15280 + Interview Questions in Chemistry Page 132 InterviewSolution

6551.	20. X + conc. H2SO4 + K2Cr2O7 -------------> red brown vapours. X can be (1) NaCl (2) NaBr (3) both (1) and (2) (4) none of these
Answer» 20. X + conc. H2SO4 + K2Cr2O7 -------------> red brown vapours. X can be (1) NaCl (2) NaBr (3) both (1) and (2) (4) none of these

Discussion

6552.	CaO + H2O → Ca(OH)2 is an example of a:
Answer» CaO + H₂O → Ca(OH)₂ is an example of a:

Discussion

6553.	CaO does not react with 1) SiO2 2) P4O10 3) CO2 4) Mg
Answer» CaO does not react with 1) SiO2 2) P4O10 3) CO2 4) Mg

Discussion

6554.	What is denatured alcohol ?
Answer» What is denatured alcohol ?

Discussion

6555.	The t12 of first order reaction is 60 min. What will be % of substance left after 240 min?
Answer» The $t \frac{1}{2}$ of first order reaction is 60 min. What will be $%$ of substance left after 240 min?

Discussion

6556.	The questions (i) to (v) refer to the following salt solutions listed (a) to (f):(a) Copper nitrate(b) Iron (II) sulphate(c) Iron (III) chloride(d) Lead nitrate(e) Magnesium sulphate(f) Zinc chloride(i) Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?(ii) Which two solution will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?(iii) Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it?(iv) Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it?(v) Which solution gives a white precipitate with excess ammonium hydroxide solution?
Answer» The questions (i) to (v) refer to the following salt solutions listed (a) to (f): (a) Copper nitrate (b) Iron (II) sulphate (c) Iron (III) chloride (d) Lead nitrate (e) Magnesium sulphate (f) Zinc chloride (i) Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution? (ii) Which two solution will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution? (iii) Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it? (iv) Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it? (v) Which solution gives a white precipitate with excess ammonium hydroxide solution?

Discussion

6557.	what would happen to NO3^- ions in electroplating of silver
Answer» what would happen to NO3^- ions in electroplating of silver

Discussion

6558.	Choose the word or phrase from the brackets which correctly completes each of the following statements:- (a) The element below sodium in the same group would be expected to have a ........... (lower/higher) electro-negativity than sodium and the element above chlorine would be expected to have a ............. (lower/higher) ionization potential than chlorine. (b) On moving from left to right in a given period, the number of shells ...... (remains the same/ increases decreases). (c) On moving down a group, the number of valence electrons ....... (remains the same/increases/decreases). (d) Metals are good ............. (oxidising agent/ reducing agent) because they are electron.......... (acceptors/donors).
Answer» Choose the word or phrase from the brackets which correctly completes each of the following statements:- (a) The element below sodium in the same group would be expected to have a ........... (lower/higher) electro-negativity than sodium and the element above chlorine would be expected to have a ............. (lower/higher) ionization potential than chlorine. (b) On moving from left to right in a given period, the number of shells ...... (remains the same/ increases decreases). (c) On moving down a group, the number of valence electrons ....... (remains the same/increases/decreases). (d) Metals are good ............. (oxidising agent/ reducing agent) because they are electron.......... (acceptors/donors).

6558.

Choose the word or phrase from the brackets which correctly completes each of the following statements:- (a) The element below sodium in the same group would be expected to have a ........... (lower/higher) electro-negativity than sodium and the element above chlorine would be expected to have a ............. (lower/higher) ionization potential than chlorine. (b) On moving from left to right in a given period, the number of shells ...... (remains the same/ increases decreases). (c) On moving down a group, the number of valence electrons ....... (remains the same/increases/decreases). (d) Metals are good ............. (oxidising agent/ reducing agent) because they are electron.......... (acceptors/donors).

Answer»

Choose the word or phrase from the brackets which correctly completes each of the following statements:-

(a) The element below sodium in the same group would be expected to have a ........... (lower/higher) electro-negativity than sodium and the element above chlorine would be expected to have a ............. (lower/higher) ionization potential than chlorine.

(b) On moving from left to right in a given period, the number of shells ...... (remains the same/ increases decreases).

(c) On moving down a group, the number of valence electrons ....... (remains the same/increases/decreases).

(d) Metals are good ............. (oxidising agent/ reducing agent) because they are electron.......... (acceptors/donors).

Discussion

6559.	Iodoform can be prepared from all except
Answer» Iodoform can be prepared from all except

Discussion

6560.	Name the experiment illustrated above.Which property of hydrogen chloride is demonstrated by this experiment?
Answer» Name the experiment illustrated above. Which property of hydrogen chloride is demonstrated by this experiment?

Discussion

6561.	Convert 0.1 .molesof aqueous H2SO4 into mass/volume percentage
Answer» Convert 0.1 .molesof aqueous H2SO4 into mass/volume percentage

Discussion

6562.	N phenyl hydroxylamine is obtained when nitro benzene is reacted with SN/HCl Zn/NH4ClAs2O3/NaOH Zn/NaOH
Answer» N phenyl hydroxylamine is obtained when nitro benzene is reacted with SN/HCl Zn/NH4Cl As2O3/NaOH Zn/NaOH

Discussion

6563.	On the passage of excess of Ammonia, colourless Nessler's reagent solution changes its colour to ___ .
Answer» On the passage of excess of Ammonia, colourless Nessler's reagent solution changes its colour to ___ .

Discussion

6564.	Identify the functional group present in the following compound and name it according to IUPAC system : CH3OH
Answer» Identify the functional group present in the following compound and name it according to IUPAC system : $C H_{3} O H$

Discussion

6565.	State which of the two — a solution of HCl in water or in toluene is an electrolyte. Explain.
Answer» State which of the two — a solution of HCl in water or in toluene is an electrolyte. Explain.

Discussion

6566.	The ratio of the energy of a photon of 2000 Å wavelength radiation to that of 4000 Å radiation is:
Answer» The ratio of the energy of a photon of 2000 Å wavelength radiation to that of 4000 Å radiation is:

Discussion

6567.	According to modern periodic table, the properties of elements are a periodic function of their:
Answer» According to modern periodic table, the properties of elements are a periodic function of their:

Discussion

6568.	The salt which will give a neutral solution on dissolving in water will be : (a) CH3COONa (b) NH4Cl (c) KCl (d) Na2CO3
Answer» The salt which will give a neutral solution on dissolving in water will be : (a) $C H_{3} C O O N a$ (b) $N H_{4} C l$ (c) $K C l$ (d) $N a_{2} C O_{3}$

6568.

The salt which will give a neutral solution on dissolving in water will be : (a) CH3COONa (b) NH4Cl (c) KCl (d) Na2CO3

Answer»

The salt which will give a neutral solution on dissolving in water will be :

(a) $C H_{3} C O O N a$

(b) $N H_{4} C l$

(c) $K C l$

(d) $N a_{2} C O_{3}$

Discussion

6569.	Write the balanced chemical equation for the combustion of Zn?
Answer» Write the balanced chemical equation for the combustion of Zn?

Discussion

6570.	Complete and balance the following equation: Cu + HNO3 → NO2 + ........ + ........
Answer» Complete and balance the following equation: Cu + HNO₃ $\overset{}{\to}$ NO₂ + ........ + ........

Discussion

6571.	give two uses of washing soda and baking soda.
Answer» give two uses of washing soda and baking soda.

Discussion

6572.	Two bottles A and B contain 2M and 2m aquous solutions of H2SO4 respectively ,then ( d= 1g/mL) 1 ) A is more concentrated than B 2) B is more concentrated than A 3) concentaration of A and B are equal 4) impossible to say .?
Answer» Two bottles A and B contain 2M and 2m aquous solutions of H2SO4 respectively ,then ( d= 1g/mL) 1 ) A is more concentrated than B 2) B is more concentrated than A 3) concentaration of A and B are equal 4) impossible to say .?

Discussion

6573.	When acid reacts with base salt is formed. But when an acidic substance reacts with another acidic substance, is an insoluble salt or precipitate formed?Because it is written that CuSO4 acidified with dilute HCl reacts with hydrogen sulphide gas (acidic in nature) to produce a precipitate called CuS.
Answer» When acid reacts with base salt is formed. But when an acidic substance reacts with another acidic substance, is an insoluble salt or precipitate formed? Because it is written that CuSO4 acidified with dilute HCl reacts with hydrogen sulphide gas (acidic in nature) to produce a precipitate called CuS.

Discussion

6574.	what is wrong with the following chemical equation ? Mg + O ⟶ MgO Correct ana balance it
Answer» what is wrong with the following chemical equation ? Mg + O $⟶$ MgO Correct ana balance it

6574.

what is wrong with the following chemical equation ? Mg + O ⟶ MgO Correct ana balance it

Answer»

what is wrong with the following chemical equation ?

Mg + O $⟶$ MgO

Correct ana balance it

Discussion

6575.	Select the statements that are true.
Answer» Select the statements that are true.

Discussion

6576.	Question 35.What happens when nitric acid is added to egg shell ?
Answer» Question 35. What happens when nitric acid is added to egg shell ?

Discussion

6577.	The heat of combustion of yellow phosphorous & red phosphorous are - 9.91 KJ and - 8.78 KJ respectively. The heat of transition of yellow phosphorous to red phosphorous is:
Answer» The heat of combustion of yellow phosphorous & red phosphorous are - 9.91 KJ and - 8.78 KJ respectively. The heat of transition of yellow phosphorous to red phosphorous is:

Discussion

6578.	Fill in the blanks with suitable words:An acid is a compound which when dissolved in water forms hydronium ions as the only _______ ions. A base is a compound which if soluble in water contains _________ ions. A base reacts with an acid to form ________ and water only. This type of reaction is known as ________.
Answer» Fill in the blanks with suitable words: An acid is a compound which when dissolved in water forms hydronium ions as the only _______ ions. A base is a compound which if soluble in water contains _________ ions. A base reacts with an acid to form ________ and water only. This type of reaction is known as ________.

Discussion

6579.	Choose the correct option:
Answer» Choose the correct option:

Discussion

6580.	(b) Give the IUPAC names of the following compounds:11_Page298_Figure_Frank_Chemistry_PartII
Answer» (b) Give the IUPAC names of the following compounds: 11_Page298_Figure_Frank_Chemistry_PartII

Discussion

6581.	why iodine is not mentioned in newland table as it was discovered in1811?
Answer» why iodine is not mentioned in newland table as it was discovered in1811?

Discussion

6582.	For what angle between A and B , [ A+ B ] = [ A-B ] explain in proper way with full of explanation ?
Answer» For what angle between A and B , [ A+ B ] = [ A-B ] explain in proper way with full of explanation ?

Discussion

6583.	Give atleast 3 structural differences between an artery and a vein
Answer» Give atleast 3 structural differences between an artery and a vein

Discussion

6584.	(a) Name two metals which are found in free state in nature.(b) What chemical process is used for extracting a metal from its oxide ore? Name one metal which is extracted by this method.(c) Describe the extraction of zinc metal from its sulphide ore as well as its carbonate ore. Write equations of all the reactions involved.
Answer» (a) Name two metals which are found in free state in nature. (b) What chemical process is used for extracting a metal from its oxide ore? Name one metal which is extracted by this method. (c) Describe the extraction of zinc metal from its sulphide ore as well as its carbonate ore. Write equations of all the reactions involved.

Discussion

6585.	What do you mean by water of crystallisation of a substance?
Answer» What do you mean by water of crystallisation of a substance?

Discussion

6586.	(a) Write the formula of the functional group present in carboxylic acids. (b) Name the functional group present in CH3−C≡CH. (c) Name the functional groups present in the following compounds : (i) CH3−CHO (ii) CH3−CH2−COOH (iii) CH3−O\|\|C−CH3 (iv) CH3−CH2−CH2−OH
Answer» (a) Write the formula of the functional group present in carboxylic acids. (b) Name the functional group present in $C H_{3} - C \equiv C H .$ (c) Name the functional groups present in the following compounds : (i) $C H_{3} - C H O$ (ii) $C H_{3} - C H_{2} - C O O H$ (iii) $C H_{3} - O \| \| C - C H_{3}$ (iv) $C H_{3} - C H_{2} - C H_{2} - O H$

Discussion

6587.	Number of chain isomers of C6H14 is:
Answer» Number of chain isomers of $C_{6} H_{14}$ is:

Discussion

6588.	Answer the following questions:(i) Name a metal which is found abundantly in the earth's crust.(ii) What is the difference between calcination and roasting?(iii) Name the process used for the enrichment of sulphide ore.(iv) Write the chemical formulae of one main ore of iron and aluminium.(v) Write the constituents of electrolyte for the extraction of aluminium.
Answer» Answer the following questions: (i) Name a metal which is found abundantly in the earth's crust. (ii) What is the difference between calcination and roasting? (iii) Name the process used for the enrichment of sulphide ore. (iv) Write the chemical formulae of one main ore of iron and aluminium. (v) Write the constituents of electrolyte for the extraction of aluminium.

Discussion

6589.	In a given atom no two electrons can have the same values for all the four quantum numbers. This is due to:
Answer» In a given atom no two electrons can have the same values for all the four quantum numbers. This is due to:

Discussion

6590.	How to use equilibrium constant K, in different problems
Answer» How to use equilibrium constant K, in different problems

Discussion

6591.	Which has higher PH value, 1M HCL or 1M naoh solution?
Answer» Which has higher PH value, 1M HCL or 1M naoh solution?

Discussion

6592.	Which one is the correct summary equation of nitrogen fixation ?
Answer» Which one is the correct summary equation of nitrogen fixation ?

Discussion

6593.	Which of these has higher concentration of H+ ions.. 1M of HCl OR 1M of CH3COOH
Answer» Which of these has higher concentration of H⁺ ions.. 1M of HCl OR 1M of CH₃COOH

6593.

Which of these has higher concentration of H+ ions.. 1M of HCl OR 1M of CH3COOH

Answer»

Which of these has higher concentration of H⁺ ions..

1M of HCl OR 1M of CH₃COOH

Discussion

6594.	Which of the following are mineral acids?
Answer» Which of the following are mineral acids?

Discussion

6595.	13.Why in real gas equation the volume mentioned is the free space available in the container hy subtracting the voljme of gas as (V-nb) but the volime taken should be of gas not the empty volume
Answer» 13.Why in real gas equation the volume mentioned is the free space available in the container hy subtracting the voljme of gas as (V-nb) but the volime taken should be of gas not the empty volume

Discussion

6596.	At 300K the density of a certain gaseous molecule at 2 bar is double to that of dinitrogen at 4 bar .The molar mass of gaseous molecule is:
Answer» At 300K the density of a certain gaseous molecule at 2 bar is double to that of dinitrogen at 4 bar .The molar mass of gaseous molecule is:

Discussion

6597.	Assertion – In froth flotation process sodium ethyl xanthate is used as collector. Reason: Sulphide ores are water soluble.
Answer» Assertion – In froth flotation process sodium ethyl xanthate is used as collector. Reason: Sulphide ores are water soluble.

6597.

Assertion – In froth flotation process sodium ethyl xanthate is used as collector. Reason: Sulphide ores are water soluble.

Answer»

Assertion – In froth flotation process sodium ethyl xanthate is used as collector.

Reason: Sulphide ores are water soluble.

Discussion

6598.	If radius of a nitrogen molecule to be roughly 1.0A then mean free path of nitrogen molecule in a cylinder containing nitrogen at 2atm and temperature 17°C(molecular mass of nitrogen =28g)
Answer» If radius of a nitrogen molecule to be roughly 1.0A then mean free path of nitrogen molecule in a cylinder containing nitrogen at 2atm and temperature 17°C(molecular mass of nitrogen =28g)

Discussion

6599.	Base + X → Salt + H2OFind X ?
Answer» Base + X $\to$ Salt + H₂O Find X ?

6599.

Base + X → Salt + H2OFind X ?

Answer»

Base + X $\to$ Salt + H₂O

Find X ?

Discussion

6600.	the galvanic cell Ag AgCl(s), KCI(0.2M) \|\| KBr(0.001IM), AgBr(s)\| Ag The anode is[ Ksp (AgCI) 2.8 x 10-10. KSp (AgBr) 3.3 x 10-13
Answer» the galvanic cell Ag AgCl(s), KCI(0.2M) \|\| KBr(0.001IM), AgBr(s)\| Ag The anode is[ Ksp (AgCI) 2.8 x 10-10. KSp (AgBr) 3.3 x 10-13

Discussion

Explore topic-wise InterviewSolutions in .

20. X + conc. H2SO4 + K2Cr2O7 -------------> red brown vapours. X can be (1) NaCl (2) NaBr (3) both (1) and (2) (4) none of these

CaO + H2O → Ca(OH)2 is an example of a:

CaO does not react with 1) SiO2 2) P4O10 3) CO2 4) Mg

What is denatured alcohol ?

The t12 of first order reaction is 60 min. What will be % of substance left after 240 min?

what would happen to NO3^- ions in electroplating of silver

Iodoform can be prepared from all except

Name the experiment illustrated above.Which property of hydrogen chloride is demonstrated by this experiment?

Convert 0.1 .molesof aqueous H2SO4 into mass/volume percentage

N phenyl hydroxylamine is obtained when nitro benzene is reacted with SN/HCl Zn/NH4ClAs2O3/NaOH Zn/NaOH

On the passage of excess of Ammonia, colourless Nessler's reagent solution changes its colour to ___ .

Identify the functional group present in the following compound and name it according to IUPAC system : CH3OH

State which of the two — a solution of HCl in water or in toluene is an electrolyte. Explain.

The ratio of the energy of a photon of 2000 Å wavelength radiation to that of 4000 Å radiation is:

According to modern periodic table, the properties of elements are a periodic function of their:

The salt which will give a neutral solution on dissolving in water will be : (a) CH3COONa (b) NH4Cl (c) KCl (d) Na2CO3

Write the balanced chemical equation for the combustion of Zn?

Complete and balance the following equation: Cu + HNO3 → NO2 + ........ + ........

give two uses of washing soda and baking soda.

Two bottles A and B contain 2M and 2m aquous solutions of H2SO4 respectively ,then ( d= 1g/mL) 1 ) A is more concentrated than B 2) B is more concentrated than A 3) concentaration of A and B are equal 4) impossible to say .?

what is wrong with the following chemical equation ? Mg + O ⟶ MgO Correct ana balance it

Select the statements that are true.

Question 35.What happens when nitric acid is added to egg shell ?

The heat of combustion of yellow phosphorous &amp; red phosphorous are - 9.91 KJ and - 8.78 KJ respectively. The heat of transition of yellow phosphorous to red phosphorous is:

Choose the correct option:

(b) Give the IUPAC names of the following compounds:11_Page298_Figure_Frank_Chemistry_PartII

why iodine is not mentioned in newland table as it was discovered in1811?

For what angle between A and B , [ A+ B ] = [ A-B ] explain in proper way with full of explanation ?

Give atleast 3 structural differences between an artery and a vein

What do you mean by water of crystallisation of a substance?

(a) Write the formula of the functional group present in carboxylic acids. (b) Name the functional group present in CH3−C≡CH. (c) Name the functional groups present in the following compounds : (i) CH3−CHO (ii) CH3−CH2−COOH (iii) CH3−O||C−CH3 (iv) CH3−CH2−CH2−OH

Number of chain isomers of C6H14 is:

In a given atom no two electrons can have the same values for all the four quantum numbers. This is due to:

How to use equilibrium constant K, in different problems

Which has higher PH value, 1M HCL or 1M naoh solution?

Which one is the correct summary equation of nitrogen fixation ?

Which of these has higher concentration of H+ ions.. 1M of HCl OR 1M of CH3COOH

Which of the following are mineral acids?

13.Why in real gas equation the volume mentioned is the free space available in the container hy subtracting the voljme of gas as (V-nb) but the volime taken should be of gas not the empty volume

At 300K the density of a certain gaseous molecule at 2 bar is double to that of dinitrogen at 4 bar .The molar mass of gaseous molecule is:

Assertion – In froth flotation process sodium ethyl xanthate is used as collector. Reason: Sulphide ores are water soluble.

If radius of a nitrogen molecule to be roughly 1.0A then mean free path of nitrogen molecule in a cylinder containing nitrogen at 2atm and temperature 17°C(molecular mass of nitrogen =28g)

Base + X → Salt + H2OFind X ?

the galvanic cell Ag AgCl(s), KCI(0.2M) || KBr(0.001IM), AgBr(s)| Ag The anode is[ Ksp (AgCI) 2.8 x 10-10. KSp (AgBr) 3.3 x 10-13

The heat of combustion of yellow phosphorous & red phosphorous are - 9.91 KJ and - 8.78 KJ respectively. The heat of transition of yellow phosphorous to red phosphorous is: