46295 + Interview Questions in Chemistry

1.	Is boron a metal or non metal?
Answer» Is boron a metal or non metal?

Discussion

2.	Calculate the enthalpy change for the processCCl4(g) → C(g) + 4Cl(g)and calculate bond enthalpy of C–Cl in CCl4(g).ΔvapHθ (CCl4) = 30.5 kJ mol–1.ΔfHθ (CCl4) = –135.5 kJ mol–1.ΔaHθ (C) = 715.0 kJ mol–1, where ΔaHθ is enthalpy of atomisationΔaHθ (Cl2) = 242 kJ mol–1
Answer» Calculate the enthalpy change for the process CCl₄₍_g₎ → C₍_g₎ + 4Cl₍_g₎ and calculate bond enthalpy of C–Cl in CCl₄₍_g_). Δ_vapH^θ (CCl₄) = 30.5 kJ mol^–1. Δ_fH^θ (CCl₄) = –135.5 kJ mol^–1. Δ_aH^θ (C) = 715.0 kJ mol^–1, where Δ_aH^θ is enthalpy of atomisation Δ_aH^θ (Cl₂) = 242 kJ mol^–1

2.

Calculate the enthalpy change for the processCCl4(g) → C(g) + 4Cl(g)and calculate bond enthalpy of C–Cl in CCl4(g).ΔvapHθ (CCl4) = 30.5 kJ mol–1.ΔfHθ (CCl4) = –135.5 kJ mol–1.ΔaHθ (C) = 715.0 kJ mol–1, where ΔaHθ is enthalpy of atomisationΔaHθ (Cl2) = 242 kJ mol–1

Answer»

Calculate the enthalpy change for the process

CCl₄₍_g₎ → C₍_g₎ + 4Cl₍_g₎

and calculate bond enthalpy of C–Cl in CCl₄₍_g_).

Δ_vapH^θ (CCl₄) = 30.5 kJ mol^–1.

Δ_fH^θ (CCl₄) = –135.5 kJ mol^–1.

Δ_aH^θ (C) = 715.0 kJ mol^–1, where Δ_aH^θ is enthalpy of atomisation

Δ_aH^θ (Cl₂) = 242 kJ mol^–1

Discussion

3.	The reaction of cyanamide, NH2CN(s) with oxygen was run in a bomb calorimeter and ΔU was found to be −742.24kJmol−1.The magnitude of ΔH298 for the reactionNH2CN(s)+32(g)→N2(g)+CO2(g)+H2O(l) is ______ kJ. (Rounded off to the nearest integer)[Assume ideal gases and R=8.314Jmol−1K−1]
Answer» The reaction of cyanamide, $N H_{2} C N (s)$ with oxygen was run in a bomb calorimeter and $Δ U$ was found to be $- 742.24 k J m o l^{- 1}$ .The magnitude of $Δ H_{298}$ for the reaction $N H_{2} C N (s) + \frac{3}{2} (g) \to N_{2} (g) + C O_{2} (g) + H_{2} O (l)$ is ______ kJ. (Rounded off to the nearest integer) [Assume ideal gases and $R = 8.314 J m o l^{- 1} K^{- 1}$ ]

Discussion

4.	A gaseous mixture of H2 and CO2 gas contains 66 mass % of CO2 . The vapour density of the mixture is
Answer» A gaseous mixture of $H_{2}$ and $C O_{2}$ gas contains $66$ mass $%$ of $C O_{2}$ . The vapour density of the mixture is

Discussion

5.	Chemisorption is exothermic so according to le chatelier's principle it should decrease with rise in temperature but it increases with temperature initially. Why?
Answer» Chemisorption is exothermic so according to le chatelier's principle it should decrease with rise in temperature but it increases with temperature initially. Why?

Discussion

6.	You are an alchemist who is trying to remove hard lead impurity from Crude silver. You can only use thermal refining by using a blast of air. What would you use?
Answer» You are an alchemist who is trying to remove hard lead impurity from Crude silver. You can only use thermal refining by using a blast of air. What would you use?

Discussion

7.	Identify the statement that is not correct as far as structure of diborane is concerned.
Answer» Identify the statement that is not correct as far as structure of diborane is concerned.

Discussion

8.	o-xylene on ozonolysis gives how many produc
Answer» o-xylene on ozonolysis gives how many produc

Discussion

9.	Resistance of a 0.1 N KCN solution is 245 Ω. If the electrodes in the cell are 5 cm apart and area having 100 cm2 each, the molar conductance of the solution will be:
Answer» Resistance of a $0.1 N K C N$ solution is $245 Ω$ . If the electrodes in the cell are $5 c m$ apart and area having $100 c m^{2}$ each, the molar conductance of the solution will be:

Discussion

10.	why boron and aluminium on reaction with water form oxides not h3b03 and al(oh)3 ??
Answer» why boron and aluminium on reaction with water form oxides not h3b03 and al(oh)3 ??

Discussion

11.	The dipole moment of NaCl molecule is 8.4 D and its bond length is 2.1 ∘A. The percentage ionic character in this molecule will be:
Answer» The dipole moment of $N a C l$ molecule is $8.4 D$ and its bond length is $2.1 \circ A$ . The percentage ionic character in this molecule will be:

Discussion

12.	1. CH_2=CH_{2 }\xrightarrow{Br_2}(A) \xrightarrow[△]{alcoholic KOH}(B) \xrightarrow{NaNH_2}(C) \xrightarrow[△]{Cu tube}(D) 2. CH_3-CHBr-CH_2-CH_3\xrightarrow{alcoholic KOH}(E) Find A, B , C, D, E
Answer» 1. CH_2=CH_{2 }\xrightarrow{Br_2}(A) \xrightarrow[△]{alcoholic KOH}(B) \xrightarrow{NaNH_2}(C) \xrightarrow[△]{Cu tube}(D) 2. CH_3-CHBr-CH_2-CH_3\xrightarrow{alcoholic KOH}(E) Find A, B , C, D, E

Discussion

13.	50. A hydrocarbon contains 10.5 g carbon and 1 g hydrogen. Its 2.81 g has 1L volume at 1 atm and127^° C, hydrocarbon is
Answer» 50. A hydrocarbon contains 10.5 g carbon and 1 g hydrogen. Its 2.81 g has 1L volume at 1 atm and127^° C, hydrocarbon is

Discussion

14.	13.A sample of a radioactive substance undergoes 80% decomposition in 345minutes.Its half life is 1)ln2/ln5345min 2)ln5/ln2345min 3)ln5/ln4345min 4)ln4/ln5345min
Answer» 13.A sample of a radioactive substance undergoes 80% decomposition in 345minutes.Its half life is 1)ln2/ln5345min 2)ln5/ln2345min 3)ln5/ln4345min 4)ln4/ln5345min

Discussion

15.	Highest viscosity is exhibited by :
Answer» Highest viscosity is exhibited by :

Discussion

16.	For a sparingly soluble salt ApBq, the relationship its solubility product (Ksp) with its solubility (S) is
Answer» For a sparingly soluble salt $A_{p} B_{q},$ the relationship its solubility product $(K_{s p})$ with its solubility (S) is

Discussion

17.	Considerthe reactions:(a) 6 CO2(g)+ 6H2O(l)→ C6H12O6(aq)+ 6O2(g)(b) O3(g)+ H2O2(l)→ H2O(l)+ 2O2(g)Whyit is more appropriate to write these reactions as:(a) 6CO2(g)+ 12H2O(l)→ C6H12O6(aq)+ 6H2O(l)+ 6O2(g)(b) O3(g)+ H2O2(l) → H2O(l)+ O2(g)+ O2(g)Alsosuggest a technique to investigate the path of the above (a) and (b)redoxreactions.
Answer» Consider the reactions: (a) 6 CO₂(g) + 6H₂O(l) → C₆ H₁₂ O₆(aq) + 6O₂(g) (b) O₃(g) + H₂O₂(l) → H₂O(l) + 2O₂(g) Why it is more appropriate to write these reactions as: (a) 6CO₂(g) + 12H₂O(l) → C₆ H₁₂ O₆(aq) + 6H₂O(l) + 6O₂(g) (b) O₃(g) + H₂O₂ (l) → H₂O(l) + O₂(g) + O₂(g) Also suggest a technique to investigate the path of the above (a) and (b) redox reactions.

17.

Considerthe reactions:(a) 6 CO2(g)+ 6H2O(l)→ C6H12O6(aq)+ 6O2(g)(b) O3(g)+ H2O2(l)→ H2O(l)+ 2O2(g)Whyit is more appropriate to write these reactions as:(a) 6CO2(g)+ 12H2O(l)→ C6H12O6(aq)+ 6H2O(l)+ 6O2(g)(b) O3(g)+ H2O2(l) → H2O(l)+ O2(g)+ O2(g)Alsosuggest a technique to investigate the path of the above (a) and (b)redoxreactions.

Answer»

Consider
the reactions:

(a)
6 CO₂(g)
+ 6H₂O(l)
→ C₆
H₁₂
O₆(aq)
+ 6O₂(g)

(b)
O₃(g)
+ H₂O₂(l)
→ H₂O(l)
+ 2O₂(g)

Why
it is more appropriate to write these reactions as:

(a)
6CO₂(g)
+ 12H₂O(l)
→ C₆
H₁₂
O₆(aq)
+ 6H₂O(l)
+ 6O₂(g)

(b)
O₃(g)
+ H₂O₂
(l) → H₂O(l)
+ O₂(g)
+ O₂(g)

Also
suggest a technique to investigate the path of the above (a) and (b)
redox

reactions.

Discussion

18.	[CBSE PMT 1996; MP PET 2002; MP PMT 2000]
Answer» [CBSE PMT 1996; MP PET 2002; MP PMT 2000]

18.

[CBSE PMT 1996; MP PET 2002; MP PMT 2000]

Answer»

[CBSE PMT 1996; MP PET 2002; MP PMT 2000]

Discussion

19.	The thiol group is present in:
Answer» The thiol group is present in:

Discussion

20.	Conjugate base of NH3 is:
Answer» Conjugate base of $N H_{3}$ is:

Discussion

21.	The freezing point of equimolal aqueous solutions will be the highest for:
Answer» The freezing point of equimolal aqueous solutions will be the highest for:

Discussion

22.	which of the following does not affect rate of reaction ? a)amount of reac†an t taken b)physical state of reaction c) heat of reaction d) size of vesse
Answer» which of the following does not affect rate of reaction ? a)amount of reac†an t taken b)physical state of reaction c) heat of reaction d) size of vesse

Discussion

23.	What will be the corresponding products when the following compounds are reacted with Na in liquid NH3 ?i) Benzeneii) Methoxybenzeneiii) Nitrobenzene
Answer» What will be the corresponding products when the following compounds are reacted with Na in liquid NH3 ? i) Benzene ii) Methoxybenzene iii) Nitrobenzene

Discussion

24.	Prove Graham's law of diffusion
Answer» Prove Graham's law of diffusion

Discussion

25.	In the reaction CH3CH3NH2+CH3MgBr→X, .The product is :
Answer» In the reaction $C H_{3} C H_{3} N H_{2} + C H_{3} M g B r \to X,$ .The product is :

Discussion

26.	Consider the following reaction Product P of the reaction is:
Answer» Consider the following reaction Product P of the reaction is:

Discussion

27.	Silver (Atomic weight = 108 g/mol) has a density of 5.5 g/cm3. The number of silver atoms on a surface of area 10−12 m2 can be expressed in scientific notation as 8.3×10x. The value of x is: ( Take: NA=6×1023,π=3)
Answer» Silver (Atomic weight = 108 $g/mol$ ) has a density of 5.5 ${g/cm}^{3}$ . The number of silver atoms on a surface of area $10^{- 12} m^{2}$ can be expressed in scientific notation as $8.3 \times 10^{x}$ . The value of x is: ( Take: $N_{A} = 6 \times 10^{23}, π = 3)$

Discussion

28.	Out of C andCO1 which is a better reducing agent at 673 K?
Answer» Out of C and $C O_{1}$ which is a better reducing agent at 673 K?

Discussion

29.	Atomic number of Cr and Fe are 24 and 26 respectively. Which of the following is paramagnetic with the spin of electron?
Answer» Atomic number of Cr and Fe are 24 and 26 respectively. Which of the following is paramagnetic with the spin of electron?

Discussion

30.	Aniline when diazotized in cold and then treated with dimethyl aniline gives a coloured product. Its structure would be.
Answer» Aniline when diazotized in cold and then treated with dimethyl aniline gives a coloured product. Its structure would be.

Discussion

31.	Consider a redox reaction : x Na2HAsO3+y NaBrO3+z HCl→NaBr+H3AsO4+NaCl where x,y,z are the stoichiometric coefficients of Na2HAsO3,NaBrO3,HCl respectively. The value of x+y+z in the above balanced redox reaction is :
Answer» Consider a redox reaction : $x N a_{2} H A s O_{3} + y N a B r O_{3} + z H C l \to N a B r + H_{3} A s O_{4} + N a C l$ where $x, y, z$ are the stoichiometric coefficients of $N a_{2} H A s O_{3}, N a B r O_{3}, H C l$ respectively. The value of $x + y + z$ in the above balanced redox reaction is :

Discussion

32.	Why is diazotization reaction nucleophilic substitution reaction
Answer» Why is diazotization reaction nucleophilic substitution reaction

Discussion

33.	Which of the following halides is stable to hydrolysis?
Answer» Which of the following halides is stable to hydrolysis?

Discussion

34.	In a fuel cell, H2 and O2 react to produce electricity. In the process H2 gas is oxidised at the anode and O2 is reduced at the cathode. If 67.2 L of H2 at STP reacts in 15 min, what is the average currecnt produced? If the entire current is used for electro deposition of Cu from Cu2+, how many grams of Cu are deposited?
Answer» In a fuel cell, $H_{2}$ and $O_{2}$ react to produce electricity. In the process $H_{2}$ gas is oxidised at the anode and $O_{2}$ is reduced at the cathode. If $67.2 L$ of $H_{2}$ at $S T P$ reacts in $15 m i n$ , what is the average currecnt produced? If the entire current is used for electro deposition of $C u$ from $C u^{2 +}$ , how many grams of $C u$ are deposited?

Discussion

35.	TheQvalueof a nuclear reaction A+b→ C+disdefined by Q=[ mA+mb−mC−md]c2wherethe masses refer to the respective nuclei. Determine from the givendata the Q-valueof the following reactions and state whether the reactions areexothermic or endothermic.(i)(ii)Atomicmasses are given to be
Answer» The Q value of a nuclear reaction A + b → C + d is defined by Q = [ m_A+ m_b− m_C− m_d]c²where the masses refer to the respective nuclei. Determine from the given data the Q-value of the following reactions and state whether the reactions are exothermic or endothermic. (i) (ii) Atomic masses are given to be

35.

TheQvalueof a nuclear reaction A+b→ C+disdefined by Q=[ mA+mb−mC−md]c2wherethe masses refer to the respective nuclei. Determine from the givendata the Q-valueof the following reactions and state whether the reactions areexothermic or endothermic.(i)(ii)Atomicmasses are given to be

Answer»

The
Q
value
of a nuclear reaction A
+
b
→ C
+
d
is
defined by

Q
=
[ m_A+
m_b−
m_C−
m_d]c²where
the masses refer to the respective nuclei. Determine from the given
data the Q-value
of the following reactions and state whether the reactions are
exothermic or endothermic.

(i)

(ii)

Atomic
masses are given to be

Discussion

36.	23. The osmotic pressure of 5% (mass/volume ) solution of cane sugar at 50 Celcius is ?
Answer» 23. The osmotic pressure of 5% (mass/volume ) solution of cane sugar at 50 Celcius is ?

Discussion

37.	Compare inductive effect of carbon carbon single, double and triple Bond
Answer» Compare inductive effect of carbon carbon single, double and triple Bond

Discussion

38.	Major product obtained in the given reaction is: CH3−CH=CH2B2H6/THF−−−−−−−−−−→(ii) H2O2/OH−
Answer» Major product obtained in the given reaction is: $C H_{3} - C H = C H_{2} B_{2} H_{6} / T H F - --------- \to (i i) H_{2} O_{2} / O H^{-}$

Discussion

39.	32. invalid name of given compound is CH3-ch=ch-cn 1 allyl cyanide 2 crotononitrile 3 but-2-enenitrile 4 none of these
Answer» 32. invalid name of given compound is CH3-ch=ch-cn 1 allyl cyanide 2 crotononitrile 3 but-2-enenitrile 4 none of these

Discussion

40.	An orange solid on heating gives a colourless gas where as a green solid can be reduced to metal by aluminium powder. The orange and green solids respectively are:
Answer» An orange solid on heating gives a colourless gas where as a green solid can be reduced to metal by aluminium powder. The orange and green solids respectively are:

Discussion

41.	Breathalyzers detect alcohol via:Cr2O72- + C2H5OH → Cr3+ + CH3CHO
Answer» Breathalyzers detect alcohol via: Cr₂O₇^2- + C₂H₅OH → Cr³⁺ + CH₃CHO

41.

Breathalyzers detect alcohol via:Cr2O72- + C2H5OH → Cr3+ + CH3CHO

Answer»

Breathalyzers detect alcohol via:

Cr₂O₇^2- + C₂H₅OH → Cr³⁺ + CH₃CHO

Discussion

42.	Which one travels faster : Light or Quantum Information.Prove with the help of Quantum Mechanics, Quantum Field Theory, Quantum Entanglement, Special Relativity and General Relativity.
Answer» Which one travels faster : Light or Quantum Information. Prove with the help of Quantum Mechanics, Quantum Field Theory, Quantum Entanglement, Special Relativity and General Relativity.

Discussion

43.	29. A compound formed by element X, Y,Z has a cubic structure in which X atom are at the corner of the cube and also at alternate face centre Y atom are present at the body center and Z atom are present at the alternate edge centre then the molecular formula of the compound is
Answer» 29. A compound formed by element X, Y,Z has a cubic structure in which X atom are at the corner of the cube and also at alternate face centre Y atom are present at the body center and Z atom are present at the alternate edge centre then the molecular formula of the compound is

Discussion

44.	32. Enol content of Cyclobutane 1,3-dione and Cyclobutane 1,2,3-trione is: 1) B greater than A 2) A greater than B 3) A equals to B 4) A greater than B
Answer» 32. Enol content of Cyclobutane 1,3-dione and Cyclobutane 1,2,3-trione is: 1) B greater than A 2) A greater than B 3) A equals to B 4) A greater than B

Discussion

45.	2-chlorobutane is heated with alcoholic NaOH, the product formed in larger amount is
Answer» 2-chlorobutane is heated with alcoholic NaOH, the product formed in larger amount is

Discussion

46.	What is the correct unit of equilibrium constant (Kc) for the below reaction?C(s)+12O2(g)⇌CO(g)
Answer» What is the correct unit of equilibrium constant $(K_{c})$ for the below reaction? $C (s) + \frac{1}{2} O_{2} (g) ⇌ C O (g)$

Discussion

47.	Two substance A(t12=10 min) and B(t12=20 min)follow 1st order kinetics in such a way that [A]i=8[B]i. Time when[B]=2[A]in min is :
Answer» Two substance $A (t_{\frac{1}{2}} = 10 min) and B (t_{\frac{1}{2}} = 20 min)$ follow $1^{st}$ order kinetics in such a way that $[A]_{i} = 8 [B]_{i} . Time when [B] = 2 [A]$ in min is :

Discussion

48.	In a face-centered cubic lattice, a unit cell is shared equally by how many unit cells? (1)2 (2) 4 (3)6 (4) 8
Answer» In a face-centered cubic lattice, a unit cell is shared equally by how many unit cells? (1)2 (2) 4 (3)6 (4) 8

Discussion

49.	Why pure iron is not used for making permanent magnets
Answer» Why pure iron is not used for making permanent magnets

Discussion

50.	If the velocity of hydrogen molecule is 5*10000 cm/sec , then its broglie wavelenghth is
Answer» If the velocity of hydrogen molecule is 5*10000 cm/sec , then its broglie wavelenghth is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Is boron a metal or non metal?

Calculate the enthalpy change for the processCCl4(g) → C(g) + 4Cl(g)and calculate bond enthalpy of C–Cl in CCl4(g).ΔvapHθ (CCl4) = 30.5 kJ mol–1.ΔfHθ (CCl4) = –135.5 kJ mol–1.ΔaHθ (C) = 715.0 kJ mol–1, where ΔaHθ is enthalpy of atomisationΔaHθ (Cl2) = 242 kJ mol–1

The reaction of cyanamide, NH2CN(s) with oxygen was run in a bomb calorimeter and ΔU was found to be −742.24kJmol−1.The magnitude of ΔH298 for the reactionNH2CN(s)+32(g)→N2(g)+CO2(g)+H2O(l) is ______ kJ. (Rounded off to the nearest integer)[Assume ideal gases and R=8.314Jmol−1K−1]

A gaseous mixture of H2 and CO2 gas contains 66 mass % of CO2 . The vapour density of the mixture is

Chemisorption is exothermic so according to le chatelier's principle it should decrease with rise in temperature but it increases with temperature initially. Why?

You are an alchemist who is trying to remove hard lead impurity from Crude silver. You can only use thermal refining by using a blast of air. What would you use?

Identify the statement that is not correct as far as structure of diborane is concerned.

o-xylene on ozonolysis gives how many produc

Resistance of a 0.1 N KCN solution is 245 Ω. If the electrodes in the cell are 5 cm apart and area having 100 cm2 each, the molar conductance of the solution will be:

why boron and aluminium on reaction with water form oxides not h3b03 and al(oh)3 ??

The dipole moment of NaCl molecule is 8.4 D and its bond length is 2.1 ∘A. The percentage ionic character in this molecule will be:

1. CH_2=CH_{2 }\xrightarrow{Br_2}(A) \xrightarrow[△]{alcoholic KOH}(B) \xrightarrow{NaNH_2}(C) \xrightarrow[△]{Cu tube}(D) 2. CH_3-CHBr-CH_2-CH_3\xrightarrow{alcoholic KOH}(E) Find A, B , C, D, E

50. A hydrocarbon contains 10.5 g carbon and 1 g hydrogen. Its 2.81 g has 1L volume at 1 atm and127^° C, hydrocarbon is

13.A sample of a radioactive substance undergoes 80% decomposition in 345minutes.Its half life is 1)ln2/ln5*345min 2)ln5/ln2*345min 3)ln5/ln4*345min 4)ln4/ln5*345min

Highest viscosity is exhibited by :

For a sparingly soluble salt ApBq, the relationship its solubility product (Ksp) with its solubility (S) is

[CBSE PMT 1996; MP PET 2002; MP PMT 2000]

The thiol group is present in:

Conjugate base of NH3 is:

The freezing point of equimolal aqueous solutions will be the highest for:

which of the following does not affect rate of reaction ? a)amount of reac†an t taken b)physical state of reaction c) heat of reaction d) size of vesse

What will be the corresponding products when the following compounds are reacted with Na in liquid NH3 ?i) Benzeneii) Methoxybenzeneiii) Nitrobenzene

Prove Graham's law of diffusion

In the reaction CH3CH3NH2+CH3MgBr→X, .The product is :

Consider the following reaction Product P of the reaction is:

Silver (Atomic weight = 108 g/mol) has a density of 5.5 g/cm3. The number of silver atoms on a surface of area 10−12 m2 can be expressed in scientific notation as 8.3×10x. The value of x is: ( Take: NA=6×1023,π=3)

Out of C andCO1 which is a better reducing agent at 673 K?

Atomic number of Cr and Fe are 24 and 26 respectively. Which of the following is paramagnetic with the spin of electron?

Aniline when diazotized in cold and then treated with dimethyl aniline gives a coloured product. Its structure would be.

Consider a redox reaction : x Na2HAsO3+y NaBrO3+z HCl→NaBr+H3AsO4+NaCl where x,y,z are the stoichiometric coefficients of Na2HAsO3,NaBrO3,HCl respectively. The value of x+y+z in the above balanced redox reaction is :

Why is diazotization reaction nucleophilic substitution reaction

Which of the following halides is stable to hydrolysis?

TheQvalueof a nuclear reaction A+b→ C+disdefined by Q=[ mA+mb−mC−md]c2wherethe masses refer to the respective nuclei. Determine from the givendata the Q-valueof the following reactions and state whether the reactions areexothermic or endothermic.(i)(ii)Atomicmasses are given to be

23. The osmotic pressure of 5% (mass/volume ) solution of cane sugar at 50 Celcius is ?

Compare inductive effect of carbon carbon single, double and triple Bond

Major product obtained in the given reaction is: CH3−CH=CH2B2H6/THF−−−−−−−−−−→(ii) H2O2/OH−

32. invalid name of given compound is CH3-ch=ch-cn 1 allyl cyanide 2 crotononitrile 3 but-2-enenitrile 4 none of these

An orange solid on heating gives a colourless gas where as a green solid can be reduced to metal by aluminium powder. The orange and green solids respectively are:

Breathalyzers detect alcohol via:Cr2O72- + C2H5OH → Cr3+ + CH3CHO

Which one travels faster : Light or Quantum Information.Prove with the help of Quantum Mechanics, Quantum Field Theory, Quantum Entanglement, Special Relativity and General Relativity.

29. A compound formed by element X, Y,Z has a cubic structure in which X atom are at the corner of the cube and also at alternate face centre Y atom are present at the body center and Z atom are present at the alternate edge centre then the molecular formula of the compound is

32. Enol content of Cyclobutane 1,3-dione and Cyclobutane 1,2,3-trione is: 1) B greater than A 2) A greater than B 3) A equals to B 4) A greater than B

2-chlorobutane is heated with alcoholic NaOH, the product formed in larger amount is

What is the correct unit of equilibrium constant (Kc) for the below reaction?C(s)+12O2(g)⇌CO(g)

Two substance A(t12=10 min) and B(t12=20 min)follow 1st order kinetics in such a way that [A]i=8[B]i. Time when[B]=2[A]in min is :

In a face-centered cubic lattice, a unit cell is shared equally by how many unit cells? (1)2 (2) 4 (3)6 (4) 8

Why pure iron is not used for making permanent magnets

If the velocity of hydrogen molecule is 5*10000 cm/sec , then its broglie wavelenghth is

13.A sample of a radioactive substance undergoes 80% decomposition in 345minutes.Its half life is 1)ln2/ln5345min 2)ln5/ln2345min 3)ln5/ln4345min 4)ln4/ln5345min