10223 + Interview Questions in Chemistry Page 67 InterviewSolution

3301.	The units of universal gas constant R is
Answer» The units of universal gas constant $R$ is

Discussion

3302.	Which of the following is an example of electrolytic decomposition?
Answer» Which of the following is an example of electrolytic decomposition?

Discussion

3303.	22.14. A steel tape is calibrated at 20^° C. On a cold daywhen the temperature is-15^° C, percentage error inthe tape will be \lbrack Ousteel 1.2x 10-5^° C-1(1) -0.035%(3) 0.012%(2) -0.042%(4)-001896
Answer» 22.14. A steel tape is calibrated at 20^° C. On a cold daywhen the temperature is-15^° C, percentage error inthe tape will be \lbrack Ousteel 1.2x 10-5^° C-1(1) -0.035%(3) 0.012%(2) -0.042%(4)-001896

Discussion

3304.	Question 38Classify each of the following, as a physical or a chemical change. Give reasons.(a) Drying of a shirt in the sun.(b) Rising of hot air over a radiator.(c) Burning of kerosene in a lantern.(d) Change in the colour of black tea on adding lemon juke to it.(e) Churning of milk cream to get butter.
Answer» Question 38 Classify each of the following, as a physical or a chemical change. Give reasons. (a) Drying of a shirt in the sun. (b) Rising of hot air over a radiator. (c) Burning of kerosene in a lantern. (d) Change in the colour of black tea on adding lemon juke to it. (e) Churning of milk cream to get butter.

Discussion

3305.	What are the advantages of preparing solutions? [2 MARKS]
Answer» What are the advantages of preparing solutions? [2 MARKS]

Discussion

3306.	Calculate pH of mixture of 400ml,1/200M H2SO4 + 400ml,1/100M HCl + 200ml of water.
Answer» Calculate pH of mixture of 400ml,1/200M H2SO4 + 400ml,1/100M HCl + 200ml of water.

Discussion

3307.	The number of Faradays(F) required to produce 4.5 g of aluminium from molten AlCl3 is:(Atomic mass of Al=27 u)
Answer» The number of Faradays(F) required to produce $4.5 g$ of aluminium from molten $A l C l_{3}$ is: (Atomic mass of $A l = 27 u$ )

Discussion

3308.	If air is a homogeneous mixture of gases then , the air with dust particles or pollutants is heterogeneous mixture as dust pollutants can be seen by naked eye in the air ? True or False
Answer» If air is a homogeneous mixture of gases then , the air with dust particles or pollutants is heterogeneous mixture as dust pollutants can be seen by naked eye in the air ? True or False

Discussion

3309.	How do we know that which elements are metal and non metal in electronic configuration?
Answer» How do we know that which elements are metal and non metal in electronic configuration?

Discussion

3310.	92 Total planes in CH4 which contains maximum no of atoms are a. 4 b. 6 c. 10 d. 12
Answer» 92 Total planes in CH4 which contains maximum no of atoms are a. 4 b. 6 c. 10 d. 12

Discussion

3311.	Question 3 (b) Give reason for the following observations. b. We can get the smell of perfume sitting several metres away.
Answer» Question 3 (b) Give reason for the following observations. b. We can get the smell of perfume sitting several metres away.

Discussion

3312.	2 M of 100 mL Na2SO4 is mixed with 3 M of100 mL NaCl solution and 1 M of 200 mL CaCl2solution. Then, the ratio of the concentration ofcation and anion is
Answer» 2 M of 100 mL Na2SO4 is mixed with 3 M of 100 mL NaCl solution and 1 M of 200 mL CaCl2 solution. Then, the ratio of the concentration of cation and anion is

Discussion

3313.	The number of periods and groups in Mendeleev 's periodic table. My text book says 9 groups and 7 periods and there is something else on internet?
Answer» The number of periods and groups in Mendeleev 's periodic table. My text book says 9 groups and 7 periods and there is something else on internet?

Discussion

3314.	HCl acid is organic acid because it secrete from gastric juice as well as is a inorganic acid . Explain how ?
Answer» HCl acid is organic acid because it secrete from gastric juice as well as is a inorganic acid . Explain how ?

Discussion

3315.	1 kg of ice at -10 degree Celsius is mixed with 4.4 kg of water at 30 degree Celsius . The final temperature of mixture is
Answer» 1 kg of ice at -10 degree Celsius is mixed with 4.4 kg of water at 30 degree Celsius . The final temperature of mixture is

Discussion

3316.	Number of valence electrons in Cl− ion is ___
Answer» Number of valence electrons in Cl− ion is ___

Discussion

3317.	When a crystal of potassium permanganate is placed at the bottom of the water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of : (a) distribution (b) intrusion (c) diffusion (d) effusion
Answer» When a crystal of potassium permanganate is placed at the bottom of the water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of : (a) distribution (b) intrusion (c) diffusion (d) effusion

3317.

When a crystal of potassium permanganate is placed at the bottom of the water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of : (a) distribution (b) intrusion (c) diffusion (d) effusion

Answer»

When a crystal of potassium permanganate is placed at the bottom of the water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of :

(a) distribution (b) intrusion (c) diffusion (d) effusion

Discussion

3318.	if ab4 is a polar molecule then its possible shape is
Answer» if ab4 is a polar molecule then its possible shape is

Discussion

3319.	Write the formula of calcium hydroxide?
Answer» Write the formula of calcium hydroxide?

Discussion

3320.	A piece of radium is enclosed in a lead container, placed in the vacuum chamber. The radium gives out radioactive rays subjected to a magnetic field? (a) Name the rays A, B and C showing the charge of each. (b) Give two important properties of each. [5 MARKS]
Answer» A piece of radium is enclosed in a lead container, placed in the vacuum chamber. The radium gives out radioactive rays subjected to a magnetic field? (a) Name the rays A, B and C showing the charge of each. (b) Give two important properties of each. [5 MARKS]

Discussion

3321.	Galuber was the first person to prepare HCl gas. Which reactants did he use?
Answer» Galuber was the first person to prepare HCl gas. Which reactants did he use?

Discussion

3322.	What percent of a sample of nitrogen must be allowed to escape if its temperature, pressure and volume are to be changed from 220^{†extdegree⊂}, 3 atm and 1.65 litre to 110^{}, 0.7 atm and 1.00 litre respectively?
Answer» What percent of a sample of nitrogen must be allowed to escape if its temperature, pressure and volume are to be changed from 220^{†extdegree⊂}, 3 atm and 1.65 litre to 110^{}, 0.7 atm and 1.00 litre respectively?

Discussion

3323.	What is the word root of the hydrocarbon chain with 7 carbon atoms?
Answer» What is the word root of the hydrocarbon chain with 7 carbon atoms?

Discussion

3324.	Why is litmus a better natural indicator than another natural indicator?
Answer» Why is litmus a better natural indicator than another natural indicator?

Discussion

3325.	(a) Calculate the number of moles and number of molecules present in 1.4 g of ethylene gas. What is the volume occupied by the same amount of ethylene?(b) What is the vapour density of ethylene?(Avogadro's number = 6 × 1023; Atomic weight of C = 12, H = 1; Molar volume = 22.4 litres at STP)
Answer» (a) Calculate the number of moles and number of molecules present in 1.4 g of ethylene gas. What is the volume occupied by the same amount of ethylene? (b) What is the vapour density of ethylene? (Avogadro's number = 6 × 10²³; Atomic weight of C = 12, H = 1; Molar volume = 22.4 litres at STP)

Discussion

3326.	how no. of shells is infinite in hydrogen atom and is it applied to other elements too?
Answer» how no. of shells is infinite in hydrogen atom and is it applied to other elements too?

Discussion

3327.	70 what is polar solvent and polar covalent bond
Answer» 70 what is polar solvent and polar covalent bond

Discussion

3328.	Elaborate on the law of conservation of mass.
Answer» Elaborate on the law of conservation of mass.

Discussion

3329.	The equivalent mass of a certain bivalent metal is 25 g. The gram molar mass of its anhydrous chloride is:
Answer» The equivalent mass of a certain bivalent metal is $25 g$ . The gram molar mass of its anhydrous chloride is:

Discussion

3330.	A student wants to have 3.011 × 1023 atoms each of magnesium and carbon elements. For this purpose, how much magnesium and carbon will he weigh in grams?
Answer» A student wants to have 3.011 × 102³ atoms each of magnesium and carbon elements. For this purpose, how much magnesium and carbon will he weigh in grams?

Discussion

3331.	5 grams of compound A reacts with 10 grams of compound B to produce a new compound C. What should be the mass of C according to law of conservation of mass?
Answer» 5 grams of compound A reacts with 10 grams of compound B to produce a new compound C. What should be the mass of C according to law of conservation of mass?

Discussion

3332.	Two radioactive nuclides A and B have half-lives of t and 2t respectively. If we start an experiment with one mole of each of them, the ratio of number of moles remaining after a time interval of 6t, will be,
Answer» Two radioactive nuclides $A$ and $B$ have half-lives of $t$ and $2 t$ respectively. If we start an experiment with one mole of each of them, the ratio of number of moles remaining after a time interval of $6 t$ , will be,

Discussion

3333.	Give an example where change in physical state occurs by change in pressure
Answer» Give an example where change in physical state occurs by change in pressure

Discussion

3334.	Distinguish between drying and dehydrating agent.
Answer» Distinguish between drying and dehydrating agent.

Discussion

3335.	For the reduction of NO−3 ion in an aqueous solution, Eo is +0.96 V. Values of Eo for some metal ions are given below.V2+ (aq)+2e−→V E0=−1.19 VFe3+ (aq)+3e−→Fe E0=−0.04 VAu3+ (aq)+3e−→Au E0=+1.40 VHg2+ (aq)+2e−→Hg E0=+0.86 VThe pair(s) of metals that is (are) oxidised by NO−3 in aqueous solution is (are)
Answer» For the reduction of $N O_{3}^{-}$ ion in an aqueous solution, $E^{o}$ is $+ 0.96 V$ . Values of $E^{o}$ for some metal ions are given below. $V^{2 +} (aq) + 2 e^{-} \to V E^{0} = - 1.19 V$ $F e^{3 +} (aq) + 3 e^{-} \to F e E^{0} = - 0.04 V$ $A u^{3 +} (aq) + 3 e^{-} \to A u E^{0} = + 1.40 V$ $H g^{2 +} (aq) + 2 e^{-} \to H g E^{0} = + 0.86 V$ The pair(s) of metals that is (are) oxidised by $N O_{3}^{-}$ in aqueous solution is (are)

Discussion

3336.	An element which can exhibit valencies of 2, 4 and 6 can be:
Answer» An element which can exhibit valencies of 2, 4 and 6 can be:

Discussion

3337.	Which of the following oxo acid of sulphur has O−O bond?
Answer» Which of the following oxo acid of sulphur has $O - O$ bond?

Discussion

3338.	ntWhat is sp mixing? In which compounds it is seen?n
Answer» ntWhat is sp mixing? In which compounds it is seen?n

Discussion

3339.	What is meant by the term rate of a chemical reaction?
Answer» What is meant by the term rate of a chemical reaction?

Discussion

3340.	What is the difference between natural and man made polymers?
Answer» What is the difference between natural and man made polymers?

Discussion

3341.	Question 36 A child wanted to separate the mixture of dyes constituting a sample of ink. He marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in the figure. The filter paper was removed when the water moved near the top of the filter paper. (a) What would you expect to see, if the ink contains three different coloured components? (b) Name the technique used by the child. (c) Suggest one more application of this technique.
Answer» Question 36 A child wanted to separate the mixture of dyes constituting a sample of ink. He marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in the figure. The filter paper was removed when the water moved near the top of the filter paper. (a) What would you expect to see, if the ink contains three different coloured components? (b) Name the technique used by the child. (c) Suggest one more application of this technique.

Discussion

3342.	कोयल की कूक सुनकर कवि की क्या प्रतिक्रिया थी?
Answer» कोयल की कूक सुनकर कवि की क्या प्रतिक्रिया थी?

Discussion

3343.	11.When benzene combusted how many oxygen molecule required a) Acetone b) Propyne c) Propanal d)Ethanal
Answer» 11.When benzene combusted how many oxygen molecule required a) Acetone b) Propyne c) Propanal d)Ethanal

Discussion

3344.	Calculate the mass of 2.4088×10^22 molecules of carbon dioxide
Answer» Calculate the mass of 2.4088×10^22 molecules of carbon dioxide

Discussion

3345.	if work done by the system is 300J when 100cal heat is supplied to it.The change in internal engergy during the process is?
Answer» if work done by the system is 300J when 100cal heat is supplied to it.The change in internal engergy during the process is?

Discussion

3346.	The acid present in vinegar is
Answer» The acid present in vinegar is

Discussion

3347.	What is the n-factor of H3BO3?
Answer» What is the n-factor of $H_{3} B O_{3}$ ?

Discussion

3348.	How did we come to know what are the gases present in sun?
Answer» How did we come to know what are the gases present in sun?

Discussion

3349.	balance zn + hcl→ zncl +h
Answer» balance zn + hcl→ zncl +h

Discussion

3350.	When steam is passed over the red-hot coke then which of the following is formed:-
Answer» When steam is passed over the red-hot coke then which of the following is formed:-

Discussion

Explore topic-wise InterviewSolutions in .

The units of universal gas constant R is

Which of the following is an example of electrolytic decomposition?

22.14. A steel tape is calibrated at 20^° C. On a cold daywhen the temperature is-15^° C, percentage error inthe tape will be \lbrack Ousteel 1.2x 10-5^° C-1(1) -0.035%(3) 0.012%(2) -0.042%(4)-001896

What are the advantages of preparing solutions? [2 MARKS]

Calculate pH of mixture of 400ml,1/200M H2SO4 + 400ml,1/100M HCl + 200ml of water.

The number of Faradays(F) required to produce 4.5 g of aluminium from molten AlCl3 is:(Atomic mass of Al=27 u)

If air is a homogeneous mixture of gases then , the air with dust particles or pollutants is heterogeneous mixture as dust pollutants can be seen by naked eye in the air ? True or False

How do we know that which elements are metal and non metal in electronic configuration?

92 Total planes in CH4 which contains maximum no of atoms are a. 4 b. 6 c. 10 d. 12

Question 3 (b) Give reason for the following observations. b. We can get the smell of perfume sitting several metres away.

2 M of 100 mL Na2SO4 is mixed with 3 M of100 mL NaCl solution and 1 M of 200 mL CaCl2solution. Then, the ratio of the concentration ofcation and anion is

The number of periods and groups in Mendeleev 's periodic table. My text book says 9 groups and 7 periods and there is something else on internet?

HCl acid is organic acid because it secrete from gastric juice as well as is a inorganic acid . Explain how ?

1 kg of ice at -10 degree Celsius is mixed with 4.4 kg of water at 30 degree Celsius . The final temperature of mixture is

Number of valence electrons in Cl− ion is ___

When a crystal of potassium permanganate is placed at the bottom of the water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of : (a) distribution (b) intrusion (c) diffusion (d) effusion

if ab4 is a polar molecule then its possible shape is

Write the formula of calcium hydroxide?

A piece of radium is enclosed in a lead container, placed in the vacuum chamber. The radium gives out radioactive rays subjected to a magnetic field? (a) Name the rays A, B and C showing the charge of each. (b) Give two important properties of each. [5 MARKS]

Galuber was the first person to prepare HCl gas. Which reactants did he use?

What percent of a sample of nitrogen must be allowed to escape if its temperature, pressure and volume are to be changed from 220^{†extdegree⊂}, 3 atm and 1.65 litre to 110^{}, 0.7 atm and 1.00 litre respectively?

What is the word root of the hydrocarbon chain with 7 carbon atoms?

Why is litmus a better natural indicator than another natural indicator?

(a) Calculate the number of moles and number of molecules present in 1.4 g of ethylene gas. What is the volume occupied by the same amount of ethylene?(b) What is the vapour density of ethylene?(Avogadro's number = 6 × 1023; Atomic weight of C = 12, H = 1; Molar volume = 22.4 litres at STP)

how no. of shells is infinite in hydrogen atom and is it applied to other elements too?

70 what is polar solvent and polar covalent bond

Elaborate on the law of conservation of mass.

The equivalent mass of a certain bivalent metal is 25 g. The gram molar mass of its anhydrous chloride is:

A student wants to have 3.011 × 1023 atoms each of magnesium and carbon elements. For this purpose, how much magnesium and carbon will he weigh in grams?

5 grams of compound A reacts with 10 grams of compound B to produce a new compound C. What should be the mass of C according to law of conservation of mass?

Two radioactive nuclides A and B have half-lives of t and 2t respectively. If we start an experiment with one mole of each of them, the ratio of number of moles remaining after a time interval of 6t, will be,

Give an example where change in physical state occurs by change in pressure

Distinguish between drying and dehydrating agent.

An element which can exhibit valencies of 2, 4 and 6 can be:

Which of the following oxo acid of sulphur has O−O bond?

ntWhat is sp mixing? In which compounds it is seen?n

What is meant by the term rate of a chemical reaction?

What is the difference between natural and man made polymers?

कोयल की कूक सुनकर कवि की क्या प्रतिक्रिया थी?

11.When benzene combusted how many oxygen molecule required a) Acetone b) Propyne c) Propanal d)Ethanal

Calculate the mass of 2.4088×10^22 molecules of carbon dioxide

if work done by the system is 300J when 100cal heat is supplied to it.The change in internal engergy during the process is?

The acid present in vinegar is

What is the n-factor of H3BO3?

How did we come to know what are the gases present in sun?

balance zn + hcl→ zncl +h

When steam is passed over the red-hot coke then which of the following is formed:-