15280 + Interview Questions in Chemistry Page 79 InterviewSolution

3901.	Formula for displacement
Answer» Formula for displacement

Discussion

3902.	13. From separate solutions of four sodium salts NaW, NaX, NaY and NaZ and pH 7.0, 9.0, 10.0 and 11.0 respectively. When each solution was 0.1M, the strongest acid is :- Options: 1. HW 2. HX 3. HY 4. HZ
Answer» 13. From separate solutions of four sodium salts NaW, NaX, NaY and NaZ and pH 7.0, 9.0, 10.0 and 11.0 respectively. When each solution was 0.1M, the strongest acid is :- Options: 1. HW 2. HX 3. HY 4. HZ

Discussion

3903.	If we give the number of half lives. Then how to calculate remaining percentage of reactants give detail explanation
Answer» If we give the number of half lives. Then how to calculate remaining percentage of reactants give detail explanation

Discussion

3904.	Identify the oxidising agent in the given chemical reaction.2Fe2O3 (s)+3C (s)→4Fe (s)+3CO2(g)
Answer» Identify the oxidising agent in the given chemical reaction. $2 {Fe}_{2} O_{3} (s) + 3 C (s) \to 4 Fe (s) + 3 {CO}_{2} (g)$

Discussion

3905.	A straight-chain alkane 'A' is formed out of 10 carbon atoms. How many hydrogens will be there in that molecule?
Answer» A straight-chain alkane 'A' is formed out of 10 carbon atoms. How many hydrogens will be there in that molecule?

Discussion

3906.	What will be the longest wavelength line in Balmer series of spectrum of H-atom
Answer» What will be the longest wavelength line in Balmer series of spectrum of H-atom

Discussion

3907.	What do you observe when ammonia gas is bubbled through red litmus solution?
Answer» What do you observe when ammonia gas is bubbled through red litmus solution?

Discussion

3908.	Which of the following statement is correct in regard to the classification of elements?
Answer» Which of the following statement is correct in regard to the classification of elements?

Discussion

3909.	Find the odd-man-out.(a) salt, vinegar, citric acid, sodium benzoate(b) lakhi dal, brick dust, metanyl yellow, turmeric powder(c) banana, apple, guava, almond(d) storing, freezing, settling, drying
Answer» Find the odd-man-out. (a) salt, vinegar, citric acid, sodium benzoate (b) lakhi dal, brick dust, metanyl yellow, turmeric powder (c) banana, apple, guava, almond (d) storing, freezing, settling, drying

Discussion

3910.	Identify the functional group present in the following compounds
Answer» Identify the functional group present in the following compounds

Discussion

3911.	H2O (g) + C -> CO+ H2 Steam reacts with red hot charcoal to form hydrogen gas& carbon monoxide.My question is why doesn't it form carbon dioxide?
Answer» H2O (g) + C -> CO+ H2 Steam reacts with red hot charcoal to form hydrogen gas& carbon monoxide.My question is why doesn't it form carbon dioxide?

3911.

H2O (g) + C -> CO+ H2 Steam reacts with red hot charcoal to form hydrogen gas& carbon monoxide.My question is why doesn't it form carbon dioxide?

Answer»

H2O (g) + C -> CO+ H2

Steam reacts with red hot charcoal to form hydrogen gas& carbon monoxide.My question is why doesn't it form carbon dioxide?

Discussion

3912.

Copy and complete the following table: Sodium Phosphorous Formula of chloride Physical state of chloride at room temperature (i.e., solid, liquid or gas) Nature of bonding in chloride (i.e., ionic or covalent)

Answer» Copy and complete the following table:

	Sodium	Phosphorous
Formula of chloride
Physical state of chloride at room temperature (i.e., solid, liquid or gas)
Nature of bonding in chloride (i.e., ionic or covalent)

Discussion

3913.	___ is mixed with air or oxygen to be used for welding for cutting metals.
Answer» ___ is mixed with air or oxygen to be used for welding for cutting metals.

Discussion

3914.	What would you observe in the following cases?(i) Sulphur trioxide is dissolved in water on a large scale.(ii) Concentrated sulphuric acid is added to equal volumes of cold water.(iii) 100 ml of 98% sulphuric acid is kept open.(iv) Hot concentrated sulphuric acid is added to sodium chloride crystals.(v) Dilute sulphuric acid is added to ferrous sulphate solution.
Answer» What would you observe in the following cases? (i) Sulphur trioxide is dissolved in water on a large scale. (ii) Concentrated sulphuric acid is added to equal volumes of cold water. (iii) 100 ml of 98% sulphuric acid is kept open. (iv) Hot concentrated sulphuric acid is added to sodium chloride crystals. (v) Dilute sulphuric acid is added to ferrous sulphate solution.

Discussion

3915.	One of the following is not an organic acid. This is : (a) ethanoic acid (b) formic acid (c) citric acid (d) carbonic acid
Answer» One of the following is not an organic acid. This is : (a) ethanoic acid (b) formic acid (c) citric acid (d) carbonic acid

3915.

One of the following is not an organic acid. This is : (a) ethanoic acid (b) formic acid (c) citric acid (d) carbonic acid

Answer»

One of the following is not an organic acid. This is :

(a) ethanoic acid

(b) formic acid

(c) citric acid

(d) carbonic acid

Discussion

3916.	Elements x, y and z forms Dobereiner's triad. If the atomic mass of element x and z are 7 and 39 respectively, then what is the atomic mass of element y?
Answer» Elements x, y and z forms Dobereiner's triad. If the atomic mass of element x and z are $7$ and $39$ respectively, then what is the atomic mass of element y?

Discussion

3917.	What is the valency of vanadium,manganese,iron,cobalt,copper
Answer» What is the valency of vanadium,manganese,iron,cobalt,copper

Discussion

3918.	The following compounds are non-polar except _______.
Answer» The following compounds are non-polar except _______.

Discussion

3919.	10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HCl. If we take 20 mL of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralise it will be:
Answer» $10 mL$ of a solution of $N a O H$ is found to be completely neutralised by $8 mL$ of a given solution of $H C l$ . If we take $20 mL$ of the same solution of $N a O H$ , the amount of $H C l$ solution (the same solution as before) required to neutralise it will be:

Discussion

3920.	40. The no. Of gram atoms present in 10 gms of CaCO3 is _______
Answer» 40. The no. Of gram atoms present in 10 gms of CaCO3 is _______

Discussion

3921.	(a) What is a period in a periodic table? How do atomic structures (electron arrangements) change in a period with the increase in atomic numbers from left to right? (b) How do the following change on going from left to right in a period of the periodic table? (i) Chemical reactivity of elements (ii) Nature of oxides of elements Give examples in support of your answer.
Answer» (a) What is a period in a periodic table? How do atomic structures (electron arrangements) change in a period with the increase in atomic numbers from left to right? (b) How do the following change on going from left to right in a period of the periodic table? (i) Chemical reactivity of elements (ii) Nature of oxides of elements Give examples in support of your answer.

3921.

(a) What is a period in a periodic table? How do atomic structures (electron arrangements) change in a period with the increase in atomic numbers from left to right? (b) How do the following change on going from left to right in a period of the periodic table? (i) Chemical reactivity of elements (ii) Nature of oxides of elements Give examples in support of your answer.

Answer»

(a) What is a period in a periodic table? How do atomic structures (electron arrangements) change in a period with the increase in atomic numbers from left to right?

(b) How do the following change on going from left to right in a period of the periodic table?

(i) Chemical reactivity of elements (ii) Nature of oxides of elements

Give examples in support of your answer.

Discussion

3922.	BHC is a pesticide or not?2,4,5-1 us what?
Answer» BHC is a pesticide or not? 2,4,5-1 us what?

Discussion

3923.	Which of the following correctly represents 360 g of water?
Answer» Which of the following correctly represents 360 g of water?

Discussion

3924.	Calculate the amount of ice formed when a copper ball of mass 500 g, dipped in liquid nitrogen at -1960C, is placed in a bucket of water at 00C. [c of copper = 0.4 Jg-1C-1]
Answer» Calculate the amount of ice formed when a copper ball of mass 500 g, dipped in liquid nitrogen at -196⁰C, is placed in a bucket of water at 0⁰C. [c of copper = 0.4 Jg^-1C^-1]

Discussion

3925.	A certain radio station broadcasts on a frequency of 1890 kHz. Calculate the wavelength of the electromagnetic radiation?
Answer» A certain radio station broadcasts on a frequency of $1890 kHz$ . Calculate the wavelength of the electromagnetic radiation?

Discussion

3926.	Which of the following reaction will not occur during the substitution reaction of methane with chlorine to form carbon tetrachloride?
Answer» Which of the following reaction will not occur during the substitution reaction of methane with chlorine to form carbon tetrachloride?

Discussion

3927.	If the pressure of nitrogen and hydrogen in mixture of closed apparatus is 100atm and 20% of mixture reacts then the pressure at same temperature would be
Answer» If the pressure of nitrogen and hydrogen in mixture of closed apparatus is 100atm and 20% of mixture reacts then the pressure at same temperature would be

Discussion

3928.	Wat is sub shell
Answer» Wat is sub shell

Discussion

3929.	Although phenoxide ion has more number of resonating structures thancarboxylate ion, carboxylic acid is a stronger acid than phenol. Why?
Answer» Although phenoxide ion has more number of resonating structures than carboxylate ion, carboxylic acid is a stronger acid than phenol. Why?

Discussion

3930.	Q11:- What are active elements?
Answer» Q11:- What are active elements?

Discussion

3931.	Element X is a metal with a valency 2. Element Y is a non-metal with a valency 3.(a) Write equations to show how X and Y form ions.(b) If Y is a diatomic gas, write the equation for the direct combination of X and Y to form a compound.(c) Write two applications of electrolysis in which the anode diminishes in mass.(d) If the compound formed between X and Y is melted and an electric current passed through the molten compound, the element X will be obtained at the _________ and Y at the __________ of the electrolytic cell. (Provide the missing words).
Answer» Element X is a metal with a valency 2. Element Y is a non-metal with a valency 3. (a) Write equations to show how X and Y form ions. (b) If Y is a diatomic gas, write the equation for the direct combination of X and Y to form a compound. (c) Write two applications of electrolysis in which the anode diminishes in mass. (d) If the compound formed between X and Y is melted and an electric current passed through the molten compound, the element X will be obtained at the _________ and Y at the __________ of the electrolytic cell. (Provide the missing words).

Discussion

3932.	How to fill the electronic configuration of lanthanum?
Answer» How to fill the electronic configuration of lanthanum?

Discussion

3933.	With reference to butane, explain the following terms:(i) Molecular formula(ii) Structural formula(iii) Condensed formula
Answer» With reference to butane, explain the following terms: (i) Molecular formula (ii) Structural formula (iii) Condensed formula

Discussion

3934.	Question 2 Butanone is a four-carbon compound with the functional group: (a) Carboxylic acid (b) Aldehyde (c) Ketone (d) Alcohol
Answer» Question 2 Butanone is a four-carbon compound with the functional group: (a) Carboxylic acid (b) Aldehyde (c) Ketone (d) Alcohol

Discussion

3935.	Differentiate between molecular mass and formula unit mass.
Answer» Differentiate between molecular mass and formula unit mass.

Discussion

3936.	Why does the colour of copper sulphate solution change when an iron nail is kept immersed in it ?
Answer» Why does the colour of copper sulphate solution change when an iron nail is kept immersed in it ?

Discussion

3937.	The atomic radius in case of inert gases is?
Answer» The atomic radius in case of inert gases is?

Discussion

3938.	Q 19/38 What will be the heat of formation of ethane,if the heat of combustion of carbon is -x kJ, heat offormation of water is-y kJ and heat liberated duringcombustion of ethane is z kJ/mol?
Answer» Q 19/38 What will be the heat of formation of ethane,if the heat of combustion of carbon is -x kJ, heat offormation of water is-y kJ and heat liberated duringcombustion of ethane is z kJ/mol?

Discussion

3939.	Limestone is a common type of carbonate rock.
Answer» Limestone is a common type of carbonate rock.

Discussion

3940.	compare masses of pure NaOH in each of the aqueous solution 1)50g of 40%(w/w)NaOH 2) 50mL of 50% (w/v) NaOH (d=1.25/mL)
Answer» compare masses of pure NaOH in each of the aqueous solution 1)50g of 40%(w/w)NaOH 2) 50mL of 50% (w/v) NaOH (d=1.25/mL)

Discussion

3941.	(a) How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?(b) Name any two active metals which can be used with hydrochloric acid to liberate the same gas.
Answer» (a) How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal? (b) Name any two active metals which can be used with hydrochloric acid to liberate the same gas.

Discussion

3942.	9.Find out the mass by volume percentage of 15 % ( w/w) solution of sulphuric acid having density = 1.02 g/ml
Answer» 9.Find out the mass by volume percentage of 15 % ( w/w) solution of sulphuric acid having density = 1.02 g/ml

Discussion

3943.	What happens when O2 molecule is formed?
Answer» What happens when $O_{2}$ molecule is formed?

Discussion

3944.	Name two metals that do not react with oxygen even at high temperatures.
Answer» Name two metals that do not react with oxygen even at high temperatures.

Discussion

3945.	Na has completely filled K and L shells. Explain.
Answer» Na has completely filled K and L shells. Explain.

Discussion

3946.	Name some alkali metals. How many electron do they have in their outermost orbit?
Answer» Name some alkali metals. How many electron do they have in their outermost orbit?

Discussion

3947.	4.What will be the number of water molecule present in 1 ml of H2O l at NTP ,considering density 1gm/mL.
Answer» 4.What will be the number of water molecule present in 1 ml of H2O l at NTP ,considering density 1gm/mL.

Discussion

3948.	the number of second nearest neighbour in cesium chloride is
Answer» the number of second nearest neighbour in cesium chloride is

Discussion

3949.	Why are organic compounds easily flammable?
Answer» Why are organic compounds easily flammable?

Discussion

3950.

What do you mean by reactivity series? Arrange the following metals in the decreasing order of their reactivity with acids.Aluminium, Iron, Copper, Sodium, Silver.

Answer»

What do you mean by reactivity series? Arrange the following metals in the decreasing order of their reactivity with acids.

Aluminium, Iron, Copper, Sodium, Silver.

Discussion

Explore topic-wise InterviewSolutions in .

Formula for displacement

13. From separate solutions of four sodium salts NaW, NaX, NaY and NaZ and pH 7.0, 9.0, 10.0 and 11.0 respectively. When each solution was 0.1M, the strongest acid is :- Options: 1. HW 2. HX 3. HY 4. HZ

If we give the number of half lives. Then how to calculate remaining percentage of reactants give detail explanation

Identify the oxidising agent in the given chemical reaction.2Fe2O3 (s)+3C (s)→4Fe (s)+3CO2(g)

A straight-chain alkane 'A' is formed out of 10 carbon atoms. How many hydrogens will be there in that molecule?

What will be the longest wavelength line in Balmer series of spectrum of H-atom

What do you observe when ammonia gas is bubbled through red litmus solution?

Which of the following statement is correct in regard to the classification of elements?

Find the odd-man-out.(a) salt, vinegar, citric acid, sodium benzoate(b) lakhi dal, brick dust, metanyl yellow, turmeric powder(c) banana, apple, guava, almond(d) storing, freezing, settling, drying

Identify the functional group present in the following compounds

H2O (g) + C -&gt; CO+ H2 Steam reacts with red hot charcoal to form hydrogen gas&amp; carbon monoxide.My question is why doesn't it form carbon dioxide?

Copy and complete the following table: Sodium Phosphorous Formula of chloride Physical state of chloride at room temperature (i.e., solid, liquid or gas) Nature of bonding in chloride (i.e., ionic or covalent)

___ is mixed with air or oxygen to be used for welding for cutting metals.

One of the following is not an organic acid. This is : (a) ethanoic acid (b) formic acid (c) citric acid (d) carbonic acid

Elements x, y and z forms Dobereiner's triad. If the atomic mass of element x and z are 7 and 39 respectively, then what is the atomic mass of element y?

What is the valency of vanadium,manganese,iron,cobalt,copper

The following compounds are non-polar except _______.

10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HCl. If we take 20 mL of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralise it will be:

40. The no. Of gram atoms present in 10 gms of CaCO3 is _______

BHC is a pesticide or not?2,4,5-1 us what?

Which of the following correctly represents 360 g of water?

Calculate the amount of ice formed when a copper ball of mass 500 g, dipped in liquid nitrogen at -1960C, is placed in a bucket of water at 00C. [c of copper = 0.4 Jg-1C-1]

A certain radio station broadcasts on a frequency of 1890 kHz. Calculate the wavelength of the electromagnetic radiation?

Which of the following reaction will not occur during the substitution reaction of methane with chlorine to form carbon tetrachloride?

If the pressure of nitrogen and hydrogen in mixture of closed apparatus is 100atm and 20% of mixture reacts then the pressure at same temperature would be

Wat is sub shell

Although phenoxide ion has more number of resonating structures thancarboxylate ion, carboxylic acid is a stronger acid than phenol. Why?

Q11:- What are active elements?

How to fill the electronic configuration of lanthanum?

With reference to butane, explain the following terms:(i) Molecular formula(ii) Structural formula(iii) Condensed formula

Question 2 Butanone is a four-carbon compound with the functional group: (a) Carboxylic acid (b) Aldehyde (c) Ketone (d) Alcohol

Differentiate between molecular mass and formula unit mass.

Why does the colour of copper sulphate solution change when an iron nail is kept immersed in it ?

The atomic radius in case of inert gases is?

Q 19/38 What will be the heat of formation of ethane,if the heat of combustion of carbon is -x kJ, heat offormation of water is-y kJ and heat liberated duringcombustion of ethane is z kJ/mol?

Limestone is a common type of carbonate rock.

compare masses of pure NaOH in each of the aqueous solution 1)50g of 40%(w/w)NaOH 2) 50mL of 50% (w/v) NaOH (d=1.25/mL)

(a) How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?​(b) Name any two active metals which can be used with hydrochloric acid to liberate the same gas.

9.Find out the mass by volume percentage of 15 % ( w/w) solution of sulphuric acid having density = 1.02 g/ml

What happens when O2 molecule is formed?

Name two metals that do not react with oxygen even at high temperatures.

Na has completely filled K and L shells. Explain.

Name some alkali metals. How many electron do they have in their outermost orbit?

4.What will be the number of water molecule present in 1 ml of H2O l at NTP ,considering density 1gm/mL.

the number of second nearest neighbour in cesium chloride is

Why are organic compounds easily flammable?

What do you mean by reactivity series? Arrange the following metals in the decreasing order of their reactivity with acids.Aluminium, Iron, Copper, Sodium, Silver.

H2O (g) + C -> CO+ H2 Steam reacts with red hot charcoal to form hydrogen gas& carbon monoxide.My question is why doesn't it form carbon dioxide?

(a) How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?(b) Name any two active metals which can be used with hydrochloric acid to liberate the same gas.