Recent questions tagged medium

Which of the following compound shows optical isomerism

asked Jan 31, 2014 by sreemathi.v

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

asked Jan 31, 2014 by sreemathi.v

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The standard deviation of $n$ observations $x_1, x_2, ....x_n$ is 2. If $ \sum_{i=1}^n x_i=20$ and $ \sum_{i=1}^n x_i^2=100$ then $n$ is $i=1$

asked Jan 31, 2014 by thanvigandhi_1

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

asked Jan 31, 2014 by sreemathi.v

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

asked Jan 31, 2014 by sreemathi.v

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

asked Jan 31, 2014 by sreemathi.v

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Which one of the following has largest no of isomers

asked Jan 31, 2014 by sreemathi.v

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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

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Which one of the following complexes is an outer orbital complex

asked Jan 31, 2014 by sreemathi.v

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

asked Jan 31, 2014 by sreemathi.v

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

asked Jan 31, 2014 by sreemathi.v

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Atomic radius is of the order of $10^{-8} cm$ and nuclear radius is of the order of $10^{-13}$ cm. calculate what fraction of atom is occupied by nucleus?

asked Jan 31, 2014 by sharmaaparna1

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Find out the energy of H atom in first excitation state. The value of permitivity factor $4\pi E_{\large\circ} = 1.11264\times10^{-10} C^2N^{-1}m{-2}$

asked Jan 31, 2014 by sharmaaparna1

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What is the principal quantum no. of H-atom Orbital if the electron energy is -3.4 eV ? also report the angular momentum of electron

asked Jan 31, 2014 by sharmaaparna1

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By using the properties of definite integrals,evaluate the integral $ \int\limits_{-10}^{10}\mid x+2 \mid\;dx$

asked Jan 31, 2014 by balaji

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In the circuit given below if the output $D=1$ the input must be

asked Jan 31, 2014 by meena.p

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which of the following represents the system of logic gates given below.

asked Jan 31, 2014 by meena.p

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The following circuit can be reduced to what type of a gate?

asked Jan 30, 2014 by meena.p

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If $x,y,z$ are all distinct and $\begin{vmatrix}x&x^2&1+x^3\\y&y^2&1+y^3\\z&z^2&1+z^3\end{vmatrix}=0$ then the value of $\;\large\frac{-1}{xyz}$ is

asked Jan 30, 2014 by balaji.thirumalai

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The NOR gate can be represented by which venn diagram ?

asked Jan 30, 2014 by meena.p

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The following logic circuit has output

asked Jan 30, 2014 by meena.p

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Three NAND gates are connected as shown in circuit. The logic operation corresponds to

asked Jan 30, 2014 by meena.p

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In acidic medium one mole of $MnO_4^-$ accepts how many moles of electrons in a redox process ?

asked Jan 30, 2014 by sreemathi.v

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In first transition series, the melting point of Mn is low because

asked Jan 30, 2014 by sreemathi.v

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Given the following VI-Characteristic curve of a pn-junction diode, identify what is (A) and (B)?

asked Jan 30, 2014 by meena.p

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Vanadium (III) oxide is a strong

asked Jan 30, 2014 by sreemathi.v

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In which of the following will the ionic radii of chromium be the smallest

asked Jan 30, 2014 by sreemathi.v

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The figure shows two capacitors of capacitance c and charged to same potential c connected in two circuits . What will be the charge on the capacitor after a time $t= cr$ from the start

asked Jan 30, 2014 by meena.p

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Presence of nitrogen in which of the following compound cannot be detected by Lassaigne's test?

asked Jan 30, 2014 by mosymeow_1

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A proton is released from rest , 10 cm from a charged sheet carrying charge density of $\;-2.21\times10^{-9}\;c/m^2\;.$ It will strike the sheet after time $\;(approximately)$

asked Jan 30, 2014 by yamini.v

1 answer

The standard reduction potentials (E$^{\circ}$ ) of the lanthanides for M$^{+3}$ (aq) + 3e$^{-} \overset{\Delta} \rightarrow$ M (s) all fall between –2.52 V (La) and –2.25 V (Lu). This helps explain which of the following properties of Lanthanides?

asked Jan 30, 2014 by sreemathi.v

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Match the following, where EAN stands for Effective Atomic Number, the number of electrons on the central metal ion, including ligands in the bonding:

asked Jan 30, 2014 by sreemathi.v

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Which of the following statements about magnetic properties is/are incorrect?

asked Jan 30, 2014 by sreemathi.v

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Suppose that 5% of men and 0.25% of women have grey hair. A grey haired person is selected at random. What is the probability of this person being male? Assume that there are equal number of males and females.

asked Jan 30, 2014 by balaji

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What is the spin only magnetic moment value in Bohr magneton unit for $K_2Co(SCN)_4$?

asked Jan 30, 2014 by sreemathi.v

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What is the spin only magnetic moment value in (Bohr Magneton units) of Cr(CO)$_6$?

asked Jan 30, 2014 by sreemathi.v

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Calculate the largest wavelength which can remove the electron from 1 Bohr's orbit. Given $E_1$ = 13.6 eV

asked Jan 30, 2014 by sharmaaparna1

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What is the area of the parallelogram having diagonals $ 3\bar{i}+\bar{j}-2\bar{k}\;and\;\bar{i}-3\bar{j}+4\bar{k}$?

asked Jan 30, 2014 by balaji

1 answer

If $e^{x+y}=xy,$ what is $\large\frac{dy}{dx}$?

asked Jan 29, 2014 by balaji

1 answer

The variance of $n$ natural number is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

If you flip a fair coin 19 times, what is the probability that you will end up with an even number of heads?

asked Jan 29, 2014 by balaji

1 answer

The correlation coefficient of two variables $x$ and $y$ is 0.8. The regression coefficient of $y$ on $x$ is 0.2 then the regression coefficient of $x$ and $y$ is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

The correlation coefficient between $x$ and $y$ is from the following data is \[\] $ \Sigma x = 40\: \: \Sigma y=50\: \: \Sigma xy = 220\: \: \Sigma x^2=200\: \: \Sigma y^2 = 262\: \: n=10$

asked Jan 29, 2014 by thanvigandhi_1

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The geometric mean of $ 2.262.....2^n$ is

asked Jan 29, 2014 by thanvigandhi_1

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If $b_{yx}=1.6$ and $b_{xy}=0.4$ and the angle between two regression lines is $ \theta$ then $ \tan \theta$ is

asked Jan 29, 2014 by thanvigandhi_1

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A proton , a deutron and alpha particle are accelerated through potentials of $\;V , 2V ,4V\;$respectively . Their velocity will bear a ratio .

asked Jan 29, 2014 by yamini.v

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What happens when a solution of potassium chromate is treated with excess dil. Nitric acid?

asked Jan 29, 2014 by sreemathi.v

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Which of the following is an example of Disproportionation of an oxidation state, in which a single substance is simultaneously reduced and oxidized to form two different products one with a higher oxidation state and one with a lower oxidation state?

asked Jan 29, 2014 by sreemathi.v

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Which of the following statements regarding transition elements is/are incorrect?

asked Jan 29, 2014 by sreemathi.v

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The formula for calculating the Highest Oxidation State for a Transition metal can be given as follows: Number of Unpaired d-electrons + Two s-orbital electrons. This is true for all the transition metals except two. Which of the following two?

asked Jan 29, 2014 by sreemathi.v

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