5083 + Interview Questions in Chemistry Page 50 InterviewSolution

2451.	The half life of a radioactive substance is 20 minutes. The time taken between 50 % decay and 87.5% decay of the substance will be
Answer» The half life of a radioactive substance is 20 minutes. The time taken between 50 $%$ decay and 87.5 $%$ decay of the substance will be

Discussion

2452.	Specific conductance of 0.1 M HA is 3.75×10−4ohm−1cm−1. If λ∞(HA)=250 ohm−1cm2mol−1, the dissociation constant Ka of HA is :
Answer» Specific conductance of 0.1 M HA is $3.75 \times 10^{- 4} o h m^{- 1} c m^{- 1} .$ If $λ^{\infty} (H A) = 250 o h m^{- 1} c m^{2} m o l^{- 1},$ the dissociation constant $K_{a}$ of HA is :

Discussion

2453.	Define the term sludge. Name two chemicals that are used to disinfect water? [2 MARKS]
Answer» Define the term sludge. Name two chemicals that are used to disinfect water? [2 MARKS]

Discussion

2454.	What is the term given for the molecular attraction that holds two unlike substances together?
Answer» What is the term given for the molecular attraction that holds two unlike substances together?

Discussion

2455.	Which of the following is most suitable for the growth of plants?
Answer» Which of the following is most suitable for the growth of plants?

Discussion

2456.	The physical process of converting a liquid into its gaseous state is called ___________________.
Answer» The physical process of converting a liquid into its gaseous state is called ___________________.

Discussion

2457.	why aqueous cu2+ is more stable than cu+ ?
Answer» why aqueous cu2+ is more stable than cu+ ?

Discussion

2458.	Which of the following can not conduct electricity in a fused or molten state?
Answer» Which of the following can not conduct electricity in a fused or molten state?

Discussion

2459.	Why are acids not stored in metal containers?
Answer» Why are acids not stored in metal containers?

Discussion

2460.	Why is the iron tyre heated before fitting it on a wooden wheel?
Answer» Why is the iron tyre heated before fitting it on a wooden wheel?

Discussion

2461.	Himanshu was suffering from acidity, so he went to a doctor for the treatment. The doctor would have advised him to take which of the following?
Answer» Himanshu was suffering from acidity, so he went to a doctor for the treatment. The doctor would have advised him to take which of the following?

Discussion

2462.	Two solids reacted to form a single product that is also a solid. The total mass of the solids (reactants + product) was measured at regular time intervals. Which graph would most likely show the expected result?
Answer» Two solids reacted to form a single product that is also a solid. The total mass of the solids (reactants + product) was measured at regular time intervals. Which graph would most likely show the expected result?

Discussion

2463.	Question 30Which among the following are physical or chemical changes?(a) Evaporation of petrol.(b) Burning of Liquefied Petroleum Gas (LPG).(c) Heating of an iron rod to red hot.(d) Curdling of milk.(e) Sublimation of solid ammonium chloride.
Answer» Question 30 Which among the following are physical or chemical changes? (a) Evaporation of petrol. (b) Burning of Liquefied Petroleum Gas (LPG). (c) Heating of an iron rod to red hot. (d) Curdling of milk. (e) Sublimation of solid ammonium chloride.

2463.

Question 30Which among the following are physical or chemical changes?(a) Evaporation of petrol.(b) Burning of Liquefied Petroleum Gas (LPG).(c) Heating of an iron rod to red hot.(d) Curdling of milk.(e) Sublimation of solid ammonium chloride.

Answer»

Question 30

Which among the following are physical or chemical changes?

(a) Evaporation of petrol.

(b) Burning of Liquefied Petroleum Gas (LPG).

(c) Heating of an iron rod to red hot.

(d) Curdling of milk.

(e) Sublimation of solid ammonium chloride.

Discussion

2464.	co+o2 gives co2 and c+o2 also give co2 in both cases there is difference in reaction then how product is same
Answer» co+o2 gives co2 and c+o2 also give co2 in both cases there is difference in reaction then how product is same

Discussion

2465.	What is a chemical toilet and how does it helps in waste management?
Answer» What is a chemical toilet and how does it helps in waste management?

Discussion

2466.	Why does the electrolytic conduction decreases with increase in concentration of solution
Answer» Why does the electrolytic conduction decreases with increase in concentration of solution

Discussion

2467.	A hypothetical reaction, A2+B2→2AB follows the mechanism given belowA2⇌A+A (fast)A+B2→AB+B (slow)A+B→AB (fast)The order of the overall reaction is:
Answer» A hypothetical reaction, $A_{2} + B_{2} \to 2 A B$ follows the mechanism given below $A_{2} ⇌ A + A (fast)$ $A + B_{2} \to A B + B (slow)$ $A + B \to A B (fast)$ The order of the overall reaction is:

Discussion

2468.	Name two soft metals which can be cut with a knife.
Answer» Name two soft metals which can be cut with a knife.

Discussion

2469.	___ is the property in which the molecules at the surface are attracted by the molecules that are below.
Answer» ___ is the property in which the molecules at the surface are attracted by the molecules that are below.

Discussion

2470.	The nature of mountain soil is
Answer» The nature of mountain soil is

Discussion

2471.	An equilibrium mixture for the reaction 2 H2S = 2H2+ S2 has 1 mole of hydrogen sulphide,0.2 mole of H2 and 0.8 mole of S2 in 2 Litre vessel.The value of Kc is A 0.004 B 0.080 C 0.016 D 0.160
Answer» An equilibrium mixture for the reaction 2 H2S = 2H2+ S2 has 1 mole of hydrogen sulphide,0.2 mole of H2 and 0.8 mole of S2 in 2 Litre vessel.The value of Kc is A 0.004 B 0.080 C 0.016 D 0.160

Discussion

2472.	Maximum number of electrons in a subshell of an atom is determined by the following:
Answer» Maximum number of electrons in a subshell of an atom is determined by the following:

Discussion

2473.	The noble gas which is radioactive is:
Answer» The noble gas which is radioactive is:

Discussion

2474.	Which one of these group 14 elements has the largest atomic radius?
Answer» Which one of these group 14 elements has the largest atomic radius?

Discussion

2475.	Write the chemical formula of aluminium chloride. The valency of aluminium and chlorine is 3 and 1 respectively.
Answer» Write the chemical formula of aluminium chloride. The valency of aluminium and chlorine is 3 and 1 respectively.

Discussion

2476.	Hard water when passed through ion exchanger containing resin RSO3Na group becomes free from:
Answer» Hard water when passed through ion exchanger containing resin $R S O_{3} N a$ group becomes free from:

Discussion

2477.	how many significant figures are present in Avogadro's number ? Does it contain infinite number of significant figures as it is a constant?
Answer» how many significant figures are present in Avogadro's number ? Does it contain infinite number of significant figures as it is a constant?

Discussion

2478.	Question 10Why is respiration considered an exothermic reaction? Explain.
Answer» Question 10 Why is respiration considered an exothermic reaction? Explain.

Discussion

2479.	Which of the following are examples of neutralisation reaction?
Answer» Which of the following are examples of neutralisation reaction?

Discussion

2480.	To obtain wool, the fleece has to be extracted from the sheep. This process is called ___.
Answer» To obtain wool, the fleece has to be extracted from the sheep. This process is called ___.

Discussion

2481.	Sorter's disease is caused by:
Answer» Sorter's disease is caused by:

Discussion

2482.	Limestone powder disappears by adding dilute hydrochloric acids.Write the word equation for this chemical change.
Answer» Limestone powder disappears by adding dilute hydrochloric acids. Write the word equation for this chemical change.

Discussion

2483.	50. The conductivity of a solution containing 1 gram of anhydrous BaCl2 in 200 cm3 of water has been found to be 0.0058 S/cm.What are the molar conductivity and equivalent conductivity of the solution ?(At. at of Ba=137 and Cl= 35.5)
Answer» 50. The conductivity of a solution containing 1 gram of anhydrous BaCl2 in 200 cm3 of water has been found to be 0.0058 S/cm.What are the molar conductivity and equivalent conductivity of the solution ?(At. at of Ba=137 and Cl= 35.5)

Discussion

2484.	A student was given an unknown solution in a test-tube. When he added universal indicator to the test-tube, the solution turned violet. The unknown solution is most likely to be :(1) baking soda solution(2) washing soda solution(3) caustic soda solution (4) household ammonia solution
Answer» A student was given an unknown solution in a test-tube. When he added universal indicator to the test-tube, the solution turned violet. The unknown solution is most likely to be : (1) baking soda solution (2) washing soda solution (3) caustic soda solution (4) household ammonia solution

Discussion

2485.	coordination number of diamond with reason
Answer» coordination number of diamond with reason

Discussion

2486.	The pH of a solution is found to be 4.5. What is the nature of the solution?
Answer» The pH of a solution is found to be 4.5. What is the nature of the solution?

Discussion

2487.	.............. hydrocarbons undergo addition reaction
Answer» .............. hydrocarbons undergo addition reaction

Discussion

2488.	Paheli went to the market to buy sarees for her mother. She took out a thread from the edges of the two sarees shown by the shopkeeper and burnt them. One thread burnt with a smell of burning hair and the other burnt with the smell of burning paper. Which thread is from a pure cotton saree and which one from a pure silk saree? Give a reason for your answer.
Answer» Paheli went to the market to buy sarees for her mother. She took out a thread from the edges of the two sarees shown by the shopkeeper and burnt them. One thread burnt with a smell of burning hair and the other burnt with the smell of burning paper. Which thread is from a pure cotton saree and which one from a pure silk saree? Give a reason for your answer.

Discussion

2489.	Since decades, Antarctica has been a place of intense scientific research. Various countries have established their bases in Antarctica to study the impact of climate change. The ozone hole was discovered in 1985 in Antarctica. Which of the following can be associated with ozone hole?
Answer» Since decades, Antarctica has been a place of intense scientific research. Various countries have established their bases in Antarctica to study the impact of climate change. The ozone hole was discovered in 1985 in Antarctica. Which of the following can be associated with ozone hole?

Discussion

2490.	is raoults law applicable for two liquids when mixed react with each other to form another compound?
Answer» is raoults law applicable for two liquids when mixed react with each other to form another compound?

Discussion

2491.	Which of the following generates wastewater?
Answer» Which of the following generates wastewater?

Discussion

2492.	Large volumes of CNG is filled in small cylinders easily due to which property of gases?
Answer» Large volumes of CNG is filled in small cylinders easily due to which property of gases?

Discussion

2493.	The correct sequence to get cloth is:
Answer» The correct sequence to get cloth is:

Discussion

2494.	Which of the following fluids in a healthy body has acidic in nature?
Answer» Which of the following fluids in a healthy body has acidic in nature?

Discussion

2495.	Complete the following reaction: H2SO4+2NaOH→
Answer» Complete the following reaction: $H_{2} {SO}_{4} + 2 NaOH \to$

2495.

Complete the following reaction: H2SO4+2NaOH→

Answer»

Complete the following reaction:

$H_{2} {SO}_{4} + 2 NaOH \to$

Discussion

2496.	What is the catalyst used for the decomposition of potassium chlorate into potassium chloride and oxygen at a lower temperature?
Answer» What is the catalyst used for the decomposition of potassium chlorate into potassium chloride and oxygen at a lower temperature?

Discussion

2497.	Classify acids on the basis of their sources and explain each of them with examples.
Answer» Classify acids on the basis of their sources and explain each of them with examples.

Discussion

2498.	A pipe carrying sewage is called ____________.
Answer» A pipe carrying sewage is called ____________.

Discussion

2499.	Explain nuclear bomb
Answer» Explain nuclear bomb

Discussion

2500.	what is john teller effect? what compounds show this effect
Answer» what is john teller effect? what compounds show this effect

Discussion

Explore topic-wise InterviewSolutions in .

The half life of a radioactive substance is 20 minutes. The time taken between 50 % decay and 87.5% decay of the substance will be

Specific conductance of 0.1 M HA is 3.75×10−4ohm−1cm−1. If λ∞(HA)=250 ohm−1cm2mol−1, the dissociation constant Ka of HA is :

Define the term sludge. Name two chemicals that are used to disinfect water? [2 MARKS]

What is the term given for the molecular attraction that holds two unlike substances together?

Which of the following is most suitable for the growth of plants?

The physical process of converting a liquid into its gaseous state is called ___________________.

why aqueous cu2+ is more stable than cu+ ?

Which of the following can not conduct electricity in a fused or molten state?

Why are acids not stored in metal containers?

Why is the iron tyre heated before fitting it on a wooden wheel?

Himanshu was suffering from acidity, so he went to a doctor for the treatment. The doctor would have advised him to take which of the following?

Two solids reacted to form a single product that is also a solid. The total mass of the solids (reactants + product) was measured at regular time intervals. Which graph would most likely show the expected result?

Question 30Which among the following are physical or chemical changes?(a) Evaporation of petrol.(b) Burning of Liquefied Petroleum Gas (LPG).(c) Heating of an iron rod to red hot.(d) Curdling of milk.(e) Sublimation of solid ammonium chloride.

co+o2 gives co2 and c+o2 also give co2 in both cases there is difference in reaction then how product is same

What is a chemical toilet and how does it helps in waste management?

Why does the electrolytic conduction decreases with increase in concentration of solution

A hypothetical reaction, A2+B2→2AB follows the mechanism given belowA2⇌A+A (fast)A+B2→AB+B (slow)A+B→AB (fast)The order of the overall reaction is:

Name two soft metals which can be cut with a knife.

___ is the property in which the molecules at the surface are attracted by the molecules that are below.

The nature of mountain soil is

An equilibrium mixture for the reaction 2 H2S = 2H2+ S2 has 1 mole of hydrogen sulphide,0.2 mole of H2 and 0.8 mole of S2 in 2 Litre vessel.The value of Kc is A 0.004 B 0.080 C 0.016 D 0.160

Maximum number of electrons in a subshell of an atom is determined by the following:

The noble gas which is radioactive is:

Which one of these group 14 elements has the largest atomic radius?

Write the chemical formula of aluminium chloride. The valency of aluminium and chlorine is 3 and 1 respectively.

Hard water when passed through ion exchanger containing resin RSO3Na group becomes free from:

how many significant figures are present in Avogadro's number ? Does it contain infinite number of significant figures as it is a constant?

Question 10Why is respiration considered an exothermic reaction? Explain.

Which of the following are examples of neutralisation reaction?

To obtain wool, the fleece has to be extracted from the sheep. This process is called ___.

Sorter's disease is caused by:

Limestone powder disappears by adding dilute hydrochloric acids.Write the word equation for this chemical change.

50. The conductivity of a solution containing 1 gram of anhydrous BaCl2 in 200 cm3 of water has been found to be 0.0058 S/cm.What are the molar conductivity and equivalent conductivity of the solution ?(At. at of Ba=137 and Cl= 35.5)

A student was given an unknown solution in a test-tube. When he added universal indicator to the test-tube, the solution turned violet. The unknown solution is most likely to be :(1) baking soda solution(2) washing soda solution(3) caustic soda solution (4) household ammonia solution

coordination number of diamond with reason

The pH of a solution is found to be 4.5. What is the nature of the solution?

.............. hydrocarbons undergo addition reaction

Since decades, Antarctica has been a place of intense scientific research. Various countries have established their bases in Antarctica to study the impact of climate change. The ozone hole was discovered in 1985 in Antarctica. Which of the following can be associated with ozone hole?

is raoults law applicable for two liquids when mixed react with each other to form another compound?

Which of the following generates wastewater?

Large volumes of CNG is filled in small cylinders easily due to which property of gases?

The correct sequence to get cloth is: ​

Which of the following fluids in a healthy body has acidic in nature?

Complete the following reaction: H2SO4+2NaOH→

What is the catalyst used for the decomposition of potassium chlorate into potassium chloride and oxygen at a lower temperature?

Classify acids on the basis of their sources and explain each of them with examples.

A pipe carrying sewage is called ____________.

Explain nuclear bomb

what is john teller effect? what compounds show this effect

The correct sequence to get cloth is: