Recent questions tagged 74

Two particles A and B are moving in uniform circular motion in concentric circles of radius rA and rB with speed uA and uB respectively. The time period of roation is the same. The ratio of angular speed of A to that of B will be :

asked Jul 8, 2019 by pady_1

1 answer

A gas decolourises $Br_2$ in $CCl_4$ and forms a precipitate with ammonical silver nitrate. The gas is :

asked Dec 19, 2018 by pady_1

0 answers

Hydrolysis of chloroform with aqueous KOH gives finally :

asked Dec 19, 2018 by pady_1

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What is the molecular formula of white phosphorus ?

asked Dec 19, 2018 by pady_1

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Absolute alcohol (100% alcohol) is prepared by distilled rectified spirit over :

asked Dec 11, 2018 by pady_1

1 answer

Formation of covalent bonds in compounds exhibits :

asked Dec 11, 2018 by pady_1

0 answers

According to Newton's law of cooling, the rate of cooling of a body is proportional to $(\Delta \theta)^n$, where $\Delta \theta$ is the difference of the temperature of the body and the surroundings, and $n$ is equal to :

asked Dec 11, 2018 by pady_1

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Consider the following reaction and statements : $[Co(NH_3)_4Br_2]^+ + Br^- \to [Co(NH_3)_3Br_3] + NH_3$ (i) Two isomers are produced if the reactant complex ion is a cis-isomer. (ii) Two isomers are produced if the reactant complex ions is a trans-isomer. (iii) Only one isomer is produced if the reactant complex ion is a trans-isomer. (iv) Only one isomer is produced if the reactant complex ion is a cis-isomer. The correct statements are :

asked Dec 11, 2018 by pady_1

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$pK_a$ of a weak acid (HA) and $pK_b$ of a weak base $(BOH)$ are $3.2$ and $3.4$, respectively. The pH of their salt (AB) solution is :

asked Dec 11, 2018 by pady_1

0 answers

The integral $\begin{align} \int \frac{2x^{12} + 5x^9}{(x^5 + x^3 + 1)^3} dx \end{align}$ is equal to : where C is an arbitrary constant.

asked Dec 11, 2018 by pady_1

1 answer

The integral $\begin{align} \int \frac{dx}{(x+1)^{3/4} (x-2)^{5/4}}\end{align}$ is equal to:

asked Dec 11, 2018 by pady_1

1 answer

Sodium phenoxide when heated with $CO_2$ under pressure at $125^{\circ}C$ yields a product which on acetylation produces $C$. The major product C would be:

asked Dec 11, 2018 by pady_1

0 answers

The above p-v diagram represents the thermodynamic cycle of an engine, operating with an ideal monoatomic gas. The amount of heat extracted from the source in a single cycle is

asked Dec 11, 2018 by pady_1

0 answers

Which one of the following statements is correct ?

asked Dec 11, 2018 by pady_1

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The rate of a chemical reaction doubles for every $10^{\circ}C$ rise of temperature. If the temperature is raised by $50^{\circ}C$, the rate of the reaction increases by about :

asked Dec 11, 2018 by pady_1

0 answers

Let $S_1 = \displaystyle\sum_{j=1}^{10} j (j - 1)^{10} C_j, S_2 = \displaystyle\sum_{j=1}^{10} j \;^{10} C_j $ and $S_3 = \displaystyle\sum_{j=1}^{10} j^2 \;^{10} C_j $ Statement-1 : $S_3 = 55 \times 2^9$ Statement-2 : $S_1 = 90 \times 2^8$ and $S_2 = 10 \times 2^8$.

asked Dec 11, 2018 by pady_1

0 answers

The projections of a vector on the three coordinate axis are 6, -3, 2 respectively. The direction consines of the vector are

asked Nov 29, 2018 by pady_1

0 answers

A planet in a distant solar system is 10 times more massive than the earth and its radius is 10 times smaller. Given that the escape velocity from the earth is $11 kms^{-1}$, the escape velocity from the surface of the planet would be

asked Nov 29, 2018 by pady_1

0 answers

Angular momentum of the particle rotating with a central force is constant due to :

asked Nov 29, 2018 by pady_1

0 answers

Phosphorus pentacloride dissociates as follows, in a closed reaction vessel, $PCl_5 (g) \rightleftharpoons PCl_3 (g) + Cl_2(g) $ If total pressure at equilibrium of the reaction mixture is $P$ and degree of dissociation of $PCl_5$ is $x$, the partial pressure of $PCl_3$ will be :

asked Nov 13, 2018 by pady_1

0 answers

The plane $x + 2y - z = 4$ cuts the sphere $x^2 + y^2 + z^2 - x - 2 = 0 $ in a circle of radius :

asked Nov 5, 2018 by pady_1

0 answers

The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and 200 V lamp, when not in use ?

asked Nov 5, 2018 by pady_1

0 answers

A velocity $\frac{1}{4}\;m/s$ is resolved into two components along OA and OB making angle $30^{\circ}$ and $45^{\circ}$ respectively with the given velocity. Then the component along OB is

asked Nov 5, 2018 by pady_1

0 answers

In the structure of $CIF_3$, the number of Ione pair of electrons on central atom 'Cl' is

asked Aug 21, 2018 by pady_1

1 answer

During DNA replication, Okazaki fragments are used to elongate

asked Aug 21, 2018 by pady_1

1 answer

In meiosis crossing over is initiated at :

asked Aug 21, 2018 by pady_1

1 answer

Eutrophication of water bodies leading to killing of fishes is mainly due to nonavailability of -

asked Aug 21, 2018 by pady_1

0 answers

Which of the following complexes is used to be as an anticancer agent?

asked Aug 20, 2018 by pady_1

0 answers

Structure of the compound whose IUPAC name is 3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is :

asked Aug 20, 2018 by pady_1

1 answer

A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number ?

asked Aug 20, 2018 by pady_1

1 answer

Acidified $K_2Cr_2O_7$ solution turns green when $Na_2SO_3$ is added to it. This is due to the formation of :

asked Aug 16, 2018 by pady_1

1 answer

An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to:

asked Jul 26, 2018 by pady_1

2 answers

$Al_2O_3$ is reduced by electrolysis at low potentials and high currents. If $4.0\times10^{4}$ amperes of current is passed through molten $Al_2O_3$ for 6 hours, what mass of aluminium is produced ? (Assume 100% current efficiency, at. mass of$ Al = 27 g mol^{–1}$) -

asked Jul 26, 2018 by pady_1

0 answers

Which of the following complexes exhibits the highest paramagnetic behaviour ? Where gly = glycine, en = ethylenediamine and bpy = bipyridyl moities (Atomic number Ti = 22, V = 23, Fe = 26, Co = 27)

asked Jul 26, 2018 by pady_1

1 answer

Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true :

asked Jul 26, 2018 by pady_1

1 answer

Nucleophilic addition reaction will be most favoured in:-

asked Jul 25, 2018 by pady_1

0 answers

Which one of the following is expected to exhibit optical isomerism ? (en = ethylenediamine)

asked Jul 24, 2018 by pady_1

1 answer

$CN^{-}$is a strong field ligand. This is due to the fact that :-

asked Jul 24, 2018 by pady_1

1 answer

IUPAC name of the compound given below is :

asked Jul 24, 2018 by pady_1

1 answer

Which of the following is iso-electronic : -

asked Jul 23, 2018 by pady_1

1 answer

Molarity of liquid HCl if density of liq. HCl is 1.17 gm/cc : -

asked Jul 20, 2018 by pady_1

1 answer

A 300 gram radioactive sample has half life of 3 hours. After 18 hours remaining quantity will be

asked Jul 20, 2018 by pady_1

2 answers

The fertilizer which makes the soil acidic :

asked Jun 15, 2018 by pady_1

1 answer

Find the odd one out

asked Dec 31, 2015 by pady_1

0 answers

The bar graph shows the scores Brett obtained in his end of year exams. Luke's score in English was 15% higher than Brett's score in English. What was Luke's score in English?

asked Dec 31, 2015 by pady_1

1 answer

A factory makes $2548$ blackboards every week. How many items are manufactured in $\large\frac{1}{4}$ year?

asked Dec 31, 2015 by pady_1

1 answer

Diane sold a book worth \$ 850 at a loss of \$ 180. Find the selling price of the book.

asked Dec 31, 2015 by pady_1

0 answers

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