Recent questions tagged class 10

The lens which can form a virtual, erect, magnified image is

asked Sep 14, 2017 by priyanka.c

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A man wishes to use a concave mirror of 50cm as a magnifying glass. Upto what distance can you stand from the mirror?

asked Sep 14, 2017 by priyanka.c

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Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?

asked Sep 14, 2017 by meena.p

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Focal length of a concave mirror depends upon

asked Sep 14, 2017 by priyanka.c

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The blue colour of the sky is due to

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The electrolytic decomposition of water gives $H_2$ and $O_2$ in the ratio of

asked Sep 14, 2017 by meena.p

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The power of accommodation of the eye decreases due to aging, this defect is called

asked Sep 14, 2017 by priyanka.c

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Which of the following hydroxides is most basic?

asked Sep 14, 2017 by meena.p

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Sodium is most likely to form a compound with which one of these elements?

asked Sep 14, 2017 by meena.p

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Which of the following is an example of a colloid?

asked Sep 14, 2017 by meena.p

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Order the following forms of matter from smallest to largest.

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An element has an atomic number of 15 with which of the following elements will it show similar chemical properties.

asked Sep 13, 2017 by meena.p

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Which of the following gases can be used for storage of fresh sampel of an oil for a long time?

asked Sep 13, 2017 by meena.p

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Nail polish remover contains ?

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Conditions for equilibrium of concentration of reactant and products will be same if

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Strands of DNA are held together by

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Methyl orange is

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An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be :

asked Sep 13, 2017 by meena.p

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In the reaction $2PbO + C \to 2Pb + CO_2$ (a) lead is getting reduced (b) carbon dioxide is getting oxidised (c) lead oxide is getting reduced. (d) carbon is getting reduced.

asked Sep 13, 2017 by meena.p

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Addition of hydrogen to ethene forms

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In magnetic separation, magnets are used to separate

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The inert gases are ____ in water

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The substance which, on treating with chlorine, yields bleaching powder is

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A student adds 2 mL of acetic acid to a test tube containing 2 mL of distilled water. He then shakes the test tube well and leaves it to settle for some time. After about 5 minutes he observes that in the test tube there is :

asked Sep 13, 2017 by meena.p

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The by product of soap is

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Bleaching action of chlorine is by

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The method of concentrating the ore which makes use of the difference in density between ore and impurities is called

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What is Calcium sulphate ?

asked Sep 13, 2017 by meena.p

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Which order of relative size amongst the following is incorrect?

asked Sep 13, 2017 by meena.p

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In the following equations: $Na_2CO3 + xHCl → 2NaCl + CO_2 + H_2O$ the value of x is

asked Sep 13, 2017 by meena.p

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Match the articles given m Column-! with the fibres/plastics from which they are made in Column-H.

asked Sep 13, 2017 by meena.p

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Which one of the following is the softest?

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Which of the following gases can be used for storage of fresh sample of an oil for a long time?

asked Sep 13, 2017 by meena.p

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A student Prepared $20\%$ sodium hydroxide solution in a beaker to study saponification reaction. Some observations related to this are given below (I) Sodium hydroxide solution turns red litmus blue (II) Sodium hydroxide readily dissolves in water (III) The beaker containing solution appears cold when touched from outside (IV) The blue litmus paper turns red when dipped into the solution The correct observations are :

asked Sep 13, 2017 by meena.p

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The method of concentrating the ore which makes use of the difference in density between ore and impurities is called

asked Sep 13, 2017 by meena.p

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The formula $C_6H_5-CO-CH_3$ represents

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Covalent compounds

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In the third period of the periodic table the element having smallest size is

asked Sep 13, 2017 by meena.p

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Carbon exists in the atmosphere in the form of

asked Sep 13, 2017 by meena.p

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The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?

asked Sep 13, 2017 by meena.p

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Reaction of any substance with air is called

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Almost 95% of compounds are of carbon because it can form

asked Sep 12, 2017 by meena.p

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Property due to which water acts as a universal solvent is

asked Sep 12, 2017 by meena.p

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Which of the following does not form an acidic salt?

asked Sep 12, 2017 by meena.p

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An element belongs to period 2 and group 2 the number of valence electrons in the atoms of this element is.

asked Sep 12, 2017 by meena.p

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An aluminium strip is kept immersed in freshly prepared ferrous sulphate solution taken in a test tube, the change observed is that

asked Sep 12, 2017 by meena.p

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The isotope atoms differ in ?

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Natural rubber is a polymer derived from ?

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Which of the following is not a straight chain hydrocarbon?

asked Sep 12, 2017 by meena.p

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On moving from left to right in a period in the periodic table, the size of the atom.

asked Sep 12, 2017 by meena.p

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