Recent questions tagged science

Which of the following statement is not true about colloidal solution ?

asked Sep 5, 2017 by meena.p

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Which of the following are physical changes? <br>(i) Melting of iron metal <br>(ii) Rusting of iron <br>(iii) Bending of an iron rod <br>(iv) Drawing a wire of iron metal

asked Sep 5, 2017 by meena.p

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An element X is tetravalent and another element Y is divalent . The compound formed by these two elements will be

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What happens/is likely to happen if the atoms within an element have full valence shells?

asked Sep 5, 2017 by meena.p

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Commercially concentrated HCl is

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As we go from top to bottom in a group shielding effect

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Pressure that vapors apply on surface of liquid at equilibrium is called

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Molecules of liquid which escape first have

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What is a polyatomic ion?

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Two elements X and Y have the same atomic mass but their atomic numbers are 20 and 21 respectively . X and Y are

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Concentration of a dilute solution

asked Sep 4, 2017 by meena.p

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In Rutherford's experiment, α particles were deflected because of

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Elements which have properties of metals and non-metals are

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As solid melts to form liquid:

asked Sep 4, 2017 by meena.p

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A student recorded the mass of dry raisins as $2.5\;g$ and the mass of raisins after soaking in water as $4 \;g$ . While performing the above experiment. The percentage of water absorbed by raisin is :

asked Sep 4, 2017 by meena.p

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Which of the following statement is not true about suspension ?

asked Sep 4, 2017 by meena.p

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Solubility is amount of solute dissolved in

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Mathematical expression that describes Boyle's law is

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Oxidation state of group IIIA metals is

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An electrolytic cell uses electrical energy to drive

asked Sep 4, 2017 by meena.p

2 answers

On contact with oxygen, Rubidium forms

asked Sep 4, 2017 by meena.p

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When we blow air into the balloon it inflates because:

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Which of the following is the correct set of apparatus for fractional distillation?

asked Sep 4, 2017 by meena.p

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Cathode rays have :

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Which of the following is not a postulate of Dalton’s atomic theory:

asked Sep 4, 2017 by meena.p

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The concentration of a solution indicates

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Filtration as a method of separation can be used for mixtures that are

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The movement of molecules from a higher concentration to a lower concentration is known as?

asked Sep 4, 2017 by meena.p

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The n value of the valence shell of an element indicates its?

asked Sep 4, 2017 by meena.p

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When the electron is present in a particular orbit , it?

asked Sep 4, 2017 by meena.p

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Who gave the idea that elements can be differentiated by their properties?

asked Sep 1, 2017 by meena.p

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At a particular temperature solution which cannot dissolve more solute is called

asked Sep 1, 2017 by meena.p

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By passing hydrogen gas through vegetable oil, it is converted in to

asked Sep 1, 2017 by meena.p

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For a certain reaction $PV = 2 dm^3 atm$ and volume is $4 dm^3$ then corresponding pressure is

asked Sep 1, 2017 by meena.p

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At constant pressure average kinetic energy of gas molecules increases 2 times if

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Metals difficult to oxidize are called

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How many elements are present in two molecules of aspirin? The formula for aspirin is $C_9H_8O_4$.

asked Sep 1, 2017 by meena.p

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In the separation of dyes A and B by chromatography, component B has more solubility in the solvent. Which component will rise faster?

asked Sep 1, 2017 by meena.p

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The number of valence electrons determines:

asked Aug 31, 2017 by meena.p

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The mass of a single atom of an element X is $2.65 \times 10^{-23}g$. The atomic mass and name of the element is:

asked Aug 31, 2017 by meena.p

1 answer

The stem has vessels that transport and _throughout the plant.

asked Aug 30, 2017 by priyanka.c

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Soda water is a solution of carbon dioxide in water. This solution is composed of

asked Aug 30, 2017 by meena.p

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Some statements about the Rutherford’s a-particle scattering experiment are given : I. As most of the a-particles passed through the gold foil without getting deflected, the positive charge of the atom occupies the entire space. II. As very few particles were deflected from their path, very little space inside the atom is empty. III. As a very small fraction of a-particles were deflected by 180°, all the positive charge and mass of the gold atom were concentrated in a very small volume within the atom. Select the correct statement(s).

asked Aug 30, 2017 by meena.p

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The characteristic smell of rotten egg spreads throughout the room. This is due to

asked Aug 30, 2017 by meena.p

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Which one of the following is not an element of first transition series.?

asked Aug 30, 2017 by meena.p

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Alpha particles are .......nuclie that are doubly positively charged?

asked Aug 30, 2017 by meena.p

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Which one of the following is not included in the concept of four elements.

asked Aug 30, 2017 by meena.p

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Non-metals like to _ electrons to become __ ions.

asked Aug 30, 2017 by meena.p

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As compared to beryllium, magnesium is

asked Aug 30, 2017 by meena.p

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At constant pressure average kinetic energy of gas molecules increases 2 times if

asked Aug 30, 2017 by meena.p

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