15280 + Interview Questions in Chemistry Page 173 InterviewSolution

8601.	Bee sting contains: (a) an acidic liquid (b) a salt solution (c) an alkaline liquid (d) an alcohol
Answer» Bee sting contains: (a) an acidic liquid (b) a salt solution (c) an alkaline liquid (d) an alcohol

8601.

Bee sting contains: (a) an acidic liquid (b) a salt solution (c) an alkaline liquid (d) an alcohol

Answer»

Bee sting contains:

(a) an acidic liquid

(b) a salt solution

(c) an alkaline liquid

(d) an alcohol

Discussion

8602.	28. Which of the following reaction is not possible? 1. I2 + con. HNO3 = HIO3 + NO2 2. O3 + PbS = PbSO4 + O2 3. KMnO4 + HCl (acidic medium) = Cl2 + Mn+2 4. K2Cr2O7 + NaCl (acidic medium) = Cl2 + Cr+3
Answer» 28. Which of the following reaction is not possible? 1. I2 + con. HNO3 = HIO3 + NO2 2. O3 + PbS = PbSO4 + O2 3. KMnO4 + HCl (acidic medium) = Cl2 + Mn+2 4. K2Cr2O7 + NaCl (acidic medium) = Cl2 + Cr+3

Discussion

8603.	Name the drying agent used in the lab during the preparation of a gas, formed by the reaction of sodium chloride and sulphuric acid?
Answer» Name the drying agent used in the lab during the preparation of a gas, formed by the reaction of sodium chloride and sulphuric acid?

Discussion

8604.	63. Why pentahalides of gp15 elements are more covalent than trihalides
Answer» 63. Why pentahalides of gp15 elements are more covalent than trihalides

Discussion

8605.	On heating gypsum at 373 K, we obtain:
Answer» On heating gypsum at 373 K, we obtain:

Discussion

8606.	Which of the following compounds does not contain a multiple bond?
Answer» Which of the following compounds does not contain a multiple bond?

Discussion

8607.	100 ml , 0.5(M) H2SO4 solution is completely neutralised by 50ml 0.1(M) NaOH solution and Xml 0.1(M) Ca(OH)2 solution . Find value of x.
Answer» 100 ml , 0.5(M) H2SO4 solution is completely neutralised by 50ml 0.1(M) NaOH solution and Xml 0.1(M) Ca(OH)2 solution . Find value of x.

Discussion

8608.	The heat of neutralization of LiOH and HCL at 25^°C is 34.868 kJ mol`1(mole inverse).The heat of ionisation of LiOH will be
Answer» The heat of neutralization of LiOH and HCL at 25^°C is 34.868 kJ mol`1(mole inverse).The heat of ionisation of LiOH will be

Discussion

8609.	0.001 mole of Cr(NH3)5(NO3)SO4 was passed through cation exchanger and the acid coming out of it required 20 ml 0.1M NaOH for neutralisation. Hence the complex is ?
Answer» 0.001 mole of Cr(NH3)5(NO3)SO4 was passed through cation exchanger and the acid coming out of it required 20 ml 0.1M NaOH for neutralisation. Hence the complex is ?

Discussion

8610.	What influence does a decrease in reactant concentration have on the system which is in equilibrium?
Answer» What influence does a decrease in reactant concentration have on the system which is in equilibrium?

Discussion

8611.	Identify the product D in the following series of reaction CH3COOHLiAlH4−−−−→AH+−−−→443KBBr2−−→Calc.−−−→KOHD
Answer» Identify the product D in the following series of reaction $C H_{3} C O O H L i A l H_{4} - --- \to A H^{+} - -- \to 443 K B B r_{2} - - \to C a l c . - -- \to K O H D$

8611.

Identify the product D in the following series of reaction CH3COOHLiAlH4−−−−→AH+−−−→443KBBr2−−→Calc.−−−→KOHD

Answer»

Identify the product D in the following series of reaction

$C H_{3} C O O H L i A l H_{4} - --- \to A H^{+} - -- \to 443 K B B r_{2} - - \to C a l c . - -- \to K O H D$

Discussion

8612.	Plastic waste is being generated on a large scale and it is non biodegradable and it is adding trash on Earth what best it can be put to ?explain
Answer» Plastic waste is being generated on a large scale and it is non biodegradable and it is adding trash on Earth what best it can be put to ?explain

Discussion

8613.	At an instant an atomic orbital has one sign of schi. So while froming molecular orbital only type of orbital should be formed, either bonding or non bonding. What is the cause of forming both of them?
Answer» At an instant an atomic orbital has one sign of schi. So while froming molecular orbital only type of orbital should be formed, either bonding or non bonding. What is the cause of forming both of them?

Discussion

8614.	If NaCl and Na2O are neutral, then why they are considered as ions? Ions carry either positive or negative charge, still why these two are ions?
Answer» If NaCl and Na2O are neutral, then why they are considered as ions? Ions carry either positive or negative charge, still why these two are ions?

Discussion

8615.	68. Why SRP of group 13 elements increase down the group
Answer» 68. Why SRP of group 13 elements increase down the group

Discussion

8616.	An S-curve hydrograph has been obtained for catchment of 270 km2 from a 3 hour unit hydrograph. The equilibrium discharge for the S-curve is
Answer» An S-curve hydrograph has been obtained for catchment of $270 k m^{2}$ from a 3 hour unit hydrograph. The equilibrium discharge for the S-curve is

Discussion

8617.	Which of the following is a correct expression for the integrated rate law of first order reaction : A→Products ?Here,a=[A]0=Initial concentration of the reactant A(a−x)=[A]=Concentration of the reactant A at time t
Answer» Which of the following is a correct expression for the integrated rate law of first order reaction : $A \to Products$ ? Here, $a = [A]_{0} = Initial concentration of the reactant A$ $(a - x) = [A] = Concentration of the reactant A at time t$

Discussion

8618.	maximum number of covalent bond between two like atoms can b
Answer» maximum number of covalent bond between two like atoms can b

Discussion

8619.	whose energy is greater a molecule or the atom constituting the molecule?Why?
Answer» whose energy is greater a molecule or the atom constituting the molecule?Why?

Discussion

8620.	Which of the following graphs represent Boyle's law?
Answer» Which of the following graphs represent Boyle's law?

Discussion

8621.	\vert.Which of the following elements forms an acidic oxide?(a) Mg(b) Na(c) P(d) K
Answer» \vert.Which of the following elements forms an acidic oxide?(a) Mg(b) Na(c) P(d) K

Discussion

8622.	In case of Friedel Craft alkylation, polyalkylation takes place because
Answer» In case of Friedel Craft alkylation, polyalkylation takes place because

Discussion

8623.	A hole diffuses from the P−side to the N−side in a P−N junction. This means that
Answer» A hole diffuses from the $P -$ side to the $N -$ side in a $P - N$ junction. This means that

Discussion

8624.	Why must the size of the reflector be larger than the wavelength of the sound wave for reflection to take place?
Answer» Why must the size of the reflector be larger than the wavelength of the sound wave for reflection to take place?

Discussion

8625.	Which of the following is the incorrect representation of the formation of molecules in Lewis dot structures?
Answer» Which of the following is the incorrect representation of the formation of molecules in Lewis dot structures?

Discussion

8626.	Which property of H2SO4 allows it to be used in preparation of HCL and HNO3?
Answer» Which property of H2SO4 allows it to be used in preparation of HCL and HNO3?

Discussion

8627.	is alkylidene group true in the lates IUPAC nomenclature. or IUPAC has changed this naming pattern of alkylidene .
Answer» is alkylidene group true in the lates IUPAC nomenclature. or IUPAC has changed this naming pattern of alkylidene .

Discussion

8628.	When atoms of different elements join together with an attractive force to form a molecule then this type of molecule is known as?
Answer» When atoms of different elements join together with an attractive force to form a molecule then this type of molecule is known as?

Discussion

8629.	(i) What is meant by concentration of ores?(ii) Name the process of concentration,(a) based on densities(b) based on magnetic nature(iii) How an ore is concentrated by froth flotation process?
Answer» (i) What is meant by concentration of ores? (ii) Name the process of concentration, (a) based on densities (b) based on magnetic nature (iii) How an ore is concentrated by froth flotation process?

Discussion

8630.	When Mr. Haber was creating Ammonia, he had a big problem. He couldn't get his catalyst which worked on adsorption to work efficiently. He had to use too many expensive iron blocks. One day his student replaced them with fine iron powder. It worked miraculously better. What made the difference?
Answer» When Mr. Haber was creating Ammonia, he had a big problem. He couldn't get his catalyst which worked on adsorption to work efficiently. He had to use too many expensive iron blocks. One day his student replaced them with fine iron powder. It worked miraculously better. What made the difference?

Discussion

8631.	Mole cancept
Answer» Mole cancept

Discussion

8632.	What happens when (write chemical equation in each case) (a) ethanol is burnt in air? (b) ethanol is heated with excess conc. H2SO4 at 443 K? (c) A piece of sodium is dropped into ethanol?
Answer» What happens when (write chemical equation in each case) (a) ethanol is burnt in air? (b) ethanol is heated with excess conc. $H_{2} S O_{4}$ at 443 K? (c) A piece of sodium is dropped into ethanol?

Discussion

8633.	How many electrons are shared in a double bond?
Answer» How many electrons are shared in a double bond?

Discussion

8634.	a compound A when reacts with LiAlH4 it gives two compounds B and C along with LiF .compounds A, B ,C respectively are(1) HF,H2 , AlF3 (2)BF3 , H2 , AlF3(3) BF3 , B2H6 ,AlF3(4)B2H6 ,BF3 ,AlF3
Answer» a compound A when reacts with LiAlH4 it gives two compounds B and C along with LiF .compounds A, B ,C respectively are (1) HF,H2 , AlF3 (2)BF3 , H2 , AlF3 (3) BF3 , B2H6 ,AlF3 (4)B2H6 ,BF3 ,AlF3

Discussion

8635.	KOH(aq) + HNO3(aq)→H2O(l) + KN3(aq)Identify the reactants in the following reaction.
Answer» $KOH (aq) + {HNO}_{3} (aq) \to H_{2} O (l) + {KN}_{3} (aq)$ Identify the reactants in the following reaction.

Discussion

8636.	(a) When sodium is burnt in chlorine, sodium chloride is formed, and when molten sodium chloride is electrolysed, then sodium and chlorine are formed. What type of reaction takes place: (i) in the first case? (ii) in the second case?(b) When hydrogen is passed over heated copper oxide, copper and steam are formed. Write a balanced chemical equation for this reaction. State which of the chemicals is oxidised and which one is reduced?(c) What would you observe when zinc is added to a solution of iron sulphate? Write the chemical equation of the reaction which takes place. Why does this reaction occur?
Answer» (a) When sodium is burnt in chlorine, sodium chloride is formed, and when molten sodium chloride is electrolysed, then sodium and chlorine are formed. What type of reaction takes place: (i) in the first case? (ii) in the second case? (b) When hydrogen is passed over heated copper oxide, copper and steam are formed. Write a balanced chemical equation for this reaction. State which of the chemicals is oxidised and which one is reduced? (c) What would you observe when zinc is added to a solution of iron sulphate? Write the chemical equation of the reaction which takes place. Why does this reaction occur?

Discussion

8637.	Dilute Sulphuric acid is a ___ conductor of electricity.
Answer» Dilute Sulphuric acid is a ___ conductor of electricity.

Discussion

8638.	For the eqbm PQ=P+Q at 300 K.The pressure at which 50% of PQ is dissociated is numerically given by
Answer» For the eqbm PQ=P+Q at 300 K.The pressure at which 50% of PQ is dissociated is numerically given by

Discussion

8639.	Why melting point of covalent solid greater than ionic solids ?
Answer» Why melting point of covalent solid greater than ionic solids ?

Discussion

8640.	How will you demonstrate the solubility of ammonia in water? Explain.
Answer» How will you demonstrate the solubility of ammonia in water? Explain.

Discussion

8641.	the energy required to exite an electron from ground state to 2nd excited state of H atom will be
Answer» the energy required to exite an electron from ground state to 2nd excited state of H atom will be

Discussion

8642.	ntIn the electrolysis of an aqueos solution of sodium sulphate 2.4 litre of oxygen at STP was liberated at anode . The volume of hydrogen at STP liberated at cathode would be ?n
Answer» ntIn the electrolysis of an aqueos solution of sodium sulphate 2.4 litre of oxygen at STP was liberated at anode . The volume of hydrogen at STP liberated at cathode would be ?n

Discussion

8643.	19. a chemical reaction was carried out at 300 K and 280 K, the reaction constant were found to be K1 and K2 respectively. Then 1. K2=4K1 2. K1=4K2 3. K2=0.5K1 4. K1=0.5K2
Answer» 19. a chemical reaction was carried out at 300 K and 280 K, the reaction constant were found to be K1 and K2 respectively. Then 1. K2=4K1 2. K1=4K2 3. K2=0.5K1 4. K1=0.5K2

Discussion

8644.	state two condition necessary to liquefy a gas
Answer» state two condition necessary to liquefy a gas

Discussion

8645.	Ionic solids conduct electricity in molten state but not in solid state, explain why
Answer» Ionic solids conduct electricity in molten state but not in solid state, explain why

Discussion

8646.	Paheli prepared a blue-coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojo prepared a yellowish-green solution of ferrous sulphate in beaker B and placed a copper wire in it. What changes will they observe in the two beakers after an hour?
Answer» Paheli prepared a blue-coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojo prepared a yellowish-green solution of ferrous sulphate in beaker B and placed a copper wire in it. What changes will they observe in the two beakers after an hour?

Discussion

8647.	What are the uses of carbon dioxide gas?
Answer» What are the uses of carbon dioxide gas?

Discussion

8648.	Name two metals which from amphoteric oxides.
Answer» Name two metals which from amphoteric oxides.

Discussion

8649.	What is hydration
Answer» What is hydration

Discussion

8650.	How to balance the redox reactions
Answer» How to balance the redox reactions

Discussion

Explore topic-wise InterviewSolutions in .

Bee sting contains: (a) an acidic liquid (b) a salt solution (c) an alkaline liquid (d) an alcohol

28. Which of the following reaction is not possible? 1. I2 + con. HNO3 = HIO3 + NO2 2. O3 + PbS = PbSO4 + O2 3. KMnO4 + HCl (acidic medium) = Cl2 + Mn+2 4. K2Cr2O7 + NaCl (acidic medium) = Cl2 + Cr+3

Name the drying agent used in the lab during the preparation of a gas, formed by the reaction of sodium chloride and sulphuric acid?

63. Why pentahalides of gp15 elements are more covalent than trihalides

On heating gypsum at 373 K, we obtain:

Which of the following compounds does not contain a multiple bond?

100 ml , 0.5(M) H2SO4 solution is completely neutralised by 50ml 0.1(M) NaOH solution and Xml 0.1(M) Ca(OH)2 solution . Find value of x.

The heat of neutralization of LiOH and HCL at 25^°C is 34.868 kJ mol`1(mole inverse).The heat of ionisation of LiOH will be

0.001 mole of Cr(NH3)5(NO3)SO4 was passed through cation exchanger and the acid coming out of it required 20 ml 0.1M NaOH for neutralisation. Hence the complex is ?

What influence does a decrease in reactant concentration have on the system which is in equilibrium?

Identify the product D in the following series of reaction CH3COOHLiAlH4−−−−→AH+−−−→443KBBr2−−→Calc.−−−→KOHD

Plastic waste is being generated on a large scale and it is non biodegradable and it is adding trash on Earth what best it can be put to ?explain

At an instant an atomic orbital has one sign of schi. So while froming molecular orbital only type of orbital should be formed, either bonding or non bonding. What is the cause of forming both of them?

If NaCl and Na2O are neutral, then why they are considered as ions? Ions carry either positive or negative charge, still why these two are ions?

68. Why SRP of group 13 elements increase down the group

An S-curve hydrograph has been obtained for catchment of 270 km2 from a 3 hour unit hydrograph. The equilibrium discharge for the S-curve is

Which of the following is a correct expression for the integrated rate law of first order reaction : A→Products ?Here,a=[A]0=Initial concentration of the reactant A(a−x)=[A]=Concentration of the reactant A at time t

maximum number of covalent bond between two like atoms can b

whose energy is greater a molecule or the atom constituting the molecule?Why?

Which of the following graphs represent Boyle's law?

\vert.Which of the following elements forms an acidic oxide?(a) Mg(b) Na(c) P(d) K

In case of Friedel Craft alkylation, polyalkylation takes place because

A hole diffuses from the P−side to the N−side in a P−N junction. This means that

Why must the size of the reflector be larger than the wavelength of the sound wave for reflection to take place?

Which of the following is the incorrect representation of the formation of molecules in Lewis dot structures?

Which property of H2SO4 allows it to be used in preparation of HCL and HNO3?

is alkylidene group true in the lates IUPAC nomenclature. or IUPAC has changed this naming pattern of alkylidene .

When atoms of different elements join together with an attractive force to form a molecule then this type of molecule is known as?

(i) What is meant by concentration of ores?(ii) Name the process of concentration,(a) based on densities(b) based on magnetic nature(iii) How an ore is concentrated by froth flotation process?

When Mr. Haber was creating Ammonia, he had a big problem. He couldn't get his catalyst which worked on adsorption to work efficiently. He had to use too many expensive iron blocks. One day his student replaced them with fine iron powder. It worked miraculously better. What made the difference?

Mole cancept

What happens when (write chemical equation in each case) (a) ethanol is burnt in air? (b) ethanol is heated with excess conc. H2SO4 at 443 K? (c) A piece of sodium is dropped into ethanol?

How many electrons are shared in a double bond?

a compound A when reacts with LiAlH4 it gives two compounds B and C along with LiF .compounds A, B ,C respectively are(1) HF,H2 , AlF3 (2)BF3 , H2 , AlF3(3) BF3 , B2H6 ,AlF3(4)B2H6 ,BF3 ,AlF3

KOH(aq) + HNO3(aq)→H2O(l) + KN3(aq)Identify the reactants in the following reaction.

Dilute Sulphuric acid is a ___ conductor of electricity.

For the eqbm PQ=P+Q at 300 K.The pressure at which 50% of PQ is dissociated is numerically given by

Why melting point of covalent solid greater than ionic solids ?

How will you demonstrate the solubility of ammonia in water? Explain.

the energy required to exite an electron from ground state to 2nd excited state of H atom will be

ntIn the electrolysis of an aqueos solution of sodium sulphate 2.4 litre of oxygen at STP was liberated at anode . The volume of hydrogen at STP liberated at cathode would be ?n

19. a chemical reaction was carried out at 300 K and 280 K, the reaction constant were found to be K1 and K2 respectively. Then 1. K2=4K1 2. K1=4K2 3. K2=0.5K1 4. K1=0.5K2

state two condition necessary to liquefy a gas

Ionic solids conduct electricity in molten state but not in solid state, explain why

Paheli prepared a blue-coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojo prepared a yellowish-green solution of ferrous sulphate in beaker B and placed a copper wire in it. What changes will they observe in the two beakers after an hour?​

What are the uses of carbon dioxide gas?

Name two metals which from amphoteric oxides.

What is hydration

How to balance the redox reactions

Paheli prepared a blue-coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojo prepared a yellowish-green solution of ferrous sulphate in beaker B and placed a copper wire in it. What changes will they observe in the two beakers after an hour?