15280 + Interview Questions in Chemistry Page 126 InterviewSolution

6251.	The number of types of bonds between two carbonatoms in calcium carbide is :- (1) One sigma, two pi (2) One sigma, one pi (3) Two sigma, one pi (4) Two sigma, two pi
Answer» The number of types of bonds between two carbonatoms in calcium carbide is :- (1) One sigma, two pi (2) One sigma, one pi (3) Two sigma, one pi (4) Two sigma, two pi

Discussion

6252.	If a letter of English alphabet is chosen at random, then the probability that the letter is a consonant is:
Answer» If a letter of English alphabet is chosen at random, then the probability that the letter is a consonant is:

Discussion

6253.	The atom of an element has electronic configuration 2, 8, 8, 2.(a) What is the atomic number of the element?(b) To which of the following elements would it be chemically similar? (Atomic numbers of elements are given in brackets) He (2); O (8); Mg (12); K (19)Give reason for your choice.
Answer» The atom of an element has electronic configuration 2, 8, 8, 2. (a) What is the atomic number of the element? (b) To which of the following elements would it be chemically similar? (Atomic numbers of elements are given in brackets) He (2); O (8); Mg (12); K (19) Give reason for your choice.

Discussion

6254.	Non metallic oxides are ______ in nature.
Answer» Non metallic oxides are ______ in nature.

Discussion

6255.	Write the electronic configuration of the elements with atomic number 13, 14 and 15.
Answer» Write the electronic configuration of the elements with atomic number 13, 14 and 15.

Discussion

6256.	In mass spectrograph we first take a molecular sample and then convert into positive ions why ? And it is given that these ions are then allowed to pass through uniform electric and magnetic field which make them execute circular motion . the radius of the circular path is proportional to the mass of charged particle and hence gives the molecular mass . how the molecular mass is calculated in terms of radius and mass of charged particle ?
Answer» In mass spectrograph we first take a molecular sample and then convert into positive ions why ? And it is given that these ions are then allowed to pass through uniform electric and magnetic field which make them execute circular motion . the radius of the circular path is proportional to the mass of charged particle and hence gives the molecular mass . how the molecular mass is calculated in terms of radius and mass of charged particle ?

Discussion

6257.	Molar mass is the mass (in grams) of how many moles of a substance?
Answer» Molar mass is the mass (in grams) of how many moles of a substance?

Discussion

6258.	How you can behave as an active citizen and help in reduction in waste generation? [3 MARKS]
Answer» How you can behave as an active citizen and help in reduction in waste generation? [3 MARKS]

Discussion

6259.	What is limiting reagent? Explain with example.
Answer» What is limiting reagent? Explain with example.

Discussion

6260.	Which of the following contains maximum no. of molecules?
Answer» Which of the following contains maximum no. of molecules?

Discussion

6261.	How will you differentiate that whether the given gas is ethane or ethene?
Answer» How will you differentiate that whether the given gas is ethane or ethene?

Discussion

6262.	Differentiate between: Detergents and soaps
Answer» Differentiate between: Detergents and soaps

6262.

Differentiate between: Detergents and soaps

Answer»

Differentiate between: Detergents and soaps

Discussion

6263.	n - hexane and n - heptane, when passed through Cr2O3 supported over alumina at 6000 C respectively give
Answer» n - hexane and n - heptane, when passed through $C r_{2} O_{3}$ supported over alumina at $600^{0}$ C respectively give

Discussion

6264.	Which of the following substance gets liberated at the anode during the electrolysis of aqueous NaCl?
Answer» Which of the following substance gets liberated at the anode during the electrolysis of aqueous NaCl?

Discussion

6265.	(a) Esters are sweet-smelling substances and are used in making perfumes. Describe an activity for the preparation of an ester with the help of a well-labelled diagram. Write an equation for the chemical reaction involved in the formation of the ester. Also writer the names of all the substances involved in the process of esterification. (b) State any two uses of esters.
Answer» (a) Esters are sweet-smelling substances and are used in making perfumes. Describe an activity for the preparation of an ester with the help of a well-labelled diagram. Write an equation for the chemical reaction involved in the formation of the ester. Also writer the names of all the substances involved in the process of esterification. (b) State any two uses of esters.

Discussion

6266.	Describe one reaction of ethanol.
Answer» Describe one reaction of ethanol.

Discussion

6267.	Does ethanone exist? How does its structure look like
Answer» Does ethanone exist? How does its structure look like

Discussion

6268.	Alkanes readily burn in excess of air or Oxygen to give
Answer» Alkanes readily burn in excess of air or Oxygen to give

Discussion

6269.	calculate percentage of carbon in ethanol (c2h5OH
Answer» calculate percentage of carbon in ethanol (c2h5OH

Discussion

6270.	(a) What is meant by saying that the metals are malleable and ductile ? Explain with examples. (b) Name two metals which are both malleable and ductile. (c) Which property of iron metal is utilised in producing iron sheets required for making buckets? (d) which propert of copper metal is utilised in amking thin wires?
Answer» (a) What is meant by saying that the metals are malleable and ductile ? Explain with examples. (b) Name two metals which are both malleable and ductile. (c) Which property of iron metal is utilised in producing iron sheets required for making buckets? (d) which propert of copper metal is utilised in amking thin wires?

Discussion

6271.	(a) How were the positions of isotopes of an element decided in the modern periodic table ? (b) How were the positions of cobalt and nickel resolved in the modern periodic table ? (c) Where should hydrogen be placed in the modern periodic table ? Give reason for your answer.
Answer» (a) How were the positions of isotopes of an element decided in the modern periodic table ? (b) How were the positions of cobalt and nickel resolved in the modern periodic table ? (c) Where should hydrogen be placed in the modern periodic table ? Give reason for your answer.

6271.

(a) How were the positions of isotopes of an element decided in the modern periodic table ? (b) How were the positions of cobalt and nickel resolved in the modern periodic table ? (c) Where should hydrogen be placed in the modern periodic table ? Give reason for your answer.

Answer»

(a) How were the positions of isotopes of an element decided in the modern periodic table ?

(b) How were the positions of cobalt and nickel resolved in the modern periodic table ?

(c) Where should hydrogen be placed in the modern periodic table ? Give reason for your answer.

Discussion

6272.	What is a functional group in a carbon compound? Identify the functional group present in CH3COOH and C2H5OH.
Answer» What is a functional group in a carbon compound? Identify the functional group present in ${CH}_{3} COOH$ and $C_{2} H_{5} OH$ .

Discussion

6273.	Which is the correct structure of compound 1-Methoxy-2-(2-methoxy ethoxy)ethane?
Answer» Which is the correct structure of compound $1-Methoxy-2-(2-methoxy ethoxy)ethane$ ?

Discussion

6274.	25. Give reason: (A)white silver chloride turns grey in sunlight (B)why digestion is as decomposition reaction (B)why are the bags of Potato chips usually flushed with nitrogen gas (D)why does coppervessels lose their shine when exposed with air
Answer» 25. Give reason: (A)white silver chloride turns grey in sunlight (B)why digestion is as decomposition reaction (B)why are the bags of Potato chips usually flushed with nitrogen gas (D)why does coppervessels lose their shine when exposed with air

Discussion

6275.	an oxide of metal have 20% oxygen , the equivalent weight of oxide is
Answer» an oxide of metal have 20% oxygen , the equivalent weight of oxide is

Discussion

6276.	The standard reduction potentials at 250 C of Li+ /Li , Ba2+ /Ba , Na+ /Na and Mg2+ /Mg are -3.05 , -2.73 , -2.71 and -2.37 volt respectively. Which one of the following is the strongest oxidizing agent?
Answer» The standard reduction potentials at $25^{0}$ C of $L i^{+}$ /Li , $B a^{2 +}$ /Ba , $N a^{+}$ /Na and $M g^{2 +}$ /Mg are -3.05 , -2.73 , -2.71 and -2.37 volt respectively. Which one of the following is the strongest oxidizing agent?

Discussion

6277.	Consider the reaction A → B. Which of the following defines the rate of this reaction?
Answer» Consider the reaction A $\to$ B. Which of the following defines the rate of this reaction?

Discussion

6278.	If A2+ has same L. E as that of Na+ and B2- has same L. E as that of Cl-. If the L. E of NaCl is X. Then find for AB.
Answer» If A2+ has same L. E as that of Na+ and B2- has same L. E as that of Cl-. If the L. E of NaCl is X. Then find for AB.

Discussion

6279.	the first excited state of Cl^- ion will have degeneracy of
Answer» the first excited state of Cl^- ion will have degeneracy of

Discussion

6280.	What mass of iron will be obtained in pure state from 100kg of an iron ore containing 90% FeO
Answer» What mass of iron will be obtained in pure state from 100kg of an iron ore containing 90% FeO

Discussion

6281.	What pH values can a universal indicator detect?
Answer» What pH values can a universal indicator detect?

Discussion

6282.	Can an organic compound having a formula CnHn is possible.give reasons to justify your answer.
Answer» Can an organic compound having a formula CnHn is possible.give reasons to justify your answer.

Discussion

6283.	What happens when dilute hydrochloric acid is added to lead nitrate solution?
Answer» What happens when dilute hydrochloric acid is added to lead nitrate solution?

Discussion

6284.	What will happen if deer is missing in the food chain given below? Grass→Deer→Tiger→ (a) The population of tigers increases (b) The population of grass decreases (c) Tigers will start eating grass (d) The population of tigers decreases and the population of grass increases.
Answer» What will happen if deer is missing in the food chain given below? $G r a s s \to D e e r \to T i g e r \to$ (a) The population of tigers increases (b) The population of grass decreases (c) Tigers will start eating grass (d) The population of tigers decreases and the population of grass increases.

6284.

What will happen if deer is missing in the food chain given below? Grass→Deer→Tiger→ (a) The population of tigers increases (b) The population of grass decreases (c) Tigers will start eating grass (d) The population of tigers decreases and the population of grass increases.

Answer»

What will happen if deer is missing in the food chain given below? $G r a s s \to D e e r \to T i g e r \to$

(a) The population of tigers increases

(b) The population of grass decreases

(c) Tigers will start eating grass

(d) The population of tigers decreases and the population of grass increases.

Discussion

6285.	Consider the given system in equilibrium: 2SO2(g)+O2(g)⇋2SO3(g)+heat What effect will addition of vanadium pentoxide have on the given equilibrium system?
Answer» Consider the given system in equilibrium: $2 S O_{2} (g) + O_{2} (g) ⇋ 2 S O_{3} (g) + h e a t$ What effect will addition of vanadium pentoxide have on the given equilibrium system?

6285.

Consider the given system in equilibrium: 2SO2(g)+O2(g)⇋2SO3(g)+heat What effect will addition of vanadium pentoxide have on the given equilibrium system?

Answer»

Consider the given system in equilibrium:

$2 S O_{2} (g) + O_{2} (g) ⇋ 2 S O_{3} (g) + h e a t$

What effect will addition of vanadium pentoxide have on the given equilibrium system?

Discussion

6286.	What will be the product of the given reaction?
Answer» What will be the product of the given reaction?

Discussion

6287.	explain redox reaction in brief
Answer» explain redox reaction in brief

Discussion

6288.	The series of carbon compounds in which two successive compounds differ by –CH2 unit is called ___ .
Answer» The series of carbon compounds in which two successive compounds differ by $- C H_{2}$ unit is called ___ .

Discussion

6289.	Why acids are sour in taste and bases are bitter in taste?
Answer» Why acids are sour in taste and bases are bitter in taste?

Discussion

6290.	Mendeleev's contributions to the concept of the periodic table laid the foundation for the Modern Periodic Table. Give reasons
Answer» Mendeleev's contributions to the concept of the periodic table laid the foundation for the Modern Periodic Table. Give reasons

6290.

Mendeleev's contributions to the concept of the periodic table laid the foundation for the Modern Periodic Table. Give reasons

Answer»

Mendeleev's contributions to the concept of the periodic table laid the foundation for the Modern Periodic Table.

Give reasons

Discussion

6291.	White silver chloride in sunlight turns to
Answer» White silver chloride in sunlight turns to

Discussion

6292.	87.An electrolysed cell is composed of Cu and Zn. A current of 9.65A is drawn from a cell for 1 hour.Then the loss in mass at anode and gain in mass at cathode, respectively could be
Answer» 87.An electrolysed cell is composed of Cu and Zn. A current of 9.65A is drawn from a cell for 1 hour.Then the loss in mass at anode and gain in mass at cathode, respectively could be

Discussion

6293.	A gas mixture contains 50% helium and 50% methane by volume at STP. What is the percentage by mass of methane in the mixture? 1. 20% 2. 40% 3. 60% 4. 80
Answer» A gas mixture contains 50% helium and 50% methane by volume at STP. What is the percentage by mass of methane in the mixture? 1. 20% 2. 40% 3. 60% 4. 80

Discussion

6294.	Which of the following acid has the highest concentration of H+ ions?
Answer» Which of the following acid has the highest concentration of $H^{+}$ ions?

Discussion

6295.	why ammonia and phosphine has much difference in bond angle
Answer» why ammonia and phosphine has much difference in bond angle

Discussion

6296.	Find out ratio of enrgy of second excited state of hydrogen to third excited state of helium.
Answer» Find out ratio of enrgy of second excited state of hydrogen to third excited state of helium.

Discussion

6297.	Which of these metals do not react with dilute acids?
Answer» Which of these metals do not react with dilute acids?

Discussion

6298.	Which of the following methods can be used for preventing corrosion?
Answer» Which of the following methods can be used for preventing corrosion?

Discussion

6299.	Concentrated sulphuric acid is a good drying agent. Can you tell why concentrated H2SO4 is not used to dry ammonia?
Answer» Concentrated sulphuric acid is a good drying agent. Can you tell why concentrated $H_{2} S O_{4}$ is not used to dry ammonia?

6299.

Concentrated sulphuric acid is a good drying agent. Can you tell why concentrated H2SO4 is not used to dry ammonia?

Answer»

Concentrated sulphuric acid is a good drying agent. Can you tell why concentrated $H_{2} S O_{4}$ is not used to dry ammonia?

Discussion

6300.	the reaction of dimethyl sulphoxide with acetophenone in presence of hbr gives
Answer» the reaction of dimethyl sulphoxide with acetophenone in presence of hbr gives

Discussion

Explore topic-wise InterviewSolutions in .

The number of types of bonds between two carbonatoms in calcium carbide is :- (1) One sigma, two pi (2) One sigma, one pi (3) Two sigma, one pi (4) Two sigma, two pi

If a letter of English alphabet is chosen at random, then the probability that the letter is a consonant is:

The atom of an element has electronic configuration 2, 8, 8, 2.(a) What is the atomic number of the element?(b) To which of the following elements would it be chemically similar? (Atomic numbers of elements are given in brackets) He (2); O (8); Mg (12); K (19)​Give reason for your choice.

Non metallic oxides are ______ in nature.

Write the electronic configuration of the elements with atomic number 13, 14 and 15.

Molar mass is the mass (in grams) of how many moles of a substance?

How you can behave as an active citizen and help in reduction in waste generation? [3 MARKS]

What is limiting reagent? Explain with example.

Which of the following contains maximum no. of molecules?

How will you differentiate that whether the given gas is ethane or ethene?

Differentiate between: Detergents and soaps

n - hexane and n - heptane, when passed through Cr2O3 supported over alumina at 6000 C respectively give

Which of the following substance gets liberated at the anode during the electrolysis of aqueous NaCl?

Describe one reaction of ethanol.

Does ethanone exist? How does its structure look like

Alkanes readily burn in excess of air or Oxygen to give

calculate percentage of carbon in ethanol (c2h5OH

(a) How were the positions of isotopes of an element decided in the modern periodic table ? (b) How were the positions of cobalt and nickel resolved in the modern periodic table ? (c) Where should hydrogen be placed in the modern periodic table ? Give reason for your answer.

What is a functional group in a carbon compound? Identify the functional group present in CH3COOH and C2H5OH.

Which is the correct structure of compound 1-Methoxy-2-(2-methoxy ethoxy)ethane?

25. Give reason: (A)white silver chloride turns grey in sunlight (B)why digestion is as decomposition reaction (B)why are the bags of Potato chips usually flushed with nitrogen gas (D)why does coppervessels lose their shine when exposed with air

an oxide of metal have 20% oxygen , the equivalent weight of oxide is

The standard reduction potentials at 250 C of Li+ /Li , Ba2+ /Ba , Na+ /Na and Mg2+ /Mg are -3.05 , -2.73 , -2.71 and -2.37 volt respectively. Which one of the following is the strongest oxidizing agent?

Consider the reaction A → B. Which of the following defines the rate of this reaction?

If A2+ has same L. E as that of Na+ and B2- has same L. E as that of Cl-. If the L. E of NaCl is X. Then find for AB.

the first excited state of Cl^- ion will have degeneracy of

What mass of iron will be obtained in pure state from 100kg of an iron ore containing 90% FeO

What pH values can a universal indicator detect?

Can an organic compound having a formula CnHn is possible.give reasons to justify your answer.

What happens when dilute hydrochloric acid is added to lead nitrate solution?

What will happen if deer is missing in the food chain given below? Grass→Deer→Tiger→ (a) The population of tigers increases (b) The population of grass decreases (c) Tigers will start eating grass (d) The population of tigers decreases and the population of grass increases.

Consider the given system in equilibrium: 2SO2(g)+O2(g)⇋2SO3(g)+heat What effect will addition of vanadium pentoxide have on the given equilibrium system?

What will be the product of the given reaction?

explain redox reaction in brief

The series of carbon compounds in which two successive compounds differ by –CH2 unit is called ___ .

Why acids are sour in taste and bases are bitter in taste?

Mendeleev's contributions to the concept of the periodic table laid the foundation for the Modern Periodic Table. Give reasons

White silver chloride in sunlight turns to

87.An electrolysed cell is composed of Cu and Zn. A current of 9.65A is drawn from a cell for 1 hour.Then the loss in mass at anode and gain in mass at cathode, respectively could be

A gas mixture contains 50% helium and 50% methane by volume at STP. What is the percentage by mass of methane in the mixture? 1. 20% 2. 40% 3. 60% 4. 80

Which of the following acid has the highest concentration of H+ ions?

why ammonia and phosphine has much difference in bond angle

Find out ratio of enrgy of second excited state of hydrogen to third excited state of helium.

Which of these metals do not react with dilute acids?

Which of the following methods can be used for preventing corrosion?

Concentrated sulphuric acid is a good drying agent. Can you tell why concentrated H2SO4 is not used to dry ammonia?

the reaction of dimethyl sulphoxide with acetophenone in presence of hbr gives

The atom of an element has electronic configuration 2, 8, 8, 2.(a) What is the atomic number of the element?(b) To which of the following elements would it be chemically similar? (Atomic numbers of elements are given in brackets) He (2); O (8); Mg (12); K (19)Give reason for your choice.