10223 + Interview Questions in Chemistry Page 52 InterviewSolution

2551.	Water drops appear on the outer surface of a glass containing cold water. Give a suitable reason for this occurance.
Answer» Water drops appear on the outer surface of a glass containing cold water. Give a suitable reason for this occurance.

Discussion

2552.	You have two solutions, A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration? Which of this is acidic and which one is basic?
Answer» You have two solutions, A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration? Which of this is acidic and which one is basic?

Discussion

2553.	Paheli prepared a blue coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojho prepared a yellowish green solution of ferrous sulphate in beaker B and placed a copper wire in it. What changes will they observe in the two beakers after an hour?
Answer» Paheli prepared a blue coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojho prepared a yellowish green solution of ferrous sulphate in beaker B and placed a copper wire in it. What changes will they observe in the two beakers after an hour?

Discussion

2554.	If argon contains only 1 atom (Ar) how can we call it as a molecule? because in my text book its given that "MOLECULES of many element such as argon (Ar), helium (He) ..etc are made of only 1 type of atom". If they are made of only 1 tyoe of atom, how can it be callled as a molecule?
Answer» If argon contains only 1 atom (Ar) how can we call it as a molecule? because in my text book its given that "MOLECULES of many element such as argon (Ar), helium (He) ..etc are made of only 1 type of atom". If they are made of only 1 tyoe of atom, how can it be callled as a molecule?

Discussion

2555.	Difference between molecule and formula unit
Answer» Difference between molecule and formula unit

Discussion

2556.	Which of the following element has duplet as outermost electronic configuration?
Answer» Which of the following element has duplet as outermost electronic configuration?

Discussion

2557.	Explain law of reciprocal proportion
Answer» Explain law of reciprocal proportion

Discussion

2558.	Complete combustion of 1.80 g of an oxygen-containing compound (CxHyOz) gave 2.64 g of CO2 and 1.08 g of H2O. The percentage of oxygen in the organic compound is:
Answer» Complete combustion of $1.80 g$ of an oxygen-containing compound $(C_{x} H_{y} O_{z})$ gave $2.64 g$ of $C O_{2}$ and $1.08 g$ of $H_{2} O .$ The percentage of oxygen in the organic compound is:

Discussion

2559.	74. How to assign the appropriate group and period to an element whose atomic number is given to us
Answer» 74. How to assign the appropriate group and period to an element whose atomic number is given to us

Discussion

2560.	What is a combination reaction?
Answer» What is a combination reaction?

Discussion

2561.	49. glucose is added to water such that the mole fraction of water become 0.8 the boiling point of solution is (given kb for water is 0.52 k kg /mol)
Answer» 49. glucose is added to water such that the mole fraction of water become 0.8 the boiling point of solution is (given kb for water is 0.52 k kg /mol)

Discussion

2562.	Increase in the amount of CO2 in air results in:
Answer» Increase in the amount of $C O_{2}$ in air results in:

Discussion

2563.	Explain the following temperature vs time graph.
Answer» Explain the following temperature vs time graph.

Discussion

2564.	Beriliyum has diagonal relationship with__________
Answer» Beriliyum has diagonal relationship with__________

Discussion

2565.	Write the number of electrons present in the outermost shells of the following elements.Lithium, carbon, oxygen, and sodium.
Answer» Write the number of electrons present in the outermost shells of the following elements. Lithium, carbon, oxygen, and sodium.

Discussion

2566.	Choose the correctCapacitance of a capacitor does not depend on -(A) size of plates(B)shape of plates (C)seperation between plates(D)charges on plate
Answer» Choose the correct Capacitance of a capacitor does not depend on - (A) size of plates (B)shape of plates (C)seperation between plates (D)charges on plate

Discussion

2567.	Write a simple defination of colloidal solution? With one example.
Answer» Write a simple defination of colloidal solution? With one example.

Discussion

2568.	39. Calculate the number of H+ present in 1ml of a solution whose pH is 4.(Na=avogadro's number)
Answer» 39. Calculate the number of H+ present in 1ml of a solution whose pH is 4.(Na=avogadro's number)

Discussion

2569.	‘The Flying Shuttle’ was invented by
Answer» ‘The Flying Shuttle’ was invented by

Discussion

2570.	How to calculate avg. Atomic mass?
Answer» How to calculate avg. Atomic mass?

Discussion

2571.	There are 1010 radioactive nuclei in a given radioactive element. Its half-life time is 1 minute. How many nuclei will remain after 30 seconds?(Take √2=1.414)
Answer» There are $10^{10}$ radioactive nuclei in a given radioactive element. Its half-life time is $1$ minute. How many nuclei will remain after $30$ seconds? (Take $\sqrt{2} = 1.414$ )

Discussion

2572.	(a) Fresh milk has a pH of 6. When it changes into curd (yogurt), will its pH value increase or decrease? Why?(b) Name the gas evolved when dilute HCl reacts with sodium hydrogencarbonate. How is it recognised?(c) On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green. Predict the new compound formed which imparts a blue-green colour to the solution.
Answer» (a) Fresh milk has a pH of 6. When it changes into curd (yogurt), will its pH value increase or decrease? Why? (b) Name the gas evolved when dilute HCl reacts with sodium hydrogencarbonate. How is it recognised? (c) On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green. Predict the new compound formed which imparts a blue-green colour to the solution.

Discussion

2573.	How will you prepare a) A mixture of iron filings and sulphur b) A compound formed by iron and sulphur
Answer» How will you prepare a) A mixture of iron filings and sulphur b) A compound formed by iron and sulphur

2573.

How will you prepare a) A mixture of iron filings and sulphur b) A compound formed by iron and sulphur

Answer»

How will you prepare

a) A mixture of iron filings and sulphur

b) A compound formed by iron and sulphur

Discussion

2574.	50g of saturated solution of NaCl at 300C is evaporated to dryness and 13.2g of dry NaCl was obtained. Find the solubility of NaCl at 300C in water.
Answer» 50g of saturated solution of NaCl at $30^{0} C$ is evaporated to dryness and 13.2g of dry NaCl was obtained. Find the solubility of NaCl at $30^{0} C$ in water.

Discussion

2575.	Question 2 (v) Write down the names of compounds represented by the following formulae: (v) CaCO3
Answer» Question 2 (v) Write down the names of compounds represented by the following formulae: $(v) C a C O_{3}$

Discussion

2576.	29. In a 0.25L tube dissociation of 4 mol of NO is take place. If its degree of dissociation is 10%. The value of Kp for b reaction 2NO gives N+O2
Answer» 29. In a 0.25L tube dissociation of 4 mol of NO is take place. If its degree of dissociation is 10%. The value of Kp for b reaction 2NO gives N+O2

Discussion

2577.	11. The energy of 2s orbital is less than the energy of 2p orbitals in case of hydrogen like atoms, is it correct ??
Answer» 11. The energy of 2s orbital is less than the energy of 2p orbitals in case of hydrogen like atoms, is it correct ??

Discussion

2578.	One volume of a gaseous compound of c h and n gave upon combustion 2 vol of CO2 3.5 vol of h2o and 0.5 vol of n2. What is the formula of the compund
Answer» One volume of a gaseous compound of c h and n gave upon combustion 2 vol of CO2 3.5 vol of h2o and 0.5 vol of n2. What is the formula of the compund

Discussion

2579.	In the electrolysis of acidulated water, _______ gas is evolved at the anode.
Answer» In the electrolysis of acidulated water, _______ gas is evolved at the anode.

Discussion

2580.	why benzylic free radicle is more stable than allyl.
Answer» why benzylic free radicle is more stable than allyl.

Discussion

2581.	Why Nitrogen forms one sigma and one pi bond with oxygen in the compound NO though nitrogen's valency is 3.
Answer» Why Nitrogen forms one sigma and one pi bond with oxygen in the compound NO though nitrogen's valency is 3.

Discussion

2582.	45. 200W bulb of wavelength 0.6um .Assuming it to be 100% efficient in converting electrical energy to light ,the number of photons it emit per second is?
Answer» 45. 200W bulb of wavelength 0.6um .Assuming it to be 100% efficient in converting electrical energy to light ,the number of photons it emit per second is?

Discussion

2583.	Calculate the number of atoms in 1 mole of nitrogen (N2) ?
Answer» Calculate the number of atoms in 1 mole of nitrogen (N2) ?

Discussion

2584.	The product obtained on passing excess carbon dioxide through lime water is ___
Answer» The product obtained on passing excess carbon dioxide through lime water is ___

Discussion

2585.	Out of a colloid, solution and a suspension: (a) Which one has the smallest particles? (b) Which one has the largest particles?
Answer» Out of a colloid, solution and a suspension: (a) Which one has the smallest particles? (b) Which one has the largest particles?

2585.

Out of a colloid, solution and a suspension: (a) Which one has the smallest particles? (b) Which one has the largest particles?

Answer»

Out of a colloid, solution and a suspension:

(a) Which one has the smallest particles?

(b) Which one has the largest particles?

Discussion

2586.	What is meany by shell and sub shell ?
Answer» What is meany by shell and sub shell ?

Discussion

2587.	9. What is the charge on 1g ion of N3- ?
Answer» 9. What is the charge on 1g ion of N3- ?

Discussion

2588.	30.Which molecule has minimum bond angle _NH3 ,H2O , AsH3 ,CH4
Answer» 30.Which molecule has minimum bond angle _NH3 ,H2O , AsH3 ,CH4

Discussion

2589.	In which of the following reactions, NO gas will be liberated?[1 Mark]
Answer» In which of the following reactions, $N O$ gas will be liberated? [1 Mark]

Discussion

2590.	The general structural formula of alkanes is:
Answer» The general structural formula of alkanes is:

Discussion

2591.	what are the structures of: 1)wood spirit 2)tetrahydrofurane
Answer» what are the structures of: 1)wood spirit 2)tetrahydrofurane

Discussion

2592.	56.energy required to ionize 1 mole of gaseous Helium Ion present in its ground state is
Answer» 56.energy required to ionize 1 mole of gaseous Helium Ion present in its ground state is

Discussion

2593.	NAMES OF COMPONENTS: NH4CL, MD[NO3]2, PB3[PO4]2
Answer» NAMES OF COMPONENTS: NH4CL, MD[NO3]2, PB3[PO4]2

Discussion

2594.	Explain the formation of (i) sodium ion, and (ii) chloride ion, from their respective atoms giving the number of protons and number of electrons in each one of them. What is the reason for positive charge on a sodium ion and negative charge on a chloride ion?
Answer» Explain the formation of (i) sodium ion, and (ii) chloride ion, from their respective atoms giving the number of protons and number of electrons in each one of them. What is the reason for positive charge on a sodium ion and negative charge on a chloride ion?

Discussion

2595.	How to calculate atomic mass
Answer» How to calculate atomic mass

Discussion

2596.	the number of electrons present in 1.8 g of water is? how are 10 electrons present in water?
Answer» the number of electrons present in 1.8 g of water is? how are 10 electrons present in water?

Discussion

2597.	WHY PHOSPHORUS HAS 2 VALENCY(3,5) ?
Answer» WHY PHOSPHORUS HAS 2 VALENCY(3,5) ?

Discussion

2598.	How do you identify single, double and triple bonds?
Answer» How do you identify single, double and triple bonds?

Discussion

2599.	(a) What is the nucleus of an atom and what is the nature of charge on it? (b) Name the scientist who discovered the nucleus of an atom.
Answer» (a) What is the nucleus of an atom and what is the nature of charge on it? (b) Name the scientist who discovered the nucleus of an atom.

Discussion

2600.	Heat of dissociation of CH3COOH is 0.005kcal g–1, hence enthalpy change when 1 mole ofCa(OH)2 is completely neutralised by CH3COOHis(a) – 27.4 kcal (b) – 13.6 kcal(c) – 26.8 kcal (d) – 27.1 kcal
Answer» Heat of dissociation of CH3COOH is 0.005 kcal g–1, hence enthalpy change when 1 mole of Ca(OH)2 is completely neutralised by CH3COOH is (a) – 27.4 kcal (b) – 13.6 kcal (c) – 26.8 kcal (d) – 27.1 kcal

Discussion

Explore topic-wise InterviewSolutions in .

Water drops appear on the outer surface of a glass containing cold water. Give a suitable reason for this occurance.

You have two solutions, A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration? Which of this is acidic and which one is basic?

Paheli prepared a blue coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojho prepared a yellowish green solution of ferrous sulphate in beaker B and placed a copper wire in it. What changes will they observe in the two beakers after an hour?

If argon contains only 1 atom (Ar) how can we call it as a molecule? because in my text book its given that "MOLECULES of many element such as argon (Ar), helium (He) ..etc are made of only 1 type of atom". If they are made of only 1 tyoe of atom, how can it be callled as a molecule?

Difference between molecule and formula unit

Which of the following element has duplet as outermost electronic configuration?

Explain law of reciprocal proportion

Complete combustion of 1.80 g of an oxygen-containing compound (CxHyOz) gave 2.64 g of CO2 and 1.08 g of H2O. The percentage of oxygen in the organic compound is:

74. How to assign the appropriate group and period to an element whose atomic number is given to us

What is a combination reaction?

49. glucose is added to water such that the mole fraction of water become 0.8 the boiling point of solution is (given kb for water is 0.52 k kg /mol)

Increase in the amount of CO2 in air results in:

Explain the following temperature vs time graph.

Beriliyum has diagonal relationship with__________

Write the number of electrons present in the outermost shells of the following elements.Lithium, carbon, oxygen, and sodium.

Choose the correctCapacitance of a capacitor does not depend on -(A) size of plates(B)shape of plates (C)seperation between plates(D)charges on plate

Write a simple defination of colloidal solution? With one example.

39. Calculate the number of H+ present in 1ml of a solution whose pH is 4.(Na=avogadro's number)

‘The Flying Shuttle’ was invented by

How to calculate avg. Atomic mass?

There are 1010 radioactive nuclei in a given radioactive element. Its half-life time is 1 minute. How many nuclei will remain after 30 seconds?(Take √2=1.414)

How will you prepare a) A mixture of iron filings and sulphur b) A compound formed by iron and sulphur

50g of saturated solution of NaCl at 300C is evaporated to dryness and 13.2g of dry NaCl was obtained. Find the solubility of NaCl at 300C in water.

Question 2 (v) Write down the names of compounds represented by the following formulae: (v) CaCO3

29. In a 0.25L tube dissociation of 4 mol of NO is take place. If its degree of dissociation is 10%. The value of Kp for b reaction 2NO gives N+O2

11. The energy of 2s orbital is less than the energy of 2p orbitals in case of hydrogen like atoms, is it correct ??

One volume of a gaseous compound of c h and n gave upon combustion 2 vol of CO2 3.5 vol of h2o and 0.5 vol of n2. What is the formula of the compund

In the electrolysis of acidulated water, _______ gas is evolved at the anode.

why benzylic free radicle is more stable than allyl.

Why Nitrogen forms one sigma and one pi bond with oxygen in the compound NO though nitrogen's valency is 3.

45. 200W bulb of wavelength 0.6um .Assuming it to be 100% efficient in converting electrical energy to light ,the number of photons it emit per second is?

Calculate the number of atoms in 1 mole of nitrogen (N2) ?

The product obtained on passing excess carbon dioxide through lime water is ___

Out of a colloid, solution and a suspension: (a) Which one has the smallest particles? (b) Which one has the largest particles?

What is meany by shell and sub shell ?

9. What is the charge on 1g ion of N3- ?

30.Which molecule has minimum bond angle _NH3 ,H2O , AsH3 ,CH4

In which of the following reactions, NO gas will be liberated?[1 Mark]

The general structural formula of alkanes is:

what are the structures of: 1)wood spirit 2)tetrahydrofurane

56.energy required to ionize 1 mole of gaseous Helium Ion present in its ground state is

NAMES OF COMPONENTS: NH4CL, MD[NO3]2, PB3[PO4]2

Explain the formation of (i) sodium ion, and (ii) chloride ion, from their respective atoms giving the number of protons and number of electrons in each one of them. What is the reason for positive charge on a sodium ion and negative charge on a chloride ion?

How to calculate atomic mass

the number of electrons present in 1.8 g of water is? how are 10 electrons present in water?

WHY PHOSPHORUS HAS 2 VALENCY(3,5) ?

How do you identify single, double and triple bonds?

(a) What is the nucleus of an atom and what is the nature of charge on it? (b) Name the scientist who discovered the nucleus of an atom.

Heat of dissociation of CH3COOH is 0.005kcal g–1, hence enthalpy change when 1 mole ofCa(OH)2 is completely neutralised by CH3COOHis(a) – 27.4 kcal (b) – 13.6 kcal(c) – 26.8 kcal (d) – 27.1 kcal