15280 + Interview Questions in Chemistry Page 262 InterviewSolution

13051.	Nitrogen molecule contains a ______ bond.
Answer» Nitrogen molecule contains a ______ bond.

Discussion

13052.	Soaps are:
Answer» Soaps are:

Discussion

13053.	Ethene, with the molecular formula C2H6, has
Answer» Ethene, with the molecular formula $C_{2} H_{6}$ , has

Discussion

13054.	What is the atomicity of calcium
Answer» What is the atomicity of calcium

Discussion

13055.	Magnesium + Cold water → ___
Answer» Magnesium + Cold water $\to$ ___

Discussion

13056.	Why do elements combine?
Answer» Why do elements combine?

Discussion

13057.	Identify X in the following reaction. NaCl + H2O + CO2 + NH3 → NH4Cl + X. Identify X from the following options.
Answer» Identify $X$ in the following reaction. $N a C l + H_{2} O + C O_{2} + N H_{3}$ $\to$ $N H_{4} C l + X$ . Identify $X$ from the following options.

Discussion

13058.	An element has an electronic configuration of 2, 8, 8. So based on this information, the element X is a
Answer» An element has an electronic configuration of 2, 8, 8. So based on this information, the element X is a

Discussion

13059.	What happens when Aluminium reacts with sodium hydroxide?
Answer» What happens when Aluminium reacts with sodium hydroxide?

Discussion

13060.	CH3−CH2−C\|CH3=CH−CH2−CH3\|CH−CH2−CH3 What is the IUPAC name of the following compound?
Answer» $C H_{3} - C H_{2} - C \| C H_{3} = C H - C H_{2} - C H_{3} \| C H - C H_{2} - C H_{3}$ What is the IUPAC name of the following compound?

13060.

CH3−CH2−C|CH3=CH−CH2−CH3|CH−CH2−CH3 What is the IUPAC name of the following compound?

Answer»

$C H_{3} - C H_{2} - C | C H_{3} = C H - C H_{2} - C H_{3} | C H - C H_{2} - C H_{3}$

What is the IUPAC name of the following compound?

Discussion

13061.	If copper metal is heated over a flame it develops a coating. What is the colour and composition of coating.
Answer» If copper metal is heated over a flame it develops a coating. What is the colour and composition of coating.

Discussion

13062.	difference between endothermic and exothermic reaction diff between displacement and double displacment
Answer» difference between endothermic and exothermic reaction diff between displacement and double displacment

13062.

difference between endothermic and exothermic reaction diff between displacement and double displacment

Answer»

difference between endothermic and exothermic reaction

diff between displacement and double displacment

Discussion

13063.	Why silver mirror test is only for aldehydes and Ketons?
Answer» Why silver mirror test is only for aldehydes and Ketons?

Discussion

13064.	Balance the following equations a)Pb(NO3)2 gives PbO +NO2+O2 b)NH3+CuO gives Cu+N2+H2O c)NaOH+H2SO4 gives Na2SO4 +H2O d)Al4C3+H2O gives CH4+Al(OH)3
Answer» Balance the following equations a)Pb(NO₃)₂ gives PbO +NO₂+O₂ b)NH₃+CuO gives Cu+N₂+H₂O c)NaOH+H₂SO₄ gives Na₂SO₄ +H₂O d)Al₄C₃+H₂O gives CH₄+Al(OH)₃

13064.

Balance the following equations a)Pb(NO3)2 gives PbO +NO2+O2 b)NH3+CuO gives Cu+N2+H2O c)NaOH+H2SO4 gives Na2SO4 +H2O d)Al4C3+H2O gives CH4+Al(OH)3

Answer»

Balance the following equations

a)Pb(NO₃)₂ gives PbO +NO₂+O₂

b)NH₃+CuO gives Cu+N₂+H₂O

c)NaOH+H₂SO₄ gives Na₂SO₄ +H₂O

d)Al₄C₃+H₂O gives CH₄+Al(OH)₃

Discussion

13065.	Write the names and chemical formula of the products formed by the action of chlorine on slaked lime.
Answer» Write the names and chemical formula of the products formed by the action of chlorine on slaked lime.

Discussion

13066.	Q..1.. Name the natural source each of the following acids. a. Citric acid b. Oxalic acid c. Lactic acid d. Tartaric acid Q..2.. explain the action of dilute hydrochloric acid on the following with chemical equations A. Magnesium ribbon .B. sodium hydroxide C. Crushed egg shell.
Answer» Q..1.. Name the natural source each of the following acids. a. Citric acid b. Oxalic acid c. Lactic acid d. Tartaric acid Q..2.. explain the action of dilute hydrochloric acid on the following with chemical equations A. Magnesium ribbon .B. sodium hydroxide C. Crushed egg shell.

13066.

Q..1.. Name the natural source each of the following acids. a. Citric acid b. Oxalic acid c. Lactic acid d. Tartaric acid Q..2.. explain the action of dilute hydrochloric acid on the following with chemical equations A. Magnesium ribbon .B. sodium hydroxide C. Crushed egg shell.

Answer»

Q..1.. Name the natural source each of the following acids.

a. Citric acid b. Oxalic acid c. Lactic acid d. Tartaric acid

Q..2.. explain the action of dilute hydrochloric acid on the following with chemical equations

A. Magnesium ribbon .B. sodium hydroxide C. Crushed egg shell.

Discussion

13067.	Name the three compounds of calcium which are used in daily life and write one important use in each case.
Answer» Name the three compounds of calcium which are used in daily life and write one important use in each case.

Discussion

13068.	(a) Giving their structures, state the number of single bonds, double bonds and triple bonds (if any) in the following compounds : (i) ethyne (ii) ethene (iii) benzene (b) Write the molecular formula and structure of cyclohexane. How many covalent bonds are there in a molecule of cyclohexane?
Answer» (a) Giving their structures, state the number of single bonds, double bonds and triple bonds (if any) in the following compounds : (i) ethyne (ii) ethene (iii) benzene (b) Write the molecular formula and structure of cyclohexane. How many covalent bonds are there in a molecule of cyclohexane?

Discussion

13069.	CH4 and C2H6 form a homologous series, they differ by:
Answer» $C H_{4}$ and $C_{2} H_{6}$ form a homologous series, they differ by:

Discussion

13070.	Any undesirable change in the physical, chemical or biological characteristics of air, land and water that affect human life adversely is called__.
Answer» Any undesirable change in the physical, chemical or biological characteristics of air, land and water that affect human life adversely is called__.

Discussion

13071.	What is/are the produts formed when manganese is treated with 1% nitric acid?
Answer» What is/are the produts formed when manganese is treated with 1% nitric acid?

Discussion

13072.	4.5 moles of calcium carbonate are reacted with dilute hydrochloric acid. What is the mass of 4.5 moles of calcium carbonate? (Relative molecular mass of calcium carbonate is 100).
Answer» 4.5 moles of calcium carbonate are reacted with dilute hydrochloric acid. What is the mass of 4.5 moles of calcium carbonate? (Relative molecular mass of calcium carbonate is 100).

13072.

4.5 moles of calcium carbonate are reacted with dilute hydrochloric acid. What is the mass of 4.5 moles of calcium carbonate? (Relative molecular mass of calcium carbonate is 100).

Answer»

4.5 moles of calcium carbonate are reacted with dilute hydrochloric acid.

What is the mass of 4.5 moles of calcium carbonate? (Relative molecular mass of calcium carbonate is 100).

Discussion

13073.	The ionic compound Ca(OH)2 on dissociation will give a cation X. The charge on this on cation is ___.
Answer» The ionic compound $C a (O H)_{2}$ on dissociation will give a cation X. The charge on this on cation is ___.

Discussion

13074.	Barium chloride crystals contain 14.8% water of crystallisation. Find the number of molecules of water of crystallisation per molecule.
Answer» Barium chloride crystals contain 14.8% water of crystallisation. Find the number of molecules of water of crystallisation per molecule.

Discussion

13075.	Valency of aluminium is:
Answer» Valency of aluminium is:

Discussion

13076.	Calamine ore can be converted into zince oxide by the process of: (a) roasting (b) hydrogenation (c) chlorination (d) calcination
Answer» Calamine ore can be converted into zince oxide by the process of: (a) roasting (b) hydrogenation (c) chlorination (d) calcination

Discussion

13077.	Which of the following statement is correct in regard to the classification of elements? (a) Elements in the modern periodic table are arranged on the basis of increasing atomic numbers (b) Elements in Mendeleev’s periodic table are arranged on the basis of increasing atomic numbers (c) In the modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass. (d) In the modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.
Answer» Which of the following statement is correct in regard to the classification of elements? (a) Elements in the modern periodic table are arranged on the basis of increasing atomic numbers (b) Elements in Mendeleev’s periodic table are arranged on the basis of increasing atomic numbers (c) In the modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass. (d) In the modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.

13077.

Which of the following statement is correct in regard to the classification of elements? (a) Elements in the modern periodic table are arranged on the basis of increasing atomic numbers (b) Elements in Mendeleev’s periodic table are arranged on the basis of increasing atomic numbers (c) In the modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass. (d) In the modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.

Answer»

Which of the following statement is correct in regard to the classification of elements?

(a) Elements in the modern periodic table are arranged on the basis of increasing atomic numbers

(b) Elements in Mendeleev’s periodic table are arranged on the basis of increasing atomic numbers

(c) In the modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.

(d) In the modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.

Discussion

13078.	___ has higher pH value. (Dilute HCl or Concentrated HCl)
Answer» ___ has higher pH value. (Dilute HCl or Concentrated HCl)

Discussion

13079.	Water of crystallisation is the
Answer» Water of crystallisation is the

Discussion

13080.	Which of the following is/are correct regarding ionic compounds?
Answer» Which of the following is/are correct regarding ionic compounds?

Discussion

13081.	10 dm3 of N2 gas and 10 dm3 of gas X at the same temperature contain the same number of molecules. The gas X is
Answer» $10 d m^{3}$ of $N_{2}$ gas and $10 d m^{3}$ of gas X at the same temperature contain the same number of molecules. The gas X is

Discussion

13082.	If NaCl is doped with then the concentration of cation vacancies will be
Answer» If NaCl is doped with then the concentration of cation vacancies will be

Discussion

13083.	Which one term in the following includes the others? air, flora, fauna, environment, water, sunlight, soil
Answer» Which one term in the following includes the others? air, flora, fauna, environment, water, sunlight, soil

Discussion

13084.	(a) Define decomposers. Name one decomposer. (b) What is the role of decomposers in the ecosystem?
Answer» (a) Define decomposers. Name one decomposer. (b) What is the role of decomposers in the ecosystem?

13084.

(a) Define decomposers. Name one decomposer. (b) What is the role of decomposers in the ecosystem?

Answer»

(a) Define decomposers. Name one decomposer.

(b) What is the role of decomposers in the ecosystem?

Discussion

13085.	For a reversible system, when the concentration of the reacting system in equilibrium is increased then
Answer» For a reversible system, when the concentration of the reacting system in equilibrium is increased then

Discussion

13086.	Ammonium nitrate decomposes on heating.
Answer» Ammonium nitrate decomposes on heating.

Discussion

13087.	A metal salt (M) on reacting with sodium hydroxide forms sodium sulphate and a gelatinous white precipitate of a metal hydroxide. The precipitate is soluble in excess of sodium hydroxide. Identify M.
Answer» A metal salt (M) on reacting with sodium hydroxide forms sodium sulphate and a gelatinous white precipitate of a metal hydroxide. The precipitate is soluble in excess of sodium hydroxide. Identify M.

Discussion

13088.	Balance the following equation by short-cut method, and write the coefficient for O2 C5H11NH2+O2→CO2+H2O+NO2 ___
Answer» Balance the following equation by short-cut method, and write the coefficient for $O_{2}$ $C_{5} H_{11} N H_{2} + O_{2} \to C O_{2} + H_{2} O + N O_{2}$ ___

Discussion

13089.	(a) What happens when copper sulphate crystals are heated strongly? Explain with help of an equation. (b) What happens when a few drops of water are added to anhydrous copper sulphate? Explain with the help of an equation.
Answer» (a) What happens when copper sulphate crystals are heated strongly? Explain with help of an equation. (b) What happens when a few drops of water are added to anhydrous copper sulphate? Explain with the help of an equation.

13089.

(a) What happens when copper sulphate crystals are heated strongly? Explain with help of an equation. (b) What happens when a few drops of water are added to anhydrous copper sulphate? Explain with the help of an equation.

Answer»

(a) What happens when copper sulphate crystals are heated strongly? Explain with help of an equation.

(b) What happens when a few drops of water are added to anhydrous copper sulphate? Explain with the help of an equation.

Discussion

13090.	In the laboratory preparation of nitric acid, it can be obtained below 200∘C or above 200∘C, but the lower temperature is preferred. Which of the following reason(s) is /are correct? i. The glass apparatus may break at a higher temperature. ii. At lower temperature, potassium or sodium sulphate is formed, which cannot be easily removed from the apparatus.
Answer» In the laboratory preparation of nitric acid, it can be obtained below $200^{\circ}$ C or above $200^{\circ}$ C, but the lower temperature is preferred. Which of the following reason(s) is /are correct? i. The glass apparatus may break at a higher temperature. ii. At lower temperature, potassium or sodium sulphate is formed, which cannot be easily removed from the apparatus.

13090.

In the laboratory preparation of nitric acid, it can be obtained below 200∘C or above 200∘C, but the lower temperature is preferred. Which of the following reason(s) is /are correct? i. The glass apparatus may break at a higher temperature. ii. At lower temperature, potassium or sodium sulphate is formed, which cannot be easily removed from the apparatus.

Answer»

In the laboratory preparation of nitric acid, it can be obtained below $200^{\circ}$ C or above $200^{\circ}$ C, but the lower temperature is preferred. Which of the following reason(s) is /are correct?

i. The glass apparatus may break at a higher temperature.

ii. At lower temperature, potassium or sodium sulphate is formed, which cannot be easily removed from the apparatus.

Discussion

13091.	The vapour density of a gas is 11.2. The volume occupied by 10g of the gas at STP is
Answer» The vapour density of a gas is 11.2. The volume occupied by 10g of the gas at STP is

Discussion

13092.	what happens when a zinc strip is dipped into a copper sulphate solution ? (a) Write the equation for the reaction that takes place. (b) Name the type of reaction involved.
Answer» what happens when a zinc strip is dipped into a copper sulphate solution ? (a) Write the equation for the reaction that takes place. (b) Name the type of reaction involved.

13092.

what happens when a zinc strip is dipped into a copper sulphate solution ? (a) Write the equation for the reaction that takes place. (b) Name the type of reaction involved.

Answer»

what happens when a zinc strip is dipped into a copper sulphate solution ?

(a) Write the equation for the reaction that takes place.

(b) Name the type of reaction involved.

Discussion

13093.	limitations of the dobereiners theory?
Answer» limitations of the dobereiners theory?

Discussion

13094.	__ molecules are made up of atoms of different elements.
Answer» __ molecules are made up of atoms of different elements.

Discussion

13095.	The van der waals radii of O,N,Cl,F and Ne increases in the order of:
Answer» The van der waals radii of $O, N, C l, F$ and $N e$ increases in the order of:

Discussion

13096.	Choose the incorrect statement/statements from the following: (i) Atomic mass of hydrogen is 1 u. (ii) Atomic mass of helium is 2 u. (iii) Atomic mass of chlorine is 17 u. (iv) Atomic mass of phosphorous is 31 u.
Answer» Choose the incorrect statement/statements from the following: (i) Atomic mass of hydrogen is 1 u. (ii) Atomic mass of helium is 2 u. (iii) Atomic mass of chlorine is 17 u. (iv) Atomic mass of phosphorous is 31 u.

13096.

Choose the incorrect statement/statements from the following: (i) Atomic mass of hydrogen is 1 u. (ii) Atomic mass of helium is 2 u. (iii) Atomic mass of chlorine is 17 u. (iv) Atomic mass of phosphorous is 31 u.

Answer»

Choose the incorrect statement/statements from the following:

(i) Atomic mass of hydrogen is 1 u.
(ii) Atomic mass of helium is 2 u.
(iii) Atomic mass of chlorine is 17 u.
(iv) Atomic mass of phosphorous is 31 u.

Discussion

13097.	"Is malleable and ductile " This best describes: (a) a metal (b) a compound (c) a non-metal (d) a solution
Answer» "Is malleable and ductile " This best describes: (a) a metal (b) a compound (c) a non-metal (d) a solution

Discussion

13098.	(a) Give the general formula of alkanes. Write the name, structural formula and physical state of the compound containing: (i) 3 carbon atoms (ii) 8 carbon atoms (b) Which of the compounds named in (a) would show : (i) Isomerism (ii) Higher melting point (iii) Higher density (v) Lower boiling point? [5 MARKS]
Answer» (a) Give the general formula of alkanes. Write the name, structural formula and physical state of the compound containing: (i) 3 carbon atoms (ii) 8 carbon atoms (b) Which of the compounds named in (a) would show : (i) Isomerism (ii) Higher melting point (iii) Higher density (v) Lower boiling point? [5 MARKS]

Discussion

13099.	Which of the following compounds does not contain a multiple bond?
Answer» Which of the following compounds does not contain a multiple bond?

Discussion

13100.	What do you understand by valency ? What are the valancies of boron and xenon
Answer» What do you understand by valency ? What are the valancies of boron and xenon

Discussion

Explore topic-wise InterviewSolutions in .

Nitrogen molecule contains a ______ bond.

Soaps are:

Ethene, with the molecular formula C2H6, has

What is the atomicity of calcium

Magnesium + Cold water → ___

Why do elements combine?

Identify X in the following reaction. NaCl + H2O + CO2 + NH3 → NH4Cl + X. Identify X from the following options.

An element has an electronic configuration of 2, 8, 8. So based on this information, the element X is a

What happens when Aluminium reacts with sodium hydroxide?

CH3−CH2−C|CH3=CH−CH2−CH3|CH−CH2−CH3 What is the IUPAC name of the following compound?

If copper metal is heated over a flame it develops a coating. What is the colour and composition of coating.

difference between endothermic and exothermic reaction diff between displacement and double displacment

Why silver mirror test is only for aldehydes and Ketons?

Balance the following equations a)Pb(NO3)2 gives PbO +NO2+O2 b)NH3+CuO gives Cu+N2+H2O c)NaOH+H2SO4 gives Na2SO4 +H2O d)Al4C3+H2O gives CH4+Al(OH)3

Write the names and chemical formula of the products formed by the action of chlorine on slaked lime.

Q..1.. Name the natural source each of the following acids. a. Citric acid b. Oxalic acid c. Lactic acid d. Tartaric acid Q..2.. explain the action of dilute hydrochloric acid on the following with chemical equations A. Magnesium ribbon .B. sodium hydroxide C. Crushed egg shell.

Name the three compounds of calcium which are used in daily life and write one important use in each case.

(a) Giving their structures, state the number of single bonds, double bonds and triple bonds (if any) in the following compounds : (i) ethyne (ii) ethene (iii) benzene (b) Write the molecular formula and structure of cyclohexane. How many covalent bonds are there in a molecule of cyclohexane?

CH4 and C2H6 form a homologous series, they differ by:

Any undesirable change in the physical, chemical or biological characteristics of air, land and water that affect human life adversely is called__.

What is/are the produts formed when manganese is treated with 1% nitric acid?

4.5 moles of calcium carbonate are reacted with dilute hydrochloric acid. What is the mass of 4.5 moles of calcium carbonate? (Relative molecular mass of calcium carbonate is 100).

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

Barium chloride crystals contain 14.8% water of crystallisation. Find the number of molecules of water of crystallisation per molecule.

Valency of aluminium is:

Calamine ore can be converted into zince oxide by the process of: (a) roasting (b) hydrogenation (c) chlorination (d) calcination

___ has higher pH value. (Dilute HCl or Concentrated HCl)

Water of crystallisation is the

Which of the following is/are correct regarding ionic compounds?

10 dm3 of N2 gas and 10 dm3 of gas X at the same temperature contain the same number of molecules. The gas X is

If NaCl is doped with then the concentration of cation vacancies will be

Which one term in the following includes the others? air, flora, fauna, environment, water, sunlight, soil

(a) Define decomposers. Name one decomposer. (b) What is the role of decomposers in the ecosystem?

For a reversible system, when the concentration of the reacting system in equilibrium is increased then

Ammonium nitrate decomposes on heating.

A metal salt (M) on reacting with sodium hydroxide forms sodium sulphate and a gelatinous white precipitate of a metal hydroxide. The precipitate is soluble in excess of sodium hydroxide. Identify M.

Balance the following equation by short-cut method, and write the coefficient for O2 C5H11NH2+O2→CO2+H2O+NO2 ___

(a) What happens when copper sulphate crystals are heated strongly? Explain with help of an equation. (b) What happens when a few drops of water are added to anhydrous copper sulphate? Explain with the help of an equation.

The vapour density of a gas is 11.2. The volume occupied by 10g of the gas at STP is

what happens when a zinc strip is dipped into a copper sulphate solution ? (a) Write the equation for the reaction that takes place. (b) Name the type of reaction involved.

limitations of the dobereiners theory?

__ molecules are made up of atoms of different elements.

The van der waals radii of O,N,Cl,F and Ne increases in the order of:

Choose the incorrect statement/statements from the following: (i) Atomic mass of hydrogen is 1 u. (ii) Atomic mass of helium is 2 u. (iii) Atomic mass of chlorine is 17 u. (iv) Atomic mass of phosphorous is 31 u.

"Is malleable and ductile " This best describes: (a) a metal (b) a compound (c) a non-metal (d) a solution

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

What do you understand by valency ? What are the valancies of boron and xenon