Recent questions tagged 86

Two point charges A and B, having charges +Q andQ respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges becomes :

asked Jul 8, 2019 by pady_1

1 answer

Which of the following sets of elements does not belong to transitional element set ?

asked Dec 19, 2018 by pady_1

0 answers

At $90^{\circ}C$ the concentration of $H_3O^+$ in pure water is $10^{-6}\; mol\;L^{-1}$. What is the value of $K_w$ at this temperature ?

asked Dec 19, 2018 by pady_1

0 answers

What is the value (in litres) of $CO_2$ liberated at $STP$ when $2.12 \;g$ of sodium carbonate (mol. wt. 106) is treated with excess dilute $HCl$ ?

asked Dec 19, 2018 by pady_1

0 answers

The element with atomic number 12 belongs to .......... group and ............. period :

asked Dec 11, 2018 by pady_1

0 answers

Which of the following reaction is possible at anode ?

asked Dec 11, 2018 by pady_1

0 answers

According to the kinetic theory of gases, in an ideal gas, between two successive collisions a gas molecule travels :

asked Dec 11, 2018 by pady_1

0 answers

The combustion of benzene $(l)$ gives $CO_2(g)$ and $H_2O (l)$. Given that heat of combustion of benzene at constant volume is $-3263.9 \; kJ\; mol^{-1}$ at $25^{\circ}C$; heat of combustion (in $kJ\; mol^{-1}$) of benzene at constant pressure will be - $(R = 8.314 \;JK^{-1} mol^{-1})$

asked Dec 11, 2018 by pady_1

0 answers

Which of the following reactions is an example of a redox reaction ?

asked Dec 11, 2018 by pady_1

1 answer

If the standard deviation of the numbers 2, 3, a and 11 is 3.5, then which of the following is true ?

asked Dec 11, 2018 by pady_1

1 answer

Let X be a set containing 10 elements and P(X) be its power set. If A and B are picked up at random from P(X), with replacement, then the probability that A and B have equal number of elements, is :

asked Dec 11, 2018 by pady_1

1 answer

The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1 : 4. The ratio of number of their molecule is:

asked Dec 11, 2018 by pady_1

0 answers

This question has Statement I and Statement II. Of the four choices given after the Statements, choose the one that best describes the two Statements. Statement – I : A point particle of mass m moving with speed v collides with stationary point particle of mass M. If the maximum energy loss possible is given as $f (\frac{1}{2} mv^2 )$ then $f = (\frac{m}{M+m})$. Statement – II : Maximum energy loss occurs when the particles get stuck together as a result of the collision.

asked Dec 11, 2018 by pady_1

0 answers

The increasing order of he ionic radii of the given isoelectronic species is :

asked Dec 11, 2018 by pady_1

0 answers

Which of the following reagents may be used to distinguish between phenol and benzoic acid?

asked Dec 11, 2018 by pady_1

0 answers

There are two urns. Urn A has 3 distinct red balls and urn B has 9 distinct blue balls. From each urn two balls are taken out out at random and then transferred to the other. The number of ways in which this can be done is

asked Dec 11, 2018 by pady_1

0 answers

Let $f(x) = (x+1)^2 - 1, x \geq -1$ Statement -1 : The set $\{ x : f(x) = f^{-1} (x) \} = \{0, -1\}$ Statement-2: f is a bijection.

asked Nov 29, 2018 by pady_1

1 answer

This question contains Statement -1 and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements. Statement – I: For a mass M kept at the centre of a cube of side ‘a’, the flux of gravitational field passing through its sides is $4\pi GM.$. and Statement – II If the direction of a field due to a point source is radial and its dependence on the distance ‘r’ for the source is given as $\frac{1}{r^2}$,its flux through a closed surface depends only on the strength of the source enclosed by the surface and not on the size or shape of the surface

asked Nov 29, 2018 by pady_1

0 answers

Which one of the following has a square planar geometry ? (At. no. Co = 27, Ni = 28, Fe = 26, Pt = 78)

asked Nov 29, 2018 by pady_1

0 answers

In $Fe(CO)s$, the $Fe-C$ bond possesses :

asked Nov 13, 2018 by pady_1

0 answers

The highest electrical conducitivity of the following aqueous solutions is of :

asked Nov 5, 2018 by pady_1

0 answers

Which one of the following has the regular tetrahedral structure ?

asked Nov 5, 2018 by pady_1

1 answer

On which of the following properties does the coagulating power of an ion depend ?

asked Aug 21, 2018 by pady_1

1 answer

Select the mismatch :

asked Aug 21, 2018 by pady_1

1 answer

Which one of the following is the starter codon ?

asked Aug 21, 2018 by pady_1

1 answer

Which of the following is not a function of the skeletal system?

asked Aug 21, 2018 by pady_1

1 answer

Among the following sets of reaction which one produces anisole?

asked Aug 20, 2018 by pady_1

1 answer

Which is the monomer of Neoprene in the following ?

asked Aug 20, 2018 by pady_1

1 answer

Which one of the alkali metals, forms only, the normal oxide, $M_2O$ on heating in air ?

asked Aug 20, 2018 by pady_1

1 answer

The value of $\Delta H$ for the reaction $X_{2(g)} + 4Y_{2(g)} \rightleftharpoons 2XY_{4(g)}$ is less than zero. Formation of $XY_{4(g)}$ will be favoured at :

asked Aug 16, 2018 by pady_1

1 answer

The correct order of the decreasing ionic radii among the following isoelectronic species is :

asked Jul 26, 2018 by pady_1

1 answer

Which of the following compounds will exhibit cis-trans (geometrical) isomerism ?

asked Jul 26, 2018 by pady_1

1 answer

Which of the following statements is not correct ?

asked Jul 26, 2018 by pady_1

1 answer

The product formed in Aldol condensation is :

asked Jul 26, 2018 by pady_1

1 answer

Ethylene oxide when treated with Grignard reagent yields:-

asked Jul 25, 2018 by pady_1

0 answers

What is the correct relationship between the pHs of isomolar solutions of sodium oxide ($pH_1$ ), sodium sulphide ($pH_2$ ), sodium selenide ($pH_3$ ) and sodium telluride ($pH_4$) ?

asked Jul 24, 2018 by pady_1

1 answer

Standard enthalpy and standard entropy changes for the oxidation of ammonia at 298 K are$-382.64KJ mol^{-1}$and $-145.6KJ^{-1} mol^{-1}$, respectively. Standard Gibbs energy change for the same reaction at 298 K is :-

asked Jul 24, 2018 by pady_1

2 answers

Which one of the following octahedral complexes will not show geometric isomerism ? (A and B are monodentate ligands)

asked Jul 24, 2018 by pady_1

1 answer

asked Jul 23, 2018 by pady_1

1 answer

Coordination number of $Ni$ in $[Ni(C_2O_4)_3] ^{4-}$ is

asked Jul 20, 2018 by pady_1

1 answer

Which compound has planar structure :

asked Jul 20, 2018 by pady_1

1 answer

The IUPAC name of $[Co(NH_3)_3)ClBrNO_2]$ will be :

asked Jun 15, 2018 by pady_1

1 answer

wife: woman : : _______ : man

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 mean?

asked Dec 31, 2015 by pady_1

1 answer

Find the area of a rectangle whose length is 15 cm and breadth is 50 mm.

asked Dec 31, 2015 by pady_1

0 answers

A candy store has 5 lbs of ***** to use for free samples. They want to give away samples that are each $\large\frac{1}{8}$ of a pound. How many samples will they be able to give away?

asked Dec 31, 2015 by pady_1

1 answer

Find Principal when Time = 5 years, Interest = \$ 500; Rate = $5\%$ p.a.

asked Dec 31, 2015 by pady_1

1 answer

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