Recent questions tagged science

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 ?

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Which order of relative size amongst the following is incorrect?

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

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

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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?

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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 :

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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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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

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Carbon exists in the atmosphere in the form of

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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?

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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

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Property due to which water acts as a universal solvent is

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Which of the following does not form an acidic salt?

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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.

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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

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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?

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

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The following reaction is an example of a $ 4H_3(g)+5O_2(g) \to 4NO+6H_2O$ a. Displacement reaction b. Combination reaction c. Redox reaction d. Neutralisation reaction

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What is a mixture of potassium nitrate powdered charcoal and sulphur called?

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

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The isomeric pair is

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Which of the following is formed when sodium hydroxide reacts with hydrochloric acid?

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KOH is used in making of

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Which information is not conveyed by a balanced chemical equation?

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Loss of hydrogen halide from alkyl halide gives

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Which of the following gives the correct increasing order of the atomic radii of O, F and N?

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Which of the following is not a decomposition reaction

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

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

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Reaction between X and Y, forms compound Z. X loses electron and Y gains electron. Which of the following properties is not shown by Z?

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Water in swimming pools is purified by adding

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What is a mixture of potassium nitrate powdered charcoal and sulphur called?

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The Ph of a solution of HCL is 4. This shows that the molarity of the solution is

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Soaps are formed by saponification of

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Graphite differs from Diamond because graphite is:

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Mineral acids are stronger acids than carboxylic acids because i. mineral acids are completely ionized ii. carboxylic acids are completely ionized iii. mineral acids are partially ionized iv. carboxylic acids are partially ionized

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Element X forms a chloride with the formula XCl2 , which is a solid with a high melting point . x would most likely be in the same group of the periodic table as

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Naturally occurring metallic compounds are called

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What is the Name of Scientist, who stated that matter can be converted into energy

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When ozone absorbs UV radiation, energy is converted in to

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Which of the following is used for dissolution of gold?

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What among following is used to produce artificial rain ?

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