15280 + Interview Questions in Chemistry

1.	Give the reactions of ethyne with(a) Hydrogen(b) Water(c) Bromine
Answer» Give the reactions of ethyne with (a) Hydrogen (b) Water (c) Bromine

Discussion

2.	an element whose atomic no is 112 . find the position in periodic table
Answer» an element whose atomic no is 112 . find the position in periodic table

Discussion

3.	Which of these is an odourless and colourless gas?
Answer» Which of these is an odourless and colourless gas?

Discussion

4.	The number of structural and configurational isomers of a bromo compound, C5H9Br, formed by the addition of HBr to 2−pentyne respectively x and y. Find the value of x+y.
Answer» The number of structural and configurational isomers of a bromo compound, $C_{5} H_{9} B r$ , formed by the addition of $H B r$ to $2 - p e n t y n e$ respectively $x$ and $y$ . Find the value of $x + y$ .

Discussion

5.	which of the following compound has all covalent, ionic, coordinate bond?a) NH4Clb)CaCl2c)K2SO4
Answer» which of the following compound has all covalent, ionic, coordinate bond? a) NH4Cl b)CaCl2 c)K2SO4

Discussion

6.	31.At 27^° c, the combustion of ethane take place according to the reaction c2H2(g)+7/2O2(g)--> 2Co2(g) + 3H2o(l) Δ E-Δ H for thos reaction at 27^° C will be
Answer» 31.At 27^° c, the combustion of ethane take place according to the reaction c2H2(g)+7/2O2(g)--> 2Co2(g) + 3H2o(l) Δ E-Δ H for thos reaction at 27^° C will be

Discussion

7.	Which of the following does not react with dilute sulphuric acid?
Answer» Which of the following does not react with dilute sulphuric acid?

Discussion

8.	what is N type semiconductor?
Answer» what is N type semiconductor?

Discussion

9.	3.65 g of HCL is present in 1 L of solution at 25 degrees celsius. If x L of water is added such that pH change by 1 unit at 25 degrees celsius, the value if x is (Assume no change in volume due to addition of acid in water
Answer» 3.65 g of HCL is present in 1 L of solution at 25 degrees celsius. If x L of water is added such that pH change by 1 unit at 25 degrees celsius, the value if x is (Assume no change in volume due to addition of acid in water

Discussion

10.	Buffer capacity of buffer containing acid with pKa = 4.75 will be highest. What is its pH value?
Answer» Buffer capacity of buffer containing acid with pKa = 4.75 will be highest. What is its pH value?

Discussion

11.	oxidation state of nitrogen in H-N ≡ C is options : (1) -4 (2) +3 (3) -3 (4) -2
Answer» oxidation state of nitrogen in H-N ≡ C is options : (1) -4 (2) +3 (3) -3 (4) -2

Discussion

12.	Is it an example of oxidation when food gets over burnt??
Answer» Is it an example of oxidation when food gets over burnt??

Discussion

13.	Which of the following elements have 6 electrons in their valence shell?
Answer» Which of the following elements have 6 electrons in their valence shell?

Discussion

14.	Two oxides of a metal (M) have 20.12% and 11.19% oxygen respectively. The formula of the first oxide is MO. Determine the formula of the second oxide.
Answer» Two oxides of a metal (M) have 20.12% and 11.19% oxygen respectively. The formula of the first oxide is MO. Determine the formula of the second oxide.

Discussion

15.	Given , Ag=108g, S=0.268g , O=0.538g . Find empirical formula of compound
Answer» Given , Ag=108g, S=0.268g , O=0.538g . Find empirical formula of compound

Discussion

16.	Why are the digestive enzymes called as hydrolases?
Answer» Why are the digestive enzymes called as hydrolases?

Discussion

17.	Two solutions A and B have pH values of 3.0 and 9.5. Which of these will turn blue litmus red and which will turn phenolphthalein from colourless to pink.
Answer» Two solutions A and B have pH values of 3.0 and 9.5. Which of these will turn blue litmus red and which will turn phenolphthalein from colourless to pink.

Discussion

18.	is backward reaction possible in irreversible reactions?
Answer» is backward reaction possible in irreversible reactions?

Discussion

19.	what is inorganic compound. what is unripened fruit. meaning of harness.
Answer» what is inorganic compound. what is unripened fruit. meaning of harness.

Discussion

20.	For the following question, the answer is an integer between 0 and 9 (both inclusive). In the Ellingham diagram for oxides, there are ___ lines for the reaction(s) between C and O.
Answer» For the following question, the answer is an integer between 0 and 9 (both inclusive). In the Ellingham diagram for oxides, there are ___ lines for the reaction(s) between C and O.

20.

For the following question, the answer is an integer between 0 and 9 (both inclusive). In the Ellingham diagram for oxides, there are ___ lines for the reaction(s) between C and O.

Answer»

For the following question, the answer is an integer between 0 and 9 (both inclusive).

In the Ellingham diagram for oxides, there are ___ lines for the reaction(s) between C and O.

Discussion

21.	(a) Acids dissolve in water and produce positively charged ions. Draw the structure of these positive ions. (b) Explain why Carbon tetrachloride does not dissolve in water. (c) Elements Q and S react together to form an ionic compound. Under normal conditions, which physical state will the compound QS exist in ? (d) Can Q and S, both be metals ? Justify your answer. (e) The property which is characteristic of an electrovalent compound is that : A. it is easily vaporized, B. it has a high melting point, C. it is a weak electrolyte, D. it often exists as a liquid. (f) When a metal atom becomes an ion : A. it loses electrons and is oxidized, B. it gains electrons and is reduced, C. it gains electrons and is oxidized, D. it loses electrons and is reduced.
Answer» (a) Acids dissolve in water and produce positively charged ions. Draw the structure of these positive ions. (b) Explain why Carbon tetrachloride does not dissolve in water. (c) Elements Q and S react together to form an ionic compound. Under normal conditions, which physical state will the compound QS exist in ? (d) Can Q and S, both be metals ? Justify your answer. (e) The property which is characteristic of an electrovalent compound is that : A. it is easily vaporized, B. it has a high melting point, C. it is a weak electrolyte, D. it often exists as a liquid. (f) When a metal atom becomes an ion : A. it loses electrons and is oxidized, B. it gains electrons and is reduced, C. it gains electrons and is oxidized, D. it loses electrons and is reduced.

21.

(a) Acids dissolve in water and produce positively charged ions. Draw the structure of these positive ions. (b) Explain why Carbon tetrachloride does not dissolve in water. (c) Elements Q and S react together to form an ionic compound. Under normal conditions, which physical state will the compound QS exist in ? (d) Can Q and S, both be metals ? Justify your answer. (e) The property which is characteristic of an electrovalent compound is that : A. it is easily vaporized, B. it has a high melting point, C. it is a weak electrolyte, D. it often exists as a liquid. (f) When a metal atom becomes an ion : A. it loses electrons and is oxidized, B. it gains electrons and is reduced, C. it gains electrons and is oxidized, D. it loses electrons and is reduced.

Answer»

(a) Acids dissolve in water and produce positively charged ions. Draw the structure of these positive ions.

(b) Explain why Carbon tetrachloride does not dissolve in water.

(c) Elements Q and S react together to form an ionic compound. Under normal conditions, which physical state will the compound QS exist in ?

(d) Can Q and S, both be metals ? Justify your answer.

(e) The property which is characteristic of an electrovalent compound is that :

A. it is easily vaporized,

B. it has a high melting point,

C. it is a weak electrolyte,

D. it often exists as a liquid.

(f) When a metal atom becomes an ion :

A. it loses electrons and is oxidized,

B. it gains electrons and is reduced,

C. it gains electrons and is oxidized,

D. it loses electrons and is reduced.

Discussion

22.	claisen schmidt reaction-explain
Answer» claisen schmidt reaction-explain

Discussion

23.	in the reaction4A+2B+3C=A4B2C3 the number of moles of product formed will be ,if starting from 2 moles of A ,1.2 moles of B and 1.44 moles of C
Answer» in the reaction4A+2B+3C=A4B2C3 the number of moles of product formed will be ,if starting from 2 moles of A ,1.2 moles of B and 1.44 moles of C

Discussion

24.	0.05 m ammonium hydroxide solution is dissolve in 0.001m ammonium chloride solution what will be the pH of OH- concentration of this solution?
Answer» 0.05 m ammonium hydroxide solution is dissolve in 0.001m ammonium chloride solution what will be the pH of OH- concentration of this solution?

Discussion

25.	reaction beteen copper and HNO_{
Answer» reaction beteen copper and HNO_{

Discussion

26.	What do you understand by bond pairs and lone pairs of electrons? Illustrate by giving one example of each type.
Answer» What do you understand by bond pairs and lone pairs of electrons? Illustrate by giving one example of each type.

Discussion

27.	A gas occupies 56 L at 1 atm and 273 K. the number of moles of the gas present is:
Answer» A gas occupies $56 L$ at 1 atm and $273 K$ . the number of moles of the gas present is:

Discussion

28.	A solution in which some more solute can be dissolved at any fixed temperature is called __ solution
Answer» A solution in which some more solute can be dissolved at any fixed temperature is called __ solution

Discussion

29.	Which of the following properties generally increases on moving from top to bottom in a group?
Answer» Which of the following properties generally increases on moving from top to bottom in a group?

Discussion

30.	State the five uses of Plaster of Paris.
Answer» State the five uses of Plaster of Paris.

Discussion

31.	How many ways the letters of the word CHEMISTRY be arranged? How many of these begin with M? (Without repeating the letters)
Answer» How many ways the letters of the word CHEMISTRY be arranged? How many of these begin with M? (Without repeating the letters)

Discussion

32.	Silicon (Si = 28) Forms a compound with chlorine (Cl = 35.5 ) in which 5.6 g of silicon combines with 21.3 g of chlorine. Calculate the empirical formula of the compound.
Answer» Silicon (Si = 28) Forms a compound with chlorine (Cl = 35.5 ) in which 5.6 g of silicon combines with 21.3 g of chlorine. Calculate the empirical formula of the compound.

Discussion

33.	5% of urea is added in 250 mL of water. Find molality.(Density= 1.19g/mL)
Answer» 5% of urea is added in 250 mL of water. Find molality.(Density= 1.19g/mL)

Discussion

34.	When an ammonium salt is warmed with sodium hydroxide solution, ammonia gas is evolved. State three ways by which you can identify this gas.
Answer» When an ammonium salt is warmed with sodium hydroxide solution, ammonia gas is evolved. State three ways by which you can identify this gas.

Discussion

35.	Question 1 A solution turns red litmus blue; its pH is likely to be: 1. 1 2. 4 3. 5 4. 10
Answer» Question 1 A solution turns red litmus blue; its pH is likely to be: 1. 1 2. 4 3. 5 4. 10

Discussion

36.	Why should curd or any sour substance not be kept in brass and copper vessels?
Answer» Why should curd or any sour substance not be kept in brass and copper vessels?

Discussion

37.	What happens when NaHCo3 exposed to air
Answer» What happens when NaHCo3 exposed to air

Discussion

38.	Which of the following statements is correct?
Answer» Which of the following statements is correct?

Discussion

39.	What is the count of carbons in a alkane chain having 20 hydrogen atoms.
Answer» What is the count of carbons in a alkane chain having 20 hydrogen atoms.

Discussion

40.	why is CO MOT diagram made according to nitrogen order( pi 2px2 =pi 2py2 , sigma 2pz2) and not according to oxygen? shouldn't oxygen dominate? how will we come to know in such cases?
Answer» why is CO MOT diagram made according to nitrogen order( pi 2px2 =pi 2py2 , sigma 2pz2) and not according to oxygen? shouldn't oxygen dominate? how will we come to know in such cases?

Discussion

41.	Presence of starch in a substance can be detected by the ___.
Answer» Presence of starch in a substance can be detected by the ___.

Discussion

42.	18. Assertion :- (CH3)3-C+ is more stable than (CD3)3-C+. Reason :- -CD3 has more +i effect than CH3.
Answer» 18. Assertion :- (CH3)3-C+ is more stable than (CD3)3-C+. Reason :- -CD3 has more +i effect than CH3.

Discussion

43.	IN HOW MANY ELEMENTS DOES THE OUTERMOST ELECTRONS HAS QUANTUM NUMBERS n=4 l=0 and m=1
Answer» IN HOW MANY ELEMENTS DOES THE OUTERMOST ELECTRONS HAS QUANTUM NUMBERS n=4 l=0 and m=1

Discussion

44.	Question 23Identify the reducing agent in the following reactions:(a) 4NH3+5O2→4NO+6H2O(b) H2O+F2→HF+HOF(c) Fe2O3+3CO→2Fe+3CO2(d) 2H2+O2→2H2O
Answer» Question 23 Identify the reducing agent in the following reactions: (a) $4 {NH}_{3} + 5 O_{2} \to 4 NO + 6 H_{2} O$ (b) $H_{2} O + F_{2} \to HF + HOF$ (c) ${Fe}_{2} O_{3} + 3 CO \to 2 Fe + 3 {CO}_{2}$ (d) $2 H_{2} + O_{2} \to 2 H_{2} O$

Discussion

45.	Complete the table : IndicatorNeutralAcidicAlkalineLimitusPurple........................PhenolphthaleinColourless...............
Answer» Complete the table : $\begin{matrix} Indicator & Neutral & A c i d i c & A l k a l i n e L i m i t u s & P u r p l e & . . . . . . . . . . . & . . . . . . . . . . . . . Phenolphthalein & Colourless & . . . . . . . & . . . . . . . . \end{matrix}$

45.

Complete the table : IndicatorNeutralAcidicAlkalineLimitusPurple........................PhenolphthaleinColourless...............

Answer»

Complete the table :

$\begin{matrix} Indicator & Neutral & A c i d i c & A l k a l i n e L i m i t u s & P u r p l e & . . . . . . . . . . . & . . . . . . . . . . . . . Phenolphthalein & Colourless & . . . . . . . & . . . . . . . . \end{matrix}$

Discussion

46.	N-factor of Fe0.95O when it converts into Fe2O3 1)0.9 2) 0.85 3)2/0.954 4)1.8
Answer» N-factor of Fe0.95O when it converts into Fe2O3 1)0.9 2) 0.85 3)2/0.954 4)1.8

Discussion

47.	heat of formation for explosive compound like NCl3 1.positive 2.negative 3.zero 4.no
Answer» heat of formation for explosive compound like NCl3 1.positive 2.negative 3.zero 4.no

Discussion

48.	The molar mass of Z is 20g. Find the mass of 1 atom of Z.
Answer» The molar mass of Z is 20g. Find the mass of 1 atom of Z.

Discussion

49.	Balance the following chemical equation:MnO2 + HCl → MnCl2 + Cl2 + H2O
Answer» Balance the following chemical equation: MnO₂+ HCl → MnCl₂ + Cl₂ + H₂O

Discussion

50.	Find the atomicity of ozone if its atomic mass is 16 and its molecular mass is 48.
Answer» Find the atomicity of ozone if its atomic mass is 16 and its molecular mass is 48.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Give the reactions of ethyne with(a) Hydrogen(b) Water(c) Bromine

an element whose atomic no is 112 . find the position in periodic table

Which of these is an odourless and colourless gas?

The number of structural and configurational isomers of a bromo compound, C5H9Br, formed by the addition of HBr to 2−pentyne respectively x and y. Find the value of x+y.

which of the following compound has all covalent, ionic, coordinate bond?a) NH4Clb)CaCl2c)K2SO4

31.At 27^° c, the combustion of ethane take place according to the reaction c2H2(g)+7/2O2(g)--> 2Co2(g) + 3H2o(l) Δ E-Δ H for thos reaction at 27^° C will be

Which of the following does not react with dilute sulphuric acid?

what is N type semiconductor?

3.65 g of HCL is present in 1 L of solution at 25 degrees celsius. If x L of water is added such that pH change by 1 unit at 25 degrees celsius, the value if x is (Assume no change in volume due to addition of acid in water

Buffer capacity of buffer containing acid with pKa = 4.75 will be highest. What is its pH value?

oxidation state of nitrogen in H-N ≡ C is options : (1) -4 (2) +3 (3) -3 (4) -2

Is it an example of oxidation when food gets over burnt??

Which of the following elements have 6 electrons in their valence shell?

Two oxides of a metal (M) have 20.12% and 11.19% oxygen respectively. The formula of the first oxide is MO. Determine the formula of the second oxide.

Given , Ag=108g, S=0.268g , O=0.538g . Find empirical formula of compound

Why are the digestive enzymes called as hydrolases?

Two solutions A and B have pH values of 3.0 and 9.5. Which of these will turn blue litmus red and which will turn phenolphthalein from colourless to pink.

is backward reaction possible in irreversible reactions?

what is inorganic compound. what is unripened fruit. meaning of harness.

For the following question, the answer is an integer between 0 and 9 (both inclusive). In the Ellingham diagram for oxides, there are ___ lines for the reaction(s) between C and O.

claisen schmidt reaction-explain

in the reaction4A+2B+3C=A4B2C3 the number of moles of product formed will be ,if starting from 2 moles of A ,1.2 moles of B and 1.44 moles of C

0.05 m ammonium hydroxide solution is dissolve in 0.001m ammonium chloride solution what will be the pH of OH- concentration of this solution?

reaction beteen copper and HNO_{

What do you understand by bond pairs and lone pairs of electrons? Illustrate by giving one example of each type.

A gas occupies 56 L at 1 atm and 273 K. the number of moles of the gas present is:

A solution in which some more solute can be dissolved at any fixed temperature is called __ solution

Which of the following properties generally increases on moving from top to bottom in a group?

State the five uses of Plaster of Paris.

How many ways the letters of the word CHEMISTRY be arranged? How many of these begin with M? (Without repeating the letters)

Silicon (Si = 28) Forms a compound with chlorine (Cl = 35.5 ) in which 5.6 g of silicon combines with 21.3 g of chlorine. Calculate the empirical formula of the compound.

5% of urea is added in 250 mL of water. Find molality.(Density= 1.19g/mL)

When an ammonium salt is warmed with sodium hydroxide solution, ammonia gas is evolved. State three ways by which you can identify this gas.

Question 1 A solution turns red litmus blue; its pH is likely to be: 1. 1 2. 4 3. 5 4. 10

Why should curd or any sour substance not be kept in brass and copper vessels?

What happens when NaHCo3 exposed to air

Which of the following statements is correct?

What is the count of carbons in a alkane chain having 20 hydrogen atoms.

why is CO MOT diagram made according to nitrogen order( pi 2px2 =pi 2py2 , sigma 2pz2) and not according to oxygen? shouldn't oxygen dominate? how will we come to know in such cases?

Presence of starch in a substance can be detected by the ___.

18. Assertion :- (CH3)3-C+ is more stable than (CD3)3-C+. Reason :- -CD3 has more +i effect than CH3.

IN HOW MANY ELEMENTS DOES THE OUTERMOST ELECTRONS HAS QUANTUM NUMBERS n=4 l=0 and m=1

Question 23Identify the reducing agent in the following reactions:(a) 4NH3+5O2→4NO+6H2O(b) H2O+F2→HF+HOF(c) Fe2O3+3CO→2Fe+3CO2(d) 2H2+O2→2H2O

Complete the table : IndicatorNeutralAcidicAlkalineLimitusPurple........................PhenolphthaleinColourless...............

N-factor of Fe0.95O when it converts into Fe2O3 1)0.9 2) 0.85 3)2/0.954 4)1.8

heat of formation for explosive compound like NCl3 1.positive 2.negative 3.zero 4.no

The molar mass of Z is 20g. Find the mass of 1 atom of Z.

Balance the following chemical equation:MnO2 + HCl → MnCl2 + Cl2 + H2O

Find the atomicity of ozone if its atomic mass is 16 and its molecular mass is 48.