15280 + Interview Questions in Chemistry Page 129 InterviewSolution

6401.	Why Li is weakest reducing agent in Free state but strongest reducing agent in solution?
Answer» Why Li is weakest reducing agent in Free state but strongest reducing agent in solution?

Discussion

6402.	30. Among following how to find electron deficient compound? Options: BCl3, CCl4,PCl5,BeCl2
Answer» 30. Among following how to find electron deficient compound? Options: BCl3, CCl4,PCl5,BeCl2

Discussion

6403.	26. Calculate the mole fraction of NaCl present in 2molal aqueous solution of NaCl
Answer» 26. Calculate the mole fraction of NaCl present in 2molal aqueous solution of NaCl

Discussion

6404.	The solution of copper sulphate is.
Answer» The solution of copper sulphate is.

Discussion

6405.	If the degree of dissociation is given then how to take the values at equilibriumQ. 2HI =H2+I2 The degree of dissociation is a. Calculate expression for equilibrium constant Kc of the reaction.
Answer» If the degree of dissociation is given then how to take the values at equilibrium Q. 2HI =H2+I2 The degree of dissociation is a. Calculate expression for equilibrium constant Kc of the reaction.

Discussion

6406.	The total volume of mixture of 2 g of helium and 7 g of nitrogen under S.T.P. conditions is
Answer» The total volume of mixture of 2 g of helium and 7 g of nitrogen under S.T.P. conditions is

Discussion

6407.	What is the expression of pH?
Answer» What is the expression of pH?

Discussion

6408.	Calculate the concentration of H2, I2 and HI at equilibrium if 0.0400 mole of HI is placed in a 1.00L flask at 4300C. Kc for the reaction: H2(g)+ I2(g)⇌ 2HI(g) is 54.5 at this temperature [H2] , [I2] , [HI] a) 0.0200, 0.0200 ,0.0200b) 0.00427 ,0.00427 ,0.0315c) 0.0315 ,0.0315, 0.00850d) 0.00478, 0.00478, 0.0352
Answer» Calculate the concentration of H2, I2 and HI at equilibrium if 0.0400 mole of HI is placed in a 1.00L flask at 4300C. Kc for the reaction: H2(g)+ I2(g)⇌ 2HI(g) is 54.5 at this temperature [H2] , [I2] , [HI] a) 0.0200, 0.0200 ,0.0200 b) 0.00427 ,0.00427 ,0.0315 c) 0.0315 ,0.0315, 0.00850 d) 0.00478, 0.00478, 0.0352

Discussion

6409.	2,3-dimethyl butan-2-ol H3PO4−−−−→ X
Answer» 2,3-dimethyl butan-2-ol $H_{3} P O_{4} - --- \to$ X

Discussion

6410.	The number of bonding e- pairs in N2 on the basis of molecular orbital theory is? 1. 3 2. 2 3. 5 4. 4 And how??
Answer» The number of bonding e- pairs in N2 on the basis of molecular orbital theory is? 1. 3 2. 2 3. 5 4. 4 And how??

Discussion

6411.	Which of the following gas is a colourless gas which also bleaches?
Answer» Which of the following gas is a colourless gas which also bleaches?

Discussion

6412.	How magnetic quantum no explained zeeman and stark effects?
Answer» How magnetic quantum no explained zeeman and stark effects?

Discussion

6413.	The following questions refer to the Periodic Table.(a) (i) Name the first and last element in period 2.(ii) What happens to the atomic size of elements moving from top to bottom of a group?(iii) Which of the elements has the greatest electron affinity among the halogens?(iv) What is the common feature of the electronic configurations of the elements in group 7?(b) Supply the missing word from those in the brackets:(i) If an element has a low ionization energy then it is likely to be _________ (metallic/non-metallic).(ii) If an element has seven electrons in its outermost shell then it is likely to have the ________ (largest/smallest) atomic size among all the elements in the same period.(c) (i) The metals of Group 2 from top to bottom are: Be, Mg, Ca, Sr, Ba. Which of these metals will form ions most readily and why?(ii) What property of an element is measured by electronegativity?
Answer» The following questions refer to the Periodic Table. (a) (i) Name the first and last element in period 2. (ii) What happens to the atomic size of elements moving from top to bottom of a group? (iii) Which of the elements has the greatest electron affinity among the halogens? (iv) What is the common feature of the electronic configurations of the elements in group 7? (b) Supply the missing word from those in the brackets: (i) If an element has a low ionization energy then it is likely to be _________ (metallic/non-metallic). (ii) If an element has seven electrons in its outermost shell then it is likely to have the ________ (largest/smallest) atomic size among all the elements in the same period. (c) (i) The metals of Group 2 from top to bottom are: Be, Mg, Ca, Sr, Ba. Which of these metals will form ions most readily and why? (ii) What property of an element is measured by electronegativity?

Discussion

6414.	Density of lithium atom is 0.53gcm-3.The edge length of Li is 3.5 .Find out the no of Li atoms in an unit cell.(M=6 94gmol-1)
Answer» Density of lithium atom is 0.53gcm-3.The edge length of Li is 3.5 .Find out the no of Li atoms in an unit cell.(M=6 94gmol-1)

Discussion

6415.	During the electrolysis of acidified water, the reaction taking place at anode is
Answer» During the electrolysis of acidified water, the reaction taking place at anode is

Discussion

6416.	Question 18Zinc sulphate forms a colourless solution in water. Will you observe any colour on adding copper turnings in it?
Answer» Question 18 Zinc sulphate forms a colourless solution in water. Will you observe any colour on adding copper turnings in it?

Discussion

6417.	Isotopes differ in:
Answer» Isotopes differ in:

Discussion

6418.	Q. 20gm of magnesium carbonate sample decomposes on heating to give carbon dioxide and 8gm magnesium oxide . what will be the percentage purity of magnesium carbonate in the sample?1)602)843)754)96
Answer» Q. 20gm of magnesium carbonate sample decomposes on heating to give carbon dioxide and 8gm magnesium oxide . what will be the percentage purity of magnesium carbonate in the sample? 1)60 2)84 3)75 4)96

Discussion

6419.	Accordez l'adjectif tout, toute, tous, toutes avec le nom.
Answer» Accordez l'adjectif tout, toute, tous, toutes avec le nom.

Discussion

6420.	Bi(5) is stronger oxidizing agent than sb(5)
Answer» Bi(5) is stronger oxidizing agent than sb(5)

Discussion

6421.	If the tendency of the electrode is to get reduced, the potential difference between the electrode and electrolyte
Answer» If the tendency of the electrode is to get reduced, the potential difference between the electrode and electrolyte

Discussion

6422.	Explain mole concept.
Answer» Explain mole concept.

Discussion

6423.	In an experiment to test the pH of a given sample using pH paper, four students recorded the following observations. Sample taken pH paper colour turned to (I) Water Green (II) Dil. HCl Red (III) Dil. NaOH Blue (IV) Dil. acetic acid Orange Which one will have pH value of 7?
Answer» In an experiment to test the pH of a given sample using pH paper, four students recorded the following observations. Sample taken pH paper colour turned to (I) Water Green (II) Dil. HCl Red (III) Dil. NaOH Blue (IV) Dil. acetic acid Orange Which one will have pH value of 7?

6423.

In an experiment to test the pH of a given sample using pH paper, four students recorded the following observations. Sample taken pH paper colour turned to (I) Water Green (II) Dil. HCl Red (III) Dil. NaOH Blue (IV) Dil. acetic acid Orange Which one will have pH value of 7?

Answer»

In an experiment to test the pH of a given sample using pH paper, four students recorded the following observations.

Sample taken pH paper colour turned to

(I) Water Green

(II) Dil. HCl Red

(III) Dil. NaOH Blue

(IV) Dil. acetic acid Orange

Which one will have pH value of 7?

Discussion

6424.	Where does pyrolysis takes place
Answer» Where does pyrolysis takes place

Discussion

6425.	(a) Name the acid formed when sulphur dioxide dissolves in water. (b) Name the gas released when sodium carbonate is added to a solution of sulphur dioxide.
Answer» (a) Name the acid formed when sulphur dioxide dissolves in water. (b) Name the gas released when sodium carbonate is added to a solution of sulphur dioxide.

6425.

(a) Name the acid formed when sulphur dioxide dissolves in water. (b) Name the gas released when sodium carbonate is added to a solution of sulphur dioxide.

Answer»

(a) Name the acid formed when sulphur dioxide dissolves in water.

(b) Name the gas released when sodium carbonate is added to a solution of sulphur dioxide.

Discussion

6426.	Which one of the following is not a neutral oxide. (a) CO (b) H2O (c) N2O (d) Na2O
Answer» Which one of the following is not a neutral oxide. (a) $C O$ (b) $H_{2} O$ (c) $N_{2} O$ (d) $N a_{2} O$

Discussion

6427.	Calculate molarity of Na+ and Po4 3- ,in 0.5 molar in Na3Po4(aq)
Answer» Calculate molarity of Na+ and Po4 3- ,in 0.5 molar in Na3Po4(aq)

Discussion

6428.	The formula of most abundant copper ore, chalcopyrite is:
Answer» The formula of most abundant copper ore, chalcopyrite is:

Discussion

6429.	100mL of 2.4V H2O2 require how many grams of KMnO4 in acidic medium for complex reaction?
Answer» 100mL of 2.4V H2O2 require how many grams of KMnO4 in acidic medium for complex reaction?

Discussion

6430.	Why only grass can be digested by herbivores animal why not by human beings explain
Answer» Why only grass can be digested by herbivores animal why not by human beings explain

Discussion

6431.	ntWhich one of the following metal do not evolve H2gas from dilute acidn nt(a) A (EO A+/A =0.25V)n nt(b) B (EO B/B+ = +0.22V)n nt(c) C (EOC+/C = -0.30V)n
Answer» ntWhich one of the following metal do not evolve H2gas from dilute acidn nt(a) A (EO A+/A =0.25V)n nt(b) B (EO B/B+ = +0.22V)n nt(c) C (EOC+/C = -0.30V)n

Discussion

6432.	which of the following statements is not correct? 1.In froth floatation process, pine oil decreases thesurface tension of the solution (2) Van Arkel method is used for refining zirconium (3) Dolomite ore can be considered as ore of bothCa and Mg (4) Aqueous Al2 (SO4)3 is used for electrorefiningof Al
Answer» which of the following statements is not correct? 1.In froth floatation process, pine oil decreases thesurface tension of the solution (2) Van Arkel method is used for refining zirconium (3) Dolomite ore can be considered as ore of bothCa and Mg (4) Aqueous Al2 (SO4)3 is used for electrorefiningof Al

Discussion

6433.	7.In which of the following molecules/ions or all the bonds not equal- 1) XeF4 2) BF4- 3) SF4 4) SiF4
Answer» 7.In which of the following molecules/ions or all the bonds not equal- 1) XeF4 2) BF4- 3) SF4 4) SiF4

Discussion

6434.	How does a Radio control car work? with diagram.
Answer» How does a Radio control car work? with diagram.

Discussion

6435.	80 Why teritary carbocation is more stable than allylic carbocation?
Answer» 80 Why teritary carbocation is more stable than allylic carbocation?

Discussion

6436.	Using the part of the periodic table given below, answer the following questions: [3 MARKS] 1. Na has physical properties similar to which elements and why? 2. Write the electronic configuration of N and P. 3. State one property common to fluorine and chlorine. Group PeriodIIIIIIIVVVIVIIZero1HHe2LiBeBCNOFNe3NaMgAlSiPSClAr4KCa
Answer» Using the part of the periodic table given below, answer the following questions: [3 MARKS] 1. Na has physical properties similar to which elements and why? 2. Write the electronic configuration of N and P. 3. State one property common to fluorine and chlorine. $\begin{matrix} Group Period & I & II & III & IV & V & VI & VII & Zero 1 & H & He 2 & Li & Be & B & C & N & O & F & Ne 3 & Na & Mg & Al & Si & P & S & Cl & Ar 4 & K & Ca \end{matrix}$

6436.

Using the part of the periodic table given below, answer the following questions: [3 MARKS] 1. Na has physical properties similar to which elements and why? 2. Write the electronic configuration of N and P. 3. State one property common to fluorine and chlorine. Group PeriodIIIIIIIVVVIVIIZero1HHe2LiBeBCNOFNe3NaMgAlSiPSClAr4KCa

Answer»

Using the part of the periodic table given below, answer the following questions: [3 MARKS]
1. Na has physical properties similar to which elements and why?
2. Write the electronic configuration of N and P.
3. State one property common to fluorine and chlorine.

$\begin{matrix} Group Period & I & II & III & IV & V & VI & VII & Zero 1 & H & He 2 & Li & Be & B & C & N & O & F & Ne 3 & Na & Mg & Al & Si & P & S & Cl & Ar 4 & K & Ca \end{matrix}$

Discussion

6437.	List two observations which you make when you add a pinch of sodium hydrogen carbonate to acetic acid in a test tube. Write chemical equation for the reaction that occurs.
Answer» List two observations which you make when you add a pinch of sodium hydrogen carbonate to acetic acid in a test tube. Write chemical equation for the reaction that occurs.

Discussion

6438.	Which has the highest weight? (1)1 m^{3 }of water (2)100 L CH_4 (g) at S.T.P (3) 6.02×10 ^{23} molecules of H_2SO_4 (4) 100 moles of He(g)
Answer» Which has the highest weight? (1)1 m^{3 }of water (2)100 L CH_4 (g) at S.T.P (3) 6.02×10 ^{23} molecules of H_2SO_4 (4) 100 moles of He(g)

Discussion

6439.	Classify the following oxides into acidic, basic and amphoteric. CaO, MgO, CO2, SO3, Na2O, ZnO, Al2O3, Fe2O3
Answer» Classify the following oxides into acidic, basic and amphoteric. $C a O$ , $M g O$ , $C O_{2}$ , $S O_{3}$ , $N a_{2} O$ , $Z n O$ , $A l_{2} O_{3}$ , $F e_{2} O_{3}$

Discussion

6440.	44.(NH4)3 po4 h4 have 3.14mole then how many moles of oxygen will be there ?
Answer» 44.(NH4)3 po4 h4 have 3.14mole then how many moles of oxygen will be there ?

Discussion

6441.	Which of the following should be correct according to Hund's rule?
Answer» Which of the following should be correct according to Hund's rule?

Discussion

6442.	According to Bronsted Lowry theory, acids are defined as:
Answer» According to Bronsted Lowry theory, acids are defined as:

Discussion

6443.	What will happen when metals are reacts with salts
Answer» What will happen when metals are reacts with salts

Discussion

6444.	Consider the given chemical reaction S_8 +HNO_3⇒ 8H_2SO_4 +H_2O +NO . The total number of moles of nitric acid required to balance the above chemical equation is?
Answer» Consider the given chemical reaction S_8 +HNO_3⇒ 8H_2SO_4 +H_2O +NO . The total number of moles of nitric acid required to balance the above chemical equation is?

Discussion

6445.	36.CH2CH2I is treated with alc. KOH formed X and again it treated with Br2 then formed Y and it treated with KCN formed Z then What is Z in this reaction.
Answer» 36.CH2CH2I is treated with alc. KOH formed X and again it treated with Br2 then formed Y and it treated with KCN formed Z then What is Z in this reaction.

Discussion

6446.	What happens when aluminium nitride reacts with water
Answer» What happens when aluminium nitride reacts with water

6446.

What happens when aluminium nitride reacts with water

Answer»

What happens when aluminium nitride reacts with water

Discussion

6447.	Write the chemical formula of the following compounds (a) Calcium oxide (b) Calcium Hydroxide (c) Aluminium Sulphate
Answer» Write the chemical formula of the following compounds (a) Calcium oxide (b) Calcium Hydroxide (c) Aluminium Sulphate

6447.

Write the chemical formula of the following compounds (a) Calcium oxide (b) Calcium Hydroxide (c) Aluminium Sulphate

Answer»

Write the chemical formula of the following compounds

(a) Calcium oxide (b) Calcium Hydroxide (c) Aluminium Sulphate

Discussion

6448.	One litre of O2 at NTP reacts with 3 times the volume of CO at NTP. Calculate volume of CO2 formed.
Answer» One litre of $O_{2}$ at NTP reacts with 3 times the volume of CO at NTP. Calculate volume of $C O_{2}$ formed.

Discussion

6449.	Name the fossil fuel which is easy to carry through pipes. Define the term Petrochemicals.
Answer» Name the fossil fuel which is easy to carry through pipes. Define the term Petrochemicals.

Discussion

6450.	Give three kinds of information conveyed by the formula H2O.
Answer» Give three kinds of information conveyed by the formula $H_{2} O .$

Discussion

Explore topic-wise InterviewSolutions in .

Why Li is weakest reducing agent in Free state but strongest reducing agent in solution?

30. Among following how to find electron deficient compound? Options: BCl3, CCl4,PCl5,BeCl2

26. Calculate the mole fraction of NaCl present in 2molal aqueous solution of NaCl

The solution of copper sulphate is.

If the degree of dissociation is given then how to take the values at equilibriumQ. 2HI =H2+I2 The degree of dissociation is a. Calculate expression for equilibrium constant Kc of the reaction.

The total volume of mixture of 2 g of helium and 7 g of nitrogen under S.T.P. conditions is

What is the expression of pH?

2,3-dimethyl butan-2-ol H3PO4−−−−→ X

The number of bonding e- pairs in N2 on the basis of molecular orbital theory is? 1. 3 2. 2 3. 5 4. 4 And how??

Which of the following gas is a colourless gas which also bleaches?

How magnetic quantum no explained zeeman and stark effects?

Density of lithium atom is 0.53gcm-3.The edge length of Li is 3.5 .Find out the no of Li atoms in an unit cell.(M=6 94gmol-1)

During the electrolysis of acidified water, the reaction taking place at anode is

Question 18Zinc sulphate forms a colourless solution in water. Will you observe any colour on adding copper turnings in it?

Isotopes differ in:

Q. 20gm of magnesium carbonate sample decomposes on heating to give carbon dioxide and 8gm magnesium oxide . what will be the percentage purity of magnesium carbonate in the sample?1)602)843)754)96

Accordez l'adjectif tout, toute, tous, toutes avec le nom.

Bi(5) is stronger oxidizing agent than sb(5)

If the tendency of the electrode is to get reduced, the potential difference between the electrode and electrolyte

Explain mole concept.

In an experiment to test the pH of a given sample using pH paper, four students recorded the following observations. Sample taken pH paper colour turned to (I) Water Green (II) Dil. HCl Red (III) Dil. NaOH Blue (IV) Dil. acetic acid Orange Which one will have pH value of 7?

Where does pyrolysis takes place

(a) Name the acid formed when sulphur dioxide dissolves in water. (b) Name the gas released when sodium carbonate is added to a solution of sulphur dioxide.

Which one of the following is not a neutral oxide. (a) CO (b) H2O (c) N2O (d) Na2O

Calculate molarity of Na+ and Po4 3- ,in 0.5 molar in Na3Po4(aq)

The formula of most abundant copper ore, chalcopyrite is:

100mL of 2.4V H2O2 require how many grams of KMnO4 in acidic medium for complex reaction?

Why only grass can be digested by herbivores animal why not by human beings explain

ntWhich one of the following metal do not evolve H2gas from dilute acidn nt(a) A (EO A+/A =0.25V)n nt(b) B (EO B/B+ = +0.22V)n nt(c) C (EOC+/C = -0.30V)n

7.In which of the following molecules/ions or all the bonds not equal- 1) XeF4 2) BF4- 3) SF4 4) SiF4

How does a Radio control car work? with diagram.

80 Why teritary carbocation is more stable than allylic carbocation?

List two observations which you make when you add a pinch of sodium hydrogen carbonate to acetic acid in a test tube. Write chemical equation for the reaction that occurs.

Which has the highest weight? (1)1 m^{3 }of water (2)100 L CH_4 (g) at S.T.P (3) 6.02×10 ^{23} molecules of H_2SO_4 (4) 100 moles of He(g)

Classify the following oxides into acidic, basic and amphoteric. CaO, MgO, CO2, SO3, Na2O, ZnO, Al2O3, Fe2O3

44.(NH4)3 po4 h4 have 3.14mole then how many moles of oxygen will be there ?

Which of the following should be correct according to Hund's rule?

According to Bronsted Lowry theory, acids are defined as:

What will happen when metals are reacts with salts

Consider the given chemical reaction S_8 +HNO_3⇒ 8H_2SO_4 +H_2O +NO . The total number of moles of nitric acid required to balance the above chemical equation is?

36.CH2CH2I is treated with alc. KOH formed X and again it treated with Br2 then formed Y and it treated with KCN formed Z then What is Z in this reaction.

What happens when aluminium nitride reacts with water

Write the chemical formula of the following compounds (a) Calcium oxide (b) Calcium Hydroxide (c) Aluminium Sulphate

One litre of O2 at NTP reacts with 3 times the volume of CO at NTP. Calculate volume of CO2 formed.

Name the fossil fuel which is easy to carry through pipes. Define the term Petrochemicals.

Give three kinds of information conveyed by the formula H2O.