Recent questions in Olympiad-Science

Arun, Deepa, Uma and Priya were asked to select a plant material which would not give blue black colour with iodine solution. Who did not select the right material ?

asked Sep 5, 2017 by meena.p

1 answer

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

asked Sep 5, 2017 by meena.p

0 answers

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

1 answer

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

asked Sep 5, 2017 by meena.p

1 answer

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

asked Sep 5, 2017 by meena.p

1 answer

Commercially concentrated HCl is

asked Sep 5, 2017 by meena.p

1 answer

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

asked Sep 5, 2017 by meena.p

1 answer

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

asked Sep 5, 2017 by meena.p

1 answer

Molecules of liquid which escape first have

asked Sep 5, 2017 by meena.p

1 answer

What is a polyatomic ion?

asked Sep 5, 2017 by meena.p

1 answer

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

asked Sep 5, 2017 by meena.p

1 answer

Concentration of a dilute solution

asked Sep 4, 2017 by meena.p

1 answer

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

asked Sep 4, 2017 by meena.p

1 answer

Elements which have properties of metals and non-metals are

asked Sep 4, 2017 by meena.p

1 answer

As solid melts to form liquid:

asked Sep 4, 2017 by meena.p

1 answer

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

1 answer

Which of the following statement is not true about suspension ?

asked Sep 4, 2017 by meena.p

1 answer

Solubility is amount of solute dissolved in

asked Sep 4, 2017 by meena.p

1 answer

Mathematical expression that describes Boyle's law is

asked Sep 4, 2017 by meena.p

1 answer

Oxidation state of group IIIA metals is

asked Sep 4, 2017 by meena.p

1 answer

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

1 answer

When we blow air into the balloon it inflates because:

asked Sep 4, 2017 by meena.p

1 answer

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

asked Sep 4, 2017 by meena.p

1 answer

Cathode rays have :

asked Sep 4, 2017 by meena.p

1 answer

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

asked Sep 4, 2017 by meena.p

1 answer

The concentration of a solution indicates

asked Sep 4, 2017 by meena.p

1 answer

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

asked Sep 4, 2017 by meena.p

1 answer

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

asked Sep 4, 2017 by meena.p

1 answer

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

asked Sep 4, 2017 by meena.p

1 answer

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

asked Sep 4, 2017 by meena.p

1 answer

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

asked Sep 1, 2017 by meena.p

0 answers

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

asked Sep 1, 2017 by meena.p

1 answer

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

asked Sep 1, 2017 by meena.p

1 answer

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

1 answer

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

asked Sep 1, 2017 by meena.p

0 answers

Metals difficult to oxidize are called

asked Sep 1, 2017 by meena.p

1 answer

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

1 answer

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

1 answer

The number of valence electrons determines:

asked Aug 31, 2017 by meena.p

1 answer