7248 + Interview Questions in Chemistry Page 10 InterviewSolution

451.	Question 16Which of the following in figure do not represent Bohr's model of an atom correctly?(a) (i) and (ii)(b) (ii) and (iii)(c) (ii) and (iv)(d) (i) and (iv)
Answer» Question 16 Which of the following in figure do not represent Bohr's model of an atom correctly? (a) (i) and (ii) (b) (ii) and (iii) (c) (ii) and (iv) (d) (i) and (iv)

Discussion

452.	Why is natural gas called a clean fuel ?
Answer» Why is natural gas called a clean fuel ?

Discussion

453.	Identify the biodegradable materials from the given options.
Answer» Identify the biodegradable materials from the given options.

Discussion

454.	What type of mixtures are separated by the technique of crystallisation?
Answer» What type of mixtures are separated by the technique of crystallisation?

Discussion

455.	CuSO4 (aq) + H2S (g) → CuS (ppt) + H2SO4(aq) What is the colour of precipitate formed in the above precipitation reaction?
Answer» $C u S O_{4} (a q) + H_{2} S (g) \to C u S (p p t) + H_{2} S O_{4} (a q)$ What is the colour of precipitate formed in the above precipitation reaction?

455.

CuSO4 (aq) + H2S (g) → CuS (ppt) + H2SO4(aq) What is the colour of precipitate formed in the above precipitation reaction?

Answer»

$C u S O_{4} (a q) + H_{2} S (g) \to C u S (p p t) + H_{2} S O_{4} (a q)$

What is the colour of precipitate formed in the above precipitation reaction?

Discussion

456.	Where do we get to see HCl in free state?
Answer» Where do we get to see HCl in free state?

Discussion

457.	How phitkari helps in water clear
Answer» How phitkari helps in water clear

Discussion

458.	Which is the most stable element of the periodic table?
Answer» Which is the most stable element of the periodic table?

Discussion

459.	Two bodies A and B are brought into contact with one another and heat flow from A to B. Which of the following statement is/are true?
Answer» Two bodies A and B are brought into contact with one another and heat flow from A to B. Which of the following statement is/are true?

Discussion

460.	In the metallurgy of iron, during smelting process, CO is main reducing agent at the upper of blast furnace, because: (1) It is less concentrated in upper atmosphere (2) The CO2 formed can be easily removed (3) In the lower atmosphere, there is no oxide to be reduced (4) The entropy change during CO/CO is negative
Answer» In the metallurgy of iron, during smelting process, CO is main reducing agent at the upper of blast furnace, because: (1) It is less concentrated in upper atmosphere (2) The CO2 formed can be easily removed (3) In the lower atmosphere, there is no oxide to be reduced (4) The entropy change during CO/CO is negative

Discussion

461.	What is meant by separation? Answer in detail.
Answer» What is meant by separation? Answer in detail.

Discussion

462.	In the rusting of Iron, which of the following cell reactions occurs at the anode?
Answer» In the rusting of Iron, which of the following cell reactions occurs at the anode?

Discussion

463.	From amongst the metals sodium, calcium, aluminium, copper and magnesium, name the metal:(a) which reacts with water only on boiling, and(b) another which does not react even with steam.
Answer» From amongst the metals sodium, calcium, aluminium, copper and magnesium, name the metal: (a) which reacts with water only on boiling, and (b) another which does not react even with steam.

Discussion

464.	In cathode ray experiment why does only electron move to protons Why not protons move to electron? Please tell me now because I have test tomorrow?
Answer» In cathode ray experiment why does only electron move to protons Why not protons move to electron? Please tell me now because I have test tomorrow?

464.

In cathode ray experiment why does only electron move to protons Why not protons move to electron? Please tell me now because I have test tomorrow?

Answer»

In cathode ray experiment why does only electron move to protons

Why not protons move to electron? Please tell me now because I have test tomorrow?

Discussion

465.	Which of the following is the main source of carbon monoxide (CO)?
Answer» Which of the following is the main source of carbon monoxide (CO)?

Discussion

466.	Lithium is a metal whose electronic configuration is 2 and 1 including 3 protons 3 electrons and 3 neutrons. So, if we remove 1 electron from lithium to make it stable. Then ,why would we call it lithium as it has 3 protons 3 electrons and 3 neutrons. But , after removal of 1 electron only 2 electrons are left. So, why would we call it lithium then.
Answer» Lithium is a metal whose electronic configuration is 2 and 1 including 3 protons 3 electrons and 3 neutrons. So, if we remove 1 electron from lithium to make it stable. Then ,why would we call it lithium as it has 3 protons 3 electrons and 3 neutrons. But , after removal of 1 electron only 2 electrons are left. So, why would we call it lithium then.

Discussion

467.	Comment on the following. Periodic changes. Non-periodic changes.
Answer» Comment on the following. Periodic changes. Non-periodic changes.

467.

Comment on the following. Periodic changes. Non-periodic changes.

Answer»

Comment on the following.

Periodic changes.

Non-periodic changes.

Discussion

468.	Rolling of chapatti is an example of physical change and baking of chapatti is an example of _______ change.
Answer» Rolling of chapatti is an example of physical change and baking of chapatti is an example of _______ change.

Discussion

469.	10.Two walls of thickness d1 and d2 thermal conductivites k1 and k2 are un contact. In the steady state if temp at outer surface are T1 and T2 the temperature at the common wall will be ??
Answer» 10.Two walls of thickness d1 and d2 thermal conductivites k1 and k2 are un contact. In the steady state if temp at outer surface are T1 and T2 the temperature at the common wall will be ??

Discussion

470.	Which metals form oxide and which form Hydroxide?
Answer» Which metals form oxide and which form Hydroxide?

Discussion

471.	The Brownian motion is due to:?
Answer» The Brownian motion is due to:?

Discussion

472.	Plastic commonly used to make bottles as it is:
Answer» Plastic commonly used to make bottles as it is:

Discussion

473.	alloys are formed by atoms with metallic radii that are within about 15 percent of each other.What does that mean?
Answer» alloys are formed by atoms with metallic radii that are within about 15 percent of each other.What does that mean?

Discussion

474.	How many of the following nitrates of metal M decompose on heating similar to as given below in the scheme?where M: Li, Be, Mg, K, Ca, Sr, Na, Rb, BaMetal nitrateheat−−→Metal oxide+Nitrogen dioxide+oxygen gas
Answer» How many of the following nitrates of metal $M$ decompose on heating similar to as given below in the scheme? where $M : L i, B e, M g, K, C a, S r, N a, R b, B a$ $Metal nitrate heat - - \to Metal oxide + Nitrogen dioxide + oxygen gas$

Discussion

475.	Which of the following can be used to extract the water trapped in aquifers?
Answer» Which of the following can be used to extract the water trapped in aquifers?

Discussion

476.	Number of P-O-P linkage present in P_4O_6, P_4O_{12}^{-4 } and P_3O_9^{-3} respectively are:
Answer» Number of P-O-P linkage present in P_4O_6, P_4O_{12}^{-4 } and P_3O_9^{-3} respectively are:

Discussion

477.	Which of the following is a metal?
Answer» Which of the following is a metal?

Discussion

478.	How to take out bacisity of an acid simple trick and what is the n factor of NH3
Answer» How to take out bacisity of an acid simple trick and what is the n factor of NH3

Discussion

479.	How do the solubility of a solid and a gas gets affected by (a) Increase in temperature ? (b) Increase in pressure ?
Answer» How do the solubility of a solid and a gas gets affected by (a) Increase in temperature ? (b) Increase in pressure ?

479.

How do the solubility of a solid and a gas gets affected by (a) Increase in temperature ? (b) Increase in pressure ?

Answer»

How do the solubility of a solid and a gas gets affected by

(a) Increase in temperature ?

(b) Increase in pressure ?

Discussion

480.	In an experiment to measure the pH values of solutions, a student placed strips of universal indicator paper in four beakers containing solutions A, B, C and D. The colour of universal indicator paper in these solutions is as shown below :The solution having lowest pH value is:(1) A(2) B(3) C(4) D
Answer» In an experiment to measure the pH values of solutions, a student placed strips of universal indicator paper in four beakers containing solutions A, B, C and D. The colour of universal indicator paper in these solutions is as shown below : The solution having lowest pH value is: (1) A (2) B (3) C (4) D

Discussion

481.	In a first order reaction, the concentration of the reactant is reduced to 12.5% in one hour. When was it half completed?
Answer» In a first order reaction, the concentration of the reactant is reduced to $12.5 %$ in one hour. When was it half completed?

Discussion

482.	Question 3(ii)Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows:MetalIron(II)sulphateCooper(II)sulphateZinc sulphateSilver nitrateA.No reactionDisplacementB.DisplacementNo reactionC.No reactionNo reactionNo reactionDisplacementD.No reactionNo reactionNo reactionNo reactionUse the Table above to answer the following questions about metals A, B, C and D.(ii) What would you observe if B is added to a solution of copper (II) sulphate?
Answer» Question 3(ii) Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows: $\begin{matrix} M e t a l & I r o n (I I) s u l p h a t e & C o o p e r (I I) s u l p h a t e & Z i n c s u l p h a t e & S i l v e r n i t r a t e A . & N o r e a c t i o n & D i s p l a c e m e n t B . & D i s p l a c e m e n t & N o r e a c t i o n C . & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n & D i s p l a c e m e n t D . & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n \end{matrix}$ Use the Table above to answer the following questions about metals A, B, C and D. (ii) What would you observe if B is added to a solution of copper (II) sulphate?

Discussion

483.	A mixture of CH4 and C2H4 in Volume ratio x:y has atotal volume of 30ml . On complete combustion it gives 40ml Co2 . If ratio had been y:x instead of x:y what volume of Co2 had been obtained?
Answer» A mixture of CH4 and C2H4 in Volume ratio x:y has atotal volume of 30ml . On complete combustion it gives 40ml Co2 . If ratio had been y:x instead of x:y what volume of Co2 had been obtained?

Discussion

484.	Although wood has a very high calorific value, we still discourage its use as a fuel. Explain.
Answer» Although wood has a very high calorific value, we still discourage its use as a fuel. Explain.

Discussion

485.	What type of solvent is partially polar aprotic solvent is??
Answer» What type of solvent is partially polar aprotic solvent is??

Discussion

486.	What term is also same as the number of protons and the number of electrons of a neutral atom?
Answer» What term is also same as the number of protons and the number of electrons of a neutral atom?

Discussion

487.	For the reaction, PbO + H2 → Pb + H2O. Which of the following statements is incorrect?
Answer» For the reaction, PbO + H₂ → Pb + H₂O. Which of the following statements is incorrect?

Discussion

488.	Write any four metals and non metals. Write it's physical properties, chemical properties and its uses
Answer» Write any four metals and non metals. Write it's physical properties, chemical properties and its uses

Discussion

489.	Question 22 (iv) Fill in the blanks (iv) A fibre similar to wool is ___.
Answer» Question 22 (iv) Fill in the blanks (iv) A fibre similar to wool is ___.

Discussion

490.	The kinetic energy of a simple harmonic motion when the particle is half way to its end point
Answer» The kinetic energy of a simple harmonic motion when the particle is half way to its end point

Discussion

491.	Which substance will produce flame on burning?
Answer» Which substance will produce flame on burning?

Discussion

492.	If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will
Answer» If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

Discussion

493.	76.What is the angular momentum of electron in the 7th Bohr orbit.
Answer» 76.What is the angular momentum of electron in the 7th Bohr orbit.

Discussion

494.	Group related points.
Answer» Group related points.

Discussion

495.

Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows. Metal Iron (II) sulphate Cooper (II) sulphate Zinc sulphate Silver nitrate A. No reaction Displacement B. Displacement No reaction C. No reaction No reaction No reaction Displacement D. No reaction No reaction No reaction No reaction Use the Table above to answer the following questions about metals A, B, C and D.(i) Which is the most reactive metal?(ii) What would you observe if B is added to a solution of copper (II) sulphate?(iii) Arrange the metals A, B, C and D in the order of decreasing reactivity.

Answer»

Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows.

Metal	Iron (II) sulphate	Cooper (II) sulphate	Zinc sulphate	Silver nitrate
A.	No reaction	Displacement
B.	Displacement		No reaction
C.	No reaction	No reaction	No reaction	Displacement
D.	No reaction	No reaction	No reaction	No reaction

Use the Table above to answer the following questions about metals A, B, C and D.

(i) Which is the most reactive metal?

(ii) What would you observe if B is added to a solution of copper (II) sulphate?

(iii) Arrange the metals A, B, C and D in the order of decreasing reactivity.

Discussion

496.	What is the major content of lead pencil?
Answer» What is the major content of lead pencil?

Discussion

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

Discussion

498.	What are inflammable substances?
Answer» What are inflammable substances?

Discussion

499.	Explain how food is a fuel. [3 MARKS]
Answer» Explain how food is a fuel. [3 MARKS]

Discussion

500.	Rashmi had a wooden box. One day her sister Rashi in a mischief took Rashmi's box and burned it. What type of combustion is this?
Answer» Rashmi had a wooden box. One day her sister Rashi in a mischief took Rashmi's box and burned it. What type of combustion is this?

Discussion

Explore topic-wise InterviewSolutions in .

Question 16Which of the following in figure do not represent Bohr's model of an atom correctly?(a) (i) and (ii)(b) (ii) and (iii)(c) (ii) and (iv)(d) (i) and (iv)

Why is natural gas called a clean fuel ?

Identify the biodegradable materials from the given options.

What type of mixtures are separated by the technique of crystallisation?

CuSO4 (aq) + H2S (g) → CuS (ppt) + H2SO4(aq) What is the colour of precipitate formed in the above precipitation reaction?

Where do we get to see HCl in free state?

How phitkari helps in water clear

Which is the most stable element of the periodic table?

Two bodies A and B are brought into contact with one another and heat flow from A to B. Which of the following statement is/are true?

What is meant by separation? Answer in detail.

In the rusting of Iron, which of the following cell reactions occurs at the anode?

From amongst the metals sodium, calcium, aluminium, copper and magnesium, name the metal:(a) which reacts with water only on boiling, and(b) another which does not react even with steam.

In cathode ray experiment why does only electron move to protons Why not protons move to electron? Please tell me now because I have test tomorrow?

Which of the following is the main source of carbon monoxide (CO)?

Comment on the following. Periodic changes. Non-periodic changes.

Rolling of chapatti is an example of physical change and baking of chapatti is an example of _______ change.

10.Two walls of thickness d1 and d2 thermal conductivites k1 and k2 are un contact. In the steady state if temp at outer surface are T1 and T2 the temperature at the common wall will be ??

Which metals form oxide and which form Hydroxide?

The Brownian motion is due to:?

Plastic commonly used to make bottles as it is:

alloys are formed by atoms with metallic radii that are within about 15 percent of each other.What does that mean?

How many of the following nitrates of metal M decompose on heating similar to as given below in the scheme?where M: Li, Be, Mg, K, Ca, Sr, Na, Rb, BaMetal nitrateheat−−→Metal oxide+Nitrogen dioxide+oxygen gas

Which of the following can be used to extract the water trapped in aquifers?

Number of P-O-P linkage present in P_4O_6, P_4O_{12}^{-4 } and P_3O_9^{-3} respectively are:

Which of the following is a metal?

How to take out bacisity of an acid simple trick and what is the n factor of NH3

How do the solubility of a solid and a gas gets affected by (a) Increase in temperature ? (b) Increase in pressure ?

In an experiment to measure the pH values of solutions, a student placed strips of universal indicator paper in four beakers containing solutions A, B, C and D. The colour of universal indicator paper in these solutions is as shown below :The solution having lowest pH value is:(1) A(2) B(3) C(4) D

In a first order reaction, the concentration of the reactant is reduced to 12.5% in one hour. When was it half completed?

A mixture of CH4 and C2H4 in Volume ratio x:y has atotal volume of 30ml . On complete combustion it gives 40ml Co2 . If ratio had been y:x instead of x:y what volume of Co2 had been obtained?

Although wood has a very high calorific value, we still discourage its use as a fuel. Explain.​

What type of solvent is partially polar aprotic solvent is??

What term is also same as the number of protons and the number of electrons of a neutral atom?

For the reaction, PbO + H2 → Pb + H2O. Which of the following statements is incorrect?

Write any four metals and non metals. Write it's physical properties, chemical properties and its uses

Question 22 (iv) Fill in the blanks (iv) A fibre similar to wool is ___.

The kinetic energy of a simple harmonic motion when the particle is half way to its end point

Which substance will produce flame on burning?

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

76.What is the angular momentum of electron in the 7th Bohr orbit.

Group related points.

What is the major content of lead pencil?

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

What are inflammable substances?

Explain how food is a fuel. [3 MARKS]

Rashmi had a wooden box. One day her sister Rashi in a mischief took Rashmi's box and burned it. What type of combustion is this?

Although wood has a very high calorific value, we still discourage its use as a fuel. Explain.