15280 + Interview Questions in Chemistry Page 162 InterviewSolution

8051.	Write the electron-dot structure for sodium and chlorine atoms. How do these form a chemical bond? Name the type of bond so formed. Why does a compound so formed have high melting point?
Answer» Write the electron-dot structure for sodium and chlorine atoms. How do these form a chemical bond? Name the type of bond so formed. Why does a compound so formed have high melting point?

Discussion

8052.	Which of the following pairs does not contain unsaturated hydrocarbons?
Answer» Which of the following pairs does not contain unsaturated hydrocarbons?

Discussion

8053.	The volume of water that must be added to a mixture of 250 ml of 0.6 M HCl and 750 ml of 0.2 M HCl to obtain 0.25 M solution of HCl is:
Answer» The volume of water that must be added to a mixture of 250 ml of 0.6 M HCl and 750 ml of 0.2 M HCl to obtain 0.25 M solution of HCl is:

Discussion

8054.	5.0 g of a certain element X forms 10.0g of its oxide having the formula X4O6. The atomic mass of X is ?
Answer» 5.0 g of a certain element X forms 10.0g of its oxide having the formula $X_{4} O_{6}$ . The atomic mass of X is ?

Discussion

8055.	37.Explain about covalent or molecular hydrides
Answer» 37.Explain about covalent or molecular hydrides

Discussion

8056.	If a hydrocarbon has 5 carbon skeletal and there is a double bond between the 2nd and the 3rd carbon, what is it named as?
Answer» If a hydrocarbon has 5 carbon skeletal and there is a double bond between the $2^{n d}$ and the $3^{r d}$ carbon, what is it named as?

Discussion

8057.	Which among these contains both ionic and covalent bonds?
Answer» Which among these contains both ionic and covalent bonds?

Discussion

8058.	Select the correct statements regarding electric conduction.
Answer» Select the correct statements regarding electric conduction.

Discussion

8059.	What is the order of strength of P pi bonding in various orbital(among these 2p,2d,3p and 3d)?
Answer» What is the order of strength of P pi bonding in various orbital(among these 2p,2d,3p and 3d)?

Discussion

8060.	Question 35Which of the following can undergo a chemical reaction?(a) MgSO4+Fe (b) ZnSO4+Fe (c) MgSO4+Pb (d) CuSO4+Fe
Answer» Question 35 Which of the following can undergo a chemical reaction? (a) ${MgSO}_{4} + Fe$ (b) ${ZnSO}_{4} + Fe$ (c) ${MgSO}_{4} + Pb$ (d) ${CuSO}_{4} + Fe$

Discussion

8061.	2016-17)78 A gas mixture contains 50% helium and 50%methane by volume at S.T.P. What is thepercentage by mass of the methane in the mixture?(1) 20%(3) 60%(2) 40%(4) 80%(Delhi, Stage-l, 2016-17)hot on Y83 Pro
Answer» 2016-17)78 A gas mixture contains 50% helium and 50%methane by volume at S.T.P. What is thepercentage by mass of the methane in the mixture?(1) 20%(3) 60%(2) 40%(4) 80%(Delhi, Stage-l, 2016-17)hot on Y83 Pro

Discussion

8062.	Which of the following does not have a coordinate bond?
Answer» Which of the following does not have a coordinate bond?

Discussion

8063.	67 pH of 0.1M BOH (weak base) is found to be 12. The solution at temperature T K will display an osmotic pressure equal to _______ (a) 0.01RT (b) 0.01(RT) (c) 0.11RT (d) 1.1RT
Answer» 67 pH of 0.1M BOH (weak base) is found to be 12. The solution at temperature T K will display an osmotic pressure equal to _______ (a) 0.01RT (b) 0.01(RT) (c) 0.11RT (d) 1.1RT

Discussion

8064.	What is meant by electrolysis of water
Answer» What is meant by electrolysis of water

Discussion

8065.	How many molecules are present in one gram of hydrogen?
Answer» How many molecules are present in one gram of hydrogen?

Discussion

8066.	Number of alpha H in But-2-ene ?Is it 6??
Answer» Number of alpha H in But-2-ene ? Is it 6??

Discussion

8067.	Give two chemical tests to distinguish between dilute nitric acid and dilute hydrochloric acid.
Answer» Give two chemical tests to distinguish between dilute nitric acid and dilute hydrochloric acid.

Discussion

8068.	Which of the following observations helps to determine whether a chemical reaction has taken place or not?(i) Change in state.(ii) Change in colour.(iii) Change in shape(iv) Evolution of gas.(v) Change in temperature.
Answer» Which of the following observations helps to determine whether a chemical reaction has taken place or not? (i) Change in state. (ii) Change in colour. (iii) Change in shape (iv) Evolution of gas. (v) Change in temperature.

8068.

Which of the following observations helps to determine whether a chemical reaction has taken place or not?(i) Change in state.(ii) Change in colour.(iii) Change in shape(iv) Evolution of gas.(v) Change in temperature.

Answer»

Which of the following observations helps to determine whether a chemical reaction has taken place or not?

(i) Change in state.

(ii) Change in colour.

(iii) Change in shape

(iv) Evolution of gas.

(v) Change in temperature.

Discussion

8069.	if periodic table has 10.periods then how many subshells are in 8th period
Answer» if periodic table has 10.periods then how many subshells are in 8th period

Discussion

8070.	ntDuring an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio of Cp/Cv for the gas is.n nt1) 3/2n nt2) 4/3n nt3) 2n nt4) 5/3n
Answer» ntDuring an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio of Cp/Cv for the gas is.n nt1) 3/2n nt2) 4/3n nt3) 2n nt4) 5/3n

Discussion

8071.	The heat of neutralisation of a strong acid and a strong alkali is −57.0 kJ mol−1. The magnitude of heat released when 0.5 mole of HNO3 solution is mixed with 0.8 mole of KOH is:
Answer» The heat of neutralisation of a strong acid and a strong alkali is $- 57.0 {kJ mol}^{- 1} .$ The magnitude of heat released when $0.5 mole$ of $H N O_{3}$ solution is mixed with $0.8 mole$ of $K O H$ is:

Discussion

8072.	(a) Name an element whose properties were predicted on the basis of its position in Mendeleev's periodic table. (b) Name two elements whose atomic weights were corrected on the basis of their positions in Mendeleev's periodic table. (c) How many elements were known at the time of Mendeleev's classification of elements ?
Answer» (a) Name an element whose properties were predicted on the basis of its position in Mendeleev's periodic table. (b) Name two elements whose atomic weights were corrected on the basis of their positions in Mendeleev's periodic table. (c) How many elements were known at the time of Mendeleev's classification of elements ?

8072.

(a) Name an element whose properties were predicted on the basis of its position in Mendeleev's periodic table. (b) Name two elements whose atomic weights were corrected on the basis of their positions in Mendeleev's periodic table. (c) How many elements were known at the time of Mendeleev's classification of elements ?

Answer»

(a) Name an element whose properties were predicted on the basis of its position in Mendeleev's periodic table.

(b) Name two elements whose atomic weights were corrected on the basis of their positions in Mendeleev's periodic table.

(c) How many elements were known at the time of Mendeleev's classification of elements ?

Discussion

8073.	34. Write a chemical equation for tanishing of silver
Answer» 34. Write a chemical equation for tanishing of silver

Discussion

8074.	(a) State what happens when:(i) Copper sulphate solution is electrolysed using a platinum anode.(ii) Excess ammonia is passed through an aqueous solution of lead nitrate.(iii) Washing soda is left exposed to dry air for long time.(iv) Silver nitrate solution is added to dil. HCl.(v) Hot concentrated sulphuric acid is added to sodium chloride crystals.
Answer» (a) State what happens when: (i) Copper sulphate solution is electrolysed using a platinum anode. (ii) Excess ammonia is passed through an aqueous solution of lead nitrate. (iii) Washing soda is left exposed to dry air for long time. (iv) Silver nitrate solution is added to dil. HCl. (v) Hot concentrated sulphuric acid is added to sodium chloride crystals.

Discussion

8075.	If oxide ions are replaced by X^-8/3 ions the number of ionic vacancies per unit cell are?
Answer» If oxide ions are replaced by X^-8/3 ions the number of ionic vacancies per unit cell are?

Discussion

8076.	29. the speed of electrons in the second orbit of Be3+ ions will be: a)c/137 b)2c/137 c)3c/137 d)4c/137
Answer» 29. the speed of electrons in the second orbit of Be3+ ions will be: a)c/137 b)2c/137 c)3c/137 d)4c/137

Discussion

8077.	ntWater and chlorobenzene are immiscible liquids. There mixture boils at 90^°C under a reduced pressure of 7.8210 Pa. The vapour pressure of pure water at 90^°C is 7.0310 Pa. On weight percent basis, chlorobenzene in the distillate is equal to (molecular weight of chlorobenzene is 112.5 g/mol)n ntn ntn nt50/60/70/80n
Answer» ntWater and chlorobenzene are immiscible liquids. There mixture boils at 90^°C under a reduced pressure of 7.8210 Pa. The vapour pressure of pure water at 90^°C is 7.0310 Pa. On weight percent basis, chlorobenzene in the distillate is equal to (molecular weight of chlorobenzene is 112.5 g/mol)n ntn ntn nt50/60/70/80n

Discussion

8078.	What is meant by Static balance and Dynamic balance ?
Answer» What is meant by Static balance and Dynamic balance ?

Discussion

8079.	What do we mean by stability of an atom.please explain in details
Answer» What do we mean by stability of an atom.please explain in details

Discussion

8080.	The pH of a solution is 4. Concentration of OH– ions in the solution isOPTIONS:(a) 1 × 10–11 mol L^–1(b) 1 × 10–4 mol L^–1(c) 1 × 10–10 mol L^–1(d) 1 × 10–14 mol L^–1
Answer» The pH of a solution is 4. Concentration of OH– ions in the solution is OPTIONS: (a) 1 × 10–11 mol L^–1 (b) 1 × 10–4 mol L^–1 (c) 1 × 10–10 mol L^–1 (d) 1 × 10–14 mol L^–1

Discussion

8081.	A weak acid react with strong base, ionisation cons†an t of weak acid is 10^{-4}. Find out equilibrium cons†an t for this reaction: (1) 10^{-10}
Answer» A weak acid react with strong base, ionisation cons†an t of weak acid is 10^{-4}. Find out equilibrium cons†an t for this reaction: (1) 10^{-10}

Discussion

8082.	Air is dense at sea level.This is an application of ___ law.
Answer» Air is dense at sea level.This is an application of ___ law.

Discussion

8083.	A sample of Ammonium Phosphate contains 3. 18 moles of hydrogen atoms the number of moles of oxygen atoms in the sample is 0.265 0.795 1.06 4.00
Answer» A sample of Ammonium Phosphate contains 3. 18 moles of hydrogen atoms the number of moles of oxygen atoms in the sample is 0.265 0.795 1.06 4.00

Discussion

8084.	Redox reactions takes how much time in electrochemical cells.
Answer» Redox reactions takes how much time in electrochemical cells.

Discussion

8085.	The formation of oxide ion 0^{2-} (g) from oxygen atom requires first an exothermic and then an endothermic step as shown below O(g)+e−→O−(g);△H⊝=−141kjmol−1O−(g)+e−⇒O2(g);△H⊝=+780kjmol−1 Thus, process of formation of O2− in gas phase is unfavourable even through O2− is isoelectronic with neon. It is due to the fact that (a) Oxygen si more electronegative (b) addition of electron in oxygen results in larger size of the ion (c) electron repulsiion outweighs the stability gained by achieving noble gas configuration (d) O− ion has comparativly smaller size than oxygen atom
Answer» The formation of oxide ion 0^{2-} (g) from oxygen atom requires first an exothermic and then an endothermic step as shown below $O (g) + e^{-} \to O^{-} (g); △ H^{⊝} = - 141 k j m o l^{- 1} O^{-} (g) + e^{-} \Rightarrow O^{2} (g); △ H^{⊝} = + 780 k j m o l^{- 1}$ Thus, process of formation of $O^{2 -}$ in gas phase is unfavourable even through $O^{2 -}$ is isoelectronic with neon. It is due to the fact that (a) Oxygen si more electronegative (b) addition of electron in oxygen results in larger size of the ion (c) electron repulsiion outweighs the stability gained by achieving noble gas configuration (d) $O^{-}$ ion has comparativly smaller size than oxygen atom

Discussion

8086.	Oxides of metals are basic while those of non--metals are acidic. Explain with example.
Answer» Oxides of metals are basic while those of non--metals are acidic. Explain with example.

Discussion

8087.	The mass of an atom of C is
Answer» The mass of an atom of C is

Discussion

8088.	The chemical symbol for sodium is(a) So(b) Sd(c) NA(d) Na
Answer» The chemical symbol for sodium is (a) So (b) Sd (c) NA (d) Na

Discussion

8089.	The number of position isomers possible for 1- pentanol is
Answer» The number of position isomers possible for 1- pentanol is

Discussion

8090.	10. The equivalent weight of a metal is 100. If the specific heat of metal is 0.09 J/g calculate the exact atomic weight of the metal
Answer» 10. The equivalent weight of a metal is 100. If the specific heat of metal is 0.09 J/g calculate the exact atomic weight of the metal

Discussion

8091.	Explain the electrolysis of copper sulphate solution with the help of a diagram.
Answer» Explain the electrolysis of copper sulphate solution with the help of a diagram.

Discussion

8092.	Question 8What are the uses of fullerenes?
Answer» Question 8 What are the uses of fullerenes?

8092.

Question 8What are the uses of fullerenes?

Answer»

Question 8

What are the uses of fullerenes?

Discussion

8093.	Which of the following are correct structural isomers of butane?(i)(ii)(iii)(iv) (a) (i) and (iii)(b) (ii) and (iv)(c) (i) and (ii)(d) (iii) and (iv)
Answer» Which of the following are correct structural isomers of butane? (i) (ii) (iii) (iv) (a) (i) and (iii) (b) (ii) and (iv) (c) (i) and (ii) (d) (iii) and (iv)

Discussion

8094.	Balance the following reaction: 1.when ammonium hydroxide is added to a solvent of iron (II) Sulphate , a green ppt of iron (II) hydroxide and ammonium sulphate is formed. 2.Zinc reacts with dilute hydrochloric acid to form zinc chloride and hydrogen gas liberated.
Answer» Balance the following reaction: 1.when ammonium hydroxide is added to a solvent of iron (II) Sulphate , a green ppt of iron (II) hydroxide and ammonium sulphate is formed. 2.Zinc reacts with dilute hydrochloric acid to form zinc chloride and hydrogen gas liberated.

8094.

Balance the following reaction: 1.when ammonium hydroxide is added to a solvent of iron (II) Sulphate , a green ppt of iron (II) hydroxide and ammonium sulphate is formed. 2.Zinc reacts with dilute hydrochloric acid to form zinc chloride and hydrogen gas liberated.

Answer»

Balance the following reaction:

1.when ammonium hydroxide is added to a solvent of iron (II) Sulphate , a green ppt of iron (II) hydroxide and ammonium sulphate is formed.

2.Zinc reacts with dilute hydrochloric acid to form zinc chloride and hydrogen gas liberated.

Discussion

8095.	State five uses of metals and five of non-metals.
Answer» State five uses of metals and five of non-metals.

Discussion

8096.	State, giving reasons, which of the following reactions will occur and which will not:(a) MgSO4 (aq) + Cu(s) → CuSO4 (aq) + Mg(s)(b) CuSO4 (aq) + Fe (s) → FeSO4 (aq) + Cu(s)(c) MgSO4 (aq) + Fe (s) → FeSO4 (aq) + Mg(s)
Answer» State, giving reasons, which of the following reactions will occur and which will not: (a) MgSO₄ (aq) + Cu(s) → CuSO₄ (aq) + Mg(s) (b) CuSO₄ (aq) + Fe (s) → FeSO₄(aq) + Cu(s) (c) MgSO₄ (aq) + Fe (s) → FeSO₄ (aq) + Mg(s)

Discussion

8097.	why in equilibrium , partial pressure of a gas =mole fraction × total pressure and in Dalton's law in solutions, total pressure = mole fraction × partial pressure
Answer» why in equilibrium , partial pressure of a gas =mole fraction × total pressure and in Dalton's law in solutions, total pressure = mole fraction × partial pressure

Discussion

8098.	If x-2y=0, then in this case x and y vary _________
Answer» If x-2y=0, then in this case x and y vary _________

Discussion

8099.	H2SO4 and HNO3 are known as acids but C2H4 is not known as acid even though both have Hydrogen atoms. Choose correct option regarding C2H4.
Answer» $H_{2} S O_{4}$ and $H N O_{3}$ are known as acids but $C_{2} H_{4}$ is not known as acid even though both have Hydrogen atoms. Choose correct option regarding $C_{2} H_{4}$ _.

8099.

H2SO4 and HNO3 are known as acids but C2H4 is not known as acid even though both have Hydrogen atoms. Choose correct option regarding C2H4.

Answer»

$H_{2} S O_{4}$ and $H N O_{3}$ are known as acids but $C_{2} H_{4}$ is not known as acid even though both have Hydrogen atoms.

Choose correct option regarding $C_{2} H_{4}$ _.

Discussion

8100.	What will be the products in the following reaction? HCO3 + Al --
Answer» What will be the products in the following reaction? HCO₃+ Al --

8100.

What will be the products in the following reaction? HCO3 + Al --

Answer»

What will be the products in the following reaction?

HCO₃+ Al --

Discussion

Explore topic-wise InterviewSolutions in .

Write the electron-dot structure for sodium and chlorine atoms. How do these form a chemical bond? Name the type of bond so formed. Why does a compound so formed have high melting point?

Which of the following pairs does not contain unsaturated hydrocarbons?

The volume of water that must be added to a mixture of 250 ml of 0.6 M HCl and 750 ml of 0.2 M HCl to obtain 0.25 M solution of HCl is:

5.0 g of a certain element X forms 10.0g of its oxide having the formula X4O6. The atomic mass of X is ?

37.Explain about covalent or molecular hydrides

If a hydrocarbon has 5 carbon skeletal and there is a double bond between the 2nd and the 3rd carbon, what is it named as?

Which among these contains both ionic and covalent bonds?

Select the correct statements regarding electric conduction.

What is the order of strength of P pi bonding in various orbital(among these 2p,2d,3p and 3d)?

Question 35Which of the following can undergo a chemical reaction?(a) MgSO4+Fe (b) ZnSO4+Fe (c) MgSO4+Pb (d) CuSO4+Fe

2016-17)78 A gas mixture contains 50% helium and 50%methane by volume at S.T.P. What is thepercentage by mass of the methane in the mixture?(1) 20%(3) 60%(2) 40%(4) 80%(Delhi, Stage-l, 2016-17)hot on Y83 Pro

Which of the following does not have a coordinate bond?

67 pH of 0.1M BOH (weak base) is found to be 12. The solution at temperature T K will display an osmotic pressure equal to _______ (a) 0.01RT (b) 0.01(RT) (c) 0.11RT (d) 1.1RT

What is meant by electrolysis of water

How many molecules are present in one gram of hydrogen?

Number of alpha H in But-2-ene ?Is it 6??

Give two chemical tests to distinguish between dilute nitric acid and dilute hydrochloric acid.

Which of the following observations helps to determine whether a chemical reaction has taken place or not?(i) Change in state.(ii) Change in colour.(iii) Change in shape(iv) Evolution of gas.(v) Change in temperature.

if periodic table has 10.periods then how many subshells are in 8th period

ntDuring an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio of Cp/Cv for the gas is.n nt1) 3/2n nt2) 4/3n nt3) 2n nt4) 5/3n

The heat of neutralisation of a strong acid and a strong alkali is −57.0 kJ mol−1. The magnitude of heat released when 0.5 mole of HNO3 solution is mixed with 0.8 mole of KOH is:

34. Write a chemical equation for tanishing of silver

If oxide ions are replaced by X^-8/3 ions the number of ionic vacancies per unit cell are?

29. the speed of electrons in the second orbit of Be3+ ions will be: a)c/137 b)2c/137 c)3c/137 d)4c/137

What is meant by Static balance and Dynamic balance ?

What do we mean by stability of an atom.please explain in details

The pH of a solution is 4. Concentration of OH– ions in the solution isOPTIONS:(a) 1 × 10–11 mol L^–1(b) 1 × 10–4 mol L^–1(c) 1 × 10–10 mol L^–1(d) 1 × 10–14 mol L^–1

A weak acid react with strong base, ionisation cons†an t of weak acid is 10^{-4}. Find out equilibrium cons†an t for this reaction: (1) 10^{-10}

Air is dense at sea level.This is an application of ___ law.

A sample of Ammonium Phosphate contains 3. 18 moles of hydrogen atoms the number of moles of oxygen atoms in the sample is 0.265 0.795 1.06 4.00

Redox reactions takes how much time in electrochemical cells.

Oxides of metals are basic while those of non--metals are acidic. Explain with example.

The mass of an atom of C is

The chemical symbol for sodium is(a) So(b) Sd(c) NA(d) Na

The number of position isomers possible for 1- pentanol is

10. The equivalent weight of a metal is 100. If the specific heat of metal is 0.09 J/g calculate the exact atomic weight of the metal

Explain the electrolysis of copper sulphate solution with the help of a diagram.

Question 8What are the uses of fullerenes?

Which of the following are correct structural isomers of butane?(i)(ii)(iii)(iv) (a) (i) and (iii)(b) (ii) and (iv)(c) (i) and (ii)(d) (iii) and (iv)

Balance the following reaction: 1.when ammonium hydroxide is added to a solvent of iron (II) Sulphate , a green ppt of iron (II) hydroxide and ammonium sulphate is formed. 2.Zinc reacts with dilute hydrochloric acid to form zinc chloride and hydrogen gas liberated.

State five uses of metals and five of non-metals.

State, giving reasons, which of the following reactions will occur and which will not:(a) MgSO4 (aq) + Cu(s) → CuSO4 (aq) + Mg(s)(b) CuSO4 (aq) + Fe (s) → FeSO4 (aq) + Cu(s)(c) MgSO4 (aq) + Fe (s) ​→ FeSO4 (aq) + Mg(s)

why in equilibrium , partial pressure of a gas =mole fraction × total pressure and in Dalton's law in solutions, total pressure = mole fraction × partial pressure

If x-2y=0, then in this case x and y vary _________

H2SO4 and HNO3 are known as acids but C2H4 is not known as acid even though both have Hydrogen atoms. Choose correct option regarding C2H4.

What will be the products in the following reaction? HCO​​​​3 + Al --

State, giving reasons, which of the following reactions will occur and which will not:(a) MgSO4 (aq) + Cu(s) → CuSO4 (aq) + Mg(s)(b) CuSO4 (aq) + Fe (s) → FeSO4 (aq) + Cu(s)(c) MgSO4 (aq) + Fe (s) → FeSO4 (aq) + Mg(s)

What will be the products in the following reaction? HCO3 + Al --