15280 + Interview Questions in Chemistry Page 50 InterviewSolution

2451.	What is photolytic decomposition
Answer» What is photolytic decomposition

Discussion

2452.	explain the process of leaching with all the chemical reactions involved in it
Answer» explain the process of leaching with all the chemical reactions involved in it

Discussion

2453.	Complete the following reactions:CaCO3+H2O+CO2→ Ca(HCO3)2 + →Ca(NO3)2+CO2+H2O
Answer» Complete the following reactions: $C a C O_{3} + H_{2} O + C O_{2} \to$ $C a (H C O_{3})_{2}$ $+$ $\to C a (N O_{3})_{2} + C O_{2} + H_{2} O$

Discussion

2454.	For which ore of the metal, froth floatation method is used for concentration?
Answer» For which ore of the metal, froth floatation method is used for concentration?

Discussion

2455.	In IUPAC name of the following compound, the prefix bacause of -Br and suffix bacause of C = 0 will be respectively
Answer» In IUPAC name of the following compound, the prefix bacause of -Br and suffix bacause of C = 0 will be respectively

2455.

In IUPAC name of the following compound, the prefix bacause of -Br and suffix bacause of C = 0 will be respectively

Answer»

In IUPAC name of the following compound, the prefix bacause of -Br and suffix bacause of C = 0 will be respectively

Discussion

2456.	Q A gas gas reaction, A2(g) - - - - - - B(g) + 1/2C(g) Shows increase in pressure from 100 mm to 120 mm 5 minutes. The rate of disappearance of A2 is.
Answer» Q A gas gas reaction, A2(g) - - - - - - B(g) + 1/2C(g) Shows increase in pressure from 100 mm to 120 mm 5 minutes. The rate of disappearance of A2 is.

Discussion

2457.	If 80g naoh reacts with 36.5g hcl in dilute aqueous solution then the enthalpy of neutralization is
Answer» If 80g naoh reacts with 36.5g hcl in dilute aqueous solution then the enthalpy of neutralization is

Discussion

2458.	The equivalents of ethylene diamine required to replace the neutral ligands from the coordination sphere of the trans-complex of CoCl3.4NH3 is
Answer» The equivalents of ethylene diamine required to replace the neutral ligands from the coordination sphere of the trans-complex of $C o C l_{3} .4 N H_{3}$ is

Discussion

2459.	Ajanta Company Limited having a normal capital of Rs. 3,00,000 divided into shares of Rs.10 each offered for public subscriptions of 20,000 shares payable at Rs.2 on application; Rs.3 on allotment and the balance in two calls of Rs.2.50 each. Application were received by the company for 24,000 shares. Application for 20,000 shares were accepted in full and the shares allotted. Applications for the remaining shares were rejected and the application money was refunded. All money due were received with the exception for the final call on 600 shares which were forfeited after legal formalities were fulfilled. 400 shares of the forfeited share were reissued at Rs.9 per share. Record necessary journal entries and prepare the balance sheet showing the amount transferred to capital reserve and the balance in share forfeiture account.
Answer» Ajanta Company Limited having a normal capital of Rs. 3,00,000 divided into shares of Rs.10 each offered for public subscriptions of 20,000 shares payable at Rs.2 on application; Rs.3 on allotment and the balance in two calls of Rs.2.50 each. Application were received by the company for 24,000 shares. Application for 20,000 shares were accepted in full and the shares allotted. Applications for the remaining shares were rejected and the application money was refunded. All money due were received with the exception for the final call on 600 shares which were forfeited after legal formalities were fulfilled. 400 shares of the forfeited share were reissued at Rs.9 per share. Record necessary journal entries and prepare the balance sheet showing the amount transferred to capital reserve and the balance in share forfeiture account.

Discussion

2460.	18. What happens when an alloy of copper and zinc reacts with dilute HCl.
Answer» 18. What happens when an alloy of copper and zinc reacts with dilute HCl.

Discussion

2461.	Reactivity order for chlorine in orthochlorotoulene ,parachlorotoulene,metacholorotoulene and orthochloronitrobenzene, parachloronitrobenzene,metachloronitrobenzene is?
Answer» Reactivity order for chlorine in orthochlorotoulene ,parachlorotoulene,metacholorotoulene and orthochloronitrobenzene, parachloronitrobenzene,metachloronitrobenzene is?

Discussion

2462.	Compare C-O bond length among CO, CO2, (CO3) ^(2-) [carbonate] elaborately by finding it's bond order
Answer» Compare C-O bond length among CO, CO2, (CO3) ^(2-) [carbonate] elaborately by finding it's bond order

Discussion

2463.	(a) Why do we classify elements?(b) What were the two criteria used by Mendeleev in creating his Periodic Table?(c) Why did Mendeleev leave some gaps in his Periodic Table?(d) In Mendeleev's Periodic Table, why was there no mention of Noble gases such as Helium, Neon and Argon?(e) Would you place the two isotopes of chlorine, Cl-35 and Cl-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
Answer» (a) Why do we classify elements? (b) What were the two criteria used by Mendeleev in creating his Periodic Table? (c) Why did Mendeleev leave some gaps in his Periodic Table? (d) In Mendeleev's Periodic Table, why was there no mention of Noble gases such as Helium, Neon and Argon? (e) Would you place the two isotopes of chlorine, Cl-35 and Cl-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.

Discussion

2464.	What is molecular mass and atomic mass
Answer» What is molecular mass and atomic mass

Discussion

2465.	Write the equation for each of the following reactions:(i) Sulphur is heated with concentrated sulphuric acid.(ii) Concentrated sulphuric acid is poured over sugar.
Answer» Write the equation for each of the following reactions: (i) Sulphur is heated with concentrated sulphuric acid. (ii) Concentrated sulphuric acid is poured over sugar.

Discussion

2466.	Formula for Ap
Answer» Formula for Ap

Discussion

2467.	Number of d-electron retained in ferrous ion is
Answer» Number of d-electron retained in ferrous ion is

Discussion

2468.	How is: (a) methane and (b) ethane prepared in the laboratory? [2 MARKS]
Answer» How is: (a) methane and (b) ethane prepared in the laboratory? [2 MARKS]

Discussion

2469.	What are polar covalent compounds?
Answer» What are polar covalent compounds?

Discussion

2470.	Salt A, commonly used in bakery products, on heating, gets converted into another salt B. B is used for the removal of hardness of water and a gas C is evolved. The gas C when passed through lime water, turns it milky. Identify A, B, and C.
Answer» Salt A, commonly used in bakery products, on heating, gets converted into another salt B. B is used for the removal of hardness of water and a gas C is evolved. The gas C when passed through lime water, turns it milky. Identify A, B, and C.

Discussion

2471.	An example of combination reaction is
Answer» An example of combination reaction is

Discussion

2472.	why are ores of copper are partially roasted?
Answer» why are ores of copper are partially roasted?

Discussion

2473.	Consider a hydrogen-like ionized atom with atomic number Z with a single electron. In the emission spectrum of this atom, the photon emitted in the n = 2 to n = 1 transition has energy 74.8 eV higher than the photon emitted in the n = 3 to n = 2 transition. The ionization energy of the hydrogen atom is 13.6 eV. The value of Z is
Answer» Consider a hydrogen-like ionized atom with atomic number Z with a single electron. In the emission spectrum of this atom, the photon emitted in the n = $2$ to n = $1$ transition has energy $74.8$ eV higher than the photon emitted in the n = $3$ to n = $2$ transition. The ionization energy of the hydrogen atom is $13.6$ eV. The value of Z is

Discussion

2474.	Write short notes on:(1) Catenation(2)Functional group(3) Homologous series
Answer» Write short notes on: (1) Catenation (2)Functional group (3) Homologous series

2474.

Write short notes on:(1) Catenation(2)Functional group(3) Homologous series

Answer»

Write short notes on:

(1) Catenation

(2)Functional group

(3) Homologous series

Discussion

2475.	Are noble gases metals, nonmetals or metalloids?
Answer» Are noble gases metals, nonmetals or metalloids?

Discussion

2476.	To protect iron from rusting, it is coated with a thin layer of zinc. Name this process.
Answer» To protect iron from rusting, it is coated with a thin layer of zinc. Name this process.

Discussion

2477.	t-butyl chloride combine with hydroxy anion by which mechanism and why?(1) SN1 (2) SN2(3) SE1 (4) SE2
Answer» t-butyl chloride combine with hydroxy anion by which mechanism and why? (1) SN1 (2) SN2 (3) SE1 (4) SE2

Discussion

2478.	One of the following ocmpounds in not ionic in nature. This compound is: (a) Lithium chloride (b) Ammonium chloride (c) Calcium chloride (d) Carbon tetrachloride
Answer» One of the following ocmpounds in not ionic in nature. This compound is: (a) Lithium chloride (b) Ammonium chloride (c) Calcium chloride (d) Carbon tetrachloride

Discussion

2479.	52 The PH of an aqueous solution of 0.1M solution of salt of weak base (kb=1.0ten ki power -10) and a strong acid is:
Answer» 52 The PH of an aqueous solution of 0.1M solution of salt of weak base (kb=1.0ten ki power -10) and a strong acid is:

Discussion

2480.	While your siblings are eagerly anticipating their first batches of Gold and diamond, you are still yet to get a single gram of copper! Armed with the know-how of extracting copper, you smelt the calcine from the roasting process in a blast furnace. What is the smelt composed of?
Answer» While your siblings are eagerly anticipating their first batches of Gold and diamond, you are still yet to get a single gram of copper! Armed with the know-how of extracting copper, you smelt the calcine from the roasting process in a blast furnace. What is the smelt composed of?

Discussion

2481.	(a) (i) A compound has the following percentage composition by mass: carbon 14.4%, hydrogen 1.2% and chlorine 84.5%. Determine the empirical formula of this compound. Work correct to 1 decimal place. (H = 1; C = 12; Cl = 35.5)(ii) The relative molecular mass of this compound is 168, so what is its molecular formula?(iii) By what type of reaction could this compound be obtained from ethyne?(b) From the equation:C + 2H2SO4 → CO2 + 2H2O + 2SO2Calculate:(i) the mass of carbon oxidised by 49 g of sulphuric acid (C = 12; relative molecular mass of sulphuric acid = 98).(ii) the volume of sulphur dioxide measured at STP, liberated at the same time.(Volume occupied by 1 mole of a gas at STP is 22.4 dm3).
Answer» (a) (i) A compound has the following percentage composition by mass: carbon 14.4%, hydrogen 1.2% and chlorine 84.5%. Determine the empirical formula of this compound. Work correct to 1 decimal place. (H = 1; C = 12; Cl = 35.5) (ii) The relative molecular mass of this compound is 168, so what is its molecular formula? (iii) By what type of reaction could this compound be obtained from ethyne? (b) From the equation: C + 2H₂SO₄ $\overset{}{\to}$ CO₂ + 2H₂O + 2SO₂ Calculate: (i) the mass of carbon oxidised by 49 g of sulphuric acid (C = 12; relative molecular mass of sulphuric acid = 98). (ii) the volume of sulphur dioxide measured at STP, liberated at the same time. (Volume occupied by 1 mole of a gas at STP is 22.4 dm³).

Discussion

2482.	First ionization enthalpy of two elements X and Y are 500 kJ mol−1 and 375 kJ mol−1respectively. Comment about their relative positive in a group as well as in a period.
Answer» First ionization enthalpy of two elements X and Y are $500 k J m o l^{-} 1$ and $375 k J m o l^{-} 1$ respectively. Comment about their relative positive in a group as well as in a period.

Discussion

2483.	The least metallic element of group 2 is
Answer» The least metallic element of group 2 is

Discussion

2484.	Write a balanced equation for the reactions that occur when: (i) Iron react with steam. (ii) Calcium and potassium react with water.
Answer» Write a balanced equation for the reactions that occur when: (i) Iron react with steam. (ii) Calcium and potassium react with water.

Discussion

2485.	The entropy of vaporization of benzene is 85 JK^{-1}mol^{-1}. When 117 g benzene vaporizes at its normal boiling point then the entropy change of surrounding is : - (1) -85 JK^{-1} (2) -85 × 1.5 JK^{-1 } (3 ) 85 × 1.5 JK^{-1 }(4) None of these .
Answer» The entropy of vaporization of benzene is 85 JK^{-1}mol^{-1}. When 117 g benzene vaporizes at its normal boiling point then the entropy change of surrounding is : - (1) -85 JK^{-1} (2) -85 × 1.5 JK^{-1 } (3 ) 85 × 1.5 JK^{-1 }(4) None of these .

Discussion

2486.	When sodium reacts with ethanol, which of the following gases is released?
Answer» When sodium reacts with ethanol, which of the following gases is released?

Discussion

2487.	One formula unit of MgBr2 is one Mg+2 ion and two Br-1 ions and one formula unit of water is one H2O molecule.why one unit of water is written in the form of molecule where as MgBr2 is written in form of ions??
Answer» One formula unit of MgBr2 is one Mg+2 ion and two Br-1 ions and one formula unit of water is one H2O molecule.why one unit of water is written in the form of molecule where as MgBr2 is written in form of ions??

Discussion

2488.	Write one equation each for the decomposition reactions where energy is supplied in the form of (a) heat, (b) light, and (c) electricity .
Answer» Write one equation each for the decomposition reactions where energy is supplied in the form of (a) heat, (b) light, and (c) electricity .

Discussion

2489.	Heat of neutralisation for weak acid reacts with another weak base and what for strong base reacting with weak acid
Answer» Heat of neutralisation for weak acid reacts with another weak base and what for strong base reacting with weak acid

Discussion

2490.	A,B and C are three elements which undergo chemical changes as shown below:A2O3+2B→B2O3+2A3CSO4+2B→B2(SO4)3+3C3CO+2A→A2O3+3CThe most reactive and the least reactive element are respectively:
Answer» $A, B$ and $C$ are three elements which undergo chemical changes as shown below: $A_{2} O_{3} + 2 B \to B_{2} O_{3} + 2 A$ $3 C S O_{4} + 2 B \to B_{2} (S O_{4})_{3} + 3 C$ $3 C O + 2 A \to A_{2} O_{3} + 3 C$ The most reactive and the least reactive element are respectively:

Discussion

2491.	How many structure or carboxylic acids and ester are possible for the following molecular formula C6 H12 O2 & C6 H12 O2
Answer» How many structure or carboxylic acids and ester are possible for the following molecular formula C6 H12 O2 & C6 H12 O2

Discussion

2492.	(c) Identify the organic compounds A to E in the following reactions:(i) CH3COONa SodaLime A Cl2 −−−−−−−−−→ B KOH −−−−−−−−−−−−→Aqueous C (ii) C2H5OH+CH3COOH Conc.H2SO4 −−−−−−−−−−−−−−−−→D+E
Answer» (c) Identify the organic compounds A to E in the following reactions: (i) ${CH}_{3} COONa \frac{Soda}{Lime} A {Cl}_{2} - -------- \to B KOH - ----------- \to Aqueous C$ (ii) $C_{2} H_{5} OH + {CH}_{3} COOH Conc . H_{2} {SO}_{4} - --------------- \to D + E$

Discussion

2493.	In the following compounds, which is a most basic oxide?Na2O, CaO, MgO, FeO ?Shouldn't it be CaO?
Answer» In the following compounds, which is a most basic oxide? Na2O, CaO, MgO, FeO ? Shouldn't it be CaO?

Discussion

2494.	21. Which is the most covalent and why? a)c-o b)c-br c)c-s d)c-f
Answer» 21. Which is the most covalent and why? a)c-o b)c-br c)c-s d)c-f

Discussion

2495.	Th pH of 0.1 M solution of the following substances increases in the order.
Answer» Th pH of 0.1 M solution of the following substances increases in the order.

Discussion

2496.	Name one animal and one plant whose stings contain formic acid (or methanoic acid).
Answer» Name one animal and one plant whose stings contain formic acid (or methanoic acid).

Discussion

2497.	How many sigma and pi bonds are there in SO42-?
Answer» How many sigma and pi bonds are there in SO42-?

Discussion

2498.	In a simultaneous throw of a pair of dice, find the probability of getting same value on both.
Answer» In a simultaneous throw of a pair of dice, find the probability of getting same value on both.

Discussion

2499.	Which of following are natural indicators?
Answer» Which of following are natural indicators?

Discussion

2500.	27. in pcl five decomposition at final mole why will not take two mines to alpha
Answer» 27. in pcl five decomposition at final mole why will not take two mines to alpha

Discussion

Explore topic-wise InterviewSolutions in .

What is photolytic decomposition

explain the process of leaching with all the chemical reactions involved in it

Complete the following reactions:CaCO3+H2O+CO2→ Ca(HCO3)2 + →Ca(NO3)2+CO2+H2O

For which ore of the metal, froth floatation method is used for concentration?

In IUPAC name of the following compound, the prefix bacause of -Br and suffix bacause of C = 0 will be respectively

Q A gas gas reaction, A2(g) - - - - - - B(g) + 1/2C(g) Shows increase in pressure from 100 mm to 120 mm 5 minutes. The rate of disappearance of A2 is.

If 80g naoh reacts with 36.5g hcl in dilute aqueous solution then the enthalpy of neutralization is

The equivalents of ethylene diamine required to replace the neutral ligands from the coordination sphere of the trans-complex of CoCl3.4NH3 is

18. What happens when an alloy of copper and zinc reacts with dilute HCl.

Reactivity order for chlorine in orthochlorotoulene ,parachlorotoulene,metacholorotoulene and orthochloronitrobenzene, parachloronitrobenzene,metachloronitrobenzene is?

Compare C-O bond length among CO, CO2, (CO3) ^(2-) [carbonate] elaborately by finding it's bond order

What is molecular mass and atomic mass

Write the equation for each of the following reactions:(i) Sulphur is heated with concentrated sulphuric acid.(ii) Concentrated sulphuric acid is poured over sugar.

Formula for Ap

Number of d-electron retained in ferrous ion is

How is: (a) methane and (b) ethane prepared in the laboratory? [2 MARKS]

What are polar covalent compounds?

Salt A, commonly used in bakery products, on heating, gets converted into another salt B. B is used for the removal of hardness of water and a gas C is evolved. The gas C when passed through lime water, turns it milky. Identify A, B, and C.

An example of combination reaction is

why are ores of copper are partially roasted?

Write short notes on:(1) Catenation(2)Functional group(3) Homologous series

Are noble gases metals, nonmetals or metalloids?

To protect iron from rusting, it is coated with a thin layer of zinc. Name this process.

t-butyl chloride combine with hydroxy anion by which mechanism and why?(1) SN1 (2) SN2(3) SE1 (4) SE2

One of the following ocmpounds in not ionic in nature. This compound is: (a) Lithium chloride (b) Ammonium chloride (c) Calcium chloride (d) Carbon tetrachloride

52 The PH of an aqueous solution of 0.1M solution of salt of weak base (kb=1.0ten ki power -10) and a strong acid is:

While your siblings are eagerly anticipating their first batches of Gold and diamond, you are still yet to get a single gram of copper! Armed with the know-how of extracting copper, you smelt the calcine from the roasting process in a blast furnace. What is the smelt composed of?

First ionization enthalpy of two elements X and Y are 500 kJ mol−1 and 375 kJ mol−1respectively. Comment about their relative positive in a group as well as in a period.

The least metallic element of group 2 is

Write a balanced equation for the reactions that occur when: (i) Iron react with steam. (ii) Calcium and potassium react with water.

The entropy of vaporization of benzene is 85 JK^{-1}mol^{-1}. When 117 g benzene vaporizes at its normal boiling point then the entropy change of surrounding is : - (1) -85 JK^{-1} (2) -85 × 1.5 JK^{-1 } (3 ) 85 × 1.5 JK^{-1 }(4) None of these .

When sodium reacts with ethanol, which of the following gases is released?

One formula unit of MgBr2 is one Mg+2 ion and two Br-1 ions and one formula unit of water is one H2O molecule.why one unit of water is written in the form of molecule where as MgBr2 is written in form of ions??

Write one equation each for the decomposition reactions where energy is supplied in the form of (a) heat, (b) light, and (c) electricity .

Heat of neutralisation for weak acid reacts with another weak base and what for strong base reacting with weak acid

A,B and C are three elements which undergo chemical changes as shown below:A2O3+2B→B2O3+2A3CSO4+2B→B2(SO4)3+3C3CO+2A→A2O3+3CThe most reactive and the least reactive element are respectively:

How many structure or carboxylic acids and ester are possible for the following molecular formula C6 H12 O2 & C6 H12 O2

(c) Identify the organic compounds A to E in the following reactions:(i) CH3COONa SodaLime A Cl2 −−−−−−−−−→ B KOH −−−−−−−−−−−−→Aqueous C (ii) C2H5OH+CH3COOH Conc.H2SO4 −−−−−−−−−−−−−−−−→D+E

In the following compounds, which is a most basic oxide?Na2O, CaO, MgO, FeO ?Shouldn't it be CaO?

21. Which is the most covalent and why? a)c-o b)c-br c)c-s d)c-f

Th pH of 0.1 M solution of the following substances increases in the order.

Name one animal and one plant whose stings contain formic acid (or methanoic acid).

How many sigma and pi bonds are there in SO42-?

In a simultaneous throw of a pair of dice, find the probability of getting same value on both.

Which of following are natural indicators?

27. in pcl five decomposition at final mole why will not take two mines to alpha