15280 + Interview Questions in Chemistry Page 145 InterviewSolution

7201.	Q 7/30 Among the following, the surfactant that will form micelles in aqueous solution at the lowest molarconcentration at ambient condition isCH3(CH2)15 N(CH3)3 BrCH3(CH2)11 N(CH3)3 BrCH3(CH2)6 CO0 NaCH3(CH2)11 0sO3 Na
Answer» Q 7/30 Among the following, the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient condition is CH3(CH2)15 N(CH3)3 Br CH3(CH2)11 N(CH3)3 Br CH3(CH2)6 CO0 Na CH3(CH2)11 0sO3 Na

Discussion

7202.	ntwhen a conducting soap bubble is negatively charged then why it expands.n
Answer» ntwhen a conducting soap bubble is negatively charged then why it expands.n

Discussion

7203.	Identify the acid and base used in the formation of the following salts. a. SODIUM ACETATE b. SODIUM HYDROGEN CARBONATE c. ALUMINIUM CHLORIDE d. POTASSIUM CHLORIDE
Answer» Identify the acid and base used in the formation of the following salts. a. SODIUM ACETATE b. SODIUM HYDROGEN CARBONATE c. ALUMINIUM CHLORIDE d. POTASSIUM CHLORIDE

7203.

Identify the acid and base used in the formation of the following salts. a. SODIUM ACETATE b. SODIUM HYDROGEN CARBONATE c. ALUMINIUM CHLORIDE d. POTASSIUM CHLORIDE

Answer»

Identify the acid and base used in the formation of the following salts.

a. SODIUM ACETATE

b. SODIUM HYDROGEN CARBONATE

c. ALUMINIUM CHLORIDE

d. POTASSIUM CHLORIDE

Discussion

7204.	(i) Why should curd and sour substance not be kept in brass and copper vessels?(ii) What are the differences between the properties of acids and bases?
Answer» (i) Why should curd and sour substance not be kept in brass and copper vessels? (ii) What are the differences between the properties of acids and bases?

7204.

(i) Why should curd and sour substance not be kept in brass and copper vessels?(ii) What are the differences between the properties of acids and bases?

Answer»

(i) Why should curd and sour substance not be kept in brass and copper vessels?

(ii) What are the differences between the properties of acids and bases?

Discussion

7205.	Question 14Paheli wants to deposit silver on an iron spoon. She took silver nitrate (AgNO3) solution in a beaker and set up a simple circuit for electroplating. Which terminal of the battery should the spoon be connected to? What material should the other electrode be made of?
Answer» Question 14 Paheli wants to deposit silver on an iron spoon. She took silver nitrate $(A g N O_{3})$ solution in a beaker and set up a simple circuit for electroplating. Which terminal of the battery should the spoon be connected to? What material should the other electrode be made of?

Discussion

7206.	41. SO2 + 2H2S ---> 3S + 2H2O 2moles of H2S and 11.2L SO2 at NTP react to form x mole of sulphur , X is:
Answer» 41. SO2 + 2H2S ---> 3S + 2H2O 2moles of H2S and 11.2L SO2 at NTP react to form x mole of sulphur , X is:

Discussion

7207.	Name the products formed when a small amount of KOH solution is added to the ZnSO4 solution.
Answer» Name the products formed when a small amount of KOH solution is added to the $Z n S O_{4}$ solution.

Discussion

7208.	Specify the number of carbon atoms present in parent chain in the following compound. 6
Answer» Specify the number of carbon atoms present in parent chain in the following compound. 6

Discussion

7209.	In each of the following pairs, choose the atom having the bigger size :(a) Mg (Atomic number = 12) or Cl (Atomic number = 17)(b) Na (Atomic number = 11) or K (Atomic number = 19)
Answer» In each of the following pairs, choose the atom having the bigger size : (a) Mg (Atomic number = 12) or Cl (Atomic number = 17) (b) Na (Atomic number = 11) or K (Atomic number = 19)

7209.

In each of the following pairs, choose the atom having the bigger size :(a) Mg (Atomic number = 12) or Cl (Atomic number = 17)(b) Na (Atomic number = 11) or K (Atomic number = 19)

Answer»

In each of the following pairs, choose the atom having the bigger size :

(a) Mg (Atomic number = 12) or Cl (Atomic number = 17)

(b) Na (Atomic number = 11) or K (Atomic number = 19)

Discussion

7210.	Lewis dot structure of NH4+ ion
Answer» Lewis dot structure of NH4+ ion

Discussion

7211.	Write the number of valence electrons for the following atoms. Carbon (C) Phosphorus (P) Potassium (K) Oxygen (O)
Answer» Write the number of valence electrons for the following atoms. Carbon (C) Phosphorus (P) Potassium (K) Oxygen (O)

Discussion

7212.	Number of molecules in 44 mg of N2O.
Answer» Number of molecules in 44 mg of $N_{2} O$ .

Discussion

7213.	Name the chemical used for drying ammonia
Answer» Name the chemical used for drying ammonia

Discussion

7214.	28. Solute A is ternary electrolyte and solute B is non electrolyte.if 0.1 m solution of solute B produces an osmotic pressure 2p then 0.05 m solution A at the same temperature will produce osmotic pressure equal to
Answer» 28. Solute A is ternary electrolyte and solute B is non electrolyte.if 0.1 m solution of solute B produces an osmotic pressure 2p then 0.05 m solution A at the same temperature will produce osmotic pressure equal to

Discussion

7215.	31. Electron affinity of Chlorine is greater than that of Fluorine. But electronegativity of Fluorine is greater than that of Chlorine. Why?
Answer» 31. Electron affinity of Chlorine is greater than that of Fluorine. But electronegativity of Fluorine is greater than that of Chlorine. Why?

Discussion

7216.	25. All the substances listed below are fertilizers that contribute nitrogen to soil. Which of these is the richest source of nitrogen on a mass percentage basis?(Problems in physical chemistry by narendra avasthi, page - 14) A. Urea B. Ammonium nitrate C. Nitric Oxide D. Ammonia
Answer» 25. All the substances listed below are fertilizers that contribute nitrogen to soil. Which of these is the richest source of nitrogen on a mass percentage basis?(Problems in physical chemistry by narendra avasthi, page - 14) A. Urea B. Ammonium nitrate C. Nitric Oxide D. Ammonia

Discussion

7217.	Find out from the following elements that do not react with hot as well as cold water.Sodium, Potassium, Zinc and Iron.
Answer» Find out from the following elements that do not react with hot as well as cold water. Sodium, Potassium, Zinc and Iron.

Discussion

7218.	(c) Write balanced equations for the following reactions:(i) dissolving sulphur trioxide in water.(ii) Aluminium powder is warmed with hot and concentrated caustic soda solution.(iii) Concentrated nitric acid is added to copper turnings kept in a beaker.(iv) Red lead (trilead tetroxide) is warmed with concentrated hydrochloric acid.
Answer» (c) Write balanced equations for the following reactions: (i) dissolving sulphur trioxide in water. (ii) Aluminium powder is warmed with hot and concentrated caustic soda solution. (iii) Concentrated nitric acid is added to copper turnings kept in a beaker. (iv) Red lead (trilead tetroxide) is warmed with concentrated hydrochloric acid.

Discussion

7219.	7. When copper is treated with a certain concentration of nitic acid, nitic oxide and nitroght dioxide are liberated in equal volumes according the equation {xCu+yHNO_3→ Cu(NO_3)_2+NO+NO_2+H_2O{ The coefficients x and y are
Answer» 7. When copper is treated with a certain concentration of nitic acid, nitic oxide and nitroght dioxide are liberated in equal volumes according the equation {xCu+yHNO_3→ Cu(NO_3)_2+NO+NO_2+H_2O{ The coefficients x and y are

Discussion

7220.	2. Amongst the given compounds, choose the one in which all the atoms are in one plane in all the possible conformations
Answer» 2. Amongst the given compounds, choose the one in which all the atoms are in one plane in all the possible conformations

Discussion

7221.	18.4 g of hydrogen reacts with 20 g of oxygen to formwater. The mass of water formed is(1) 24 g(3) 22.5 g(2) 36 g(4) 40 g
Answer» 18.4 g of hydrogen reacts with 20 g of oxygen to formwater. The mass of water formed is(1) 24 g(3) 22.5 g(2) 36 g(4) 40 g

Discussion

7222.	When a chemical change takes place with the release of heat energy, it is said to be a/an _______ reaction.
Answer» When a chemical change takes place with the release of heat energy, it is said to be a/an _______ reaction.

Discussion

7223.	What is meant by "brittleness"? Which type of elements usually show brittleness: metals or non-metals?
Answer» What is meant by "brittleness"? Which type of elements usually show brittleness: metals or non-metals?

Discussion

7224.	Sponge is easily compressible. Is it a solid?
Answer» Sponge is easily compressible. Is it a solid?

Discussion

7225.	78. If 1 mL of water contains 20 drops then number ofmolecules in one drop of water is(a) 6.023 x 1023 molecules(b) 1.376 x 1026 molecules(c1.344 x 10 molecules(d) 4.346 x 1020 molecules
Answer» 78. If 1 mL of water contains 20 drops then number ofmolecules in one drop of water is(a) 6.023 x 1023 molecules(b) 1.376 x 1026 molecules(c1.344 x 10 molecules(d) 4.346 x 1020 molecules

Discussion

7226.	The chemical name of laughing gas is
Answer» The chemical name of laughing gas is

Discussion

7227.	(a) What happens when carbon burns in air? Write the chemical equation of the reaction which takes place. (b) Why are coal and petroleum called fossil fuels? (c) Explain how coal was formed in the earth. (d) Describe how petroleum was formed in the earth. (e) Name a fossil fuel other than coal and petroleum.
Answer» (a) What happens when carbon burns in air? Write the chemical equation of the reaction which takes place. (b) Why are coal and petroleum called fossil fuels? (c) Explain how coal was formed in the earth. (d) Describe how petroleum was formed in the earth. (e) Name a fossil fuel other than coal and petroleum.

Discussion

7228.	27. Which conformational isomer of ethylene glycol is most stable
Answer» 27. Which conformational isomer of ethylene glycol is most stable

Discussion

7229.	Explain blast furnace.
Answer» Explain blast furnace.

Discussion

7230.	If 1 volume of H2 reacts with 1 volume of O2 to form 1 volume of H20. Then when 4 L of H2 & 3.2 L of O2 will be mixed. What will be the composition by volume of the remaining unreacted gaseous mixture?
Answer» If 1 volume of H₂ reacts with 1 volume of O₂ to form 1 volume of H₂0. Then when 4 L of H₂ & 3.2 L of O₂ will be mixed. What will be the composition by volume of the remaining unreacted gaseous mixture?

Discussion

7231.	Is the 'baking soda' used in baking bread and cake an acid, a base or a salt? What is its chemical name and formula?
Answer» Is the 'baking soda' used in baking bread and cake an acid, a base or a salt? What is its chemical name and formula?

Discussion

7232.	A sample of ammonium phosphate (NH4)3PO4 contains 3.18 moles of hydrogen atoms. The number of moles of oxygen atoms in the sample is 1) 0.265 2) 0.795 3) 1.06 4) 4.00
Answer» A sample of ammonium phosphate (NH4)3PO4 contains 3.18 moles of hydrogen atoms. The number of moles of oxygen atoms in the sample is 1) 0.265 2) 0.795 3) 1.06 4) 4.00

Discussion

7233.	State the purpose of liquefying the ammonia produced in the Haber’s process.
Answer» State the purpose of liquefying the ammonia produced in the Haber’s process.

Discussion

7234.	Why 12 molecules of water used in photosynthesis equation?
Answer» Why 12 molecules of water used in photosynthesis equation?

Discussion

7235.	which of the following has three different stereoisomers. (1) 1,3-butadiene (2) 2,4-hexadiene (3) 2,5-hexadiene (4) 2,4-heptadiene
Answer» which of the following has three different stereoisomers. (1) 1,3-butadiene (2) 2,4-hexadiene (3) 2,5-hexadiene (4) 2,4-heptadiene

Discussion

7236.	Alkali metals reacts with liquid ammonia they given blue colour or copper bronze How will we know that the solution will be blue or copper bronze
Answer» Alkali metals reacts with liquid ammonia they given blue colour or copper bronze How will we know that the solution will be blue or copper bronze

Discussion

7237.	Select the molecule in which the central atom has incomplete octet.
Answer» Select the molecule in which the central atom has incomplete octet.

Discussion

7238.	Question 9Which of the following are not ionic compounds?(i) KCl(ii) HCl(iii) CCl4(iv) NaCl(a) (i) and (ii)(b) (ii) and (iii)(c) (iii) and (iv)(d) (i) and (iii)
Answer» Question 9 Which of the following are not ionic compounds? (i) $KCl$ (ii) $HCl$ (iii) ${CCl}_{4}$ (iv) $NaCl$ (a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (i) and (iii)

Discussion

7239.	Define non-metals. Give five examples of non-metals.
Answer» Define non-metals. Give five examples of non-metals.

Discussion

7240.	When benzaldehyde is oxidised to give benzoicacid then the oxidation state of carbon of aldehydicgroup is changed from(1) +2 to +3(3) Zero to +2(2) +1 to +3(4) No change
Answer» When benzaldehyde is oxidised to give benzoicacid then the oxidation state of carbon of aldehydicgroup is changed from(1) +2 to +3(3) Zero to +2(2) +1 to +3(4) No change

Discussion

7241.	81.a piece of wax weighs 18.03g in air. a piece of metal is found to weigh 17.3g in water . it is tied to the wax and both together weigh 15.23g in water . then ,the specific gravity of wax is
Answer» 81.a piece of wax weighs 18.03g in air. a piece of metal is found to weigh 17.3g in water . it is tied to the wax and both together weigh 15.23g in water . then ,the specific gravity of wax is

Discussion

7242.	In the laboratory preparation of hydrochloric acid, HCl gas is dissolved in water.(i) Draw a diagram to show the arrangement used for the absorption of HCl in water.(ii) Why is such an arrangement necessary? Give two reasons.(iii) Write the chemical equation for the laboratory preparation of HCl gas when the reactants are:(a) below 200°C(b) above 200°C
Answer» In the laboratory preparation of hydrochloric acid, HCl gas is dissolved in water. (i) Draw a diagram to show the arrangement used for the absorption of HCl in water. (ii) Why is such an arrangement necessary? Give two reasons. (iii) Write the chemical equation for the laboratory preparation of HCl gas when the reactants are: (a) below 200°C (b) above 200°C

Discussion

7243.	assertion -ionic bond is non directional.Reason - each ion is surrounded by a uniformly distributed electric field .what does the reason statement mean
Answer» assertion -ionic bond is non directional.Reason - each ion is surrounded by a uniformly distributed electric field .what does the reason statement mean

Discussion

7244.	How many structural isomers can be obtained by monochlorination of
Answer» How many structural isomers can be obtained by monochlorination of

Discussion

7245.	How many lone pairs,sigma and pie bonds are present in the structure of HCN and HNC
Answer» How many lone pairs,sigma and pie bonds are present in the structure of HCN and HNC

Discussion

7246.	What is glacial acetic acid ? What is its melting point ?
Answer» What is glacial acetic acid ? What is its melting point ?

Discussion

7247.	Complete the following reaction:2NaOH(aq)+H2SO4(aq)→
Answer» Complete the following reaction: $2 NaOH (aq) + H_{2} {SO}_{4} (aq) \to$

Discussion

7248.	24. Why does 1-chloropentane has higher boiling point than 2-chloropentane and 3-chloropentane?
Answer» 24. Why does 1-chloropentane has higher boiling point than 2-chloropentane and 3-chloropentane?

Discussion

7249.	CO2(g) + H2(g) → CO(g) + H2O(g)In the above reaction, is the oxidising agent.
Answer» ${CO}_{2} (g) + H_{2} (g) \to CO (g) + H_{2} O (g)$ In the above reaction, is the oxidising agent.

Discussion

7250.	Fe+S when heated forms a black mass in which when dilute HCl (hydrochloric acid) is added forms which gas and compound
Answer» Fe+S when heated forms a black mass in which when dilute HCl (hydrochloric acid) is added forms which gas and compound

Discussion

Explore topic-wise InterviewSolutions in .

Q 7/30 Among the following, the surfactant that will form micelles in aqueous solution at the lowest molarconcentration at ambient condition isCH3(CH2)15 N*(CH3)3 BrCH3(CH2)11 N*(CH3)3 BrCH3(CH2)6 CO0 NaCH3(CH2)11 0sO3 Na

ntwhen a conducting soap bubble is negatively charged then why it expands.n

Identify the acid and base used in the formation of the following salts. a. SODIUM ACETATE b. SODIUM HYDROGEN CARBONATE c. ALUMINIUM CHLORIDE d. POTASSIUM CHLORIDE

(i) Why should curd and sour substance not be kept in brass and copper vessels?(ii) What are the differences between the properties of acids and bases?

Question 14Paheli wants to deposit silver on an iron spoon. She took silver nitrate (AgNO3) solution in a beaker and set up a simple circuit for electroplating. Which terminal of the battery should the spoon be connected to? What material should the other electrode be made of?

41. SO2 + 2H2S ---> 3S + 2H2O 2moles of H2S and 11.2L SO2 at NTP react to form x mole of sulphur , X is:

Name the products formed when a small amount of KOH solution is added to the ZnSO4 solution.

Specify the number of carbon atoms present in parent chain in the following compound. 6

In each of the following pairs, choose the atom having the bigger size :(a) Mg (Atomic number = 12) or Cl (Atomic number = 17)(b) Na (Atomic number = 11) or K (Atomic number = 19)

Lewis dot structure of NH4+ ion

Write the number of valence electrons for the following atoms. Carbon (C) Phosphorus (P) Potassium (K) Oxygen (O)

Number of molecules in 44 mg of N2O.

Name the chemical used for drying ammonia

28. Solute A is ternary electrolyte and solute B is non electrolyte.if 0.1 m solution of solute B produces an osmotic pressure 2p then 0.05 m solution A at the same temperature will produce osmotic pressure equal to

31. Electron affinity of Chlorine is greater than that of Fluorine. But electronegativity of Fluorine is greater than that of Chlorine. Why?

25. All the substances listed below are fertilizers that contribute nitrogen to soil. Which of these is the richest source of nitrogen on a mass percentage basis?(Problems in physical chemistry by narendra avasthi, page - 14) A. Urea B. Ammonium nitrate C. Nitric Oxide D. Ammonia

Find out from the following elements that do not react with hot as well as cold water.Sodium, Potassium, Zinc and Iron.

7. When copper is treated with a certain concentration of nitic acid, nitic oxide and nitroght dioxide are liberated in equal volumes according the equation {xCu+yHNO_3→ Cu(NO_3)_2+NO+NO_2+H_2O{ The coefficients x and y are

2. Amongst the given compounds, choose the one in which all the atoms are in one plane in all the possible conformations

18.4 g of hydrogen reacts with 20 g of oxygen to formwater. The mass of water formed is(1) 24 g(3) 22.5 g(2) 36 g(4) 40 g

When a chemical change takes place with the release of heat energy, it is said to be a/an _______ reaction.

What is meant by "brittleness"? Which type of elements usually show brittleness: metals or non-metals?

Sponge is easily compressible. Is it a solid?

78. If 1 mL of water contains 20 drops then number ofmolecules in one drop of water is(a) 6.023 x 1023 molecules(b) 1.376 x 1026 molecules(c1.344 x 10 molecules(d) 4.346 x 1020 molecules

The chemical name of laughing gas is

27. Which conformational isomer of ethylene glycol is most stable

Explain blast furnace.

If 1 volume of H2 reacts with 1 volume of O2 to form 1 volume of H20. Then when 4 L of H2 &amp; 3.2 L of O2 will be mixed. What will be the composition by volume of the remaining unreacted gaseous mixture?

Is the 'baking soda' used in baking bread and cake an acid, a base or a salt? What is its chemical name and formula?

A sample of ammonium phosphate (NH4)3PO4 contains 3.18 moles of hydrogen atoms. The number of moles of oxygen atoms in the sample is 1) 0.265 2) 0.795 3) 1.06 4) 4.00

State the purpose of liquefying the ammonia produced in the Haber’s process.

Why 12 molecules of water used in photosynthesis equation?

which of the following has three different stereoisomers. (1) 1,3-butadiene (2) 2,4-hexadiene (3) 2,5-hexadiene (4) 2,4-heptadiene

Alkali metals reacts with liquid ammonia they given blue colour or copper bronze How will we know that the solution will be blue or copper bronze

Select the molecule in which the central atom has incomplete octet.

Question 9Which of the following are not ionic compounds?(i) KCl(ii) HCl(iii) CCl4(iv) NaCl(a) (i) and (ii)(b) (ii) and (iii)(c) (iii) and (iv)(d) (i) and (iii)

Define non-metals. Give five examples of non-metals.

When benzaldehyde is oxidised to give benzoicacid then the oxidation state of carbon of aldehydicgroup is changed from(1) +2 to +3(3) Zero to +2(2) +1 to +3(4) No change

81.a piece of wax weighs 18.03g in air. a piece of metal is found to weigh 17.3g in water . it is tied to the wax and both together weigh 15.23g in water . then ,the specific gravity of wax is

assertion -ionic bond is non directional.Reason - each ion is surrounded by a uniformly distributed electric field .what does the reason statement mean

How many structural isomers can be obtained by monochlorination of

How many lone pairs,sigma and pie bonds are present in the structure of HCN and HNC

What is glacial acetic acid ? What is its melting point ?

Complete the following reaction:2NaOH(aq)+H2SO4(aq)→

24. Why does 1-chloropentane has higher boiling point than 2-chloropentane and 3-chloropentane?

CO2(g) + H2(g) → CO(g) + H2O(g)In the above reaction, is the oxidising agent.

Fe+S when heated forms a black mass in which when dilute HCl (hydrochloric acid) is added forms which gas and compound

Q 7/30 Among the following, the surfactant that will form micelles in aqueous solution at the lowest molarconcentration at ambient condition isCH3(CH2)15 N(CH3)3 BrCH3(CH2)11 N(CH3)3 BrCH3(CH2)6 CO0 NaCH3(CH2)11 0sO3 Na

If 1 volume of H2 reacts with 1 volume of O2 to form 1 volume of H20. Then when 4 L of H2 & 3.2 L of O2 will be mixed. What will be the composition by volume of the remaining unreacted gaseous mixture?