15280 + Interview Questions in Chemistry Page 9 InterviewSolution

401.	The following questions refer to the extraction of aluminium and iron from their ores:(a) Name the principle ore from which (i) iron, and (ii) aluminium are extracted.(b) What is the most important chemical process in the extraction of any metal? State how this essential step is carried out in the extraction of: (i) iron, (ii) aluminium.(c) Iron and aluminium ores both, contain impurities. Explain, briefly how these impurities are removed in each case.(d) What is the major impurity present in iron when it is removed from the furnace?Name an alloy of zinc is used in simple voltaic cells.
Answer» The following questions refer to the extraction of aluminium and iron from their ores: (a) Name the principle ore from which (i) iron, and (ii) aluminium are extracted. (b) What is the most important chemical process in the extraction of any metal? State how this essential step is carried out in the extraction of: (i) iron, (ii) aluminium. (c) Iron and aluminium ores both, contain impurities. Explain, briefly how these impurities are removed in each case. (d) What is the major impurity present in iron when it is removed from the furnace? Name an alloy of zinc is used in simple voltaic cells.

Discussion

402.	Acids dissolve most metals, which special mixture of acids is used to dissolve gold?
Answer» Acids dissolve most metals, which special mixture of acids is used to dissolve gold?

Discussion

403.	Q 15/30 The X-X bond length is 1.5 A and Y-Y bondlength is 1.48 Å. If electronegativity values of X and Yare 3 and 3.5 respectively, then Y-X bond length wouldbe1.44 Å0.98 Å1.75 Å0.73 Å
Answer» Q 15/30 The X-X bond length is 1.5 A and Y-Y bondlength is 1.48 Å. If electronegativity values of X and Yare 3 and 3.5 respectively, then Y-X bond length wouldbe1.44 Å0.98 Å1.75 Å0.73 Å

Discussion

404.	41.Atomic no. of anticathode……………….……material in an x-ray tube is 41.wavelength of Kalpha x ray produced in tube is
Answer» 41.Atomic no. of anticathode……………….……material in an x-ray tube is 41.wavelength of Kalpha x ray produced in tube is

Discussion

405.	Question 9(e)Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is(e) weakly alkaline?
Answer» Question 9(e) Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is (e) weakly alkaline?

Discussion

406.	The strength of an acid depends on its tendency to:
Answer» The strength of an acid depends on its tendency to:

Discussion

407.	Which element replaced eka-aluminium in the modern periodic table?
Answer» Which element replaced eka-aluminium in the modern periodic table?

Discussion

408.	Find out the relationship between molecular massesof A and B. Pressure of 1 g of gas A at 27^° C is2 atm. Pressure becomes 3 atm when 2 g ofanother gas B is introduced in the same flask.
Answer» Find out the relationship between molecular massesof A and B. Pressure of 1 g of gas A at 27^° C is2 atm. Pressure becomes 3 atm when 2 g ofanother gas B is introduced in the same flask.

Discussion

409.	Phenol is
Answer» Phenol is

Discussion

410.	The least reactive metal in the given reactions is .Zn(s) + 2AgNO3(aq) → Zn(NO3)2(aq) + 2Ag(s)Fe(s) + 2AgNO3(aq) → Fe(NO3)2(aq) + 2Ag(s)
Answer» The least reactive metal in the given reactions is . $Zn (s) + 2 {AgNO}_{3} (aq) \to Zn {({NO}_{3})}_{2} (aq) + 2 Ag (s)$ $Fe (s) + 2 {AgNO}_{3} (aq) \to Fe {({NO}_{3})}_{2} (aq) + 2 Ag (s)$

Discussion

411.	Normal temperature = ?Normal pressure = ?Standard temperature = ?Standard pressure = ?
Answer» Normal temperature = ? Normal pressure = ? Standard temperature = ? Standard pressure = ?

Discussion

412.	(1)A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.(a) What changes do you expect?(2)A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.(b) Are these changes chemical in nature?(3)A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.(c) Write a word equation for the chemical change, if any.
Answer» (1) A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour. (a) What changes do you expect? (2) A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour. (b) Are these changes chemical in nature? (3) A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour. (c) Write a word equation for the chemical change, if any.

412.

(1)A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.(a) What changes do you expect?(2)A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.(b) Are these changes chemical in nature?(3)A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.(c) Write a word equation for the chemical change, if any.

Answer» (1)

A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.

(a) What changes do you expect?

(2)

A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.

(b) Are these changes chemical in nature?

(3)

A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.

(c) Write a word equation for the chemical change, if any.

Discussion

413.	What property of hydrogen chloride is demonstrated when it is collected by upward displacement of air?
Answer» What property of hydrogen chloride is demonstrated when it is collected by upward displacement of air?

Discussion

414.	Fill in the blanks in the following sentences : (a) Acids have a ___ taste and they turn ___ litmus to ___ . (b) Substances do not show their acidic properties without ___ . (c) Acids produce ___ ions on dissolving in water. (d) Those substances whose smell (or odour) changes in acidic or basic solutions are called ___ indicators. (e) Onion and vanilla extract are ___ indicators.
Answer» Fill in the blanks in the following sentences : (a) Acids have a ___ taste and they turn ___ litmus to ___ . (b) Substances do not show their acidic properties without ___ . (c) Acids produce ___ ions on dissolving in water. (d) Those substances whose smell (or odour) changes in acidic or basic solutions are called ___ indicators. (e) Onion and vanilla extract are ___ indicators.

414.

Fill in the blanks in the following sentences : (a) Acids have a _ taste and they turn _ litmus to _ . (b) Substances do not show their acidic properties without _ . (c) Acids produce _ ions on dissolving in water. (d) Those substances whose smell (or odour) changes in acidic or basic solutions are called _ indicators. (e) Onion and vanilla extract are ___ indicators.

Answer»

Fill in the blanks in the following sentences :

(a) Acids have a ___ taste and they turn ___ litmus to ___ .

(b) Substances do not show their acidic properties without ___ .

(c) Acids produce ___ ions on dissolving in water.

(d) Those substances whose smell (or odour) changes in acidic or basic solutions are called ___ indicators.

(e) Onion and vanilla extract are ___ indicators.

Discussion

415.	What is meant by the term 'weak acid'?
Answer» What is meant by the term 'weak acid'?

Discussion

416.	27. Why the activation energy increase when we use catalyst.and what is activation energy
Answer» 27. Why the activation energy increase when we use catalyst.and what is activation energy

Discussion

417.	a mass at the end of the spring undergoes SHM with frequency 0.5Hz if the attached mass is reduced to one quarter of its value .what is the new frequency?
Answer» a mass at the end of the spring undergoes SHM with frequency 0.5Hz if the attached mass is reduced to one quarter of its value .what is the new frequency?

Discussion

418.	when cis but 2 ene is treated with Br2 in CCl4 medium the product formed will be1) 2R 3S dibromobutane2) 2R 3R dibromobutane3) mixture of (2R 3R) and (2S 3S) dibromobutane
Answer» when cis but 2 ene is treated with Br2 in CCl4 medium the product formed will be 1) 2R 3S dibromobutane 2) 2R 3R dibromobutane 3) mixture of (2R 3R) and (2S 3S) dibromobutane

Discussion

419.	What percentage of energy available at the producer level is transferred at successive trophic levels in a food chain?
Answer» What percentage of energy available at the producer level is transferred at successive trophic levels in a food chain?

Discussion

420.	What do you call the compounds having the same molecular formula but different structural arrangements of atoms?
Answer» What do you call the compounds having the same molecular formula but different structural arrangements of atoms?

Discussion

421.	A is an ore of two metals which undergoes calcination and forms calcium oxide, magnesium oxide and carbon dioxide.Identify A from the following options.
Answer» $A$ is an ore of two metals which undergoes calcination and forms calcium oxide, magnesium oxide and carbon dioxide. Identify $A$ from the following options.

Discussion

422.	Give the necessary conditions and equations of getting ethanol from:(a) an alkyl halide(b) an ethene
Answer» Give the necessary conditions and equations of getting ethanol from: (a) an alkyl halide (b) an ethene

Discussion

423.

Salts A, B, C, D and E undergo reactions (i) to (v) respectively. Identify the anion present in these salts on the basis of these reactions. Tabulate your answers in the format given below:(i) When silver nitrate solution is added to a solution of A, a white precipitate, insoluble in dilute nitric acid, is formed.(ii) Addition of dilute hydrochloric acid to B produces a gas which turns lead acetate paper black.(iii) When a freshly prepared solution of ferrous sulphate is added to a solution of C and concentrated sulphuric acid is gently poured from the side of the test tube, a brown ring is formed.(iv) When dilute sulphuric acid is added to D, a gas is produced which turns acidified potassium dichromate solution from orange to green.(v) Addition of dilute hydrochloric acid to E produces an effervescence. The gas produced turns limewater milky but does not affect acidified potassium dichromate solution. Salt Anion A B C D E

Answer» Salts A, B, C, D and E undergo reactions (i) to (v) respectively. Identify the anion present in these salts on the basis of these reactions. Tabulate your answers in the format given below:

(i) When silver nitrate solution is added to a solution of A, a white precipitate, insoluble in dilute nitric acid, is formed.

(ii) Addition of dilute hydrochloric acid to B produces a gas which turns lead acetate paper black.

(iii) When a freshly prepared solution of ferrous sulphate is added to a solution of C and concentrated sulphuric acid is gently poured from the side of the test tube, a brown ring is formed.

(iv) When dilute sulphuric acid is added to D, a gas is produced which turns acidified potassium dichromate solution from orange to green.

(v) Addition of dilute hydrochloric acid to E produces an effervescence. The gas produced turns limewater milky but does not affect acidified potassium dichromate solution.

Salt	Anion
A
B
C
D
E

Discussion

424.	The substance which gets oxidized to acids on heating them with solutions of potassium permanganate KMnO4 or potassium dichromate K2Cr2O7 is
Answer» The substance which gets oxidized to acids on heating them with solutions of potassium permanganate $K M n O_{4}$ or potassium dichromate $K_{2} C r_{2} O_{7}$ is

Discussion

425.	What is the mass of 56cm3 of carbon monoxide at STP? [C=12;O=16]\|
Answer» What is the mass of $56 c m^{3}$ of carbon monoxide at STP? $[C = 12; O = 16] \|$

Discussion

426.	A gaseous alkane (Cn H2n+2) is exploded with oxygen. The volume of O2 used and CO2 formed are in the ratio of 7:4. Deduce the value of n.
Answer» A gaseous alkane (Cn H2n+2) is exploded with oxygen. The volume of O2 used and CO2 formed are in the ratio of 7:4. Deduce the value of n.

Discussion

427.	Calculate the ph of 0.01 M solution of NH4CN.
Answer» Calculate the ph of 0.01 M solution of NH4CN.

Discussion

428.	Price of a commodity falls from Rs 20 to Rs 15 per unit. Its demand rises from 600 units to 750 units. Calculate its price elasticity of demand.
Answer» Price of a commodity falls from Rs 20 to Rs 15 per unit. Its demand rises from 600 units to 750 units. Calculate its price elasticity of demand.

Discussion

429.	The general formula of cyclic alkanes is-
Answer» The general formula of cyclic alkanes is-

Discussion

430.	Calculate the formula unit masses of ZnO,Na2O,and K2CO3. Given atomic masses of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u, and O = 16 u.
Answer» Calculate the formula unit masses of $Z n O, N a_{2} O, a n d K_{2} C O_{3}$ . Given atomic masses of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u, and O = 16 u.

Discussion

431.	(i) What is an alloy?(ii) What is the special property of duralumin and type metal?
Answer» (i) What is an alloy? (ii) What is the special property of duralumin and type metal?

Discussion

432.	Which of the following statement is true in concentration of ore?
Answer» Which of the following statement is true in concentration of ore?

Discussion

433.	What is an alloy? Give two examples with their chemical composition.
Answer» What is an alloy? Give two examples with their chemical composition.

Discussion

434.	Element X reacts with a chloride to give XCl. X is most likely to be in the same period of the periodic table. Find X.
Answer» Element X reacts with a chloride to give XCl. X is most likely to be in the same period of the periodic table. Find X.

Discussion

435.	Name the following:(i) Gas produced in air during lightning.(ii) Gas obtained by treating manganese with 1% nitric acid.(iii) Salt referred to as Chile saltpetre.(iv) Salt used in the laboratory to prepare nitric acid.(v) Products obtained by the catalytic oxidation of ammonia.(vi) Products obtained by heating concentrated nitric acid.(vii) Two coloured nitrates.
Answer» Name the following: (i) Gas produced in air during lightning. (ii) Gas obtained by treating manganese with 1% nitric acid. (iii) Salt referred to as Chile saltpetre. (iv) Salt used in the laboratory to prepare nitric acid. (v) Products obtained by the catalytic oxidation of ammonia. (vi) Products obtained by heating concentrated nitric acid. (vii) Two coloured nitrates.

Discussion

436.	What is gp and hp
Answer» What is gp and hp

Discussion

437.	Choose the statement which best describe ester: Statement 1: Ester is formed due to the reaction between ethanol and Ethanoic acid. Statement 2: Esters are sweet smelling substances. Statement 3: Ester is formed due to the reaction between an acid and a carboxylic acid. Statement 4: On treating with sodium hydroxide, ester is converted back to alcohol and sodium salt of carboxylic acid. Statement 5: Preparation of soap involves treating of sodium hydroxide with ester.
Answer» Choose the statement which best describe ester: Statement 1: Ester is formed due to the reaction between ethanol and Ethanoic acid. Statement 2: Esters are sweet smelling substances. Statement 3: Ester is formed due to the reaction between an acid and a carboxylic acid. Statement 4: On treating with sodium hydroxide, ester is converted back to alcohol and sodium salt of carboxylic acid. Statement 5: Preparation of soap involves treating of sodium hydroxide with ester.

437.

Choose the statement which best describe ester: Statement 1: Ester is formed due to the reaction between ethanol and Ethanoic acid. Statement 2: Esters are sweet smelling substances. Statement 3: Ester is formed due to the reaction between an acid and a carboxylic acid. Statement 4: On treating with sodium hydroxide, ester is converted back to alcohol and sodium salt of carboxylic acid. Statement 5: Preparation of soap involves treating of sodium hydroxide with ester.

Answer»

Choose the statement which best describe ester:

Statement 1: Ester is formed due to the reaction between ethanol and Ethanoic acid.

Statement 2: Esters are sweet smelling substances.

Statement 3: Ester is formed due to the reaction between an acid and a carboxylic acid.

Statement 4: On treating with sodium hydroxide, ester is converted back to alcohol and sodium salt of carboxylic acid.

Statement 5: Preparation of soap involves treating of sodium hydroxide with ester.

Discussion

438.	O2 is converted into O3 by the action of : (a) infrared radiations (b) ultraviolet radiations (b) gamma radiations (d) cosmic radiations
Answer» $O_{2}$ is converted into $O_{3}$ by the action of : (a) infrared radiations (b) ultraviolet radiations (b) gamma radiations (d) cosmic radiations

438.

O2 is converted into O3 by the action of : (a) infrared radiations (b) ultraviolet radiations (b) gamma radiations (d) cosmic radiations

Answer»

$O_{2}$ is converted into $O_{3}$ by the action of :

(a) infrared radiations (b) ultraviolet radiations

(b) gamma radiations (d) cosmic radiations

Discussion

439.	How do enzymes act as bio catalysts? (2 points)
Answer» How do enzymes act as bio catalysts? (2 points)

Discussion

440.	(a) Name the charged particles which attract one another to form electrovalent compounds.(b) In the formation of electrovalent compounds, electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compound?(c) The electronic configuration of N2 is 2, 5. How many electrons in the outer shell of a N atom are not involved in the formation of a nitrogen molecule?(d) In the formation of magnesium chloride (by direct combination between magnesium and chlorine) name the substance that is oxidised and the substance that is reduced.
Answer» (a) Name the charged particles which attract one another to form electrovalent compounds. (b) In the formation of electrovalent compounds, electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compound? (c) The electronic configuration of N₂ is 2, 5. How many electrons in the outer shell of a N atom are not involved in the formation of a nitrogen molecule? (d) In the formation of magnesium chloride (by direct combination between magnesium and chlorine) name the substance that is oxidised and the substance that is reduced.

Discussion

441.	What is the oxidation number/state of nitrogen in NCl3 ?
Answer» What is the oxidation number/state of nitrogen in $N C l_{3}$ ?

Discussion

442.	How do the atomic radii of elements change as we go from left to right in a period of the periodic table?
Answer» How do the atomic radii of elements change as we go from left to right in a period of the periodic table?

Discussion

443.	All the X are Y but all Y are not X. What are X and Y?
Answer» All the X are Y but all Y are not X. What are X and Y?

Discussion

444.	Q.1)0.45 g of ab organic compound gave 0.44 g of Co2 and 0.09 g of H2O. The molecular mass of the compound is 90 amu.Calculate the molecular formula.
Answer» Q.1)0.45 g of ab organic compound gave 0.44 g of Co2 and 0.09 g of H2O. The molecular mass of the compound is 90 amu.Calculate the molecular formula.

Discussion

445.	Why does lead doesn't react with water?
Answer» Why does lead doesn't react with water?

Discussion

446.	Convert but 2 ene into n-octane
Answer» Convert but 2 ene into n-octane

Discussion

447.	The bonds between P atoms and Cl atoms in PCl5 are likely to be
Answer» The bonds between P atoms and Cl atoms in $P C l_{5}$ are likely to be

Discussion

448.	n belongs to W.In this statement what does W set contains.
Answer» n belongs to W. In this statement what does W set contains.

Discussion

449.	Name the products formed and write an equation when ethyne is added to the following in an inert solvent : (a) chlorine, (c) iodine, (b) bromine, (d) hydrogen. (e) excess of hydrochloric acid.
Answer» Name the products formed and write an equation when ethyne is added to the following in an inert solvent : (a) chlorine, (c) iodine, (b) bromine, (d) hydrogen. (e) excess of hydrochloric acid.

Discussion

450.	Calculate the weight of Sodium carbonate which have same no of atom as no of proton present in 10g of calcium carbonate??
Answer» Calculate the weight of Sodium carbonate which have same no of atom as no of proton present in 10g of calcium carbonate??

Discussion

Explore topic-wise InterviewSolutions in .

Acids dissolve most metals, which special mixture of acids is used to dissolve gold?

Q 15/30 The X-X bond length is 1.5 A and Y-Y bondlength is 1.48 Å. If electronegativity values of X and Yare 3 and 3.5 respectively, then Y-X bond length wouldbe1.44 Å0.98 Å1.75 Å0.73 Å

41.Atomic no. of anticathode……………….……material in an x-ray tube is 41.wavelength of Kalpha x ray produced in tube is

Question 9(e)Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is(e) weakly alkaline?

The strength of an acid depends on its tendency to:

Which element replaced eka-aluminium in the modern periodic table?

Find out the relationship between molecular massesof A and B. Pressure of 1 g of gas A at 27^° C is2 atm. Pressure becomes 3 atm when 2 g ofanother gas B is introduced in the same flask.

Phenol is

The least reactive metal in the given reactions is .Zn(s) + 2AgNO3(aq) → Zn(NO3)2(aq) + 2Ag(s)Fe(s) + 2AgNO3(aq) → Fe(NO3)2(aq) + 2Ag(s)

Normal temperature = ?Normal pressure = ?Standard temperature = ?Standard pressure = ?

What property of hydrogen chloride is demonstrated when it is collected by upward displacement of air?

What is meant by the term 'weak acid'?

27. Why the activation energy increase when we use catalyst.and what is activation energy

a mass at the end of the spring undergoes SHM with frequency 0.5Hz if the attached mass is reduced to one quarter of its value .what is the new frequency?

when cis but 2 ene is treated with Br2 in CCl4 medium the product formed will be1) 2R 3S dibromobutane2) 2R 3R dibromobutane3) mixture of (2R 3R) and (2S 3S) dibromobutane

What percentage of energy available at the producer level is transferred at successive trophic levels in a food chain?

What do you call the compounds having the same molecular formula but different structural arrangements of atoms?

A is an ore of two metals which undergoes calcination and forms calcium oxide, magnesium oxide and carbon dioxide.​​​Identify A from the following options.

Give the necessary conditions and equations of getting ethanol from:(a) an alkyl halide(b) an ethene

The substance which gets oxidized to acids on heating them with solutions of potassium permanganate KMnO4 or potassium dichromate K2Cr2O7 is

What is the mass of 56cm3 of carbon monoxide at STP? [C=12;O=16]|

A gaseous alkane (Cn H2n+2) is exploded with oxygen. The volume of O2 used and CO2 formed are in the ratio of 7:4. Deduce the value of n.

Calculate the ph of 0.01 M solution of NH4CN.

Price of a commodity falls from Rs 20 to Rs 15 per unit. Its demand rises from 600 units to 750 units. Calculate its price elasticity of demand.

The general formula of cyclic alkanes is-

Calculate the formula unit masses of ZnO,Na2O,and K2CO3. Given atomic masses of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u, and O = 16 u.

(i) What is an alloy?(ii) What is the special property of duralumin and type metal?

Which of the following statement is true in concentration of ore?

What is an alloy? Give two examples with their chemical composition.

Element X reacts with a chloride to give XCl. X is most likely to be in the same period of the periodic table. Find X.

What is gp and hp

O2 is converted into O3 by the action of : (a) infrared radiations (b) ultraviolet radiations (b) gamma radiations (d) cosmic radiations

How do enzymes act as bio catalysts? (2 points)

What is the oxidation number/state of nitrogen in NCl3 ?

How do the atomic radii of elements change as we go from left to right in a period of the periodic table?

All the X are Y but all Y are not X. What are X and Y?

Q.1)0.45 g of ab organic compound gave 0.44 g of Co2 and 0.09 g of H2O. The molecular mass of the compound is 90 amu.Calculate the molecular formula.

Why does lead doesn't react with water?

Convert but 2 ene into n-octane

The bonds between P atoms and Cl atoms in PCl5 are likely to be

n belongs to W.In this statement what does W set contains.

Name the products formed and write an equation when ethyne is added to the following in an inert solvent : (a) chlorine, (c) iodine, (b) bromine, (d) hydrogen. (e) excess of hydrochloric acid.

Calculate the weight of Sodium carbonate which have same no of atom as no of proton present in 10g of calcium carbonate??

A is an ore of two metals which undergoes calcination and forms calcium oxide, magnesium oxide and carbon dioxide.Identify A from the following options.