Recent questions tagged 87

Ionized hydrogen atoms and a-particles with same momenta enters perpendicular to a constant magnetic field B. The ratio of their radii of their paths $rH:r\alpha$ will be

asked Jul 8, 2019 by pady_1

1 answer

Carbogen is :

asked Dec 19, 2018 by pady_1

0 answers

Among the first lines of Lyman, Balmer, Paschen and Brackett series in hydrogen atomic spectra, which has the highest energy?

asked Dec 19, 2018 by pady_1

1 answer

Which of the following is correct for acid buffer ? [ salt = S, acid = A ] :

asked Dec 19, 2018 by pady_1

1 answer

Which of the following statements is true ?

asked Dec 11, 2018 by pady_1

0 answers

Which of the following concentration factor is affect by change in temperature ?

asked Dec 11, 2018 by pady_1

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Which of the following group of transition metals is called coinage metals ?

asked Dec 11, 2018 by pady_1

0 answers

Which of the following are Lewis acids?

asked Dec 11, 2018 by pady_1

0 answers

A metal crystallises in a face centred cubic structure. If the edge length of its unit cell is 'a', the closest approach between two atoms in metallic crystal will be :

asked Dec 11, 2018 by pady_1

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Let two fair six-faced dice $A$ and $B$ be thrown simultaneously. If $E_1$ is the event that die $A$ shows up four, $E_2$ is the event that die $B$ shows up two and $E_3$ is the event that the sum of numbers on both dice is odd, then which of the following statements is NOT true ?

asked Dec 11, 2018 by pady_1

1 answer

A factory is operating in two shifts, day and night, with 70 and 30 workers respectively. If per day mean wage of the day shift workers is Rs 54 and per day mean wage of all the workers is Rs 60, then per day mean wage of the night shift workers (in Rs) is :

asked Dec 11, 2018 by pady_1

1 answer

Which one is classified as a condensation polymer?

asked Dec 11, 2018 by pady_1

0 answers

The amplitude of a damped oscillator decreases to 0.9 times its original magnitude is 5s. In another 10s it will decrease to $\alpha$ times its original magnitude, where $\alpha$ equals

asked Dec 11, 2018 by pady_1

0 answers

2-Hexyne gives trans-2-Hexene on treatment with :

asked Dec 11, 2018 by pady_1

0 answers

Phenol is heated with a solution of mixture of $KBr$ and $KBrO_3$. The major product obtained in the above reaction is

asked Dec 11, 2018 by pady_1

0 answers

Consider the system of linear equations: $x_1 + 2x_2 + x_3 = 3$ $2x_1 + 3x_2 + x_3 = 3 $ $3x_1 +5 x_2 + 2x_3 = 1$ The system has

asked Dec 11, 2018 by pady_1

0 answers

Let $f(x) = x|x| $ and $g(x) = \sin x$ Statement -1 : gof is differentiable at $x=0$ and its derivative is continuous at the point. Statement -2 : gof is twice differentiable at $x=0$

asked Nov 29, 2018 by pady_1

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A jar filled with two non mixing liquids 1 and 2 having densities $p_1 and P_2$ respectively. A solid ball, made of a material of density $p_3$, is dropped in the jar. It comes to equilibrium in the position shown in the figure.Which of the following is true for $P_1, p_2\; and\; p_3$?,

asked Nov 29, 2018 by pady_1

0 answers

Which of the following molecules is expected to rotate the plane of plane-polarised light ?

asked Nov 29, 2018 by pady_1

0 answers

The increasing order of the first ionization enthalpies of the elements $B, \; P\; S$ and $F$ (lowest first) is :

asked Nov 13, 2018 by pady_1

0 answers

Lattice energy of an ionic compound depends upon :

asked Nov 5, 2018 by pady_1

0 answers

Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them ?

asked Nov 5, 2018 by pady_1

2 answers

The solubility of $BaSO_4$ in water is $2.42 \times 10^{-3} gL^{-1}$ at 298 K. The value of its solubility product $(K_{sp})$ will be (Given molar mass of $BaSO_4 = 233 \; g\;mol^{-1}$ )

asked Aug 21, 2018 by pady_1

1 answer

The region of Biosphere Reserve which is legally protected and where no human activity is allowed is known as :

asked Aug 21, 2018 by pady_1

1 answer

A river with an inflow of domestic sewage rich in organic waste may result in -

asked Aug 21, 2018 by pady_1

1 answer

Golden rice is a genetically modified crop plant where the incorporated gene is meant for biosynthesis of -

asked Aug 21, 2018 by pady_1

1 answer

Which of the following will not be soluble in sodium hydrogen carbonate?

asked Aug 20, 2018 by pady_1

1 answer

asked Aug 20, 2018 by pady_1

1 answer

The correct order of decreasing acid strength of trichloroacetic acid (A), trifluoroacetic acid (B), acetic acid (C) and formic acid (D) is :

asked Aug 20, 2018 by pady_1

2 answers

Of the following which one is classified as polyester polymer ?

asked Aug 16, 2018 by pady_1

1 answer

In which one of the following species the central atom has the type of hybridization which is not the same as that present in the other three? –

asked Jul 26, 2018 by pady_1

1 answer

$H_2 COH.CH_2 OH$ on heating with periodic acid gives :

asked Jul 26, 2018 by pady_1

1 answer

In a $S_N2$ substitution reaction of the type $R-Br+Cl^-\underrightarrow{DMF} R-Cl+Br^-$ Which one of the following has the highest relative rate ?

asked Jul 26, 2018 by pady_1

1 answer

Reduction of aldehydes and ketones into hydrocarbons using zinc amalgum and conc. HCl is called :

asked Jul 26, 2018 by pady_1

1 answer

During osmosis, flow of water through a semipermeable membrane is:-

asked Jul 25, 2018 by pady_1

1 answer

The cell membranes are mainly composed of :-

asked Jul 24, 2018 by pady_1

1 answer

The solubility product of a sparingly soluble salt $AX_2$ is $3.2\times 10^{-11}$. Its solubility (in moles/litre) is:-

asked Jul 24, 2018 by pady_1

1 answer

Vitamin $B_{12}$ contains :

asked Jul 24, 2018 by pady_1

1 answer

n-propyl alcohol and isopropyl alcohol can be chemically distinguished by which reagent : -

asked Jul 23, 2018 by pady_1

1 answer

Which of following organometallic compound is $\sigma$ and $\pi$ bonded : -

asked Jul 20, 2018 by pady_1

1 answer

Which complex compound will give four isomers :

asked Jul 20, 2018 by pady_1

1 answer

By which method activation energy can be calculated?

asked Jun 15, 2018 by pady_1

1 answer

egg: fish : : ________ : plant

asked Dec 31, 2015 by pady_1

1 answer

In his end of year exams, Joe scored the following: Science 34% English 90% History 87% Math 34% Geography 55% What was the median?

asked Dec 31, 2015 by pady_1

1 answer

Find the area of a rectangle whose length is 32 m and breadth is 200 cm.

asked Dec 31, 2015 by pady_1

0 answers

There are 4,769 books at the library. They need to be sorted into 19 groups. How many books will be in each group?

asked Dec 31, 2015 by pady_1

1 answer

Elmo needs 18 cartons of berries to make a berry cobbler. He already has 1 carton of strawberries and 7 cartons of blueberries. How many more cartons of berries should Elmo buy?

asked Dec 31, 2015 by pady_1

0 answers

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