Recent questions tagged medium

Which of the following compounds is the most polar: H$_2$O (l), H$_2$S (g), HF (l), HCl (g) ?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

Four elements P, Q, R and S belong to groups 13, 15, 16, and 17, but not in that order. The electronegativity values of four elements in the same period of the periodic table are listed below:

asked Jul 24, 2014 by balaji.thirumalai

1 answer

An equilateral triangle is inscribed in the parabola $ y^2 = 4 ax$, where one vertex is at the vertex of the parabola. Find the length of the side of the triangle

asked Jul 24, 2014 by thanvigandhi_1

1 answer

A man running a racecourse notes that the sum of the distances from the two flag posts from him is always 10 m and the distance between the flag posts is 8 m. Find the equation of the posts traced by the man.

asked Jul 24, 2014 by thanvigandhi_1

1 answer

Which of the following statements regarding ozone is not correct?

asked Jul 24, 2014 by sreemathi.v

1 answer

When pure $H_2SO_4$ is electrolysed,the product at the anode is

asked Jul 24, 2014 by sreemathi.v

1 answer

Which of the following oxo-acids of sulphur has more than one oxidation state of sulphur?

asked Jul 24, 2014 by sreemathi.v

1 answer

The oxidation state of sulphur in peroxodisulphuric acid,$H_2SO_{6+}$,is

asked Jul 24, 2014 by sreemathi.v

1 answer

The oxidation state of sulphur in peroxodisulphuric acid,$H_2S_2O_8$,is

asked Jul 24, 2014 by sreemathi.v

1 answer

How much energy in kJ is released when 7.1 g of Chlorine are completely converted to Cl$^{-}$ ions in the gaseous state?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

Which of the acids does not include S-S bond?

asked Jul 24, 2014 by sreemathi.v

1 answer

How much energy in kJ is released when 3.55g of Chlorine are completely converted to Cl$^{-}$ ions in the gaseous state?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

The first ionization potentials of Na, Mg, Al and Si in order is best represented as?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

The first ionization potentials of Na, Mg, Al and Si in order is best represented as?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

The first ionization potentials in electron volts of nitrogen and oxygen are respectively given by?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

The radii of F, O, F$^{-}$ and O$^{2-}$ follows which of the following orders:

asked Jul 23, 2014 by balaji.thirumalai

1 answer

The ionic radius of Na$^{+}$ ion is 0.95 and the inter-nuclear distance between ion pairs in the NaCl crystal is 2.76. What is the radius of the Cl$^{-}$ ion?

asked Jul 23, 2014 by balaji.thirumalai

1 answer

Which of the following statements are incorrect?

asked Jul 23, 2014 by balaji.thirumalai

1 answer

Rank each set of ions in order of decreasing size: Ca$^{2+}$, Sr$^{2+}$, Mg$^{2+}$.

asked Jul 23, 2014 by balaji.thirumalai

1 answer

Rank the elements in each of the following sets in order of decreasing First Ionization Energy IE$_1$: K, Ca, Rb

asked Jul 23, 2014 by balaji.thirumalai

1 answer

Rank the elements in each of the following sets in order of decreasing First Ionization Energy IE$_1$: K, Ca, Rb

asked Jul 23, 2014 by balaji.thirumalai

1 answer

Rank the elements in each of the following sets in order of decreasing First Ionization Energy IE$_1$: Sb, Te, Sn

asked Jul 23, 2014 by balaji.thirumalai

1 answer

Find the area of the triangle formed by the lines joining the vertex of the parabola $ x^2 = 12y $ to the ends of its latus rectum.

asked Jul 23, 2014 by thanvigandhi_1

1 answer

A rod of length 12 cm moves with its ends always touching the coordinate axes. Determine the equation of the locus of a point P on the rod, which is 3 cm from the end in contact with the x-axis.

asked Jul 23, 2014 by thanvigandhi_1

1 answer

If a parabolic reflector is 20 cm in diameter and 5 cm deep, find the focus.

asked Jul 23, 2014 by thanvigandhi_1

1 answer

In acidic medium,$MnO_4^-$ is converted to $Mn^{2+}$ when acts as an oxidizing agent.The quantity of electricity required to reduce 0.05 mol of $MnO_4^-$ would be

asked Jul 23, 2014 by sreemathi.v

1 answer

In an electrolysis of a metallic chloride 3.283 g of the metal (molar mass $197gmol^{-1}$) was deposited on the cathode by the passage of 4825C of electric charge.The charge number of metal ion is

asked Jul 23, 2014 by sreemathi.v

1 answer

In the electrolysis of alkaline water,a total of 1 mol of gases is evolved.The amount of water decomposed would be

asked Jul 23, 2014 by sreemathi.v

1 answer

The time required to coat a metal surface of $80cm^2$ with $5\times 10^{-3}$cm thick layer of silver (density $10.5gcm^{-3})$ with the passage of 3A current through a silver nitrate solution is

asked Jul 23, 2014 by sreemathi.v

1 answer

A current of $9.65A$ is passed for 3h between nickel electrodes in 0.5L of a 2M solution of $Ni(NO_3)_2$.The molarity of solution after electrolysis would be

asked Jul 23, 2014 by sreemathi.v

1 answer

The density of Cu is $8.94gcm^{-3}$.The quantity of electricity needed to plate an area 10 cm $\times$ 10 cm to a thickness of $10^{-2}$cm using $CuSO_4$ solution is

asked Jul 23, 2014 by sreemathi.v

1 answer

A solution containing $8.6gL^{-1}$ of urea (molar mass $60gmol^{-1}$) is isotonic with a 5% solution of unknown solute.The molar mass of the solute will be

asked Jul 23, 2014 by sreemathi.v

1 answer

The molar mass of sodium chloride determined by osmotic pressure would be

asked Jul 23, 2014 by sreemathi.v

1 answer