15280 + Interview Questions in Chemistry Page 140 InterviewSolution

6951.	Mercury + sulphuric acid → No reaction. This is because of :-
Answer» Mercury + sulphuric acid $\to$ No reaction. This is because of :-

Discussion

6952.	how to calculate volume strength for any compounds?
Answer» how to calculate volume strength for any compounds?

Discussion

6953.	The correct order of the atomic radii of C,Cs,Al and S is:
Answer» The correct order of the atomic radii of $C, C s, A l$ and $S$ is:

Discussion

6954.	Sulphuric acid is also known as the "___".
Answer» Sulphuric acid is also known as the "___".

Discussion

6955.	When 1 mole of N, and 1 mole of H, is encosecin 3L vessel and the reaction is allowed to atair.equilibrium, it is found that at equilibrium theremole of H The number of moles of NH, formewould be21+x)(2)32x(1)(1-x)(4)(3)A212
Answer» When 1 mole of N, and 1 mole of H, is encosecin 3L vessel and the reaction is allowed to atair.equilibrium, it is found that at equilibrium theremole of H The number of moles of NH, formewould be21+x)(2)32x(1)(1-x)(4)(3)A212

Discussion

6956.	How copper can be reduced by coke in extraction
Answer» How copper can be reduced by coke in extraction

Discussion

6957.	2 bromo pentane is heated with EtO-Na+ in ethanol the major product obtained is
Answer» 2 bromo pentane is heated with EtO-Na+ in ethanol the major product obtained is

Discussion

6958.	What do you mean by chemical reaction?
Answer» What do you mean by chemical reaction?

Discussion

6959.	19. What will happen when CH3CH2OH reacts with concentrated Sulphuric acid at 180 C
Answer» 19. What will happen when CH3CH2OH reacts with concentrated Sulphuric acid at 180 C

Discussion

6960.	Non metallic oxides are:
Answer» Non metallic oxides are:

Discussion

6961.	30. Which carbocation is more stable - benzyl or tertiary?
Answer» 30. Which carbocation is more stable - benzyl or tertiary?

Discussion

6962.	If mole fraction of urea in aqueous solution is 0.1 then mass percentage of urea in the solution will be (molar mass of urea = 60 g mol–1)
Answer» If mole fraction of urea in aqueous solution is 0.1 then mass percentage of urea in the solution will be (molar mass of urea = 60 g mol–1)

Discussion

6963.	25. For dilute solutions is molarity equal to molality of the solution. Why why not
Answer» 25. For dilute solutions is molarity equal to molality of the solution. Why why not

Discussion

6964.	a gas in a cylinder is held at a cons†an t pressure 1.7×10^5 Pa and is cooled and compressed from 1.20m^3 to 0.8m^3. The internal energy of the gas decreases by 1.1×10^5J. (a) does it matter whether or not the gas is ideal. if no then why not ?
Answer» a gas in a cylinder is held at a cons†an t pressure 1.7×10^5 Pa and is cooled and compressed from 1.20m^3 to 0.8m^3. The internal energy of the gas decreases by 1.1×10^5J. (a) does it matter whether or not the gas is ideal. if no then why not ?

Discussion

6965.	Q-1)Account for the following (a) CaCl is used to clear snow from roads in hill starions. b)Ethylene glycol is used as antifreere solution in radiators of vehicles in cold countries c)The freezing point depression of 0.01 m Nacl is nearly twice that of 0.01 m glucose solution Q-2)Give reasons for the following a)RBC's swell up and finally burst when placed in 0.19% Nacl solution (b) When fruits and vegetables that have been dried are placed In water, they slowly swell and return to original form (c) A person suffering from high blood pressure is advised to take less amount of table salt. Q-3)What happens when: a)aluminium reacts with t-butylalcohol b)cumene is oxidised in the presence of air and the product formed is treated with dilute acid. c)phenol is treated with conc. HNO3
Answer» Q-1)Account for the following (a) CaCl is used to clear snow from roads in hill starions. b)Ethylene glycol is used as antifreere solution in radiators of vehicles in cold countries c)The freezing point depression of 0.01 m Nacl is nearly twice that of 0.01 m glucose solution Q-2)Give reasons for the following a)RBC's swell up and finally burst when placed in 0.19% Nacl solution (b) When fruits and vegetables that have been dried are placed In water, they slowly swell and return to original form (c) A person suffering from high blood pressure is advised to take less amount of table salt. Q-3)What happens when: a)aluminium reacts with t-butylalcohol b)cumene is oxidised in the presence of air and the product formed is treated with dilute acid. c)phenol is treated with conc. HNO3

Discussion

6966.	an oxide of metal have 20 pecentage oxygen the equivalent weight of oxide is
Answer» an oxide of metal have 20 pecentage oxygen the equivalent weight of oxide is

Discussion

6967.	When an acid produces H+ ions in solution does that mean that they lose their acidity?? Is the process of releasing H+ ions related to dilution??
Answer» When an acid produces H+ ions in solution does that mean that they lose their acidity?? Is the process of releasing H+ ions related to dilution??

Discussion

6968.	A. Why AgBr stored in dark coloured bottles. B. Write electron dot structure for the compound formed between X (atomic no. 12)and Y (atomic no. 17).
Answer» A. Why AgBr stored in dark coloured bottles. B. Write electron dot structure for the compound formed between X (atomic no. 12)and Y (atomic no. 17).

Discussion

6969.	When an aluminium strip is kept immersed in freshly prepared ferrous sulphate solution taken in a test tube, the change which is observed is:(1) light green solution slowly turns colourless(2) the lower end of the test tube becomes slightly warm(3) a colourless gas with smell of burning sulphur is observed(4) light green solution changes to blue
Answer» When an aluminium strip is kept immersed in freshly prepared ferrous sulphate solution taken in a test tube, the change which is observed is: (1) light green solution slowly turns colourless (2) the lower end of the test tube becomes slightly warm (3) a colourless gas with smell of burning sulphur is observed (4) light green solution changes to blue

Discussion

6970.	How to make synthetic fibres
Answer» How to make synthetic fibres

Discussion

6971.	Give three points to differentiate between saturated and unsaturated hydrocarbons.
Answer» Give three points to differentiate between saturated and unsaturated hydrocarbons.

Discussion

6972.	29.the vapour density of a volatile chloride of divalent metal is 59.5 , find equivalent mass of the metal?
Answer» 29.the vapour density of a volatile chloride of divalent metal is 59.5 , find equivalent mass of the metal?

Discussion

6973.	In the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu2O with:
Answer» In the extraction of copper from its sulphide ore, the metal is formed by the reduction of $C u_{2} O$ with:

Discussion

6974.	The order of increasing acidic nature for SO2,SiO2,P2O3,Al2O3 is:
Answer» The order of increasing acidic nature for $S O_{2}, S i O_{2}, P_{2} O_{3}, A l_{2} O_{3}$ is:

Discussion

6975.	An inert gas having a duplet structure is __.
Answer» An inert gas having a duplet structure is __.

Discussion

6976.	X- 1s22s22p63s23p63d1 Y- 1s22s22p63s23p64s1 Which of the given electronic configuration is correct?
Answer» X- $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{1}$ Y- $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1}$ Which of the given electronic configuration is correct?

6976.

X- 1s22s22p63s23p63d1 Y- 1s22s22p63s23p64s1 Which of the given electronic configuration is correct?

Answer»

X- $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{1}$

Y- $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1}$

Which of the given electronic configuration is correct?

Discussion

6977.	{ IUPAC name of the compound }H_3C-CH-CH-CH_3 is }}{C_2H_5C_2H_5}{ (1) }2,3 -Diethylbutane }}{ (3) }2,3 -Dimethyloutane
Answer» { IUPAC name of the compound }H_3C-CH-CH-CH_3 is }}{C_2H_5C_2H_5}{ (1) }2,3 -Diethylbutane }}{ (3) }2,3 -Dimethyloutane

Discussion

6978.	Define hydrogen-oxygen fuel cell. Give some advantages of using it.
Answer» Define hydrogen-oxygen fuel cell. Give some advantages of using it.

Discussion

6979.	(a) What is an alkyl group? (b) Give the name of any three alkyl radicals. How are they formed? [3 MARKS]
Answer» (a) What is an alkyl group? (b) Give the name of any three alkyl radicals. How are they formed? [3 MARKS]

Discussion

6980.	Why silver articles become black after sometime when exposed to air?
Answer» Why silver articles become black after sometime when exposed to air?

Discussion

6981.	Where does HCl occur naturally as a gas?
Answer» Where does $H C l$ occur naturally as a gas?

Discussion

6982.	In case of Friedel Craft alkylation, polyalkylation takes place because
Answer» In case of Friedel Craft alkylation, polyalkylation takes place because

Discussion

6983.	Na + O2 → Y Y + H2O → Z The commercial name of Z is _________.
Answer» $N a$ + $O_{2}$ $\to$ $Y$ $Y$ + $H_{2} O$ $\to$ $Z$ The commercial name of Z is _________.

6983.

Na + O2 → Y Y + H2O → Z The commercial name of Z is _________.

Answer»

$N a$ + $O_{2}$ $\to$ $Y$

$Y$ + $H_{2} O$ $\to$ $Z$

The commercial name of Z is _________.

Discussion

6984.	Draw the structures for the following compounds.(i) Ethanoic acid (ii) Bromopentane(iii) Butanone (iv) HexanalAre structural isomers possible for bromopentane?
Answer» Draw the structures for the following compounds. (i) Ethanoic acid (ii) Bromopentane* (iii) Butanone (iv) Hexanal *Are structural isomers possible for bromopentane?

6984.

Draw the structures for the following compounds.(i) Ethanoic acid (ii) Bromopentane(iii) Butanone (iv) HexanalAre structural isomers possible for bromopentane?

Answer»

Draw the structures for the following compounds.

(i) Ethanoic acid (ii) Bromopentane*

(iii) Butanone (iv) Hexanal

*Are structural isomers possible for bromopentane?

Discussion

6985.	Why is equilibrium constant of hydrolysis (Kh) not effected by concentration of salt of weak acid weak base.
Answer» Why is equilibrium constant of hydrolysis (Kh) not effected by concentration of salt of weak acid weak base.

Discussion

6986.	Which of the following compounds will react with Tollen's reagent ?
Answer» Which of the following compounds will react with Tollen's reagent ?

Discussion

6987.	When magnesium oxide reacts with hydrochloric acid it forms:
Answer» When magnesium oxide reacts with hydrochloric acid it forms:

Discussion

6988.	a solution of MgCl2 in water has pH 1.7 3.7 4.14.2
Answer» a solution of MgCl2 in water has pH 1.<7 2.>7 3.7 4.14.2

Discussion

6989.	How to learn or keep in mind all the 118 elements in MODERN PERIODIC TABLE with their atomic masses and atomic no. Thank You Wasique Memon.
Answer» How to learn or keep in mind all the 118 elements in MODERN PERIODIC TABLE with their atomic masses and atomic no. Thank You Wasique Memon.

6989.

How to learn or keep in mind all the 118 elements in MODERN PERIODIC TABLE with their atomic masses and atomic no. Thank You Wasique Memon.

Answer»

How to learn or keep in mind all the 118 elements in MODERN

PERIODIC TABLE with their atomic masses and atomic no.

Thank You

Wasique Memon.

Discussion

6990.	(a) The diagram given below is to prepare iron (III) chloride in the laboratory:Figure(i) What is substance B?(ii) What is the purpose of B?(iii) Why is iron (III) chloride to be stored in a closed container?(iv) Write the equation for the reaction between iron and chloride.(b) Write the equation(s) for the reaction(s) to prepare lead sulphate from lead carbonate.
Answer» (a) The diagram given below is to prepare iron (III) chloride in the laboratory: Figure (i) What is substance B? (ii) What is the purpose of B? (iii) Why is iron (III) chloride to be stored in a closed container? (iv) Write the equation for the reaction between iron and chloride. (b) Write the equation(s) for the reaction(s) to prepare lead sulphate from lead carbonate.

Discussion

6991.	2Fe2O3.3H2O(s)Calcination−−−−−−−→A+3H2O(l) Find out A:
Answer» $2 {Fe}_{2} O_{3} . 3 H_{2} O(s) C a l c i n a t i o n - ------ \to A + 3 H_{2} O(l)$ Find out $A$ :

Discussion

6992.	13. Between NF3 and BF3 , which is more polar molecule?why?
Answer» 13. Between NF3 and BF3 , which is more polar molecule?why?

Discussion

6993.	Define glacial acetic acid.
Answer» Define glacial acetic acid.

Discussion

6994.	the no. of gm molucules of oxygen present in 13.5 g of SO2CL2 1. 0.1 2. 0.2 3 0.3 4 0.4
Answer» the no. of gm molucules of oxygen present in 13.5 g of SO2CL2 1. 0.1 2. 0.2 3 0.3 4 0.4

Discussion

6995.	What does the double line in the following cell represntation stand for? Mg(s)\|Mg2+(aq)\|\|Al3+(aq)\|Al(s)
Answer» What does the double line in the following cell represntation stand for? $M g (s) \| M g^{2 +} (a q) \| \| A l^{3 +} (a q) \| A l (s)$

Discussion

6996.	All living plants and animals need ________ for their growth as it is an important constituent of proteins.
Answer» All living plants and animals need ________ for their growth as it is an important constituent of proteins.

Discussion

6997.	Autotrophs are also known as __.
Answer» Autotrophs are also known as __.

Discussion

6998.	Taking hydrogen chloride and methane as examples, distinguish between a polar covalent bond and a non-polar covalent bond.
Answer» Taking hydrogen chloride and methane as examples, distinguish between a polar covalent bond and a non-polar covalent bond.

Discussion

6999.	Si unit of gravitatiom
Answer» Si unit of gravitatiom

Discussion

7000.	The variable coefficients d, e, f and g are considered for balancing the chemical equation. The relation we get by balancing the element H in the following equation is ____.
Answer» The variable coefficients d, e, f and g are considered for balancing the chemical equation. The relation we get by balancing the element H in the following equation is ____.

7000.

The variable coefficients d, e, f and g are considered for balancing the chemical equation. The relation we get by balancing the element H in the following equation is ____.

Answer»

The variable coefficients d, e, f and g are considered for balancing the chemical equation.

The relation we get by balancing the element H in the following equation is ____.

Discussion

Explore topic-wise InterviewSolutions in .

Mercury + sulphuric acid → No reaction. This is because of :-

how to calculate volume strength for any compounds?

The correct order of the atomic radii of C,Cs,Al and S is:

Sulphuric acid is also known as the "___".

When 1 mole of N, and 1 mole of H, is encosecin 3L vessel and the reaction is allowed to atair.equilibrium, it is found that at equilibrium theremole of H The number of moles of NH, formewould be21+x)(2)32x(1)(1-x)(4)(3)A212

How copper can be reduced by coke in extraction

2 bromo pentane is heated with EtO-Na+ in ethanol the major product obtained is

What do you mean by chemical reaction?

19. What will happen when CH3CH2OH reacts with concentrated Sulphuric acid at 180 C

Non metallic oxides are:

30. Which carbocation is more stable - benzyl or tertiary?

If mole fraction of urea in aqueous solution is 0.1 then mass percentage of urea in the solution will be (molar mass of urea = 60 g mol–1)

25. For dilute solutions is molarity equal to molality of the solution. Why why not

a gas in a cylinder is held at a cons†an t pressure 1.7×10^5 Pa and is cooled and compressed from 1.20m^3 to 0.8m^3. The internal energy of the gas decreases by 1.1×10^5J. (a) does it matter whether or not the gas is ideal. if no then why not ?

an oxide of metal have 20 pecentage oxygen the equivalent weight of oxide is

When an acid produces H+ ions in solution does that mean that they lose their acidity?? Is the process of releasing H+ ions related to dilution??

A. Why AgBr stored in dark coloured bottles. B. Write electron dot structure for the compound formed between X (atomic no. 12)and Y (atomic no. 17).

How to make synthetic fibres

Give three points to differentiate between saturated and unsaturated hydrocarbons.

29.the vapour density of a volatile chloride of divalent metal is 59.5 , find equivalent mass of the metal?

In the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu2O with:

The order of increasing acidic nature for SO2,SiO2,P2O3,Al2O3 is:

An inert gas having a duplet structure is __.

X- 1s22s22p63s23p63d1 Y- 1s22s22p63s23p64s1 Which of the given electronic configuration is correct?

{ IUPAC name of the compound }H_3C-CH-CH-CH_3 is }}{C_2H_5C_2H_5}{ (1) }2,3 -Diethylbutane }}{ (3) }2,3 -Dimethyloutane

Define hydrogen-oxygen fuel cell. Give some advantages of using it.

(a) What is an alkyl group? (b) Give the name of any three alkyl radicals. How are they formed? [3 MARKS]

Why silver articles become black after sometime when exposed to air?

Where does HCl occur naturally as a gas?

In case of Friedel Craft alkylation, polyalkylation takes place because

Na + O2 → Y Y + H2O → Z The commercial name of Z is _________.

Draw the structures for the following compounds.(i) Ethanoic acid (ii) Bromopentane*(iii) Butanone (iv) Hexanal*Are structural isomers possible for bromopentane?

Why is equilibrium constant of hydrolysis (Kh) not effected by concentration of salt of weak acid weak base.

Which of the following compounds will react with Tollen's reagent ?

When magnesium oxide reacts with hydrochloric acid it forms:

a solution of MgCl2 in water has pH 1.7 3.7 4.14.2

How to learn or keep in mind all the 118 elements in MODERN PERIODIC TABLE with their atomic masses and atomic no. Thank You Wasique Memon.

2Fe2O3.3H2O(s)Calcination−−−−−−−→A+3H2O(l) Find out A:

13. Between NF3 and BF3 , which is more polar molecule?why?

Define glacial acetic acid.

the no. of gm molucules of oxygen present in 13.5 g of SO2CL2 1. 0.1 2. 0.2 3 0.3 4 0.4

What does the double line in the following cell represntation stand for? Mg(s)|Mg2+(aq)||Al3+(aq)|Al(s)

All living plants and animals need ________ for their growth as it is an important constituent of proteins.

Autotrophs are also known as __.

Taking hydrogen chloride and methane as examples, distinguish between a polar covalent bond and a non-polar covalent bond.

Si unit of gravitatiom

The variable coefficients d, e, f and g are considered for balancing the chemical equation. The relation we get by balancing the element H in the following equation is ____.

Draw the structures for the following compounds.(i) Ethanoic acid (ii) Bromopentane(iii) Butanone (iv) HexanalAre structural isomers possible for bromopentane?