15280 + Interview Questions in Chemistry Page 186 InterviewSolution

9251.	Complete the trophic levels in the following basic food chain.Producers → ? → Secondary consumers → ? → Decomposers
Answer» Complete the trophic levels in the following basic food chain. Producers $\to$ ? $\to$ Secondary consumers $\to$ ? $\to$ Decomposers

9251.

Complete the trophic levels in the following basic food chain.Producers → ? → Secondary consumers → ? → Decomposers

Answer»

Complete the trophic levels in the following basic food chain.

Producers $\to$ ? $\to$ Secondary consumers $\to$ ? $\to$ Decomposers

9252.	Partial roasting done for cu ore to obtain copper matte is a method of reduction or concentration of ore?
Answer» Partial roasting done for cu ore to obtain copper matte is a method of reduction or concentration of ore?

Discussion

9253.	The molecular weight of O2 and SO2 are 32 and 64 respectively. If one litre of O2 at 15∘ C and 750 mm pressure contains 'N' molecules, the number of molecules in two litres of SO2 under the same conditions of temperature and pressure will be
Answer» The molecular weight of $O_{2}$ and $S O_{2}$ are 32 and 64 respectively. If one litre of $O_{2}$ at $15^{\circ} C$ and 750 mm pressure contains 'N' molecules, the number of molecules in two litres of $S O_{2}$ under the same conditions of temperature and pressure will be

Discussion

9254.	State the octet rule with an example.
Answer» State the octet rule with an example.

Discussion

9255.	21. Why The boiling point of pentane is greater than isopentane? And why the boiling point of neopentane is less than N pentane and isopentane?
Answer» 21. Why The boiling point of pentane is greater than isopentane? And why the boiling point of neopentane is less than N pentane and isopentane?

Discussion

9256.	The oxidizing agent in the lead storage battery is and why ? (1)Pb (2)PbO2 (3)PbSO4 (4)H2SO4
Answer» The oxidizing agent in the lead storage battery is and why ? (1)Pb (2)PbO₂ (3)PbSO₄(4)H₂SO₄

Discussion

9257.	Match the following names with their functional group structure: List−IList−II(P)Alkanol1.−O\|\|C−OH(Q)Alkanal2.−O\|\|C−(R)Alkanone3.−O\|\|C−H(S)Alkanoic acid4.−OH
Answer» Match the following names with their functional group structure: $\begin{matrix} L i s t - I & L i s t - I I (P) & A l k a n o l & 1. & - O \| \| C - O H (Q) & A l k a n a l & 2. & - O \| \| C - (R) & A l k a n o n e & 3. & - O \| \| C - H (S) & A l k a n o i c a c i d & 4. & - O H \end{matrix}$

Discussion

9258.	11. Calculate the pH at the equivalence point in the titration of 25 mL of 0.10M formic acid with a 0.1M NaOH solution (given that pKa of formic acid = 3.74). [log2 = 0.30]
Answer» 11. Calculate the pH at the equivalence point in the titration of 25 mL of 0.10M formic acid with a 0.1M NaOH solution (given that pKa of formic acid = 3.74). [log2 = 0.30]

Discussion

9259.	20. In which of the following molecules ,central atoms has more than 8 electrons in outermost orbit? 1-so3 2-so2 3-p2o5 4-all of these ?
Answer» 20. In which of the following molecules ,central atoms has more than 8 electrons in outermost orbit? 1-so3 2-so2 3-p2o5 4-all of these ?

Discussion

9260.	102.In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potential V and then made to describe semicircular paths of radius R using a magnetic field B. If V and B are kept constant, the ratio charge on the ion to mass of the ion will be proportional to
Answer» 102.In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potential V and then made to describe semicircular paths of radius R using a magnetic field B. If V and B are kept constant, the ratio charge on the ion to mass of the ion will be proportional to

Discussion

9261.	The equivalent conductances at infinite dilution of HCl andNaCl are 426.15 and 126.15 mho cm g eq respectively. Itcan be said that the mobility of:(a) H ions is much more than that of Cl ions(b) C ions is much more than that of H ions(c) H ions is much more than that of Na ions[CET (Gujarat) 20061(d) Na ions is much more than that of H ions+
Answer» The equivalent conductances at infinite dilution of HCl and NaCl are 426.15 and 126.15 mho cm g eq respectively. It can be said that the mobility of: (a) H ions is much more than that of Cl ions (b) C ions is much more than that of H ions (c) H ions is much more than that of Na ions [CET (Gujarat) 20061 (d) Na ions is much more than that of H ions +

Discussion

9262.	Give three reactions to show reducing property of ammonia.
Answer» Give three reactions to show reducing property of ammonia.

Discussion

9263.	How is impure copper purified by electrolysis? Explain.
Answer» How is impure copper purified by electrolysis? Explain.

Discussion

9264.	What is meant by refining of metals? Name the three common methods used for refining.
Answer» What is meant by refining of metals? Name the three common methods used for refining.

Discussion

9265.	What product is formed when aluminum metal is treated with concentrated nitric acid?
Answer» What product is formed when aluminum metal is treated with concentrated nitric acid?

Discussion

9266.	All acids contain hydrogen. What happens if you replace this hydrogen with a metal?
Answer» All acids contain hydrogen. What happens if you replace this hydrogen with a metal?

Discussion

9267.	35.Does dx2-y2 orbital only form sigma bond?
Answer» 35.Does dx2-y2 orbital only form sigma bond?

Discussion

9268.	The half time of first order decomposition of nitramide is 2.1 hr at 15∘C.NH2NO2(s)→N2O(g)+H2O(l)If 6.2 g of NH2NO2 is allowed to decompose, then time taken for NH2NO2 to decompose 99% and volume of dry N2O produced at this point measured respectively at STP will be
Answer» The half time of first order decomposition of nitramide is $2.1 hr$ at $15^{\circ} C$ . $N H_{2} N O_{2} (s) \to N_{2} O (g) + H_{2} O (l)$ If $6.2 g$ of $N H_{2} N O_{2}$ is allowed to decompose, then time taken for $N H_{2} N O_{2}$ to decompose $99 %$ and volume of dry $N_{2} O$ produced at this point measured respectively at STP will be

Discussion

9269.	Two solutions A and B have pH values of 4 and 10, respectively. Which solution has more hydrogen ion concentration?
Answer» Two solutions A and B have pH values of 4 and 10, respectively. Which solution has more hydrogen ion concentration?

Discussion

9270.	CH3COOHLiAiH4⟶(A),(A)+CH3COOHH3O+⟶(B)+H2OIn the given reaction 'A' and 'B' respectively are ?
Answer» $C H_{3} C O O H L i A i H_{4} ⟶ (A)$ , $(A) + C H_{3} C O O H H_{3} O^{+} ⟶ (B) + H_{2} O$ In the given reaction 'A' and 'B' respectively are ?

Discussion

9271.	What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
Answer» What are trophic levels? Give an example of a food chain and state the different trophic levels in it.

Discussion

9272.	Question 3Which of the following statements about the given reaction are correct?3Fe(s)+4H2O(g)→Fe3O4(s)+4H2(g)(i) Iron metal is getting oxidised(ii) Water is getting reduced(iii) Water is acting as reducing agent(iv) Water is acting as oxidizing agent(a) (i), (ii) and (iii)(b) (iii) and (iv)(c) (i), (ii) and (iv)(d) (ii) and (iv)
Answer» Question 3 Which of the following statements about the given reaction are correct? $3 Fe(s) + 4 H_{2} O(g) \to {Fe}_{3} O_{4} (s) + 4 H_{2} (g)$ (i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidizing agent (a) (i), (ii) and (iii) (b) (iii) and (iv) (c) (i), (ii) and (iv) (d) (ii) and (iv)

Discussion

9273.	A proton, a deuteron and an alpha particle areaccelerated th rough potentials of V, 2V an d 4Vrespectively. Their velocity will be in ratio
Answer» A proton, a deuteron and an alpha particle areaccelerated th rough potentials of V, 2V an d 4Vrespectively. Their velocity will be in ratio

Discussion

9274.	Of the following compounds, the one having a linear structure is:
Answer» Of the following compounds, the one having a linear structure is:

9274.

Of the following compounds, the one having a linear structure is:

Answer»

Of the following compounds, the one having a linear structure is:

Discussion

9275.	What is ellingham diagrams
Answer» What is ellingham diagrams

Discussion

9276.	In the following sequence of reaction,TolueneKMnO4−−−−−→ASOCl2−−−−→BH2/Pd−−−−→BaSO4CThe product C is
Answer» In the following sequence of reaction, $T o l u e n e K M n O_{4} - ---- \to A S O C l_{2} - --- \to B H_{2} / P d - --- \to B a S O_{4} C$ The product C is

Discussion

9277.	Choose the correct answer from the options given below:This metal is a liquid at room temperature.(a) Potassium(b) Zinc(c) Gold(d) Mercury
Answer» Choose the correct answer from the options given below: This metal is a liquid at room temperature. (a) Potassium (b) Zinc (c) Gold (d) Mercury

Discussion

9278.	Question 4Explain the nature of the covalent bond using the bond formation in CH3Cl.
Answer» Question 4 Explain the nature of the covalent bond using the bond formation in ${CH}_{3} Cl$ .

Discussion

9279.	The correct order metals based on their tendency to lose electron is:
Answer» The correct order metals based on their tendency to lose electron is:

Discussion

9280.	120 g of CaO reacts with 32 g of SO2. The mass of CaSO3 produced is.
Answer» 120 g of CaO reacts with 32 g of SO2. The mass of CaSO3 produced is.

Discussion

9281.	GADOLIMIUM BELONGS OF 41 SERIES.ITS ATOMIC NUMBER IS 64.WHAT IS ITS ELECTRONIC CONFIGURATION
Answer» GADOLIMIUM BELONGS OF 41 SERIES.ITS ATOMIC NUMBER IS 64.WHAT IS ITS ELECTRONIC CONFIGURATION

Discussion

9282.	How many elements are discovered till date and how are they classified?
Answer» How many elements are discovered till date and how are they classified?

Discussion

9283.	For 109%labelled oleum if the number of moles of H2SO4 and free SO3 be x & y respectively , then what will be the approximate value of (x + y)/(x - y) ?
Answer» For 109%labelled oleum if the number of moles of H2SO4 and free SO3 be x & y respectively , then what will be the approximate value of (x + y)/(x - y) ?

Discussion

9284.	What is an ionic equitation? Explain with an example.
Answer» What is an ionic equitation? Explain with an example.

Discussion

9285.	Sudha dipped a copper coin in a solution of silver nitrate. After some time she saw the silver shine on the coin. Why? Give the balanced chemical equation for the same..
Answer» Sudha dipped a copper coin in a solution of silver nitrate. After some time she saw the silver shine on the coin. Why? Give the balanced chemical equation for the same..

Discussion

9286.	One mole sample of FeO is heated in air until it iscompletely converted into Fe O3. The percentageincrease in weight of sample is \lbrack Given: Atomic massof Fe = 56\rbrack
Answer» One mole sample of FeO is heated in air until it iscompletely converted into Fe O3. The percentageincrease in weight of sample is \lbrack Given: Atomic massof Fe = 56\rbrack

Discussion

9287.	Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?(i) Good thermal conductivity(ii) Good electrical conductivity(iii) Ductility(iv) High melting point(a) (i) and (ii) (b) (i) and (iii)(c) (ii) and (iii) (d) (i) and (iv)
Answer» Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same? (i) Good thermal conductivity (ii) Good electrical conductivity (iii) Ductility (iv) High melting point (a) (i) and (ii) (b) (i) and (iii) (c) (ii) and (iii) (d) (i) and (iv)

9287.

Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?(i) Good thermal conductivity(ii) Good electrical conductivity(iii) Ductility(iv) High melting point(a) (i) and (ii) (b) (i) and (iii)(c) (ii) and (iii) (d) (i) and (iv)

Answer»

Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?

(i) Good thermal conductivity

(ii) Good electrical conductivity

(iii) Ductility

(iv) High melting point

(a) (i) and (ii) (b) (i) and (iii)

(c) (ii) and (iii) (d) (i) and (iv)

Discussion

9288.	What is the valexny of x in x2(so4)3 and what will it's formula be with Y if Y forms a compound YCL
Answer» What is the valexny of x in x2(so4)3 and what will it's formula be with Y if Y forms a compound YCL

Discussion

9289.	Zinc and hydrochloric acid react according to the equation Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g) 0.30 mole of Zn is added to 0.52 mole of HCl. Which of the two reactants is the limiting reagent and how many moles of H2 is produced?
Answer» Zinc and hydrochloric acid react according to the equation $Z n (s) + 2 H C l (a q) \to Z n C l_{2} (a q) + H_{2} (g)$ 0.30 mole of $Z n$ is added to 0.52 mole of $H C l$ . Which of the two reactants is the limiting reagent and how many moles of $H_{2}$ is produced?

Discussion

9290.	Why does plaster of Paris have 1/2 molecule of water? Why does 2 CaSO4 molecules share one molecule of water?
Answer» Why does plaster of Paris have 1/2 molecule of water? Why does 2 CaSO4 molecules share one molecule of water?

Discussion

9291.	3g of H2 reacts with 29 g of O2 to give H2O.Find i) Limiting reagent ii)Max amount of H2O formed iii) Amount of reactants which remains unreacted.
Answer» 3g of H2 reacts with 29 g of O2 to give H2O.Find i) Limiting reagent ii)Max amount of H2O formed iii) Amount of reactants which remains unreacted.

Discussion

9292.	The ionic compound Ca(OH)2 on dissociation gives a cation X. The charge on this on cation is ___.
Answer» The ionic compound $C a (O H)_{2}$ on dissociation gives a cation X. The charge on this on cation is ___.

Discussion

9293.	Question 25Write the balanced chemical equations for the following reactions-(a) Sodium carbonate on reaction with hydrochloric acid in equal molar concentration gives sodium chloride and sodium hydrogen carbonate.(b) Sodium hydrogen carbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide.(c) Copper sulphate on treatment with potassium iodide precipitates cuprous iodide (Cu2I2), liberates iodine gas and also forms potassium sulphate.
Answer» Question 25 Write the balanced chemical equations for the following reactions- (a) Sodium carbonate on reaction with hydrochloric acid in equal molar concentration gives sodium chloride and sodium hydrogen carbonate. (b) Sodium hydrogen carbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide. (c) Copper sulphate on treatment with potassium iodide precipitates cuprous iodide $({Cu}_{2} I_{2})$ , liberates iodine gas and also forms potassium sulphate.

Discussion

9294.	Analyse the given compound belowHow many carbon atoms are there in the longest chain?
Answer» Analyse the given compound below How many carbon atoms are there in the longest chain?

9294.

Analyse the given compound belowHow many carbon atoms are there in the longest chain?

Answer»

Analyse the given compound below

How many carbon atoms are there in the longest chain?

Discussion

9295.	Question 5(a)Write word equations and then balanced equations for the reaction taking place when:(a) Dilute sulphuric acid reacts with zinc granules
Answer» Question 5(a) Write word equations and then balanced equations for the reaction taking place when: (a) Dilute sulphuric acid reacts with zinc granules

Discussion

9296.	The test-tube I contains sodium bicarbonate soultion whereas test-tube II contains lemon juice. On introducing pH paper strips in both the solutions, it is observed that the pH paper turns :(1) red in I and blue in II(2) blue in both (3) blue in I and red in II(4) red in I and pink in II
Answer» The test-tube I contains sodium bicarbonate soultion whereas test-tube II contains lemon juice. On introducing pH paper strips in both the solutions, it is observed that the pH paper turns : (1) red in I and blue in II (2) blue in both (3) blue in I and red in II (4) red in I and pink in II

Discussion

9297.	26.How many bond angles in SiCl4 and CH4 with explanation
Answer» 26.How many bond angles in SiCl4 and CH4 with explanation

Discussion

9298.	Give reason The size if fluorine ion is greater than fluorine atom
Answer» Give reason The size if fluorine ion is greater than fluorine atom

Discussion

9299.	Which among the following molecules are example(s) of molecule formed by catenation property?
Answer» Which among the following molecules are example(s) of molecule formed by catenation property?

Discussion

9300.	Why can't we use Concentrated H2SO4 for drying ammonia?
Answer» Why can't we use Concentrated $H_{2} S O_{4}$ for drying ammonia?

Discussion

Explore topic-wise InterviewSolutions in .

Complete the trophic levels in the following basic food chain.Producers → ? → Secondary consumers → ? → Decomposers

Partial roasting done for cu ore to obtain copper matte is a method of reduction or concentration of ore?

The molecular weight of O2 and SO2 are 32 and 64 respectively. If one litre of O2 at 15∘ C and 750 mm pressure contains 'N' molecules, the number of molecules in two litres of SO2 under the same conditions of temperature and pressure will be

State the octet rule with an example.

21. Why The boiling point of pentane is greater than isopentane? And why the boiling point of neopentane is less than N pentane and isopentane?

The oxidizing agent in the lead storage battery is and why ? (1)Pb (2)PbO2 (3)PbSO4 (4)H2SO4

Match the following names with their functional group structure: List−IList−II(P)Alkanol1.−O||C−OH(Q)Alkanal2.−O||C−(R)Alkanone3.−O||C−H(S)Alkanoic acid4.−OH

11. Calculate the pH at the equivalence point in the titration of 25 mL of 0.10M formic acid with a 0.1M NaOH solution (given that pKa of formic acid = 3.74). [log2 = 0.30]

20. In which of the following molecules ,central atoms has more than 8 electrons in outermost orbit? 1-so3 2-so2 3-p2o5 4-all of these ?

Give three reactions to show reducing property of ammonia.

How is impure copper purified by electrolysis? Explain.

What is meant by refining of metals? Name the three common methods used for refining.

What product is formed when aluminum metal is treated with concentrated nitric acid?

All acids contain hydrogen. What happens if you replace this hydrogen with a metal?

35.Does dx2-y2 orbital only form sigma bond?

The half time of first order decomposition of nitramide is 2.1 hr at 15∘C.NH2NO2(s)→N2O(g)+H2O(l)If 6.2 g of NH2NO2 is allowed to decompose, then time taken for NH2NO2 to decompose 99% and volume of dry N2O produced at this point measured respectively at STP will be

Two solutions A and B have pH values of 4 and 10, respectively. Which solution has more hydrogen ion concentration?

CH3COOHLiAiH4⟶(A),(A)+CH3COOHH3O+⟶(B)+H2OIn the given reaction 'A' and 'B' respectively are ?

What are trophic levels? Give an example of a food chain and state the different trophic levels in it.

A proton, a deuteron and an alpha particle areaccelerated th rough potentials of V, 2V an d 4Vrespectively. Their velocity will be in ratio

Of the following compounds, the one having a linear structure is:

What is ellingham diagrams

In the following sequence of reaction,TolueneKMnO4−−−−−→ASOCl2−−−−→BH2/Pd−−−−→BaSO4CThe product C is

Choose the correct answer from the options given below:This metal is a liquid at room temperature.(a) Potassium(b) Zinc(c) Gold(d) Mercury

Question 4Explain the nature of the covalent bond using the bond formation in CH3Cl.

The correct order metals based on their tendency to lose electron is:

120 g of CaO reacts with 32 g of SO2. The mass of CaSO3 produced is.

GADOLIMIUM BELONGS OF 41 SERIES.ITS ATOMIC NUMBER IS 64.WHAT IS ITS ELECTRONIC CONFIGURATION

How many elements are discovered till date and how are they classified?

For 109%labelled oleum if the number of moles of H2SO4 and free SO3 be x & y respectively , then what will be the approximate value of (x + y)/(x - y) ?

What is an ionic equitation? Explain with an example.

Sudha dipped a copper coin in a solution of silver nitrate. After some time she saw the silver shine on the coin. Why? Give the balanced chemical equation for the same..

One mole sample of FeO is heated in air until it iscompletely converted into Fe O3. The percentageincrease in weight of sample is \lbrack Given: Atomic massof Fe = 56\rbrack

Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?(i) Good thermal conductivity(ii) Good electrical conductivity(iii) Ductility(iv) High melting point(a) (i) and (ii) (b) (i) and (iii)(c) (ii) and (iii) (d) (i) and (iv)

What is the valexny of x in x2(so4)3 and what will it's formula be with Y if Y forms a compound YCL

Zinc and hydrochloric acid react according to the equation Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g) 0.30 mole of Zn is added to 0.52 mole of HCl. Which of the two reactants is the limiting reagent and how many moles of H2 is produced?

Why does plaster of Paris have 1/2 molecule of water? Why does 2 CaSO4 molecules share one molecule of water?

3g of H2 reacts with 29 g of O2 to give H2O.Find i) Limiting reagent ii)Max amount of H2O formed iii) Amount of reactants which remains unreacted.

The ionic compound Ca(OH)2 on dissociation gives a cation X. The charge on this on cation is ___.

Analyse the given compound belowHow many carbon atoms are there in the longest chain?

Question 5(a)Write word equations and then balanced equations for the reaction taking place when:(a) Dilute sulphuric acid reacts with zinc granules

The test-tube I contains sodium bicarbonate soultion whereas test-tube II contains lemon juice. On introducing pH paper strips in both the solutions, it is observed that the pH paper turns :(1) red in I and blue in II(2) blue in both (3) blue in I and red in II(4) red in I and pink in II

26.How many bond angles in SiCl4 and CH4 with explanation

Give reason The size if fluorine ion is greater than fluorine atom

Which among the following molecules are example(s) of molecule formed by catenation property?

Why can't we use Concentrated H2SO4 for drying ammonia?