10223 + Interview Questions in Chemistry Page 58 InterviewSolution

2851.	Addition of potassium chromate to a solution gives yellow precipitate. This confirms the presence of _____ cation in it.
Answer» Addition of potassium chromate to a solution gives yellow precipitate. This confirms the presence of _____ cation in it.

Discussion

2852.	If the size of the nucleus is 10^-15 is scaled upto the tip of a shrp pin (10^-5), then what is the size of the atom?
Answer» If the size of the nucleus is 10^-15 is scaled upto the tip of a shrp pin (10^-5), then what is the size of the atom?

Discussion

2853.	The ratio of number of collisions per second at thewalls of containers by He and O, gas moleculeskept at same volume and temperature, is (assumenormal incidence on walls)
Answer» The ratio of number of collisions per second at thewalls of containers by He and O, gas moleculeskept at same volume and temperature, is (assumenormal incidence on walls)

Discussion

2854.	How to balance the Photosynthesis Equation (CO2 + H2O ---> C6H12O6 + O2 + H2O? THE BALANCED EQUATION WILL BE OPTION A) 6 CO2 + 9 H2O ---> C6H12O6 + 3 H2O + 6 CO2 OPTION B) 6 CO2 + 12 H2O ---> C6H12O6 + 6 O2 + 6 H2O
Answer» How to balance the Photosynthesis Equation (CO2 + H2O ---> C6H12O6 + O2 + H2O? THE BALANCED EQUATION WILL BE OPTION A) 6 CO2 + 9 H2O ---> C6H12O6 + 3 H2O + 6 CO2 OPTION B) 6 CO2 + 12 H2O ---> C6H12O6 + 6 O2 + 6 H2O

Discussion

2855.	What is the relationship between Celsius and kelvin scale of temperature?explain.
Answer» What is the relationship between Celsius and kelvin scale of temperature?explain.

Discussion

2856.	plx explain the concept of conformational isomerism.
Answer» plx explain the concept of conformational isomerism.

Discussion

2857.	The ions having positive charges are called-
Answer» The ions having positive charges are called-

Discussion

2858.	compare the bond angles in carbonyl halides cof2,cocl2,cobr2,coI2
Answer» compare the bond angles in carbonyl halides cof2,cocl2,cobr2,coI2

Discussion

2859.	Which of the given compounds has the formula NaHCO3?
Answer» Which of the given compounds has the formula ${NaHCO}_{3}$ ?

Discussion

2860.	explain the dalton's atomic theory
Answer» explain the dalton's atomic theory

Discussion

2861.	Gold can be beaten into thin sheets because of its property of _______.
Answer» Gold can be beaten into thin sheets because of its property of _______.

Discussion

2862.	Wave number of first line of Lyman series for positronium atom is A)4R/2B)R/4C)3R/4D)3R/8
Answer» Wave number of first line of Lyman series for positronium atom is A)4R/2 B)R/4 C)3R/4 D)3R/8

Discussion

2863.	Name the radioactive isotope which is used in the treatment of cancer.
Answer» Name the radioactive isotope which is used in the treatment of cancer.

Discussion

2864.	integartion dy/3x+5 =
Answer» integartion dy/3x+5 =

Discussion

2865.	43.Why does diamond not have free electrons while graphite has?
Answer» 43.Why does diamond not have free electrons while graphite has?

Discussion

2866.	What happens when (a) a freshly prepared precipitate of Fe(OH)3 is shaken with a small amount of FeCl3 solution? (b) persistent dialysis of a colloidal solution is carried out? (c) an emulsion is centrifuged?
Answer» What happens when (a) a freshly prepared precipitate of $F e (O H)_{3}$ is shaken with a small amount of $F e C l_{3}$ solution? (b) persistent dialysis of a colloidal solution is carried out? (c) an emulsion is centrifuged?

Discussion

2867.	1. 5 ml of 8N HNO3 ,4.8 ml of 5N HCL and a certain volume of 7M H2SO4 are mixed together and made up to 2liter. 30 ml of this acid mixture exactly neutralizes 42.9 ml of Na2Co3 solution containing 1 gram of Na2Co3.10H2O in 100 ml of water calculate the volume of sulfuric acid used for making the solution
Answer» 1. 5 ml of 8N HNO3 ,4.8 ml of 5N HCL and a certain volume of 7M H2SO4 are mixed together and made up to 2liter. 30 ml of this acid mixture exactly neutralizes 42.9 ml of Na2Co3 solution containing 1 gram of Na2Co3.10H2O in 100 ml of water calculate the volume of sulfuric acid used for making the solution

Discussion

2868.	20 mL of acetic acid is present in 250 mL of vinegar. Find the volume by volume percentage of the solution.8
Answer» 20 mL of acetic acid is present in 250 mL of vinegar. Find the volume by volume percentage of the solution. 8

Discussion

2869.	Assuming complete ionisation, same mole of which of the following compounds will require the least amount of acidified KMnO4 for complete oxidation?
Answer» Assuming complete ionisation, same mole of which of the following compounds will require the least amount of acidified $K M n O_{4}$ for complete oxidation?

Discussion

2870.	In an experiment when heat is supplied to potassium chlorate (KClO3) it gives potassium chloride (KCl) and oxygen. What type of reaction is this?
Answer» In an experiment when heat is supplied to potassium chlorate (KClO₃) it gives potassium chloride (KCl) and oxygen. What type of reaction is this?

Discussion

2871.	If the fish is being fried in a neighburing home , we can semell it sitting in our own home . Name the process which brings this smell to us.
Answer» If the fish is being fried in a neighburing home , we can semell it sitting in our own home . Name the process which brings this smell to us.

Discussion

2872.	The formula of a compound is X3Y. The valencies of elements X and Y will be respectively:
Answer» The formula of a compound is $X_{3} Y$ . The valencies of elements X and Y will be respectively:

Discussion

2873.	A water is said to be hard if:
Answer» A water is said to be hard if:

Discussion

2874.	Balance the following equation stepwise.a. H2S2O7(l) + H2O(l) → H2SO4(l)b. SO2(g) + H2S(aq) → S(s) + H2O(l)c. Ag(s) + HCl(aq) → AgCl ↓+ H2 ↑d. NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + H2O(l)
Answer» Balance the following equation stepwise. a. H₂S₂O₇(l) + H₂O(l) → H₂SO₄(l) b. SO₂(g) + H₂S(aq) → S(s) + H₂O(l) c. Ag(s) + HCl(aq) → AgCl ↓+ H₂ ↑ d. NaOH(aq) + H₂SO₄(aq) → Na₂SO₄(aq) + H₂O(l)

Discussion

2875.	X+H2SO4→YY+K2Cr2O7+ H2SO4→ Green solution.Y is a colorless gas with irritating smell. X and Y are respectively:
Answer» $X + H_{2} S O_{4} \to Y$ $Y + K_{2} C r_{2} O_{7} +$ $H_{2} S O_{4} \to$ Green solution. $Y$ is a colorless gas with irritating smell. $X$ and $Y$ are respectively:

Discussion

2876.	Difference Between atom and ion
Answer» Difference Between atom and ion

Discussion

2877.	one amu is 1/12 of the mass of one c12 atom.(statement1) the correct reason for this statement will be with explaination
Answer» one amu is 1/12 of the mass of one c12 atom.(statement1) the correct reason for this statement will be with explaination

Discussion

2878.	The electronegativity of the following elements increase in the order-
Answer» The electronegativity of the following elements increase in the order-

Discussion

2879.	Write the reaction takes place in black and white photography. Explain
Answer» Write the reaction takes place in black and white photography. Explain

Discussion

2880.	What is the correct order of the below mentioned units in water purification system? 1) Chlorination tank 2) Loading tank 3) Sedimentation tank 4) Filtration tank
Answer» What is the correct order of the below mentioned units in water purification system? 1) Chlorination tank 2) Loading tank 3) Sedimentation tank 4) Filtration tank

Discussion

2881.	Why cannot be 4 electrons be shared between 2 atoms to form quanta bond ?
Answer» Why cannot be 4 electrons be shared between 2 atoms to form quanta bond ?

Discussion

2882.	Classify the substances given in the figure into elements and compounds.
Answer» Classify the substances given in the figure into elements and compounds.

Discussion

2883.	How atmospheric gases are liquefied
Answer» How atmospheric gases are liquefied

Discussion

2884.	Identify X in the following reaction:HCl (aq)+X→NaCl(s)+H2O + CO2
Answer» Identify X in the following reaction: $HCl (aq) + X \to NaCl (s) + H_{2} O$ + ${CO}_{2}$

Discussion

2885.	which of the following substrates is an electron donating group overall? Br, Coch3, och3,N(+)(CH3), ccl3
Answer» which of the following substrates is an electron donating group overall? Br, Coch3, och3,N(+)(CH3), ccl3

Discussion

2886.	The covalent radius of nitrogen is 70 pm. Hence covalent radius of boron is about -
Answer» The covalent radius of nitrogen is 70 pm. Hence covalent radius of boron is about -

Discussion

2887.	Give reason for the following observations : The smell of hot sizzling food reaches u several meters away but to get the smell from cold food u have to go close
Answer» Give reason for the following observations : The smell of hot sizzling food reaches u several meters away but to get the smell from cold food u have to go close

2887.

Give reason for the following observations : The smell of hot sizzling food reaches u several meters away but to get the smell from cold food u have to go close

Answer»

Give reason for the following observations :

The smell of hot sizzling food reaches u several meters away but to get the smell from cold food u have to go close

Discussion

2888.	Which of the following will form a homogeneous mixture?
Answer» Which of the following will form a homogeneous mixture?

Discussion

2889.	what is 1. cooper constontam 2.multiple gases 3. partical prassure 4.seeback effect 5.wheat stone 6. fiuctuatins tempreture
Answer» what is 1. cooper constontam 2.multiple gases 3. partical prassure 4.seeback effect 5.wheat stone 6. fiuctuatins tempreture

Discussion

2890.	What kind of matter is fire?
Answer» What kind of matter is fire?

Discussion

2891.	Name (a) An alkali metal in period 3 and halogen in period 2. (b) The noble gas with 3 shells. (c) The non-metals present in period 2 and metals in period 3. (d) The element of period 3 with valency 4. (e) The elements i period 3 which does not form oxide. (f) The element of lower nuclear charge out of Be and Mg. (g) Which has higher E.A., Fluorine or Neon. (h) Which has maximum metallic character Na, Li or K.
Answer» Name (a) An alkali metal in period 3 and halogen in period 2. (b) The noble gas with 3 shells. (c) The non-metals present in period 2 and metals in period 3. (d) The element of period 3 with valency 4. (e) The elements i period 3 which does not form oxide. (f) The element of lower nuclear charge out of Be and Mg. (g) Which has higher E.A., Fluorine or Neon. (h) Which has maximum metallic character Na, Li or K.

2891.

Name (a) An alkali metal in period 3 and halogen in period 2. (b) The noble gas with 3 shells. (c) The non-metals present in period 2 and metals in period 3. (d) The element of period 3 with valency 4. (e) The elements i period 3 which does not form oxide. (f) The element of lower nuclear charge out of Be and Mg. (g) Which has higher E.A., Fluorine or Neon. (h) Which has maximum metallic character Na, Li or K.

Answer»

Name

(a) An alkali metal in period 3 and halogen in period 2.

(b) The noble gas with 3 shells.

(c) The non-metals present in period 2 and metals in period 3.

(d) The element of period 3 with valency 4.

(e) The elements i period 3 which does not form oxide.

(f) The element of lower nuclear charge out of Be and Mg.

(g) Which has higher E.A., Fluorine or Neon.

(h) Which has maximum metallic character Na, Li or K.

Discussion

2892.	Name the gas that evolved at cathode and anode when water is electrolysed. State their ratio by volume.
Answer» Name the gas that evolved at cathode and anode when water is electrolysed. State their ratio by volume.

Discussion

2893.	51.which reaction is possible ? (a)KCl3+Br2 (b)KBrO3+Cl2 (c)KIO3+Br2 (d)KBrO3+I2
Answer» 51.which reaction is possible ? (a)KCl3+Br2 (b)KBrO3+Cl2 (c)KIO3+Br2 (d)KBrO3+I2

Discussion

2894.	Question 9 (b) Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below: Write a balanced chemical equation for the reaction taking place.
Answer» Question 9 (b) Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below: Write a balanced chemical equation for the reaction taking place.

2894.

Question 9 (b) Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below: Write a balanced chemical equation for the reaction taking place.

Answer»

Question 9 (b)

Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below:

Write a balanced chemical equation for the reaction taking place.

Discussion

2895.	23.A mixture of 50 ml of H2 and 50 ml of O2 is allowed to effuse through an effusometer till the residual gas occupies 90 ml. What is the composition of effused gas and residual gas
Answer» 23.A mixture of 50 ml of H2 and 50 ml of O2 is allowed to effuse through an effusometer till the residual gas occupies 90 ml. What is the composition of effused gas and residual gas

Discussion

2896.	How to calculate valency of element having atomic number more than 20. For ex,iron,manganese,copper,etc
Answer» How to calculate valency of element having atomic number more than 20. For ex,iron,manganese,copper,etc

Discussion

2897.	The size of particles of a matter can be best described as _________
Answer» The size of particles of a matter can be best described as _________

Discussion

2898.	(a) Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not? (b) How would you prepare a saturated solution of sodium chloride in water at 25∘C ? What will happen if this solution is cooled to 10∘C ?
Answer» (a) Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not? (b) How would you prepare a saturated solution of sodium chloride in water at $25^{\circ} C$ ? What will happen if this solution is cooled to $10^{\circ} C ?$

2898.

(a) Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not? (b) How would you prepare a saturated solution of sodium chloride in water at 25∘C ? What will happen if this solution is cooled to 10∘C ?

Answer»

(a) Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not?

(b) How would you prepare a saturated solution of sodium chloride in water at $25^{\circ} C$ ? What will happen if this solution is cooled to $10^{\circ} C ?$

Discussion

2899.	What is an ion, anion and cation? Give example for each.
Answer» What is an ion, anion and cation? Give example for each.

Discussion

2900.	Why only 18.01 grams of water has 6.022×10^23 why not in any other mass
Answer» Why only 18.01 grams of water has 6.022×10^23 why not in any other mass

Discussion

Explore topic-wise InterviewSolutions in .

Addition of potassium chromate to a solution gives yellow precipitate. This confirms the presence of _____ cation in it.

If the size of the nucleus is 10^-15 is scaled upto the tip of a shrp pin (10^-5), then what is the size of the atom?

The ratio of number of collisions per second at thewalls of containers by He and O, gas moleculeskept at same volume and temperature, is (assumenormal incidence on walls)

How to balance the Photosynthesis Equation (CO2 + H2O ---> C6H12O6 + O2 + H2O? THE BALANCED EQUATION WILL BE OPTION A) 6 CO2 + 9 H2O ---> C6H12O6 + 3 H2O + 6 CO2 OPTION B) 6 CO2 + 12 H2O ---> C6H12O6 + 6 O2 + 6 H2O

What is the relationship between Celsius and kelvin scale of temperature?explain.

plx explain the concept of conformational isomerism.

The ions having positive charges are called-

compare the bond angles in carbonyl halides cof2,cocl2,cobr2,coI2

Which of the given compounds has the formula NaHCO3?

explain the dalton's atomic theory

Gold can be beaten into thin sheets because of its property of _______.

Wave number of first line of Lyman series for positronium atom is A)4R/2B)R/4C)3R/4D)3R/8

Name the radioactive isotope which is used in the treatment of cancer.

integartion dy/3x+5 =

43.Why does diamond not have free electrons while graphite has?

What happens when (a) a freshly prepared precipitate of Fe(OH)3 is shaken with a small amount of FeCl3 solution? (b) persistent dialysis of a colloidal solution is carried out? (c) an emulsion is centrifuged?

20 mL of acetic acid is present in 250 mL of vinegar. Find the volume by volume percentage of the solution.8

Assuming complete ionisation, same mole of which of the following compounds will require the least amount of acidified KMnO4 for complete oxidation?

In an experiment when heat is supplied to potassium chlorate (KClO3) it gives potassium chloride (KCl) and oxygen. What type of reaction is this?

If the fish is being fried in a neighburing home , we can semell it sitting in our own home . Name the process which brings this smell to us.

The formula of a compound is X3Y. The valencies of elements X and Y will be respectively:

A water is said to be hard if:

Balance the following equation stepwise.a. H2S2O7(l) + H2O(l) → H2SO4(l)b. SO2(g) + H2S(aq) → S(s) + H2O(l)c. Ag(s) + HCl(aq) → AgCl ↓+ H2 ↑d. NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + H2O(l)

X+H2SO4→YY+K2Cr2O7+ H2SO4→ Green solution.Y is a colorless gas with irritating smell. X and Y are respectively:

Difference Between atom and ion

one amu is 1/12 of the mass of one c12 atom.(statement1) the correct reason for this statement will be with explaination

The electronegativity of the following elements increase in the order-

Write the reaction takes place in black and white photography. Explain

What is the correct order of the below mentioned units in water purification system? 1) Chlorination tank 2) Loading tank 3) Sedimentation tank 4) Filtration tank

Why cannot be 4 electrons be shared between 2 atoms to form quanta bond ?

Classify the substances given in the figure into elements and compounds.

How atmospheric gases are liquefied

Identify X in the following reaction:HCl (aq)+X→NaCl(s)+H2O + CO2

which of the following substrates is an electron donating group overall? Br, Coch3, och3,N(+)(CH3), ccl3

The covalent radius of nitrogen is 70 pm. Hence covalent radius of boron is about -

Give reason for the following observations : The smell of hot sizzling food reaches u several meters away but to get the smell from cold food u have to go close

Which of the following will form a homogeneous mixture?

what is 1. cooper constontam 2.multiple gases 3. partical prassure 4.seeback effect 5.wheat stone 6. fiuctuatins tempreture

What kind of matter is fire?

Name the gas that evolved at cathode and anode when water is electrolysed. State their ratio by volume.

51.which reaction is possible ? (a)KCl3+Br2 (b)KBrO3+Cl2 (c)KIO3+Br2 (d)KBrO3+I2

Question 9 (b) Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below: Write a balanced chemical equation for the reaction taking place.

23.A mixture of 50 ml of H2 and 50 ml of O2 is allowed to effuse through an effusometer till the residual gas occupies 90 ml. What is the composition of effused gas and residual gas

How to calculate valency of element having atomic number more than 20. For ex,iron,manganese,copper,etc

The size of particles of a matter can be best described as _________

(a) Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not? (b) How would you prepare a saturated solution of sodium chloride in water at 25∘C ? What will happen if this solution is cooled to 10∘C ?

What is an ion, anion and cation? Give example for each.

Why only 18.01 grams of water has 6.022×10^23 why not in any other mass