Recent questions in Chemistry

The purity of compound is confirmed by

asked Aug 3, 2018 by meena.p

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Which of the following is an application of surface tension?

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On increasing the temperature, the surface tension of the liquid

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Select the incorrect statement from the following option.

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Shapes of drops of liquid are spherical because of

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Select the incorrect statement from the following option.

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According to Newton's law of viscosity, the maximum velocity of flow is at

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The boiling point and molar heat of vaporisation is dependent on

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For a given substance, choose the correct statement.

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The quadratic equation for the graph is

asked Aug 2, 2018 by meena.p

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The surface tension of water at $25^{\circ}\;C$ is

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The unit of surface tension in CGS system is

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Which of the following will vaporize faster ?

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How aniline and chloroform can be separated?

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The process of heating a liquid mixture to form vapours and then cooling the vapours to get pure component is called

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The temperature at which solid and liquid coexist in equilibrium is called

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At 1 atm pressure, the boiling point of water is

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Select the incorrect statement from the following options.

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The molar heat of vaporisation $(\Delta \;H_{vap})$ for water is

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A 1.50 gram sample of urea is dissolved in 105.0 gram of water and produces a solution that boils at $100.12^{\circ}C$ . From these data , what is the molecular mass of urea?

asked Aug 1, 2018 by meena.p

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How many grams of $NaOH$ are dissolved in 200. milliliters of solution if its concentration is $1.50\;M$

asked Aug 1, 2018 by meena.p

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How many grams of NaCl are needed to prepare 200 gram of a 10 % salt solution ?

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How much heat is needed to change 100.0 gram of ice at $273\;K$ to steam at $373\;K$?

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The normal boiling point of a liquid is the temperature at which it boils when the external pressure is

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The boiling point of a liquid is the temperature at which the vapour pressure

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On increasing the temperature of a liquid, its vapour pressure

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Which of the following correctly states how the viscosities of a liquid and a gas will change with temperature?

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The viscous force the relative motion between the adjacent layers of a fluid in motion. Which one of the flowing fits best in the sentence?

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Water flows between two plates of which the upper one is stationary and the lower one is moving with a velocity V. What will be the velocity of the fluid in contact with the upper plate?

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Hydrogen diffuses six times faster than gas A The molar mass of gas A is

asked Jul 31, 2018 by meena.p

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In the equation of state of an ideal gas PV = n RT, the value of the universal gas constant would depend only on

asked Jul 31, 2018 by meena.p

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In order to increase the volume of a gas by 10%, the pressure of the gas should be

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If a gas expands at constant temperature, it indicates that:

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How large a balloon could you fill with $4\;g$ of He gas at $22^{\circ}C$ and 720 mm of Hg?

asked Jul 31, 2018 by meena.p

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A gas occupies one litre under atmospheric pressure. What will be the volume of the same amount of gas under 750 mm of Hg at the same temperature?

asked Jul 31, 2018 by meena.p

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Which sample demonstrates particles arranged in a regular geometric pattern?

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The amount of energy needed to change a substance from a solid phase to a liquid phase is __________ .

asked Jul 31, 2018 by meena.p

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The energy of second Bohr orbit of hydrogen atom is $-328\;kJ mol^{-1}$ , hence energy of fourth Bohr orbit would be

asked Jul 30, 2018 by meena.p

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A bulb emits light of wavelength $4500\;A$ . The bulb is rated as $150\;walt$ and $8\%$ of the energy is emitted as light. How many photons are emitted by the bulb per second .

asked Jul 30, 2018 by meena.p

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A certain particle carries $2.5 \times 10^{-16}\;C$ of static electric charge. Calculate the number of electrons present in it .

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The electron of the same orbitals can be distinguished by

asked Jul 27, 2018 by meena.p

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Find the wavelength of 100 g particle moving with velocity $100 ms^{-1}$

asked Jul 27, 2018 by meena.p

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A moving electron has $5 \times 10^{-25}$ joules of kinetic energy. What is the de-Brogile wavelength ?

asked Jul 27, 2018 by meena.p

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Sodium street lamp gives off a characteristic yellow light of wave length $588\;nm$ calculate the energy mole (in KJ/mol) of these photons .

asked Jul 27, 2018 by meena.p

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Calculate the wave number for the shortest wavelength transition in the Balmer series of atomic hydrogen .

asked Jul 27, 2018 by meena.p

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Calculate the wavelength and energy of radiation emitted for the electronic transition from infinity to stationary state on of the hydrogen atom .

asked Jul 27, 2018 by meena.p

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Maximum number of electrons in a subshell with $f=3$ and $n=4$

asked Jul 26, 2018 by meena.p

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If $n=6$, the correct sequence for filling of electrons will be

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The total number of atomic orbitals in fourth energy level of an atom is

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The correct set of four quantum number for the valence electron of rubidium atom $(Z=37)$ is :

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