $Ca^{2+}$ ion

asked Jan 31, 2014 by sreemathi.v

1 answer

In $Fe(CO)_5$,the $Fe-C$ bond poses

asked Jan 31, 2014 by sreemathi.v

1 answer

The IUPAC name of the complex $[CO(NO_2)(NH_3)_5]Cl_2$ is

asked Jan 31, 2014 by sreemathi.v

1 answer

Assertion : For the following equation degree $\large\frac{d^4}{dx^4} $$ +\sin \bigg ( \large\frac{d^2y}{dx^2}\bigg)=0$ Reason : Order of DE is the order of highest differentiate coefficient occurring in the equation

asked Jan 31, 2014 by meena.p

1 answer

Which of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour

asked Jan 31, 2014 by sreemathi.v

1 answer

$ \text{If } \begin{vmatrix} 2 x&5 \\ 8&x \end{vmatrix} = \begin{vmatrix} 4&5 \\ 8&3 \end{vmatrix},then\; x\; is\; equal\; to$

asked Jan 31, 2014 by rvidyagovindarajan_1

1 answer

Which of the following compound shows optical isomerism

asked Jan 31, 2014 by sreemathi.v

1 answer

Solution of differential equation: $X^2= 1+\large\frac{1}{2} \bigg( \large\frac{x}{y}\bigg)^{-1} \frac{dy}{dx} + \large\frac{\bigg(\Large\frac{x}{y}\bigg)^{-2} \bigg(\Large\frac{dy}{dx}\bigg)^{2}}{4 \times 2 \times 1}+ \large\frac{\bigg(\Large\frac{x}{y}\bigg)^{-3} \bigg(\Large\frac{dy}{dx}\bigg)^{3}}{8 \times 3 \times 2 \times 1}+ \large\frac{\bigg(\Large\frac{x}{y}\bigg)^{-4} \bigg(\Large\frac{dy}{dx}\bigg)^{4}}{16 \times 4 \times 3 \times 2 \times 1}+..........$

asked Jan 31, 2014 by meena.p

1 answer

IUPAC name of coordination compound $K_3[Fe(CN)_6]$ is

asked Jan 31, 2014 by sreemathi.v

1 answer

Calomol $(Hg_2Cl_2)$ on reaction with ammonium hydroxide gives

asked Jan 31, 2014 by sreemathi.v

1 answer

The oxidation state of Cr in the complex $[Cr(NH_3)_4Cl_2]^+$ is

asked Jan 31, 2014 by sreemathi.v

1 answer

The correct order of magnetic moments (spin only values in B.M) among is

asked Jan 31, 2014 by sreemathi.v

1 answer

In the circuit given below the value of current is :

asked Jan 31, 2014 by meena.p

1 answer

Which one of the following has largest no of isomers

asked Jan 31, 2014 by sreemathi.v

1 answer

A transistor is connected in common emitter mode. In the collector circuit the voltage drop across the resistor of $800 \; \Omega$ is $0.5 V$ . If current gain $\alpha$ is $0.96$ What is base current

asked Jan 31, 2014 by meena.p

1 answer

Which one of the following complexes is an outer orbital complex

asked Jan 31, 2014 by sreemathi.v

1 answer

A reduction in atomic size with increase in atomic number is a characterstic of elements of

asked Jan 31, 2014 by sreemathi.v

1 answer

When forward bias is applied to a p-n junction.

asked Jan 31, 2014 by meena.p

1 answer

Functions of rectifier is

asked Jan 31, 2014 by meena.p

1 answer

In the coordination compound,$K_4[Ni(CN)_4]$ the oxidation state of nickel is

asked Jan 31, 2014 by sreemathi.v

1 answer

The hybridisation of Fe in $[Fe(H_2O)_5NO]SO_4$ is

asked Jan 31, 2014 by sreemathi.v

1 answer

The graph given below represents the I-V characteristics of a zener diode. Which part of the curve is relevant for operation as voltage regulator?

asked Jan 31, 2014 by meena.p

1 answer

The following complex representation violates IUPAC rule

asked Jan 31, 2014 by sreemathi.v

1 answer

A complex in which central atom carries zero oxidation state is

asked Jan 31, 2014 by sreemathi.v

1 answer

In extrinsic semiconductors

asked Jan 31, 2014 by meena.p

1 answer

The effective atomic number of Cr in $[Cr(NH_3)_6]Cl_3$ is

asked Jan 31, 2014 by sreemathi.v

1 answer

Ask Questions, Get Answers