8881 + Interview Questions in Chemistry in Class 10 Page 160 InterviewSolution

7951.	Among the following pairs , pick out the smallest . (i) Mg, Ca (ii) Al, Si(iii) Cl, Br .
Answer» Solution :(i) MG (II) Si (III) Cl

Discussion

7952.	Among the following molecules, p-p overlap takes place in
Answer» `H_(2)` `BeCl_(2)` `F_(2)` `HF` SOLUTION :Electronic configuration of FLUORINE is `1s^(2)2s^(2)2p^(5)` and has a half-filled p-orbital for OVERLAPPING.

Discussion

7953.	Among the following molecules H-bond is present in
Answer» <P>`NH_(3)` `PH_(3)` `H_(2)S` `CH_(4)` Solution :Since the electronegativity of N is greater than P, S and C, H-bond is present in `NH_(3)` GAS.

Discussion

7954.	Among the elements given below the element with highest electronegativity is
Answer» a)lithium b)CARBON C)BORON d)FLUORINE SOLUTION :carbon

Discussion

7955.	Among H_(3)PO_(2), H_(3)PO_(3) and H_(3)PO_(4) which has the maximum acidic strength ? Explain
Answer» Solution :Generally, the acidic strength of oxyacids of an element with DIFFERENT oxidation states increases with the increase in oxidation state of central ATOM. So, the expected order of acidic strength should be `H_(3)PO_(4) gt H_(3)PO_(3) gt H_(3)PO_(2)`. But actual order is `H_(3)PO_(2) gt H_(3)PO_(3) gt H_(3)PO_(4)`. This can be explained BASED on the number of `OH^(-)` groups attached to central P-atom. With increasing number of OH groups on central P-atom the acidic strength decreases. Hence, `H_(3)PO_(4)` is having minimum acidic strength and `H_(3)PO_(2)` is having maximum acidic strength. `underset(H_(3)PO)(H - underset(underset(H)(\|))OVERSET(overset(O)(\|\|))(P) - OH) "" underset(H_(3)PO)(H - underset(underset(OH)(\|))overset(overset(O)(\|\|))(P) - OH) "" underset(H_(3)PO)(HO - underset(underset(OH)(\|))overset(overset(O)(\|\|))(P) - OH)` With the increases in number of `-OH` groups, the strength of conjugate base FORMED increases due to greater proton accepting tendency. Therefore, the strengths of corresponding acids decrease accordingly

Discussion

7956.	Among alkali metal halides LiI has highest covalent character.
Answer» ANSWER :TRUE

Discussion

7957.	Among alkali metal ions ………..ion has highest polarizing power.
Answer» SOLUTION :`LI^(+)`

Discussion

7958.	Among 'A' and 'C' which element has larger atomic radius? Why?
Answer» Solution :Element A and C belong to the same period. Soaccording to the PERIODIC trends in the modem periodic table, the ATOMIC radius GOES on decreasing while going from left to RIGHT within a period. Therefore atomic size of element .A. is larger than atomic size of element .B..

Discussion

7959.	Among 4p,4s,3p and 3d orbital has the least energy
Answer» ANSWER :FALSE

Discussion

7960.	Ammoniumhydroxidereactswith________itformsammoniumnitrateand water .
Answer» SOLUTION :NITRIC ACID

Discussion

7961.	Ammonium chloride is a salt of
Answer» WEAK ACID and a weak base weak acid and a STRONG base strong acid and a strong base strong acid and a weak base Answer :D

Discussion

7962.	Ammonia is dried over
Answer» SLAKED lime conc. `H_(2)SO_(4)` QUICK lime `BaCl_(2)` Solution :Ammonia REACTS with all EXCEPT quick lime.

Discussion

7963.	Ammoina and hydrogen chloride react to from ammoninum hydroxide.
Answer» ANSWER :F

Discussion

7964.	Amino acid is formed by decomposition of which component of our diet
Answer» Carbohydrate Starch Protein Fat Answer :C

Discussion

7965.	Amedeo Avogadro put forward a hypothesis based on the relation between the number of ………………. And the …………….. Of gases.
Answer» SOLUTION :MOLECULES, VOLUME

Discussion

7966.	Amalgam is an alloy of :
Answer» COPPER and zinc Metal and mercury Sodium and potassium Iron and Carbon Answer :B

Discussion

7967.	Aluminum is extracted from
Answer» HEMATITE bauxite CALAMINE magnetite Answer :B

Discussion

7968.	Aluminium reacts with strong causitc alkalis forming aluminates .
Answer» SOLUTION :N/A

Discussion

7969.	Aluminium reacts with NaOH to give ………….
Answer» `Al_(2)O_(3)` `AlCl_(3)` `NaAlO_(2)` `AL(OH)_(3)` ANSWER :C

Discussion

7970.	Aluminiumreactswith caustic alkalis to form ____________.
Answer» SOLUTION :ALUMINATES

Discussion

7971.	Aluminium powder is used in thermite welding because
Answer» SOLUTION :It is a STRONG REDUCING AGENT

Discussion

7972.	Aluminium occurs in the combined state. Reason (R) : It is a reactive metal and so it occurs in combined state.
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

7973.	Aluminium liberates hydrogen gas on reaction with
Answer» concentrated SULPHURIC acid nitric acid hydrochloric acid none of these Solution :`2Al+6HCl_((idl))to2AlCl_(3)+3H_(2)UARR`

Discussion

7974.	Aluminium is very good oxidising agent
Answer» SOLUTION :CORRECT STATEMENT : Aluminium is very GOOD REDUCING agnet .

Discussion

7975.	Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same ?(i) Good thermal conductivity(ii) Good electrical conductivity(iii) Ductility(iv) High melting point
Answer» (i) and (ii) (i) and (iii) (ii) and (iii) (i) and (IV) Solution :The PROPERTIES that are expected from a METAL for use as cooking utensils are good thermal conductivity and HIGH melting POINT.

Discussion

7976.	Aluminium is used for making cooking utensils. Which of the following properties of aluminium responsible for the same i) Good thermal conductivity ii) Good electrical conductivity iii) Ductility iv) High melting point
Answer» A) (i) and(ii) B) (i) and (iii) C) (ii) and (iii) D) (i) and (IV) Answer :4

Discussion

7977.	Aluminium is used in the alumino-thermic process because
Answer» it is a LIGHT metal it has more AFFINITY for OXYGEN it is a REDUCING agent it is a REACTIVE metal Answer :B

Discussion

7978.	Aluminium is the metal found most abundantly in the earth 's crust.
Answer» SOLUTION :N/A

Discussion

7979.	Aluminium is produced by the electrolyticreduction of fused _______ in the electrolytic cell.
Answer» SOLUTION :ALUMINA

Discussion

7980.	Aluminium is not attacked by water because of the presence of ______ on its surface.
Answer» SOLUTION :`Al_(2)O_(3)`

Discussion

7981.	Aluminium is extracted from bauxite by the electrolysis of aluminium oxide dissolved in cryolite. Now answer the following question: Write the reactions at cathode in the electrolytic reduction of alumina.
Answer» Solution :(i) `Al^(3+) + 3e^(-) to Al ""….` REDUCTION at CATHODE (II) `2O^(2-) to O_2 + 4e^(-) ""….` oxidation at ANODE

Discussion

7982.	Aluminium is extracted from bauxite by the electrolysis of aluminium oxide dissolved in cryolite. Now answer the following question: Why is so much graphite required for this electrolytic process?
Answer» SOLUTION :Because GRAPHITE burns as 2C + `O_2 to 2CO`during electrolysis.

Discussion

7983.	Aluminium is extracted from bauxite by the electrolysis of aluminium oxide dissolved in cryolite. Now answer the following question: Write down the word which correctly completes the following sentence: "By dissolving aluminium oxide in cryolite a __________ solution is produced. (nonconducting/conducting)"
Answer» SOLUTION :CONDUCTING

Discussion

7984.	Aluminium is extracted from bauxite by the electrolysis of aluminium oxide dissolved in cryolite. Now answer the following question: Write the formula of cryolite.
Answer» SOLUTION :`Na_3 AL F_6 `

Discussion

7985.	Aluminium is extracted from bauxite by the electrolysis of aluminium oxide dissolved in cryolite. Now answer the following question: Write the equation for the action of heat on aluminium hydroxide.
Answer» SOLUTION :`2AL (OH)_3 to Al_2 O_3 + 3H_2 O`

Discussion

7986.	Aluminium is extracted from bauxite by the electrolysis of aluminium oxide dissolved in cryolite. Now answer the following question: When bauxite is treated with sodium hydroxide solution, what happens to the aluminium oxide and iron (III) oxide?
Answer» SOLUTION :ALUMINIUM oxide DISSOLVES in SODIUM hydroxide and iron oxide does not dissolve.

Discussion

7987.	Aluminium is extracted from bauxite by the electrolysis of aluminium oxide dissolved in cryolite. Now answer the following question: Name the process used for the purification of bauxite.
Answer» SOLUTION :Bayer.s PROCESS

Discussion

7988.	Aluminium is a powerful reducing agent
Answer» SOLUTION :N/A

Discussion

7989.	Aluminium is added in Bessmer process to remove certain impurities, but not in L-D process. This is because
Answer» pure oxygen is PASSED in Bessemer process pure oxygen is passed in L-D process air is passed in L-D process of ADDITION of SPIEGEL in Bessemer process Answer :B

Discussion

7990.	Aluminium is a reddish brown metal and it is a bad conductor of heat and electricity
Answer» SOLUTION :Aluminium is a SILVERY white METAL and it is a good conductor of heat and ELECTRICITY.

Discussion

7991.	Aluminium does not react with sodium hydroxide.
Answer» ANSWER :F

Discussion

7992.	Aluminium : Bauxite :: Copper : ___________
Answer» SOLUTION :COPPER PYRITE .

Discussion

7993.	Aluminium, Argon , Xenon, Sodium
Answer» Solution :Sodium : It BELONGS to s - block, WHEREAS OTHERS BELONG to p- block.

Discussion

7994.	Aluminium and zinc do not corrode easily even though they arereactive metals. Give reasons for your answer.
Answer» Solution :Aluminium and zinc REACT with MOIST AIR to form a thin protective layer of oxide on their surfaces. This layer prevents further CORROSION of the metals.

Discussion

7995.	Aluminium :660^(@)C :: Copper : ____________
Answer» SOLUTION :`1085^(@)C`

Discussion

7996.	Alumina is mixed with cryolite and subjected to electrolysis to extract aluminium. Write the equation of the reduction reaction taking place at negative electrode.
Answer» ANSWER :`AL^(3+)+3E to Al`

Discussion

7997.	Alumina is mixed with cryolite and subjected to electrolysis to extract aluminium. Why cryolite is added to alumina?
Answer» ANSWER :To lower the melting point of aluminia and to INCREASE the electrical CONDUCTIVITY.

Discussion

7998.	Alumina is mixed with cryolite and subjected to electrolysis to extract aluminium. Which are the ions present in alumina?
Answer» ANSWER :`AL^(3+)`, `O^(2-)`

Discussion

7999.	'Alum' is an example of
Answer» single salt double salt acids none of above Solution :ALUM is `M_2 SO_4 * M._2 (SO_4)_3 24 H_2 O` where M= UNIVALENT CATION and M. = trivalent cations Potash alum is a double salt. `K_2 SO_4 * Al_2 (SO_4)_3 * 24 H_2 O`

Discussion

8000.	Aluiminium alloyed with gold and silver for making coins and iewels.
Answer» SOLUTION :COPPER alloyed with GOLD and silver for makng coin and jewels.

Discussion

Explore topic-wise InterviewSolutions in .

Among the following pairs , pick out the smallest . (i) Mg, Ca (ii) Al, Si(iii) Cl, Br .

Among the following molecules, p-p overlap takes place in

Among the following molecules H-bond is present in

Among the elements given below the element with highest electronegativity is

Among H_(3)PO_(2), H_(3)PO_(3) and H_(3)PO_(4) which has the maximum acidic strength ? Explain

Among alkali metal halides LiI has highest covalent character.

Among alkali metal ions ………..ion has highest polarizing power.

Among 'A' and 'C' which element has larger atomic radius? Why?

Among 4p,4s,3p and 3d orbital has the least energy

Ammoniumhydroxidereactswith________itformsammoniumnitrateand water .

Ammonium chloride is a salt of

Ammonia is dried over

Ammoina and hydrogen chloride react to from ammoninum hydroxide.

Amino acid is formed by decomposition of which component of our diet

Amedeo Avogadro put forward a hypothesis based on the relation between the number of ………………. And the …………….. Of gases.

Amalgam is an alloy of :

Aluminum is extracted from

Aluminium reacts with strong causitc alkalis forming aluminates .

Aluminium reacts with NaOH to give ………….

Aluminiumreactswith caustic alkalis to form ____________.

Aluminium powder is used in thermite welding because

Aluminium occurs in the combined state. Reason (R) : It is a reactive metal and so it occurs in combined state.

Aluminium liberates hydrogen gas on reaction with

Aluminium is very good oxidising agent

Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same ?(i) Good thermal conductivity(ii) Good electrical conductivity(iii) Ductility(iv) High melting point

Aluminium is used for making cooking utensils. Which of the following properties of aluminium responsible for the same i) Good thermal conductivity ii) Good electrical conductivity iii) Ductility iv) High melting point

Aluminium is used in the alumino-thermic process because

Aluminium is the metal found most abundantly in the earth 's crust.

Aluminium is produced by the electrolyticreduction of fused _______ in the electrolytic cell.

Aluminium is not attacked by water because of the presence of ______ on its surface.

Aluminium is extracted from bauxite by the electrolysis of aluminium oxide dissolved in cryolite. Now answer the following question: Write the reactions at cathode in the electrolytic reduction of alumina.

Aluminium is extracted from bauxite by the electrolysis of aluminium oxide dissolved in cryolite. Now answer the following question: Why is so much graphite required for this electrolytic process?

Aluminium is extracted from bauxite by the electrolysis of aluminium oxide dissolved in cryolite. Now answer the following question: Write the formula of cryolite.

Aluminium is extracted from bauxite by the electrolysis of aluminium oxide dissolved in cryolite. Now answer the following question: Write the equation for the action of heat on aluminium hydroxide.

Aluminium is extracted from bauxite by the electrolysis of aluminium oxide dissolved in cryolite. Now answer the following question: When bauxite is treated with sodium hydroxide solution, what happens to the aluminium oxide and iron (III) oxide?

Aluminium is extracted from bauxite by the electrolysis of aluminium oxide dissolved in cryolite. Now answer the following question: Name the process used for the purification of bauxite.

Aluminium is a powerful reducing agent

Aluminium is added in Bessmer process to remove certain impurities, but not in L-D process. This is because

Aluminium is a reddish brown metal and it is a bad conductor of heat and electricity

Aluminium does not react with sodium hydroxide.

Aluminium : Bauxite :: Copper : ___________

Aluminium, Argon , Xenon, Sodium

Aluminium and zinc do not corrode easily even though they arereactive metals. Give reasons for your answer.

Aluminium :660^(@)C :: Copper : ____________

Alumina is mixed with cryolite and subjected to electrolysis to extract aluminium. Write the equation of the reduction reaction taking place at negative electrode.

Alumina is mixed with cryolite and subjected to electrolysis to extract aluminium. Why cryolite is added to alumina?

Alumina is mixed with cryolite and subjected to electrolysis to extract aluminium. Which are the ions present in alumina?

'Alum' is an example of

Aluiminium alloyed with gold and silver for making coins and iewels.