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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
8051. |
Aliphatic hydrocarbons have been classified as alkanes ________ and alkynes. |
Answer» SOLUTION :ALKENES | |
8052. |
Alcohos produce H_(2) gas on reaction with : |
Answer» Zn |
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8053. |
Alcohols react with sodium metal to liberate oxygen gas. |
Answer» Solution :Alcohols REACT with sodium metal to LIBERATE hydrogen GAS. | |
8054. |
Alcohols are oxidised to…………. . |
Answer» SOLUTION :CARBOXYLIC ACIDS | |
8055. |
"Alcohol is harmful as beverages." - Justify the statement. |
Answer» Solution :When a LARGE quantity of ethanol is consumed, it tends to slow down metabolic processes. Moreover, it depresses the Central Nervous System (CNS). This results in lack of coordination, mental confusion, drowsiness, lowering of the normal inhibitors and finally individual becomes unconscious and lethargic. The individual may feel relaxed but does not realised that his sense of judgement, sense of timing and muscular coordination have been seriously IMPAIRED. Instead of ethanol, intake of methanol in very small quantities can CAUSE death, because methanol is oxidised to methanal in liver. Methanal reacts rapidly with the components of cells and coagulates the protoplasm. Methanol also affects the OPTIC NERVE and causes blindness. Thus, consumption of alcohol is dangerous to living beings. |
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8056. |
Alclad' is perfectly resistant to corrosion by sea water. The alloy is |
Answer» MAGNALIUM COATED with aluminium |
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8058. |
Al wires are used as electric cables due to their silvery white colour. |
Answer» |
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8060. |
Air is regarded as a mixture because |
Answer» its PRESSURE MAY vary |
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8062. |
Aim: To study the reaction between zinc metal and dilute sulphuric acid. Caution: Use the acid with care. Activity: Take a conical flask. Add a piece of zinc granules in it. Then add dilute hydrochloric acid or dilute sulphuric acid. Which type of reaction takes place between the pieces of zinc and dilute HCI ? |
Answer» Solution :Reaction taking PLACE between zinc GRANULES and DILUTE HCI is an exothermic reaction. | |
8063. |
Aim: To study the reaction between zinc metal and dilute sulphuric acid. Caution: Use the acid with care. Activity: Take a conical flask. Add a piece of zinc granules in it. Then add dilute hydrochloric acid or dilute sulphuric acid. What happens to the conical flask ? |
Answer» SOLUTION :Conical FLASK becomes HOT which can be felt on touching to it. | |
8064. |
Aim: To study the reaction between zinc metal and dilute sulphuric acid. Caution: Use the acid with care. Activity: Take a conical flask. Add a piece of zinc granules in it. Then add dilute hydrochloric acid or dilute sulphuric acid. State the reaction occurring between the pieces of zinc and dilute HCl. |
Answer» SOLUTION :` Zn(s) + 2HCL(aq) toZnCl_(2)(aq) + H_(2)(G)` | |
8065. |
Aim: To study the reaction between zinc metal and dilute sulphuric acid. Caution: Use the acid with care. Activity: Take a conical flask. Add a piece of zinc granules in it. Then add dilute hydrochloric acid or dilute sulphuric acid. What appears around the zinc granules ? |
Answer» Solution :The granules of ZINC react with dilute HYDROCHLORIC acid evolving hydrogen GAS. HENCE, bubbles of hydrogen gas APPEAR around granules of zinc. | |
8066. |
Aim : To study the reaction between lead nitrate and potassium iodide. Activity: Take lead nitrate solution in a test tube. Add the solution of potassium iodide in it. Identify the type of the above reaction. |
Answer» SOLUTION :This REACTION is a DOUBLE DISPLACEMENT reaction. | |
8067. |
Aim : To study the reaction between lead nitrate and potassium iodide. Activity: Take lead nitrate solution in a test tube. Add the solution of potassium iodide in it. What is the colour of PbI_(2) ? |
Answer» SOLUTION :`PbI_(2)` is YELLOW. | |
8068. |
Aim : To study the reaction between lead nitrate and potassium iodide. Activity: Take lead nitrate solution in a test tube. Add the solution of potassium iodide in it. What is the colour of an aqueous solution of potassium iodide ? |
Answer» SOLUTION : The solution of POTASSIUM IODIDE is COLOURLESS. | |
8069. |
Aim : To study the reaction between lead nitrate and potassium iodide. Activity: Take lead nitrate solution in a test tube. Add the solution of potassium iodide in it. Write the balanced chemical equation for the reaction that takes place between lead nitrate and potassium iodide. |
Answer» Solution :`PB(NO_(3))_(2)(AQ)+ 2KI(aq) to Pbl_(2)(s)+2KNO_(3)` | |
8070. |
Aim : To study the reaction between lead nitrate and potassium iodide. Activity: Take lead nitrate solution in a test tube. Add the solution of potassium iodide in it. What is the colour of lead nitrate solution ? |
Answer» SOLUTION :LEAD NITRATE solution is COLOURLESS. | |
8071. |
Aim: To study the reaction between calcium oxide and water. Activity: Take some quick lime (Calcium oxide - CaO) in a beaker. Add water to it slowly. Touch the beaker as shown in the figure 1.3. What is slaked lime ? |
Answer» Solution :CALCIUM HYDROXIDE `(Ca(OH)_(2))` is known as slaked lime. | |
8072. |
Aim: To study the reaction between calcium oxide and water. Activity: Take some quick lime (Calcium oxide - CaO) in a beaker. Add water to it slowly. Touch the beaker as shown in the figure 1.3. What do you feel by touching the beaker outside ? |
Answer» SOLUTION :By touching the BEAKER, it is OBSERVED that the beaker becomes warm since, heat is evolved during REACTION. | |
8073. |
Aim : To study the displacement reaction taking place between iron nail and solution of copper sulphate. Activity: Take three iron nails and clean their surface by rubbing them with a sand paper. Take two test tubes labelled as (A) and (B). Take about 10 mL solution of copper sulphate in each test tube. Tie two iron nails with a thread and immerse them in copper sulphate solution for about 20 minutes. Keep one iron nail aside for comparison. Take out the iron nails from the copper sulphate solution after 20 minutes. Compare the colour of both iron nails with the nail kept aside. Compare the intensity of the colour of copper sulphate solutions of both the test tubes, (A) and (B). What type of chemical reaction occur, when iron nail is dipped in copper sulphate solution ? |
Answer» SOLUTION : Reaction of IRON nail with the solution of copper sulphate is a DISPLACEMENT reaction. | |
8074. |
Aim: To study the reaction between calcium oxide and water. Activity: Take some quick lime (Calcium oxide - CaO) in a beaker. Add water to it slowly. Touch the beaker as shown in the figure 1.3. What is called the reaction occurring between quick lime and water ? |
Answer» SOLUTION :REACTION occurring between slaked lime and water is called SLAKING of lime. | |
8075. |
Aim: To study the reaction between calcium oxide and water. Activity: Take some quick lime (Calcium oxide - CaO) in a beaker. Add water to it slowly. Touch the beaker as shown in the figure 1.3. What is formed by reaction of quick lime with water ? Write reaction. |
Answer» Solution :The REACTION between QUICK lime and water forms `CA(OH)_(2)` `CaO(s)+ H_(2)O(I) to Ca(OH)_(2)(aq)` |
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8076. |
Aim : To study the displacement reaction taking place between iron nail and solution of copper sulphate. Activity: Take three iron nails and clean their surface by rubbing them with a sand paper. Take two test tubes labelled as (A) and (B). Take about 10 mL solution of copper sulphate in each test tube. Tie two iron nails with a thread and immerse them in copper sulphate solution for about 20 minutes. Keep one iron nail aside for comparison. Take out the iron nails from the copper sulphate solution after 20 minutes. Compare the colour of both iron nails with the nail kept aside. Compare the intensity of the colour of copper sulphate solutions of both the test tubes, (A) and (B). Which reaction takes place when iron nail is dipped in the solution of copper sulphate ? |
Answer» Solution :`FE(s)+ underset("Copper SULPHATE")(CuSO_(4)) to underset("IRON sulphate")(FeSO_(4)(AQ))+ Cu(s)` | |
8077. |
Aim : To study the displacement reaction taking place between iron nail and solution of copper sulphate. Activity: Take three iron nails and clean their surface by rubbing them with a sand paper. Take two test tubes labelled as (A) and (B). Take about 10 mL solution of copper sulphate in each test tube. Tie two iron nails with a thread and immerse them in copper sulphate solution for about 20 minutes. Keep one iron nail aside for comparison. Take out the iron nails from the copper sulphate solution after 20 minutes. Compare the colour of both iron nails with the nail kept aside. Compare the intensity of the colour of copper sulphate solutions of both the test tubes, (A) and (B). What would be the change in colour of solution of copper sulphate ? |
Answer» Solution :Blue COLOUR of copper sulphate solution fades (or BECOMES LIGHT blue). | |
8078. |
Aim : To study the displacement reaction taking place between iron nail and solution of copper sulphate. Activity: Take three iron nails and clean their surface by rubbing them with a sand paper. Take two test tubes labelled as (A) and (B). Take about 10 mL solution of copper sulphate in each test tube. Tie two iron nails with a thread and immerse them in copper sulphate solution for about 20 minutes. Keep one iron nail aside for comparison. Take out the iron nails from the copper sulphate solution after 20 minutes. Compare the colour of both iron nails with the nail kept aside. Compare the intensity of the colour of copper sulphate solutions of both the test tubes, (A) and (B). What would be the colour of iron nail placed in the solution of CuSO_(4)? |
Answer» SOLUTION : Iron NAIL become brownish in COLOUR. | |
8079. |
Aim : To study the decomposition of lead nitrate. Activity: Take about 2g of lead nitrate powder in a boiling tube. Hold the boiling tube with a pair of tongs and heat it over the flame of a burner. Which gas is evolved from boiling tube on heating lead nitrate ? |
Answer» Solution :NITROGEN dioxide (`NO_(2)`) is evolved from the BOILING tube on heating lead nitrate. It is brown coloured GAS. | |
8080. |
Aim : To study the decomposition of lead nitrate. Activity: Take about 2g of lead nitrate powder in a boiling tube. Hold the boiling tube with a pair of tongs and heat it over the flame of a burner. Write the equation of reaction of heating lead nitrate. |
Answer» Solution :`underset("LEAD nitrate")(2Pb(NO_(3))_(2)(s) )overset("Heat")to underset("Lead oxide")(2PbO(s))+underset("Nitrogen dioxide (brown GAS)")(NO_(2)(g))+underset("Oxygen")(O_(2)(g))` | |
8081. |
Aim : To study the decomposition of ferrous sulphate on heating Activity: Take approximately 2 g of ferrous sulphate crystals in a dry boiling tube. Heat the boiling tube over the flame of a burner. Observe the colour of the ferrous sulphate crystals carefully during the heating. Observe the colour of the crystals after heating it. On heating ferrous sulphate in boiling tube, a gas evolved which has a characteristic smell. What is its reason ? |
Answer» Solution :On heating ferrous sulphate, a GAS having specific SMELL is evolved due to COMBUSTION of sulphur. The combustion of sulphur forms `SO_(2)(g)` and `SO_(3)(g)` which possesses strong irritating smell. | |
8082. |
Aim: To study the burning of magnesium ribbon in air. Caution : It is necessary that this activity should be performed in the presence of a teacher. For safety purpose, teacher and student should wear goggles. Activity: Take approximately 3-4 cm long magnesium ribbon and make it clean by rubbing it with sand paper. Hold it with a pair of tongs and heat on the flame of burner or spirit lamp and the ash being formed collects in the watch-glass as shown in the figure 1.1. Collected ash in the watch-glass isof magnesium oxide. Burn the magnesium ribbon. Keeping it away as far as possible from your eyes. What is the composition of ash collected in watch-glass ? |
Answer» Solution :WHITE ash collected in watch-glass is of magnesium oxide (MGO). Note : Due to `O_(2)` and `N_(2)` present in air, Mgo is formed as a major product, moreover traces of `Mg_(3)N_(2)` is ALSO OBTAINED. |
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8083. |
Aim : To study the decomposition of ferrous sulphate on heating Activity: Take approximately 2 g of ferrous sulphate crystals in a dry boiling tube. Heat the boiling tube over the flame of a burner. Observe the colour of the ferrous sulphate crystals carefully during the heating. Observe the colour of the crystals after heating it. Which colour is observed on heating the crystals of ferrous sulphate ? |
Answer» SOLUTION :On HEATING the ferrous sulphate, it is decomposed into `Fe_(2)O_(3)` and GREEN colour changes to (reddish) brown. | |
8084. |
Aim: To study the burning of magnesium ribbon in air. Caution : It is necessary that this activity should be performed in the presence of a teacher. For safety purpose, teacher and student should wear goggles. Activity: Take approximately 3-4 cm long magnesium ribbon and make it clean by rubbing it with sand paper. Hold it with a pair of tongs and heat on the flame of burner or spirit lamp and the ash being formed collects in the watch-glass as shown in the figure 1.1. Collected ash in the watch-glass isof magnesium oxide. Burn the magnesium ribbon. Keeping it away as far as possible from your eyes. Write the chemical reaction of forming the magnesium oxide. |
Answer» Solution :`2MG(s)+O_(2)(G) overset("Heat")to 2MgO(s)` | |
8085. |
Aim: To study the burning of magnesium ribbon in air. Caution : It is necessary that this activity should be performed in the presence of a teacher. For safety purpose, teacher and student should wear goggles. Activity: Take approximately 3-4 cm long magnesium ribbon and make it clean by rubbing it with sand paper. Hold it with a pair of tongs and heat on the flame of burner or spirit lamp and the ash being formed collects in the watch-glass as shown in the figure 1.1. Collected ash in the watch-glass isof magnesium oxide. Burn the magnesium ribbon. Keeping it away as far as possible from your eyes. Which type of flame is formed during the burning of magnesium ribbon? |
Answer» Solution :Magnesium ribbon BURNS with DAZZLING white FLAME in the flame of BURNER. | |
8086. |
Aim : To study the decomposition of ferrous sulphate on heating Activity: Take approximately 2 g of ferrous sulphate crystals in a dry boiling tube. Heat the boiling tube over the flame of a burner. Observe the colour of the ferrous sulphate crystals carefully during the heating. Observe the colour of the crystals after heating it. What is the colour of crystals of ferrous sulphate ? |
Answer» Solution :The CRYSTALS of FERROUS sulphate are greenish (or faint or LIGHT GREEN). | |
8087. |
Aim : To study photochemical decomposition of silver chloride. Activity: Take about 2 g of silver chloride in a china dish. Put this china dish in sunlight for some time. State the chemical equation of decomposition reaction of silver chloride and silver bromide in presence of sunlight. |
Answer» Solution :`2AgCl(s) overset("SUNLIGHT")to 2Ag(s)+Cl_(2)(G)`<BR> `2AgBr(s) overset("Sunlight")to 2Ag(s)+Br_(2)(g)` | |
8088. |
Aim: To study the burning of magnesium ribbon in air. Caution : It is necessary that this activity should be performed in the presence of a teacher. For safety purpose, teacher and student should wear goggles. Activity: Take approximately 3-4 cm long magnesium ribbon and make it clean by rubbing it with sand paper. Hold it with a pair of tongs and heat on the flame of burner or spirit lamp and the ash being formed collects in the watch-glass as shown in the figure 1.1. Collected ash in the watch-glass isof magnesium oxide. Burn the magnesium ribbon. Keeping it away as far as possible from your eyes. What is the colour of magnesium ribbon initially ? |
Answer» Solution :Magnesium ribbon, INITIALLY, RUBBED with SAND paper APPEARS silvery white. | |
8089. |
Aim: To study the burning of magnesium ribbon in air. Caution : It is necessary that this activity should be performed in the presence of a teacher. For safety purpose, teacher and student should wear goggles. Activity: Take approximately 3-4 cm long magnesium ribbon and make it clean by rubbing it with sand paper. Hold it with a pair of tongs and heat on the flame of burner or spirit lamp and the ash being formed collects in the watch-glass as shown in the figure 1.1. Collected ash in the watch-glass isof magnesium oxide. Burn the magnesium ribbon. Keeping it away as far as possible from your eyes. Why is magnesium ribbon selected ? |
Answer» SOLUTION :MAGNESIUM ribbon is HIGHLY REACTIVE and burns EASILY in air. | |
8090. |
Aim : To study photochemical decomposition of silver chloride. Activity: Take about 2 g of silver chloride in a china dish. Put this china dish in sunlight for some time. State the uses of AgCl and AgBr. |
Answer» Solution :AGCL and AgBr are used in BLACK and white photography in FILMS. | |
8091. |
Aim : To study photochemical decomposition of silver chloride. Activity: Take about 2 g of silver chloride in a china dish. Put this china dish in sunlight for some time. What is the change in colour of silver chloride during its exposure to sunlight for sometime ? |
Answer» Solution :When SILVER chloride is exposed to SUNLIGHT for SOMETIME, its WHITE colour changes to grey. | |
8092. |
Aim : To study photochemical decomposition of silver chloride. Activity: Take about 2 g of silver chloride in a china dish. Put this china dish in sunlight for some time. What was the colour of silver chloride before exposure to sunlight? |
Answer» SOLUTION :Silver CHLORIDE was WHITE in colour before its exposure to sunlight. | |
8093. |
Aim: To study oxidation of copper to copper oxide. Activity: Take 1 g of copper powder in a china dish and heat it as shown in the figure. State the colour of copper oxide. |
Answer» SOLUTION :The COLOUR of COPPER OXIDE is BLACK. | |
8094. |
Aim: To study oxidation of copper to copper oxide. Activity: Take 1 g of copper powder in a china dish and heat it as shown in the figure. What type of reaction is represented by the reaction of formation of copper oxide from copper ? |
Answer» Solution :The REACTION of FORMATION of COPPER oxide from copper is an OXIDATION reaction. | |
8095. |
Aim: To study oxidation of copper to copper oxide. Activity: Take 1 g of copper powder in a china dish and heat it as shown in the figure. Name the reaction of forming copper from copper oxide. |
Answer» SOLUTION :The REACTION to form copper from copper OXIDE is a reduction reaction. | |
8096. |
Aim: To study oxidation of copper to copper oxide. Activity: Take 1 g of copper powder in a china dish and heat it as shown in the figure. Which product is obtained by passing hydrogen gas over hot copper oxide ? |
Answer» Solution :Copper is OBTAINED by passing HYDROGEN gas over hot copper OXIDE. `CuO(s) + H_(2)(g) OVERSET("Heat")TOCU(s) + H_(2)O(g)` |
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8097. |
Aim: To study electrolysis of water. Activity: Take a plastic mug. Drill two holes at the base of the mug. Fix two rubber corks in it, as shown in the figure 1.6. Arrange the test tubes in inverted position such that carbon electrodes remains in it as shown in the figure. Add water in a mug such that electrodes are immersed. Add a few drops of dilute sulphuric acid to water. Connect electrodes to a 6 volt battery. Now, switch on the current and leave the apparatus undisturbed for some time. Which gas is evolved at anode during electrolysis of water ? |
Answer» Solution :Oxygen GAS is evolved at ANODE during electrolysis of water. | |
8098. |
Aim: To study oxidation of copper to copper oxide. Activity: Take 1 g of copper powder in a china dish and heat it as shown in the figure. What happens on heating the copper powder ? |
Answer» Solution :Copper POWDER, on heating forms copper (II) OXIDE on its surface. | |
8099. |
Aim: To study electrolysis of water. Activity: Take a plastic mug. Drill two holes at the base of the mug. Fix two rubber corks in it, as shown in the figure 1.6. Arrange the test tubes in inverted position such that carbon electrodes remains in it as shown in the figure. Add water in a mug such that electrodes are immersed. Add a few drops of dilute sulphuric acid to water. Connect electrodes to a 6 volt battery. Now, switch on the current and leave the apparatus undisturbed for some time. What happens when O_(2)(g) and H_(2)(g) evolved are brought close to the burning candle ? |
Answer» Solution :`O_(2)(g)` does not burn, while `H_(2)(g)` BURNS with popping sound. | |
8100. |
Aim: To study electrolysis of water. Activity: Take a plastic mug. Drill two holes at the base of the mug. Fix two rubber corks in it, as shown in the figure 1.6. Arrange the test tubes in inverted position such that carbon electrodes remains in it as shown in the figure. Add water in a mug such that electrodes are immersed. Add a few drops of dilute sulphuric acid to water. Connect electrodes to a 6 volt battery. Now, switch on the current and leave the apparatus undisturbed for some time. What is an electrode ? |
Answer» Solution :Platinum or carbon ROD which REMAINS DIPPED in the solution of electrolyte and on the surface of which CHEMICAL reactions occur is known as an ELECTRODE. | |