Recent questions tagged olympiad

When NaCl is dissolved in water, negative end of water molecules is attracted towards

asked Sep 6, 2017 by meena.p

1 answer

Which of the following refers to the chemical reaction that links monomers to form polymers and that releases water?

asked Sep 6, 2017 by meena.p

1 answer

What is the substance that increases the rate of a reaction by lowering the activation energy?

asked Sep 6, 2017 by meena.p

1 answer

Which statement best explains why a tree branch floats on water?

asked Sep 6, 2017 by meena.p

1 answer

What's the lightest element in the periodic table?

asked Sep 6, 2017 by meena.p

1 answer

The mass of $P_4O_{10}$ that will be obtained from the reaction of $1.33\; gram$ of $P_4$ and $5.07$ of oxygen is

asked Sep 6, 2017 by meena.p

1 answer

The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called

asked Sep 6, 2017 by meena.p

1 answer

Molarity of solution which contains $40 \;g$ urea dissolved in $500\;cm^3$ is

asked Sep 6, 2017 by meena.p

1 answer

How many electrons, protons and neutrons are present in X+ , if atomic number of X is 19 and its mass number is 39

asked Sep 6, 2017 by meena.p

1 answer

Which of these is a proton donor?

asked Sep 6, 2017 by meena.p

1 answer

Which of these is a property of ice that allows fish to survive in ponds when air temperatures are below $0^{\circ}$ C?

asked Sep 6, 2017 by meena.p

1 answer

A student is pouring equal amounts of water, maple syrup, and cooking oil into a glass beaker and looking at how the layers settle. Which property of the liquids is the student most likely comparing?

asked Sep 6, 2017 by meena.p

1 answer

Which of the following is a correct statement:

asked Sep 6, 2017 by meena.p

1 answer

We get the smell of hot food in the kitchen outside the house because of:

asked Sep 6, 2017 by meena.p

1 answer

What are the most common elements in the human body?

asked Sep 6, 2017 by meena.p

1 answer

Which of the following is not produced if you mix vinegar (an acid) and sodium bicarbonate (an alkali, or base) together?

asked Sep 6, 2017 by meena.p

1 answer

Which of the following has the highest pH value?

asked Sep 6, 2017 by meena.p

1 answer

How is a molecular/covalent compound formed?

asked Sep 6, 2017 by meena.p

1 answer

Hair contains keratin proteins which are also present in nails and wool is an example of

asked Sep 6, 2017 by meena.p

2 answers

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

asked Sep 6, 2017 by meena.p

1 answer

In a sample of ethyl ethanoate $(CH_3COOC_2H_5 )$ the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?

asked Sep 5, 2017 by meena.p

1 answer

On industrial scale sodium metal is prepared by electrolysis of fused

asked Sep 5, 2017 by meena.p

1 answer

Which of the following will have maximum mass

asked Sep 5, 2017 by meena.p

1 answer

Which of the following is NOT an indicator of a Chemical Reaction?

asked Sep 5, 2017 by meena.p

1 answer

When NaCl is dissolved in water, negative end of water molecules is attracted towards

asked Sep 5, 2017 by meena.p

1 answer

Mass of $NaOH$ present per $dm^3$ of $0.25\;M\; NaOH$ solution is

asked Sep 5, 2017 by meena.p

1 answer

Period number of element indicates

asked Sep 5, 2017 by meena.p

1 answer

What is a multivalent ion?

asked Sep 5, 2017 by meena.p

1 answer

If Z represents the atomic number and A represents mass number then the number of electrons in an atom can be computed as

asked Sep 5, 2017 by meena.p

1 answer

Molarity of solution which contains $40\; g$ urea dissolved in $500cm^3$ is

asked Sep 5, 2017 by meena.p

1 answer

Energy of an electron in orbit is proportional to

asked Sep 5, 2017 by meena.p

1 answer

As size of atom increases down group, electro positivity

asked Sep 5, 2017 by meena.p

1 answer

Which of the following has highest intermolecular forces of attraction?

asked Sep 5, 2017 by meena.p

1 answer

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

Ask Questions, Get Answers