10223 + Interview Questions in Chemistry Page 13 InterviewSolution

601.	Explain sieving and give an example.
Answer» Explain sieving and give an example.

Discussion

602.	aqueos solution of urea is 20% by mass of solution.molarity of the solution when density of solution is 1.2g/ml
Answer» aqueos solution of urea is 20% by mass of solution.molarity of the solution when density of solution is 1.2g/ml

Discussion

603.	Which types of stars end their life as a neutron star?
Answer» Which types of stars end their life as a neutron star?

Discussion

604.	1 g atom of nitrogen represent :A. 6.02×10^23 N2 moleculesB 22.4L of N2 at 1 atm and 273 kC. 11.2 L of at 1 atm and 273kD. 14g of nitrogen
Answer» 1 g atom of nitrogen represent : A. 6.02×10^23 N2 molecules B 22.4L of N2 at 1 atm and 273 k C. 11.2 L of at 1 atm and 273k D. 14g of nitrogen

Discussion

605.	60.Find flux through surface 1 , surface 2.( If inner non conducting shell has charge q1 and outer non conducting shell has charge q2 and relative permittivities of mediums are as shown-)
Answer» 60.Find flux through surface 1 , surface 2.( If inner non conducting shell has charge q1 and outer non conducting shell has charge q2 and relative permittivities of mediums are as shown-)

Discussion

606.	Match the following: (i)Can have variable composition of constituent elements(A) Compound(ii) – – – is new substance formed due to reaction of two constituent elements(B) Mixture(iii)Constituent elements can be separated easily(C)Element(iv)Can be separated only by chemical or electrochemical reactions(v)Composition is always fixed(vi)Shows properties of constituent elements The correct pairs are:-
Answer» Match the following: $\begin{matrix} (i) & C a n h a v e v a r i a b l e c o m p o s i t i o n o f c o n s t i t u e n t e l e m e n t s & (A) & C o m p o u n d (i i) & - - - i s n e w s u b s t a n c e f o r m e d d u e t o r e a c t i o n o f t w o c o n s t i t u e n t e l e m e n t s & (B) & M i x t u r e (i i i) & C o n s t i t u e n t e l e m e n t s c a n b e s e p a r a t e d e a s i l y & (C) & E l e m e n t (i v) & C a n b e s e p a r a t e d o n l y b y c h e m i c a l o r e l e c t r o c h e m i c a l r e a c t i o n s (v) & C o m p o s i t i o n i s a l w a y s f i x e d (v i) & S h o w s p r o p e r t i e s o f c o n s t i t u e n t e l e m e n t s \end{matrix}$ The correct pairs are:-

606.

Match the following: (i)Can have variable composition of constituent elements(A) Compound(ii) – – – is new substance formed due to reaction of two constituent elements(B) Mixture(iii)Constituent elements can be separated easily(C)Element(iv)Can be separated only by chemical or electrochemical reactions(v)Composition is always fixed(vi)Shows properties of constituent elements The correct pairs are:-

Answer»

Match the following:

$\begin{matrix} (i) & C a n h a v e v a r i a b l e c o m p o s i t i o n o f c o n s t i t u e n t e l e m e n t s & (A) & C o m p o u n d (i i) & - - - i s n e w s u b s t a n c e f o r m e d d u e t o r e a c t i o n o f t w o c o n s t i t u e n t e l e m e n t s & (B) & M i x t u r e (i i i) & C o n s t i t u e n t e l e m e n t s c a n b e s e p a r a t e d e a s i l y & (C) & E l e m e n t (i v) & C a n b e s e p a r a t e d o n l y b y c h e m i c a l o r e l e c t r o c h e m i c a l r e a c t i o n s (v) & C o m p o s i t i o n i s a l w a y s f i x e d (v i) & S h o w s p r o p e r t i e s o f c o n s t i t u e n t e l e m e n t s \end{matrix}$
The correct pairs are:-

Discussion

607.	What will you take into account while identifying the following?(a) A physical change in a substance.(b) A chemical change in a substance.
Answer» What will you take into account while identifying the following? (a) A physical change in a substance. (b) A chemical change in a substance.

Discussion

608.	Question 16Structural formula of benzene is(a)(b)(c)(d)
Answer» Question 16 Structural formula of benzene is (a) (b) (c) (d)

Discussion

609.	what is the differnce between diamond and graphte
Answer» what is the differnce between diamond and graphte

Discussion

610.	What is fluid
Answer» What is fluid

Discussion

611.	At 25oC, the specific conductance of 0.01 M aqueous solution of acetic acid is 1.63×10−2Sm−1 and the molar conductance at infinite dilution is 390.7×10−4Sm2 mol−1. Calculate the dissociation constant (Ka) of the acid.
Answer» At $25^{o} C$ , the specific conductance of $0.01 M$ aqueous solution of acetic acid is $1.63 \times 10^{- 2} S m^{- 1}$ and the molar conductance at infinite dilution is $390.7 \times 10^{- 4} S m^{2} m o l^{- 1}$ . Calculate the dissociation constant $(K_{a})$ of the acid.

Discussion

612.	Are protons Unstable
Answer» Are protons Unstable

Discussion

613.	The least reactive metal among the following is :
Answer» The least reactive metal among the following is :

Discussion

614.	13.Is there any difference between the aqua regia and royal water and what are the uses of it
Answer» 13.Is there any difference between the aqua regia and royal water and what are the uses of it

Discussion

615.	(i) What is melting?(ii) What do you mean by melting point?(ii) How does melting take place?
Answer» (i) What is melting? (ii) What do you mean by melting point? (ii) How does melting take place?

Discussion

616.	What are Tyndall and Brownian movements?
Answer» What are Tyndall and Brownian movements?

Discussion

617.	the ionisation cons†an t of nitrous acid is 4.5X10^{-4.} calculate ph of.04 sodium nitrate solution and also its degree of hydrolysis
Answer» the ionisation cons†an t of nitrous acid is 4.5X10^{-4.} calculate ph of.04 sodium nitrate solution and also its degree of hydrolysis

Discussion

618.	Matter that cannot be broken down into simpler substances by chemical reactions is called __________________.
Answer» Matter that cannot be broken down into simpler substances by chemical reactions is called __________________.

Discussion

619.	Why was carbon-12 preferred over oxygen-16 to be chosen as the standard reference for measuring atomic masses? [2 MARKS]
Answer» Why was carbon-12 preferred over oxygen-16 to be chosen as the standard reference for measuring atomic masses? [2 MARKS]

Discussion

620.	Atoms always prefer to achieve ___ electrons in their valence shell.
Answer» Atoms always prefer to achieve ___ electrons in their valence shell.

Discussion

621.	LiBr and KCI have radius ratio equal to 0.38 and 0.77 respectively, they have crystal structure like(1) ZnS and NaCl type respectively(2) NaCl and CsCl type respectively(3) CsCl and ZnS type respectively(4) Both have NaCl typ
Answer» LiBr and KCI have radius ratio equal to 0.38 and 0.77 respectively, they have crystal structure like(1) ZnS and NaCl type respectively(2) NaCl and CsCl type respectively(3) CsCl and ZnS type respectively(4) Both have NaCl typ

Discussion

622.	14. a compound MX2 has observed and normal molecular mass 65.5 and 164 respectively .calculate percentage of ionisation of MX2
Answer» 14. a compound MX2 has observed and normal molecular mass 65.5 and 164 respectively .calculate percentage of ionisation of MX2

Discussion

623.	Classic smog is also known as:
Answer» Classic smog is also known as:

Discussion

624.	Which of the following property is generally not shown by metals?(a) Electrical conduction(b) Sonorous in nature(c) Dullness(d) Ductility
Answer» Which of the following property is generally not shown by metals? (a) Electrical conduction (b) Sonorous in nature (c) Dullness (d) Ductility

Discussion

625.	What is covalent compound? How does carbon form covalent bond?
Answer» What is covalent compound? How does carbon form covalent bond?

Discussion

626.	Why is solid carbon dioxide called dry ice?
Answer» Why is solid carbon dioxide called dry ice?

Discussion

627.	Find the number of electrons emitted per second bya 24 W source of monochromatic light of wavelength6600 A, assuming 3% efficiency for photoelectriceffect (take h = 6.6 10-34 Js)(1) 48 x 1019(3) 8 x 1019(2) 48 x 1017(4) 24 x 1017
Answer» Find the number of electrons emitted per second bya 24 W source of monochromatic light of wavelength6600 A, assuming 3% efficiency for photoelectriceffect (take h = 6.6 10-34 Js)(1) 48 x 1019(3) 8 x 1019(2) 48 x 1017(4) 24 x 1017

Discussion

628.	Can you differentiate between solutions of alum, soil, and Milk in water on the basis of stability and transparency? Explain.
Answer» Can you differentiate between solutions of alum, soil, and Milk in water on the basis of stability and transparency? Explain.

Discussion

629.	21.Which of the following aqueous solution has max freezing point? a 0.01 M NaCl b 0.005M C2H5OH c 0.005 M MgI2 d 0.01 M mgso4
Answer» 21.Which of the following aqueous solution has max freezing point? a 0.01 M NaCl b 0.005M C2H5OH c 0.005 M MgI2 d 0.01 M mgso4

Discussion

630.	Gold is found in the free state because:
Answer» Gold is found in the free state because:

Discussion

631.	What is Hydrocarbons? Explain in detail
Answer» What is Hydrocarbons? Explain in detail

Discussion

632.	What would you observe when crystals of copper (II) sulphate and iron (II) sulphate are separately heated in two test tubes ?
Answer» What would you observe when crystals of copper (II) sulphate and iron (II) sulphate are separately heated in two test tubes ?

Discussion

633.	The molecular mass of Na2CO3 is ___.
Answer» The molecular mass of Na₂CO₃ is ___.

Discussion

634.	85.The minimum heat energy required for complete dissociation of n moles of H2 gas at constant temperature T is
Answer» 85.The minimum heat energy required for complete dissociation of n moles of H2 gas at constant temperature T is

Discussion

635.	Question 6(d)Calculate the molar mass of the following substances:(d) Hydrochloric acid, HCl
Answer» Question 6(d) Calculate the molar mass of the following substances: (d) Hydrochloric acid, HCl

Discussion

636.	what is the maximum ciovalency of an atom having atomic number
Answer» what is the maximum ciovalency of an atom having atomic number

Discussion

637.	NH4X+NaNO2⟶NH4NO2+NaX Find out X.
Answer» $N H_{4} X + N a N O_{2} ⟶ N H_{4} N O_{2} + N a X$ Find out X.

637.

NH4X+NaNO2⟶NH4NO2+NaX Find out X.

Answer»

$N H_{4} X + N a N O_{2} ⟶ N H_{4} N O_{2} + N a X$

Find out X.

Discussion

638.	What is Variable Valency? Do elements exhibit variable valencies? Give examples. [3 MARKS]
Answer» What is Variable Valency? Do elements exhibit variable valencies? Give examples. [3 MARKS]

Discussion

639.	Which of the given options has free electrons and can conduct electricity?
Answer» Which of the given options has free electrons and can conduct electricity?

Discussion

640.	Calculatethe molarity of each of the following solutions: (a)30 g of Co(NO3)2.6H2Oin 4.3 L of solution (b)30 mL of 0.5 M H2SO4diluted to 500 mL.
Answer» Calculate the molarity of each of the following solutions: (a) 30 g of Co(NO₃)₂. 6H₂O in 4.3 L of solution (b) 30 mL of 0.5 M H₂SO₄ diluted to 500 mL.

Discussion

641.	Catenation is the ability of an atom to form bonds with other atoms of same elements. Give reasons.
Answer» Catenation is the ability of an atom to form bonds with other atoms of same elements. Give reasons.

Discussion

642.	Fill in the blanks:1. …………………and are sublimatory substances.2. On heating, solids get converted to …………….. and ……………. get converted to gases.3. We usually find matter in …….…., …………., and …………… forms.
Answer» Fill in the blanks: 1. …………………and are sublimatory substances. 2. On heating, solids get converted to …………….. and ……………. get converted to gases. 3. We usually find matter in …….…., …………., and …………… forms.

642.

Fill in the blanks:1. …………………and are sublimatory substances.2. On heating, solids get converted to …………….. and ……………. get converted to gases.3. We usually find matter in …….…., …………., and …………… forms.

Answer»

Fill in the blanks:

1. …………………and are sublimatory substances.

2. On heating, solids get converted to …………….. and ……………. get converted to gases.

3. We usually find matter in …….…., …………., and …………… forms.

Discussion

643.	Convert the following temperature to the Celsius scale.(a) 293 K (b) 470 K
Answer» Convert the following temperature to the Celsius scale. (a) 293 K (b) 470 K

643.

Convert the following temperature to the Celsius scale.(a) 293 K (b) 470 K

Answer»

Convert the following temperature to the Celsius scale.

(a) 293 K (b) 470 K

Discussion

644.	Electrons in hydrogen-like atoms (Z=3) make transitions from the fifth to the fourth orbit and from the fourth to the third orbit. The resulting radiations are incident normally on a metal plate and eject photoelectrons. The stopping potential for the photoelectrons ejected by the shorter wave length is 3.95 V. The work function of the metal =x eV. Then the value of x is _______.Rydberg constant=1.094×107 m−1
Answer» Electrons in hydrogen-like atoms $(Z = 3)$ make transitions from the fifth to the fourth orbit and from the fourth to the third orbit. The resulting radiations are incident normally on a metal plate and eject photoelectrons. The stopping potential for the photoelectrons ejected by the shorter wave length is $3.95 V$ . The work function of the metal $= x eV$ . Then the value of $x$ is _______. $Rydberg constant = 1.094 \times 10^{7} m^{- 1}$

Discussion

645.	We know, in a solution the substance present in the smaller quantity is called the solute and the substance present in larger amount is called solvent. But what if both the constituents of the solution are in equal amount ? Suppose we have a liquid in liquid solution in which both the constituents are in equal amount then which one would be solute and which one would be the solvent in that particular solution?
Answer» We know, in a solution the substance present in the smaller quantity is called the solute and the substance present in larger amount is called solvent. But what if both the constituents of the solution are in equal amount ? Suppose we have a liquid in liquid solution in which both the constituents are in equal amount then which one would be solute and which one would be the solvent in that particular solution?

Discussion

646.	The reaction in which heat is liberated is called _____________ reaction.
Answer» The reaction in which heat is liberated is called _____________ reaction.

Discussion

647.	71 : What is three electron bond??
Answer» 71 : What is three electron bond??

Discussion

648.	What is the mass percentage of hydrogen in the H2O molecule?
Answer» What is the mass percentage of hydrogen in the H₂O molecule?

Discussion

649.	Crystallisation is better than simple evaporation because:
Answer» Crystallisation is better than simple evaporation because:

Discussion

650.	The number of electrons in 1.6 g of CH4 is approximately
Answer» The number of electrons in 1.6 g of CH4 is approximately

Discussion

Explore topic-wise InterviewSolutions in .

Explain sieving and give an example.

aqueos solution of urea is 20% by mass of solution.molarity of the solution when density of solution is 1.2g/ml

Which types of stars end their life as a neutron star?

1 g atom of nitrogen represent :A. 6.02×10^23 N2 moleculesB 22.4L of N2 at 1 atm and 273 kC. 11.2 L of at 1 atm and 273kD. 14g of nitrogen

60.Find flux through surface 1 , surface 2.( If inner non conducting shell has charge q1 and outer non conducting shell has charge q2 and relative permittivities of mediums are as shown-)

What will you take into account while identifying the following?(a) A physical change in a substance.(b) A chemical change in a substance.

Question 16Structural formula of benzene is(a)(b)(c)(d)

what is the differnce between diamond and graphte

What is fluid

At 25oC, the specific conductance of 0.01 M aqueous solution of acetic acid is 1.63×10−2Sm−1 and the molar conductance at infinite dilution is 390.7×10−4Sm2 mol−1. Calculate the dissociation constant (Ka) of the acid.

Are protons Unstable

The least reactive metal among the following is :

13.Is there any difference between the aqua regia and royal water and what are the uses of it

(i) What is melting?(ii) What do you mean by melting point?(ii) How does melting take place?

What are Tyndall and Brownian movements?

the ionisation cons†an t of nitrous acid is 4.5X10^{-4.} calculate ph of.04 sodium nitrate solution and also its degree of hydrolysis

Matter that cannot be broken down into simpler substances by chemical reactions is called __________________.

Why was carbon-12 preferred over oxygen-16 to be chosen as the standard reference for measuring atomic masses? [2 MARKS]

Atoms always prefer to achieve ___ electrons in their valence shell.

LiBr and KCI have radius ratio equal to 0.38 and 0.77 respectively, they have crystal structure like(1) ZnS and NaCl type respectively(2) NaCl and CsCl type respectively(3) CsCl and ZnS type respectively(4) Both have NaCl typ

14. a compound MX2 has observed and normal molecular mass 65.5 and 164 respectively .calculate percentage of ionisation of MX2

Classic smog is also known as:

Which of the following property is generally not shown by metals?(a) Electrical conduction(b) Sonorous in nature(c) Dullness(d) Ductility

What is covalent compound? How does carbon form covalent bond?

Why is solid carbon dioxide called dry ice?

Find the number of electrons emitted per second bya 24 W source of monochromatic light of wavelength6600 A, assuming 3% efficiency for photoelectriceffect (take h = 6.6 10-34 Js)(1) 48 x 1019(3) 8 x 1019(2) 48 x 1017(4) 24 x 1017

Can you differentiate between solutions of alum, soil, and Milk in water on the basis of stability and transparency? Explain.

21.Which of the following aqueous solution has max freezing point? a 0.01 M NaCl b 0.005M C2H5OH c 0.005 M MgI2 d 0.01 M mgso4

Gold is found in the free state because:

What is Hydrocarbons? Explain in detail

What would you observe when crystals of copper (II) sulphate and iron (II) sulphate are separately heated in two test tubes ?

The molecular mass of Na2CO3 is ___.

85.The minimum heat energy required for complete dissociation of n moles of H2 gas at constant temperature T is

Question 6(d)Calculate the molar mass of the following substances:(d) Hydrochloric acid, HCl

what is the maximum ciovalency of an atom having atomic number

NH4X+NaNO2⟶NH4NO2+NaX Find out X.

What is Variable Valency? Do elements exhibit variable valencies? Give examples. [3 MARKS]

Which of the given options has free electrons and can conduct electricity?

Calculatethe molarity of each of the following solutions: (a)30 g of Co(NO3)2.6H2Oin 4.3 L of solution (b)30 mL of 0.5 M H2SO4diluted to 500 mL.

Catenation is the ability of an atom to form bonds with other atoms of same elements. Give reasons.

Fill in the blanks:1. …………………and are sublimatory substances.2. On heating, solids get converted to …………….. and ……………. get converted to gases.3. We usually find matter in …….…., …………., and …………… forms.

Convert the following temperature to the Celsius scale.(a) 293 K (b) 470 K

The reaction in which heat is liberated is called _____________ reaction.

71 : What is three electron bond??

What is the mass percentage of hydrogen in the H2O molecule?

Crystallisation is better than simple evaporation because:

The number of electrons in 1.6 g of CH4 is approximately