Recent questions tagged science

Which difference between water and ice results in ice floating on cold water?

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Elements in the same period have the same number of .

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The components of water can be separated by

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$CO_2$ can be easily liquefied and even solidified because

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In the preparation of temporary mount of onion peel which of the following is not used :

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The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

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The main use of salt in the diet is to

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Atoms which have same number of protons but different number of neutrons are called

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Which one of the followings sets of quantum numbers represents the highest energy level in an atom?

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A student was asked to mix the white of an egg with water and stir well. The student observed that

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What are the number of moles of $CO_2$ which contains 16 g of oxygen?

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$CO_2$ can be easily liquified and even solidified because

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The isotope used to remove the brain tumours and treatment of cancer is

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If we burn graphite,

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Electrochemical cells convert

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The heat required to raise the temperature of body by 1 K is called

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

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

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

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

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What's the lightest element in the periodic table?

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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

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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

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

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

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Which of these is a proton donor?

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

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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

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Which of the following is a correct statement:

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

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What are the most common elements in the human body?

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

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Which of the following has the highest pH value?

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How is a molecular/covalent compound formed?

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

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

asked Sep 6, 2017 by meena.p

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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

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On industrial scale sodium metal is prepared by electrolysis of fused

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Which of the following will have maximum mass

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

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

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

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Period number of element indicates

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What is a multivalent ion?

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

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

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Energy of an electron in orbit is proportional to

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As size of atom increases down group, electro positivity

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Which of the following has highest intermolecular forces of attraction?

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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

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