15280 + Interview Questions in Chemistry Page 33 InterviewSolution

1601.	Sunil studied the characteristics of four metals W, X, Y, and Z, which were exposed to the atmosphere. He noted down the following observations:Column IColumn IIWNo layerXGreenish layerYBlack layerZReddish-brown layerIdentify W, X, Y, and Z among iron, copper, silver, and platinum.
Answer» Sunil studied the characteristics of four metals W, X, Y, and Z, which were exposed to the atmosphere. He noted down the following observations: $\begin{matrix} Column I & Column II W & No layer X & Greenish layer Y & Black layer Z & Reddish-brown layer \end{matrix}$ Identify W, X, Y, and Z among iron, copper, silver, and platinum.

Discussion

1602.	What is the value of electron gain enthalpy of Na+ if I.E.1 of Na=5.1 eV ?
Answer» What is the value of electron gain enthalpy of $N a^{+}$ if ${I.E.}_{1}$ of $N a = 5.1 e V$ ?

Discussion

1603.	State true or false with calculations Chlorophyll contains 2.68% of magnesium by mass.The number of Mg atoms in 3g of chlorophyll is 2.01 × 1021 atoms.
Answer» State true or false with calculations Chlorophyll contains 2.68% of magnesium by mass.The number of Mg atoms in 3g of chlorophyll is 2.01 × 10²¹atoms.

1603.

State true or false with calculations Chlorophyll contains 2.68% of magnesium by mass.The number of Mg atoms in 3g of chlorophyll is 2.01 × 1021 atoms.

Answer»

State true or false with calculations

Chlorophyll contains 2.68% of magnesium by mass.The number of Mg atoms in 3g of chlorophyll is 2.01 × 10²¹atoms.

Discussion

1604.	Temporary hardness can be removed by ___.
Answer» Temporary hardness can be removed by ___.

Discussion

1605.	Clinical thermometers are made of glass. Identify the characteristic(s) considered for the selection of glass: (i) It is a bad conductor of heat (ii) It is transparent (iii) It is malleable
Answer» Clinical thermometers are made of glass. Identify the characteristic(s) considered for the selection of glass: (i) It is a bad conductor of heat (ii) It is transparent (iii) It is malleable

Discussion

1606.	Give reasons for the following:In the laboratory preparation of nitric acid, the mixture of concentrated sulphuric acid and sodium nitrate should not be heated very strongly, above 200°C.
Answer» Give reasons for the following: In the laboratory preparation of nitric acid, the mixture of concentrated sulphuric acid and sodium nitrate should not be heated very strongly, above 200°C.

Discussion

1607.	11.2 L of N2 at NTP and 12 g H2 reacts according to the reaction then find out final weight of H2 N2 + 3 H2 = 2NH3
Answer» 11.2 L of N2 at NTP and 12 g H2 reacts according to the reaction then find out final weight of H2 N2 + 3 H2 = 2NH3

Discussion

1608.	explain displacement reaction with an activity or an activity for displacement reaction
Answer» explain displacement reaction with an activity or an activity for displacement reaction

Discussion

1609.	Find the molecular formula fo a hydrocarbon having vapour density 15, which contains 20% of Hydrogen.
Answer» Find the molecular formula fo a hydrocarbon having vapour density 15, which contains 20% of Hydrogen.

Discussion

1610.	Give reason- The crystals of washing soda change into the white powder upon exposure to air.
Answer» Give reason- The crystals of washing soda change into the white powder upon exposure to air.

Discussion

1611.	When NaOH reacts with aluminium metal,the following reaction happens: NaOH+Al+H2O→NaAlO2+Y If Y is a gas, identify it.
Answer» When NaOH reacts with aluminium metal,the following reaction happens: $N a O H + A l + H_{2} O \to N a A l O_{2} + Y$ If Y is a gas, identify it.

1611.

When NaOH reacts with aluminium metal,the following reaction happens: NaOH+Al+H2O→NaAlO2+Y If Y is a gas, identify it.

Answer»

When NaOH reacts with aluminium metal,the following reaction happens:

$N a O H + A l + H_{2} O \to N a A l O_{2} + Y$

If Y is a gas, identify it.

Discussion

1612.	If 5 mol of liquid A and 10 mol of liquid B are mixed to form an ideal solution then the total pressure of solution will be (Pa=200 mmHg and Pb=400 mmHg )
Answer» If 5 mol of liquid A and 10 mol of liquid B are mixed to form an ideal solution then the total pressure of solution will be (Pa=200 mmHg and Pb=400 mmHg )

Discussion

1613.	(a) Write two equations to show the extraction of copper from its sulphide ore.(b) How will you refine copper? Draw a labelled diagram of the electrolytic cell used for the refining of copper.
Answer» (a) Write two equations to show the extraction of copper from its sulphide ore. (b) How will you refine copper? Draw a labelled diagram of the electrolytic cell used for the refining of copper.

Discussion

1614.	The solubility of iodine in water increases in the presence of
Answer» The solubility of iodine in water increases in the presence of

1614.

The solubility of iodine in water increases in the presence of

Answer»

The solubility of iodine in water increases in the presence of

Discussion

1615.	Question 26 Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved and identify the type of reaction.
Answer» Question 26 Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved and identify the type of reaction.

Discussion

1616.	Question 33Helium atom has 2 electrons in its valence shell but its valency is not 2. Explain.
Answer» Question 33 Helium atom has 2 electrons in its valence shell but its valency is not 2. Explain.

Discussion

1617.	bleaching action of so2 is due to
Answer» bleaching action of so2 is due to

Discussion

1618.	Express 3.3 atm in the unit: pascal (Pa) bar millibar (mbar) hectopascal (hPa)
Answer» Express $3.3 atm$ in the unit: pascal (Pa) bar millibar (mbar) hectopascal (hPa)

Discussion

1619.	16. The geometry of electron pairs around S in SF6 is 1. Octahedral 2. Trigonal bipyramidal 3.square pyramidal 4.pentagonal planner.
Answer» 16. The geometry of electron pairs around S in SF6 is 1. Octahedral 2. Trigonal bipyramidal 3.square pyramidal 4.pentagonal planner.

Discussion

1620.	Name the chemicals obtained from common salt:
Answer» Name the chemicals obtained from common salt:

Discussion

1621.	If frequency of certain wave is 200 s−1, what would be the energy of this wave?
Answer» If frequency of certain wave is $200 s^{- 1}$ , what would be the energy of this wave?

Discussion

1622.	Acids change the colour of blue litmus to:
Answer» Acids change the colour of blue litmus to:

Discussion

1623.	The molecular mass of butane is
Answer» The molecular mass of butane is

Discussion

1624.	What would happen if the ozone layer in the atmosphere completely disappears?
Answer» What would happen if the ozone layer in the atmosphere completely disappears?

Discussion

1625.	a) Convert two soluble metallic nitrates to insoluble metallic chloride using dil. HCl. [5 MARKS] b) Which component is the oxidising agent in aqua regia? c) Which of the two - a solution of HCl in water or in toluene is an electrolyte? Justify.
Answer» a) Convert two soluble metallic nitrates to insoluble metallic chloride using dil. HCl. [5 MARKS] b) Which component is the oxidising agent in aqua regia? c) Which of the two - a solution of HCl in water or in toluene is an electrolyte? Justify.

Discussion

1626.	e dipole moment of chlorobenzene is 1.5 D. Theighest dipole moment will be shown by(1) 1, 2-dichlorobenzene (2) 1, 2, 3-trichlorobenzene(3) 1, 2, 3, 4-tetrachlorobenzene(4) 1, 2, 3, 4, 5-pentacobenzene
Answer» e dipole moment of chlorobenzene is 1.5 D. Theighest dipole moment will be shown by(1) 1, 2-dichlorobenzene (2) 1, 2, 3-trichlorobenzene(3) 1, 2, 3, 4-tetrachlorobenzene(4) 1, 2, 3, 4, 5-pentacobenzene

Discussion

1627.	Consider the reactions :(0) (CH3)2CH-CH2Br \xrightarrow{c2h5oh} (CH3)2CH-CH2OC2H5 +HBr (ii) (CH3)2CH- CH2Br \xrightarrow{c2h5o-}(ch3)2ch-ch2oc2h5 + br- the mechanisms of reactions (i) and (ii) are respectively(1) SN2 and S N2 (2) SN2 and SN1 (3) SN1 and SN2 (4) SN1 and S1
Answer» Consider the reactions :(0) (CH3)2CH-CH2Br \xrightarrow{c2h5oh} (CH3)2CH-CH2OC2H5 +HBr (ii) (CH3)2CH- CH2Br \xrightarrow{c2h5o-}(ch3)2ch-ch2oc2h5 + br- the mechanisms of reactions (i) and (ii) are respectively(1) SN2 and S N2 (2) SN2 and SN1 (3) SN1 and SN2 (4) SN1 and S1

Discussion

1628.	The average speed at T1 K and most probable speed at T2 K of CO2 gas is 9×104 cm/sec. The values of T1 and T2 are
Answer» The average speed at $T_{1} K$ and most probable speed at $T_{2} K$ of $C O_{2}$ gas is $9 \times 10^{4}$ cm/sec. The values of $T_{1}$ and $T_{2}$ are

Discussion

1629.	Is polymerisation is same as combination reaction?
Answer» Is polymerisation is same as combination reaction?

Discussion

1630.	The neutral particles inside the nucleus are called ___ .
Answer» The neutral particles inside the nucleus are called ___ .

Discussion

1631.	the maximum no. of filled orbital that are present in atom of chromium satisfies (n-1)≥4
Answer» the maximum no. of filled orbital that are present in atom of chromium satisfies (n-1)≥4

Discussion

1632.	Which among the following formulae can be used for calculating the concentration? (i) mass of solutemass of solution×100 (ii) mass of solutemass of solute + solvent×100 (iii) mass of solventmass of solution×100 (iv) mass of solventmass of solute + solvent×100 (v) mass of solutevolume of solution×100 (vi) mass of solventvolume of solution×100
Answer» Which among the following formulae can be used for calculating the concentration? (i) $\frac{mass of solute}{mass of solution} \times 100$ (ii) $\frac{mass of solute}{mass of solute + solvent} \times 100$ (iii) $\frac{mass of solvent}{mass of solution} \times 100$ (iv) $\frac{mass of solvent}{mass of solute + solvent} \times 100$ (v) $\frac{mass of solute}{volume of solution} \times 100$ (vi) $\frac{mass of solvent}{volume of solution} \times 100$

1632.

Which among the following formulae can be used for calculating the concentration? (i) mass of solutemass of solution×100 (ii) mass of solutemass of solute + solvent×100 (iii) mass of solventmass of solution×100 (iv) mass of solventmass of solute + solvent×100 (v) mass of solutevolume of solution×100 (vi) mass of solventvolume of solution×100

Answer»

Which among the following formulae can be used for calculating the concentration?

(i) $\frac{mass of solute}{mass of solution} \times 100$

(ii) $\frac{mass of solute}{mass of solute + solvent} \times 100$

(iii) $\frac{mass of solvent}{mass of solution} \times 100$

(iv) $\frac{mass of solvent}{mass of solute + solvent} \times 100$

(v) $\frac{mass of solute}{volume of solution} \times 100$

(vi) $\frac{mass of solvent}{volume of solution} \times 100$

Discussion

1633.	Write the equation for the following reaction:Magnesium sulphate solution is mixed with barium chloride solution.
Answer» Write the equation for the following reaction: Magnesium sulphate solution is mixed with barium chloride solution.

Discussion

1634.	Write the properties of covalent compounds.
Answer» Write the properties of covalent compounds.

Discussion

1635.	The equilibrium constant at 850 K for the reaction N2(g)+O2(g)⇋2NO(g) is 0.5625. The equilibrium concentration of NO(g) is 3.0×10−3M If the concentration of N2(g) and O2(g) are equal, the concentration of N2(g) in M is:
Answer» The equilibrium constant at 850 K for the reaction $N_{2} (g) + O_{2} (g) ⇋ 2 N O (g)$ is 0.5625. The equilibrium concentration of $N O (g)$ is $3.0 \times 10^{-} 3 M$ If the concentration of $N_{2} (g)$ and $O_{2} (g)$ are equal, the concentration of $N_{2} (g)$ in M is:

Discussion

1636.	51. When 5 g of formic acid is burnt at 25^° C, theamount of heat evolved is x kJ. AH forcombustion (in kJ) of formic acid is
Answer» 51. When 5 g of formic acid is burnt at 25^° C, theamount of heat evolved is x kJ. AH forcombustion (in kJ) of formic acid is

Discussion

1637.	2g of potassium sulphate was dissolved in 12.5 ml of water. On cooling, the first crystals appeared at 60∘C. The solubility of potassium sulphate in water at 60∘C is __ g.
Answer» 2g of potassium sulphate was dissolved in 12.5 ml of water. On cooling, the first crystals appeared at $60^{\circ} C$ . The solubility of potassium sulphate in water at $60^{\circ} C$ is __ g.

Discussion

1638.	hybrid orbitals and unhybrid orbitals of CH2 DOUBLE BOND C DOUBLE BOND CH2?
Answer» hybrid orbitals and unhybrid orbitals of CH2 DOUBLE BOND C DOUBLE BOND CH2?

Discussion

1639.	What is observed when hot concentrated caustic soda solution is added to (a) Zinc and (b) Aluminium oxide ? Write balanced equations.
Answer» What is observed when hot concentrated caustic soda solution is added to (a) Zinc and (b) Aluminium oxide ? Write balanced equations.

Discussion

1640.	ntOH-C6H5-CH2OH+HCl(excessn ntn ntOH-C6H5-CH2OH+HCl(EXCESS) GIVES An ntA+Mg(dry ether) GIVES Bn ntB ISn ntn ntn ntn ntn ntn
Answer» ntOH-C6H5-CH2OH+HCl(excessn ntn ntOH-C6H5-CH2OH+HCl(EXCESS) GIVES An ntA+Mg(dry ether) GIVES Bn ntB ISn ntn ntn ntn ntn ntn

Discussion

1641.	a metal oxide formula is M2O it can be thermally decomposite to the metal and oxygen .5.8gm of the m2o
Answer» a metal oxide formula is M2O it can be thermally decomposite to the metal and oxygen .5.8gm of the m2o

Discussion

1642.	Which of the following is the correct molecular formula of sulphuric acid?
Answer» Which of the following is the correct molecular formula of sulphuric acid?

Discussion

1643.	3. A compound possesses 8%sulphur by mass.what will be the list molecular mass
Answer» 3. A compound possesses 8%sulphur by mass.what will be the list molecular mass

Discussion

1644.	7. In electrolysis of an aqueous solution of sodium sulphate 2.4 litre of oxygen at STP was liberated at anode. The volume of hydrogen at STP liberated at cathode would be?
Answer» 7. In electrolysis of an aqueous solution of sodium sulphate 2.4 litre of oxygen at STP was liberated at anode. The volume of hydrogen at STP liberated at cathode would be?

Discussion

1645.	When we rub glass rod with silk cloth ,glass rod acquires positive charge and loses electron.why only positive charge?
Answer» When we rub glass rod with silk cloth ,glass rod acquires positive charge and loses electron.why only positive charge?

Discussion

1646.	Write a short note on the reaction of non-metals with oxygen, water and acids.
Answer» Write a short note on the reaction of non-metals with oxygen, water and acids.

Discussion

1647.	what is elligham diagram??
Answer» what is elligham diagram??

Discussion

1648.	What observations can be made during the reaction between iron sulphate and zinc ?
Answer» What observations can be made during the reaction between iron sulphate and zinc ?

Discussion

1649.	the enthalpies of formation of OH(g), H(g) , O(g) are 42, 218 , 248 kjper mole. The value of bond enthalpy OH is ?
Answer» the enthalpies of formation of OH(g), H(g) , O(g) are 42, 218 , 248 kjper mole. The value of bond enthalpy OH is ?

Discussion

1650.	20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample?
Answer» 20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample?

Discussion

Explore topic-wise InterviewSolutions in .

Sunil studied the characteristics of four metals W, X, Y, and Z, which were exposed to the atmosphere. He noted down the following observations:Column IColumn IIWNo layerXGreenish layerYBlack layerZReddish-brown layerIdentify W, X, Y, and Z among iron, copper, silver, and platinum.

What is the value of electron gain enthalpy of Na+ if I.E.1 of Na=5.1 eV ?

State true or false with calculations Chlorophyll contains 2.68% of magnesium by mass.The number of Mg atoms in 3g of chlorophyll is 2.01 × 1021 atoms.

Temporary hardness can be removed by ___.

Clinical thermometers are made of glass. Identify the characteristic(s) considered for the selection of glass: (i) It is a bad conductor of heat (ii) It is transparent (iii) It is malleable

Give reasons for the following:In the laboratory preparation of nitric acid, the mixture of concentrated sulphuric acid and sodium nitrate should not be heated very strongly, above 200°C.

11.2 L of N2 at NTP and 12 g H2 reacts according to the reaction then find out final weight of H2 N2 + 3 H2 = 2NH3

explain displacement reaction with an activity or an activity for displacement reaction

Find the molecular formula fo a hydrocarbon having vapour density 15, which contains 20% of Hydrogen.

Give reason- The crystals of washing soda change into the white powder upon exposure to air.

When NaOH reacts with aluminium metal,the following reaction happens: NaOH+Al+H2O→NaAlO2+Y If Y is a gas, identify it.

If 5 mol of liquid A and 10 mol of liquid B are mixed to form an ideal solution then the total pressure of solution will be (Pa=200 mmHg and Pb=400 mmHg )

(a) Write two equations to show the extraction of copper from its sulphide ore.​(b) How will you refine copper? Draw a labelled diagram of the electrolytic cell used for the refining of copper.

The solubility of iodine in water increases in the presence of

Question 26 Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved and identify the type of reaction.

Question 33Helium atom has 2 electrons in its valence shell but its valency is not 2. Explain.

bleaching action of so2 is due to

Express 3.3 atm in the unit: pascal (Pa) bar millibar (mbar) hectopascal (hPa)

16. The geometry of electron pairs around S in SF6 is 1. Octahedral 2. Trigonal bipyramidal 3.square pyramidal 4.pentagonal planner.

Name the chemicals obtained from common salt:

If frequency of certain wave is 200 s−1, what would be the energy of this wave?

Acids change the colour of blue litmus to:

The molecular mass of butane is

What would happen if the ozone layer in the atmosphere completely disappears?

a) Convert two soluble metallic nitrates to insoluble metallic chloride using dil. HCl. [5 MARKS] b) Which component is the oxidising agent in aqua regia? c) Which of the two - a solution of HCl in water or in toluene is an electrolyte? Justify.

e dipole moment of chlorobenzene is 1.5 D. Theighest dipole moment will be shown by(1) 1, 2-dichlorobenzene (2) 1, 2, 3-trichlorobenzene(3) 1, 2, 3, 4-tetrachlorobenzene(4) 1, 2, 3, 4, 5-pentacobenzene

Consider the reactions :(0) (CH3)2CH-CH2Br \xrightarrow{c2h5oh} (CH3)2CH-CH2OC2H5 +HBr (ii) (CH3)2CH- CH2Br \xrightarrow{c2h5o-}(ch3)2ch-ch2oc2h5 + br- the mechanisms of reactions (i) and (ii) are respectively(1) SN2 and S N2 (2) SN2 and SN1 (3) SN1 and SN2 (4) SN1 and S1

The average speed at T1 K and most probable speed at T2 K of CO2 gas is 9×104 cm/sec. The values of T1 and T2 are

Is polymerisation is same as combination reaction?

The neutral particles inside the nucleus are called ___ .

the maximum no. of filled orbital that are present in atom of chromium satisfies (n-1)≥4

Write the equation for the following reaction:Magnesium sulphate solution is mixed with barium chloride solution.

Write the properties of covalent compounds.

The equilibrium constant at 850 K for the reaction N2(g)+O2(g)⇋2NO(g) is 0.5625. The equilibrium concentration of NO(g) is 3.0×10−3M If the concentration of N2(g) and O2(g) are equal, the concentration of N2(g) in M is:

51. When 5 g of formic acid is burnt at 25^° C, theamount of heat evolved is x kJ. AH forcombustion (in kJ) of formic acid is

2g of potassium sulphate was dissolved in 12.5 ml of water. On cooling, the first crystals appeared at 60∘C. The solubility of potassium sulphate in water at 60∘C is __ g.

hybrid orbitals and unhybrid orbitals of CH2 DOUBLE BOND C DOUBLE BOND CH2?

What is observed when hot concentrated caustic soda solution is added to (a) Zinc and (b) Aluminium oxide ? Write balanced equations.

ntOH-C6H5-CH2OH+HCl(excessn ntn ntOH-C6H5-CH2OH+HCl(EXCESS) GIVES An ntA+Mg(dry ether) GIVES Bn ntB ISn ntn ntn ntn ntn ntn

a metal oxide formula is M2O it can be thermally decomposite to the metal and oxygen .5.8gm of the m2o

Which of the following is the correct molecular formula of sulphuric acid?

3. A compound possesses 8%sulphur by mass.what will be the list molecular mass

7. In electrolysis of an aqueous solution of sodium sulphate 2.4 litre of oxygen at STP was liberated at anode. The volume of hydrogen at STP liberated at cathode would be?

When we rub glass rod with silk cloth ,glass rod acquires positive charge and loses electron.why only positive charge?

Write a short note on the reaction of non-metals with oxygen, water and acids.

what is elligham diagram??

What observations can be made during the reaction between iron sulphate and zinc ?

the enthalpies of formation of OH(g), H(g) , O(g) are 42, 218 , 248 kjper mole. The value of bond enthalpy OH is ?

20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample?

(a) Write two equations to show the extraction of copper from its sulphide ore.(b) How will you refine copper? Draw a labelled diagram of the electrolytic cell used for the refining of copper.