Recent questions tagged 2005

If $a,bc \neq 0$ and belong to the set $\{0,1,2,3.......,9\},$ then $\log _{10} \bigg(\large \frac{a+10 b +10^2 c}{10^{-4} a +10^{-3}b +10^{-2} c}\bigg)$ is equal to :

asked Nov 11, 2013 by meena.p

1 answer

$x=\large\frac{1}{2}$$ \bigg(\sqrt 3+\large\frac{1}{\sqrt 3} \bigg)$ then $\large\frac{\sqrt {x^2-1}}{x-\sqrt {x^2-1}}$ is equal to :

asked Nov 11, 2013 by meena.p

1 answer

If N denotes the set of all positive integers and if $f: N \to N$ is defined by $f(n) =$ the sum of positive divisors of n then, $f(2^k.3),$ where k is a positive integers, is :

asked Nov 11, 2013 by meena.p

1 answer

The function $f: C \to C$ defined by $f(x) =\large\frac{ax+b}{cx+d}$ for $ x \in C$ where $bd \neq 0$ reduces to a constant function , if :

asked Nov 11, 2013 by meena.p

1 answer

If $( x \in R: [x -|x|\;]=5)$ is equal to :

asked Nov 11, 2013 by meena.p

1 answer

Which one of the following pairs of reactants does not form oxygen when they react with each other?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct ?

asked Nov 11, 2013 by meena.p

0 answers

Match the following lists:

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct ?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct?

asked Nov 11, 2013 by meena.p

0 answers

The compound prepared by a substitution reaction of benzene is :

asked Nov 11, 2013 by meena.p

1 answer

In which of the following reactions, $MgO$ is not formed?

asked Nov 11, 2013 by meena.p

1 answer

The pH of a solution of $H_2O_2$ is $6.0$. some chlorine gas is bubbled into this solution. Which of the following is correct ?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is a pair of functional isomers?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct ?

asked Nov 11, 2013 by meena.p

0 answers

At $550 K,$ the $K_c$ for the following reaction is $10^{4}\;mol^{-1}\;L$

asked Nov 11, 2013 by meena.p

0 answers

Which of the following compounds is soluble in benzene but almost insoluble in water?

asked Nov 11, 2013 by meena.p

1 answer

Observe the following reaction : $2A +B \longrightarrow C$. The rate of formation of C is $2.2 \times 10^{-3}\;mol \;L^{-1} min ^{-1}.$ What is the value of $-\large\frac {d[A]}{dt}$ (in mol $L^{-1}\; min^{-1}$)?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct ?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not an air pollutant ?

asked Nov 11, 2013 by meena.p

0 answers

What is the quantity of electricity (in Coulombs) required to deposit all the silver from 250 mL of 1 M $AgNO_3$ solution ?

asked Nov 11, 2013 by meena.p

1 answer

Assertion (A) : The pH of a buffer solution containing equal moles of acetic acid and sodium acetate is 4.8 ($pK_a$ of acetic acid is 4.8). Reason (R) : The ionic product of water at $25^{\circ}C$ is $10^{-14}\;mol^{2}.L^{-2}.$

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct ?

asked Nov 11, 2013 by meena.p

0 answers

The vapour pressure of water at $23^{\circ} C$ is $19.8 \;mm. 0.1 $ mole of glucose is dissolved in $178.2\; g$ of water. What is the vapour pressure (in mm) of the resultant solution ?

asked Nov 11, 2013 by meena.p

0 answers

The vapour pressure of water at $23^{\circ}$ is $19.8\;mm. 0.1$ mole of glucose is dissolved in $178.2\;g$ of water. What is the vapour pressure (in mm) of the resultant solution ?

asked Nov 8, 2013 by meena.p

0 answers

A and B are ideal gases. The molecular weights of A and B are in the ratio of 1:4 . The pressure of a gas mixture containing equal weights of A and B is P atm. What is the partial pressure (in atm) of B in the mixture ?

asked Nov 8, 2013 by meena.p

0 answers

In the reaction

asked Nov 8, 2013 by meena.p

0 answers

x grams of calcium carbonate was completely burnt in air. The weight of the solid residue formed is 28 g. What is the value of x (in grams)?

asked Nov 8, 2013 by meena.p

0 answers

Which of the following is correct ?

asked Nov 8, 2013 by meena.p

0 answers

'Natalite' is used as:

asked Nov 8, 2013 by meena.p

1 answer

Which of the following is a linear molecule ?

asked Nov 8, 2013 by meena.p

0 answers

Identify the correct order in which the covalent radius of the following elements increases:

asked Nov 8, 2013 by meena.p

0 answers

3-hydroxybutanal is formed when (X) reacts with (Y) in dilute (Z) solution. What are X,Y and Z?

asked Nov 8, 2013 by meena.p

0 answers

The half-lives of two radioactive nuclides A and B are taken separately and allowed to disintegrate for 4 min. What will be the ratio of weights of A and B disintegrated?

asked Nov 8, 2013 by meena.p

0 answers

An electron is moving in Bohr's fourth orbit. It's de-Broglie wave length is $\lambda$. What is the circumference of the fourth orbit ?

asked Nov 8, 2013 by meena.p

2 answers

Which of the following , compounds is the reactant in Rosenmund's reduction?

asked Nov 8, 2013 by meena.p

0 answers

The atomic numbers of elements X,Y and Z are 19,21 and 25 respectively. The number of electrons present in the M shell of these elements follow the order:

asked Nov 8, 2013 by meena.p

1 answer

In which of the following reactions the product is an ether ?

asked Nov 8, 2013 by meena.p

1 answer

Which of the following is an example for heterogeneous catalysis reaction?

asked Nov 8, 2013 by meena.p

1 answer

Which one of the following reactions does not form gaseous product ?

asked Nov 8, 2013 by meena.p

0 answers

Identify A and B in the following reactions:

asked Nov 8, 2013 by meena.p

0 answers

Sodium is heated in air at $300 ^{\circ}C$ to form x.x absorbs $CO_2$ and forms $Na_2CO_3$ and Y. Which of the following is Y?

asked Nov 8, 2013 by meena.p

0 answers

Observe the following statements regarding purification of bauxite:

asked Nov 8, 2013 by meena.p

0 answers

The chemicals and the reaction conditions required for the preparation of ethane are :

asked Nov 8, 2013 by meena.p

0 answers

A complex compound of $Co^{3+}$ with molecular formula $CoCl_x.yNH_3$ gives a total of 3 ions when dissolved in water. How many $Cl^{-}$ ions satisfy both primary and secondary valencies in this complex ?

asked Nov 8, 2013 by meena.p

0 answers

In Fischer-Ringe 's method of separation of nobles gas mixture from air, ................... is used:

asked Nov 8, 2013 by meena.p

0 answers

An n-p-n transistor power amplifier in C-E configuration gives :

asked Nov 8, 2013 by meena.p

1 answer

Particles and their anti- particles have:

asked Nov 8, 2013 by meena.p

1 answer

A particle of mass $1 \times 10^{-26}\;kg$ and charge $1.6 \times 10^{-19} C$ travelling with a velocity $1.28 \times 10^{6} ms^{-1}$ along the positive X-axis enters a region in which a uniform electric field $\overrightarrow {E} $ and a uniform magnetic field of induction $\overrightarrow {B}$ are present. If $\overrightarrow {E} =-102.4 \times 10^3 \hat k NC^{-1}$ and $B= 8 \times 10^{-2}\; \hat j Wbm^{-2}$, the direction of motion of the particles is :

asked Nov 8, 2013 by meena.p

1 answer

According to Moseley's law, the frequency (v) of the $K_{\alpha}$ line and the atomic number Z of the element have the relation (A and B are constants);

asked Nov 8, 2013 by meena.p

0 answers

Ask Questions, Get Answers