8881 + Interview Questions in Chemistry in Class 10 Page 150 InterviewSolution

7451.	Assertion : An atom is electrically neutral. Reason : Atoms have equal number of protons and electrons.
Answer» BothassertionandReasonaretrueandReasonis correctexplanationof assertion bothassertionand Reasonis notthe correctexplanationof assertion Assertionis falsebutreasonis true Assertionis truebut REASON is FALSE Answer :A

Discussion

7452.	Assertion : All living organism are made of carbon atom. Carbon chemistry is also calledas living chemistry . Give reason . Reason : Carbon atom from the building blocks of living organism. These carbon atoms in combination with other atoms decide life on earth. Hence carbon chemistry is also calledas living chemistry.
Answer» Both Assertion and REASON are TRUEAND Reason is correct EXPLANATION of Assertion . Both Assertion and Reason are true but Reasonis not the correct explanation of Assertion . Assertion is true but Reasonis false . Assertion is falsebut Reason is true . ANSWER :A

Discussion

7453.	Assertion: Alkanes are saturated hydrocarbons. Reason: Hydrocarbons consist of covalent bonds.
Answer» A and R are correct, R explains the A. A is correct, R is WRONG. A is wrong, R is correct. A and R are correct, R doesn't explains A. SOLUTION :Alkanes are SATURATED HYDROCARBONS due to presence of single BONDS.

Discussion

7454.	Assertion : Al is very good reducing agent.Reason :It is usedin Aluminothermic process .
Answer» Both Assertionand Reason are ture and Reason is correct explanation of Assertion. Both Assertionand Reasonare TRUE but Reason is OT the correct explanation of Assertion. Assertion is true but Reason is false. Assertion is false but reason is true. ANSWER :B

Discussion

7455.	Assertion (A) White silver chloride turns grey in sunlight. Reason (R) : Copper reacts with zinc sulphate to form copper sulphate and zinc is deposited.
Answer» Both (A) and (R) are true and (R) is CORRECT EXPLANATION of the assertion. Both (A) and (R) are true but (R) is not the correct explanation of the assertion. (A) is true but (R) is FALSE. (A) is false but (R) is true. Solution :Assertion statement is true but REASON statement is false.

Discussion

7456.	Assertion (A): When pH of rain water is more than 7, it is called acid rain. Reason (R) : When electricity is passed through an aqueous solutions of sodium chloride, it decomposes to form H_2 and Cl_(2) gases.
Answer» Both (A) and (R) are TRUE and (R) is correct EXPLANATION of the ASSERTION. Both (A) and (R) are true but (R) is not the correct explanation of the assertion. (A) is true but (R) is false. (A) is false but (R) is true. Solution :Assertion is false but reason is true.

Discussion

7457.	Assertion (A) : When iron is dipped in conc HNO_(3) , it becomes chemically inert (or) passive. (R): Iron becomes passive when treated with nitric acid is due to the formation of a layer of iron oxide Fe_(3)O_(4) on its surface.
Answer» Both (A) and (R ) are CORRECT Both (A) and ( R) are not correct (A) is CORREC but(R ) is WRONG (A) is wrong but (R ) is correct SOLUTION :N/A

Discussion

7458.	Assertion (A) : When Blue vitriols are gently heated it turns colourless. Reason (R): It loses five water molecules and becomes anhydrous compounds.
Answer» Both (A) and (R) are CORRECT Both (A) and (R) are WRONG (A) is correct but (R) is wrong (A) is wrong but (R) is correct Answer :A

Discussion

7459.	Assertion (A) : Water, Ammonia (H_(2)O, NH_(3)) are hetero atomic molecules. Reason (R ) : Most of the elementary gases and compounds consist of atoms of the same element.
Answer» Both (A) and (R ) are CORRECT Both (A) and (R ) are WRONG (A) is correct but (R ) is wrong (A) is wrong but (R ) is correct Solution :(A) is correct but (R ) is wrong

Discussion

7460.	Assertion (A) : Water act as universal solvent. Reason (R) : Most of the substances are soluble in water.
Answer» Both (A) and (R) are CORRECT Both (A) and (R) are WRONG (A) is correct but (R) is wrong (A) is wrong but (R) is correct Answer :A

Discussion

7461.	Assertion (A): Washing soda is sodium carbonate hexahydrate. Reason : Chlorine gas is used for the preparation of bleaching powder.
Answer» Both (A) and (R) are true and (R) is CORRECT explanation of the assertion. Both (A) and (R) are true but (R) is not the correct explanation of the assertion. (A) is true but (R) is FALSE. (A) is false but (R) is true. Solution :WASHING soda is sodium carbonate DECAHYDRATE.

Discussion

7462.	Assertion (A): Tooth decay starts when the pH of the mouth is lower than 5.5. Reason (R) : Bee-sting leaves an acid which causes pain and irritation.
Answer» Both (A) and (R) are true and (R) is CORRECT explanation of the assertion. Both (A) and (R) are true but (R) is not the correct explanation of the assertion. (A) is true but (R) is FALSE. (A) is false but (R) is true. Solution :Both assertion and REASON statements are true but reason is not the explanation of assertion.

Discussion

7463.	Assertion (A): Though the central atom of both NH_(3) and H_(2)O molecules are sp_(3) hybridised, yet H – N – H bond angle is greater than that of H – O – H. Reason (R): This is because nitrogen atom has one lone pair and oxygen atom has two lone pairs.
Answer»

Discussion

7464.	Assertion (A) : There is a double bond in the molecule of nitrogen. Reason (R) :Carbon shares its valance electrons with other atoms of carbon or with atoms of other elements.
Answer» Both (A) and (R) are true and (R) is CORRECT explanation of the assertion. Both (A) and (R) are true but (R) is not the correct explanation of the assertion. (A) is true but (R) is FALSE. (A) is false but (R) is true. SOLUTION :Assertion is false but REASON is true.

Discussion

7465.	Assertion (A): The strength of acids and bases depends on the number of H^+ ions and OH^- ions produced. Reason (R) : The process of dissolving an acid or base in water is highly endothermic.
Answer» Both (A) and (R) are TRUE and (R) is CORRECT explanation of the ASSERTION. Both (A) and (R) are true but (R) is not the correct explanation of the assertion. (A) is true but (R) is false. (A) is false but (R) is true. Solution :The REASON STATEMENT is false.

Discussion

7466.	Assertion A: The position of hydrogen in modern periodic table is a matter of controversy. Reason R: The properties of hydrogen resembles with the properties of alkali metals and halogens.
Answer» Assertion A and REASON R are true, and reason R is the CORRECT EXPLANATION of assertion A. Assertion A and reason R are true, but reason R is not the correct explanation of assertion A. Assertion A is CORRET but reason R is FALSE. Assertion A is false but reason R is true. Answer :A

Discussion

7467.	Assertion (A) : The nature of bond in Nal molecule is covalent. Reaction (R ) : The electronegativity difference between Na and I is 1.5
Answer» Both (A) and (R ) are CORRECT Both (A) and ( R) are not correct (A) is CORREC but(R ) is WRONG (A) is wrong but (R ) is correct SOLUTION :N/A

Discussion

7468.	Assertion (A): The important products from chloro-alkali process are hydrogen, chlorine and sodium hydroxide. Reason (R) : Baking powder is a mixture of baking soda and citric acid.
Answer» Both (A) and (R) are TRUE and (R) is correct EXPLANATION of the ASSERTION. Both (A) and (R) are true but (R) is not the correct explanation of the assertion. (A) is true but (R) is false. (A) is false but (R) is true. Solution :Both the statements are correct.

Discussion

7469.	Assertion (A) : The atomicity of ozone is three. Reason (R ) : 1 moleculles of ozone contains 3 atoms of oxygen.
Answer» Both (A) and (R ) are CORRECT Both (A) and (R ) are WRONG (A) is correct but (R ) is wrong (A) is wrong but (R ) is correct Solution :Both (A) and (R ) are correct

Discussion

7470.	Assertion (A) : Sugar in water is a true solution. Reason (R): True solution is a homogeneous mixture that contains small solute particles that are dissolved throughout the solvent.
Answer» Both (A) and (R) are CORRECT Both (A) and (R) are WRONG (A) is correct but (R) is wrong (A) is wrong but (R) is correct Answer :B

Discussion

7471.	Assertion : A solution of table salt in a glass of water is homogeneous Reason: A solution having same composition throughout is heterogeneous
Answer» If both Assertion & Reason are true and the reason is the correctexplanation of the assertion. If both Assertion & Reason are true but the reason is not the correctexplanation of the assertion. If Assertion is true statement but Reason is false. If both Assertion and Reason are false statements. ANSWER :C

Discussion

7472.	Assertion (A): Solution of sulphur in CS_2is an example for non-aqueous solution.Reason (R) : The solution in which any liquid other than water acts as a solvent is called non-aqueous solution.
Answer» Both (A) and (R) are CORRECT Both (A) and (R) are WRONG (A) is correct but (R) is wrong (A) is wrong but (R) is correct Answer :A

Discussion

7473.	Assertion (A) : Solubility of KNO_3increases with increase in temperature. Reason (R) : Solubility of KNO_4 is an endothermic process.
Answer» Both (A) and (R) are CORRECT Both (A) and (R) are WRONG (A) is correct but (R) is wrong (A) is wrong but (R) is correct Answer :B

Discussion

7474.	Assertion (A) : Slaking of lime is an exothermic and combination reaction. Reason (R ) : Quick lime reacts with water to produce slaked lime.
Answer» Both (A) and (R) are true and (R) is correct explanation of the assertion. Both (A) and (R) are true but (R) is not the correct explanation of the assertion. (A) is true but (R) is false. (A) is false but (R) is true. SOLUTION :This REACTION is both a COMBINATION reaction and EXOTHERMIC reaction .

Discussion

7475.	Assertion (A): SF_(6) molecule is unstable. Reason (R): A stable molecule must have 8 electrons around the central atom. i.e. octet rule should be satisfied.
Answer» If both Assertion & Reason are TRUE and the reason is the correct explanationof the assertion. If both Assertion & Reason are true but the reason is not the correctexplanation of the assertion. If Assertion is true STATEMENT but Reason is false. If both Assertion and Reason are false STATEMENTS. ANSWER :D

Discussion

7476.	Assertion (A) : Salt solution-common salt dissolved in water is an example for binary solution. Reason (R) : A solution with two components is called a binary solution.
Answer» Both (A) and (R) are CORRECT Both (A) and (R) are WRONG (A) is correct but (R) is wrong (A) is wrong but (R) is correct Answer :A

Discussion

7477.	Assertion (A): Salt of a strong acid and strong base have a pH less than 7. Reason (R) : Seawater contains many salts dissolved in it.
Answer» Both (A) and (R) are TRUE and (R) is correct EXPLANATION of the assertion. Both (A) and (R) are true but (R) is not the correct explanation of the assertion. (A) is true but (R) is FALSE. (A) is false but (R) is true. Solution :Salts of strong acid and strong BASE have pH equal to 7.

Discussion

7478.	Assertion (A) : Precipitation reactions produce soluble salts. Reason (R) : In the reaction : Lead oxide + Carbon to Lead + Carbon dioxide, carbon is getting oxidised.
Answer» Both (A) and (R) are TRUE and (R) is CORRECT explanation of the ASSERTION. Both (A) and (R) are true but (R) is not the correct explanation of the assertion. (A) is true but (R) is false. (A) is false but (R) is true. Solution :The assertion is false but reason is true.

Discussion

7479.	Assertion (A): Potassium chloride is insoluble in kerosene. Reason (R) : Ionic compounds are insoluble in organic solvents.
Answer» Both (A) and (R) are true and (R) is correct EXPLANATION of the ASSERTION Both (A) and (R) are true but (R) is not the correct explanation of the assertion. (A) is true but (R) is FALSE. (A) is false but (R) is true. Solution :Both assertion and reason are correct and the reason is the correct explanation of assertion.

Discussion

7480.	Assertion (A): Plaster of Paris is used in toys, material for decoration and for making surfaces smooth. Reason (R) : Bleaching powder is used for making drinking water free from germs.
Answer» Both (A) and (R) are TRUE and (R) is CORRECT explanation of the ASSERTION. Both (A) and (R) are true but (R) is not the correct explanation of the assertion. (A) is true but (R) is false. (A) is false but (R) is true. Solution :Both the statements are correct.

Discussion

7481.	Assertion (A): Pi bond is never formed alone. It is formed along with a sigma bond Reason (R): Pi bond is formed by sideway overlap of p- orbitals only.
Answer»

Discussion

7482.	Assertion (A) : Passage of 48,250C of electricity through cupric sulphate and ferrous sulphate solutions results in the deposition 0.5 moles each of iron and copper at the respective cathodes. Reason (R): Number of equivalents of a metal deposited at cathode is equal to the number of faradays of electricity passed through the electrolyte.
Answer» Both A and R are true and R is the correct EXPLANATION of A Both A and R are true and R is not the correct explanation of A A is correct and R is wrong A is wrong and R is correct Solution :48,250 C is equal to 0.5 Faraday. Number of equal alents of METAL deposited is equal to the number of faradays of ELECTRICITY passed through the electrolyte and that means 0.5 equilvalents of copper and iron are deposited. Since they are bivalent IONS, 0.5 equialents correspond to 0.25 MOLES

Discussion

7483.	Assertion (A) : On passing steam over hot iron, oxygen gas is produced. Reason (R) : A molecule of zinc sulphate contains four atoms of oxygen.
Answer» Both (A) and (R) are true and (R) is CORRECT explanation of the assertion. Both (A) and (R) are true but (R) is not the correct explanation of the assertion. (A) is true but (R) is false. (A) is false but (R) is true. SOLUTION :It is HYDROGEN that is PRODUCED and not oxygen.

Discussion

7484.	Assertion (A) : Nobel gasare unreactive. Reaction (R ) : The have unstable electronic configuration in their valence shells.
Answer» Both (A) and (R ) are CORRECT Both (A) and ( R) are not correct (A) is CORREC but(R ) is WRONG (A) is wrong but (R ) is correct SOLUTION :N/A

Discussion

7485.	Assertion (A) : Nitrogen, oxygen and hydrogen are diatomic molecules. Reason (R ) : N_(2),O_(2),H_(2) contain two atoms in one molecule and so they are diatomic molecule.
Answer» Both (A) and (R ) are CORRECT Both (A) and (R ) are WRONG (A) is correct but (R ) is wrong (A) is wrong but (R ) is correct Solution :Both (A) and (R ) are correct

Discussion

7486.	Assertion (A) : Nickel steel is used in making cables, aircraft parts and propeller. Reason (R ) : Nickel steel alloy is hard, brittle and polishable.
Answer» Both (A) and (R ) are CORRECT Both (A) and ( R) are not correct (A) is CORREC but(R ) is WRONG (A) is wrong but (R ) is correct SOLUTION :N/A

Discussion

7487.	Assertion (A) : NH_(3),H_(2)O, HCl are heteroatomic molecules. Reason (R ) : The molecule that consists atoms of different elements is called heteroatomic molecules.
Answer» (A) are (R ) are CORRECT.(R ) EXPLAIN (A) (A) is correct (R ) is WRONG (A) is wrong (R ) is correct (A) and (R ) are correct. (R ) does not explain (A) SOLUTION :(A) are (R ) are correct.(R ) explain (A)

Discussion

7488.	Assertion A : Newlands arranged the then known elements in order of musical notes. Reason R: According to Newlands, proton is responsible for the arrangement of elements in the periodic table.
Answer» Assertion A and reason R are TRUE, and reason R is the CORRECT EXPLANATION of assertion A. Assertion A and reason R are true, but reason R is not the correct explanation of assertion A. Assertion A is corret but reason R is FALSE. Assertion A is false but reason R is true. Answer :C

Discussion

7489.	Assertion (A): Methane is formed when four electrons of carbon are shared with four hydrogen atoms. Reason (R ): This characteristic of carbon atom by virtue of which it forms four covalent bonds is referred to as tetra valency of carbon.
Answer» (A) is correct and (R ) EXPLAINS (A) Both (A) and (R ) are wrong (A) is correct but (R ) does not explain (A) (A) is wrong but (R ) is correct Answer :A

Discussion

7490.	Assertion (A) : metals like Titanium, chromium, Manganese and Zirconium are called strategic metals. Reason (R ) : They find their applications in the manufacturing of defence equipments.
Answer» Both (A) and (R ) are CORRECT Both (A) and ( R) are not correct (A) is CORREC but(R ) is WRONG (A) is wrong but (R ) is correct SOLUTION :N/A

Discussion

7491.	Assertion (A): Metals above hydrogen in activity series can displace hydrogen from diluteacids.Reason (R) : Metals occur in nature only in the form of their compounds.
Answer» Both (A) and (R) are true and (R) is correct EXPLANATION of the ASSERTION Both (A) and (R) are true but (R) is not the correct explanation of the assertion. (A) is true but (R) is FALSE. (A) is false but (R) is true. Solution :Assertion is correct but REASON is wrong.

Discussion

7492.	Assertion (A) : Magnesium is used in sacrificial protection method to prevent corrosion. Reason (R ) : Magnesium is more reactive than iron. When it is coated on the articles made of steel, it sacrifices itself to protect steel.
Answer» Both (A) and (R ) are CORRECT Both (A) and ( R) are not correct (A) is CORREC but(R ) is WRONG (A) is wrong but (R ) is correct SOLUTION :N/A

Discussion

7493.	Assertion (A): Lead is more reactive than aluminium in the reactivity series.Reason (R) : Aqua regia is a mixture of conc. HCl and conc. HNO_3mixed together in the ratioof 1:3
Answer» Both (A) and (R) are true and (R) is CORRECT explanation of the ASSERTION Both (A) and (R) are true but (R) is not the correct explanation of the assertion. (A) is true but (R) is false. (A) is false but (R) is true. Solution :Assertion is correct but the REASON is wrong.

Discussion

7494.	Assertion (A) : Iron articles get coated with reddish brown powder when left for sometime in the open. Reason (R ) : Iron is attacked by substances around it such as moisture, acids, etc.
Answer» Both (A) and (R) are TRUE and (R) is correct EXPLANATION of the ASSERTION. Both (A) and (R) are true but (R) is not the correct explanation of the assertion. (A) is true but (R) is FALSE. (A) is false but (R) is true. Solution :Reason gives the explanation of assertion.

Discussion

7495.	Assertion Ionic compounds tend to be non-volatile Reasoning Intermolecular forces in these compounds are weak .
Answer»

Discussion

7496.	Assertion A: In the modern periodic table, metallic character of elements increases on moving down the group. Reason R: In the modern periodic table, the elements are arranged in order of their increasing atomic masses.
Answer» Assertion A and REASON R are TRUE, and reason R is the correct EXPLANATION of assertion A. Assertion A and reason R are true, but reason R is not the correct explanation of assertion A. Assertion A is corret but reason R is FALSE. Assertion A is false but reason R is true. Answer :C

Discussion

7497.	Assertion (A): In alumino thermic process, Iron oxide is reduced to iron by igniting with Aluminium powder. Reason (R): Aluminium is a powerful reducing agent.
Answer» Both (A) and (R ) are CORRECT Both (A) and ( R) are not correct (A) is CORREC but(R ) is WRONG (A) is wrong but (R ) is correct SOLUTION :N/A

Discussion

7498.	Assertion (A) : If both Delta H^(0) and Delta S^(0) are positive than the reaction will be spontaneous at high temperature. Reason (R ): All processes with positive entropy change are spontaneous.
Answer» A and R both are correct, and R is correct EXPLANATION of A A and R both are correct,but R is not the correct explanation of A A is true but R is FALSE A and R both are false.

Discussion

7499.	Assertion (A) : Hydrogen, Oxygen and Ozone are called homoatomic molecules. Reason (R ) : Homoatomic molecules are made up of atoms of the same element.
Answer» Both (A) and (R ) are CORRECT Both (A) and (R ) are WRONG (A) is correct but (R ) is wrong (A) is wrong but (R ) is correct Solution :(A) is wrong but (R ) is correct

Discussion

7500.	Assertion (A): Hydrochloric acid helps in the digestion of food in the stomach. Reason (R) : The strength of a acid depends upon the number of H^+ ions.
Answer» Both (A) and (R) are TRUE and (R) is correct explanation of the ASSERTION. Both (A) and (R) are true but (R) is not the correct explanation of the assertion. (A) is true but (R) is FALSE. (A) is false but (R) is true. Solution :Both statements are correct.

Discussion

Explore topic-wise InterviewSolutions in .

Assertion : An atom is electrically neutral. Reason : Atoms have equal number of protons and electrons.

Assertion: Alkanes are saturated hydrocarbons. Reason: Hydrocarbons consist of covalent bonds.

Assertion : Al is very good reducing agent.Reason :It is usedin Aluminothermic process .

Assertion (A) White silver chloride turns grey in sunlight. Reason (R) : Copper reacts with zinc sulphate to form copper sulphate and zinc is deposited.

Assertion (A): When pH of rain water is more than 7, it is called acid rain. Reason (R) : When electricity is passed through an aqueous solutions of sodium chloride, it decomposes to form H_2 and Cl_(2) gases.

Assertion (A) : When iron is dipped in conc HNO_(3) , it becomes chemically inert (or) passive. (R): Iron becomes passive when treated with nitric acid is due to the formation of a layer of iron oxide Fe_(3)O_(4) on its surface.

Assertion (A) : When Blue vitriols are gently heated it turns colourless. Reason (R): It loses five water molecules and becomes anhydrous compounds.

Assertion (A) : Water, Ammonia (H_(2)O, NH_(3)) are hetero atomic molecules. Reason (R ) : Most of the elementary gases and compounds consist of atoms of the same element.

Assertion (A) : Water act as universal solvent. Reason (R) : Most of the substances are soluble in water.

Assertion (A): Washing soda is sodium carbonate hexahydrate. Reason : Chlorine gas is used for the preparation of bleaching powder.

Assertion (A): Tooth decay starts when the pH of the mouth is lower than 5.5. Reason (R) : Bee-sting leaves an acid which causes pain and irritation.

Assertion (A): Though the central atom of both NH_(3) and H_(2)O molecules are sp_(3) hybridised, yet H – N – H bond angle is greater than that of H – O – H. Reason (R): This is because nitrogen atom has one lone pair and oxygen atom has two lone pairs.

Assertion (A) : There is a double bond in the molecule of nitrogen. Reason (R) :Carbon shares its valance electrons with other atoms of carbon or with atoms of other elements.

Assertion (A): The strength of acids and bases depends on the number of H^+ ions and OH^- ions produced. Reason (R) : The process of dissolving an acid or base in water is highly endothermic.

Assertion A: The position of hydrogen in modern periodic table is a matter of controversy. Reason R: The properties of hydrogen resembles with the properties of alkali metals and halogens.

Assertion (A) : The nature of bond in Nal molecule is covalent. Reaction (R ) : The electronegativity difference between Na and I is 1.5

Assertion (A): The important products from chloro-alkali process are hydrogen, chlorine and sodium hydroxide. Reason (R) : Baking powder is a mixture of baking soda and citric acid.

Assertion (A) : The atomicity of ozone is three. Reason (R ) : 1 moleculles of ozone contains 3 atoms of oxygen.

Assertion (A) : Sugar in water is a true solution. Reason (R): True solution is a homogeneous mixture that contains small solute particles that are dissolved throughout the solvent.

Assertion : A solution of table salt in a glass of water is homogeneous Reason: A solution having same composition throughout is heterogeneous

Assertion (A): Solution of sulphur in CS_2is an example for non-aqueous solution.Reason (R) : The solution in which any liquid other than water acts as a solvent is called non-aqueous solution.

Assertion (A) : Solubility of KNO_3increases with increase in temperature. Reason (R) : Solubility of KNO_4 is an endothermic process.

Assertion (A) : Slaking of lime is an exothermic and combination reaction. Reason (R ) : Quick lime reacts with water to produce slaked lime.

Assertion (A): SF_(6) molecule is unstable. Reason (R): A stable molecule must have 8 electrons around the central atom. i.e. octet rule should be satisfied.

Assertion (A) : Salt solution-common salt dissolved in water is an example for binary solution. Reason (R) : A solution with two components is called a binary solution.

Assertion (A): Salt of a strong acid and strong base have a pH less than 7. Reason (R) : Seawater contains many salts dissolved in it.

Assertion (A) : Precipitation reactions produce soluble salts. Reason (R) : In the reaction : Lead oxide + Carbon to Lead + Carbon dioxide, carbon is getting oxidised.

Assertion (A): Potassium chloride is insoluble in kerosene. Reason (R) : Ionic compounds are insoluble in organic solvents.

Assertion (A): Plaster of Paris is used in toys, material for decoration and for making surfaces smooth. Reason (R) : Bleaching powder is used for making drinking water free from germs.

Assertion (A): Pi bond is never formed alone. It is formed along with a sigma bond Reason (R): Pi bond is formed by sideway overlap of p- orbitals only.

Assertion (A) : On passing steam over hot iron, oxygen gas is produced. Reason (R) : A molecule of zinc sulphate contains four atoms of oxygen.

Assertion (A) : Nobel gasare unreactive. Reaction (R ) : The have unstable electronic configuration in their valence shells.

Assertion (A) : Nitrogen, oxygen and hydrogen are diatomic molecules. Reason (R ) : N_(2),O_(2),H_(2) contain two atoms in one molecule and so they are diatomic molecule.

Assertion (A) : Nickel steel is used in making cables, aircraft parts and propeller. Reason (R ) : Nickel steel alloy is hard, brittle and polishable.

Assertion (A) : NH_(3),H_(2)O, HCl are heteroatomic molecules. Reason (R ) : The molecule that consists atoms of different elements is called heteroatomic molecules.

Assertion A : Newlands arranged the then known elements in order of musical notes. Reason R: According to Newlands, proton is responsible for the arrangement of elements in the periodic table.

Assertion (A): Methane is formed when four electrons of carbon are shared with four hydrogen atoms. Reason (R ): This characteristic of carbon atom by virtue of which it forms four covalent bonds is referred to as tetra valency of carbon.

Assertion (A) : metals like Titanium, chromium, Manganese and Zirconium are called strategic metals. Reason (R ) : They find their applications in the manufacturing of defence equipments.

Assertion (A): Metals above hydrogen in activity series can displace hydrogen from diluteacids.Reason (R) : Metals occur in nature only in the form of their compounds.

Assertion (A) : Magnesium is used in sacrificial protection method to prevent corrosion. Reason (R ) : Magnesium is more reactive than iron. When it is coated on the articles made of steel, it sacrifices itself to protect steel.

Assertion (A): Lead is more reactive than aluminium in the reactivity series.Reason (R) : Aqua regia is a mixture of conc. HCl and conc. HNO_3mixed together in the ratioof 1:3

Assertion (A) : Iron articles get coated with reddish brown powder when left for sometime in the open. Reason (R ) : Iron is attacked by substances around it such as moisture, acids, etc.

Assertion Ionic compounds tend to be non-volatile Reasoning Intermolecular forces in these compounds are weak .

Assertion A: In the modern periodic table, metallic character of elements increases on moving down the group. Reason R: In the modern periodic table, the elements are arranged in order of their increasing atomic masses.

Assertion (A): In alumino thermic process, Iron oxide is reduced to iron by igniting with Aluminium powder. Reason (R): Aluminium is a powerful reducing agent.

Assertion (A) : If both Delta H^(0) and Delta S^(0) are positive than the reaction will be spontaneous at high temperature. Reason (R ): All processes with positive entropy change are spontaneous.

Assertion (A) : Hydrogen, Oxygen and Ozone are called homoatomic molecules. Reason (R ) : Homoatomic molecules are made up of atoms of the same element.

Assertion (A): Hydrochloric acid helps in the digestion of food in the stomach. Reason (R) : The strength of a acid depends upon the number of H^+ ions.