7248 + Interview Questions in Chemistry Page 39 InterviewSolution

1901.	Why should we increase pressure if we want to make a super saturated solution?
Answer» Why should we increase pressure if we want to make a super saturated solution?

Discussion

1902.	What is the molecular formula of bleaching powder CaOCl_{2 }or Ca(OCl)_2
Answer» What is the molecular formula of bleaching powder CaOCl_{2 }or Ca(OCl)_2

Discussion

1903.	People usually keep Angethi/burning coal in their closed rooms during winter season. Why is it advised to keep the door open?
Answer» People usually keep Angethi/burning coal in their closed rooms during winter season. Why is it advised to keep the door open?

Discussion

1904.	Acids are _____ in taste.
Answer» Acids are _____ in taste.

Discussion

1905.	If one mole of a strong acid reacts with one mole ofa strong base, the heat produced is always the same.Why?
Answer» If one mole of a strong acid reacts with one mole ofa strong base, the heat produced is always the same.Why?

Discussion

1906.	Evaporation and boiling differ by
Answer» Evaporation and boiling differ by

Discussion

1907.	what is bose einstine condenstat
Answer» what is bose einstine condenstat

Discussion

1908.	Identify the conclusions from Rutherford's alpha ray scattering experiment.
Answer» Identify the conclusions from Rutherford's alpha ray scattering experiment.

Discussion

1909.	Which of the following expressions is correct for zero order and first order respectively (where a is initial concentration)
Answer» Which of the following expressions is correct for zero order and first order respectively (where $a$ is initial concentration)

Discussion

1910.	What product obtained on burning fossil fuels can prevent oxygen from binding with haemoglobin?
Answer» What product obtained on burning fossil fuels can prevent oxygen from binding with haemoglobin?

Discussion

1911.	Which of the following hydrated ions has the smallest size? 1 Cs+ 2 Rb+ 3 Na+ 4 K+
Answer» Which of the following hydrated ions has the smallest size? 1 Cs+ 2 Rb+ 3 Na+ 4 K+

Discussion

1912.	A sample of drinking water was found to be severely contaminated with chloroform,CHCl, supposed to be carcinogenic in nature. The level of contamination was 15ppm (by mass).() Express this in percent by mass.lii) Determine the molality of chloroform in the water sample.
Answer» A sample of drinking water was found to be severely contaminated with chloroform,CHCl, supposed to be carcinogenic in nature. The level of contamination was 15ppm (by mass).() Express this in percent by mass.lii) Determine the molality of chloroform in the water sample.

Discussion

1913.	32.3The number of moles of oxygen in one litre of air containing 21% oxygen by volume, under standard condition,is (1)0.0093 moles (2)2.10 moles (3)0.186mole (4)0.21mole
Answer» 32.3The number of moles of oxygen in one litre of air containing 21% oxygen by volume, under standard condition,is (1)0.0093 moles (2)2.10 moles (3)0.186mole (4)0.21mole

Discussion

1914.	What does a chemical formula represent?
Answer» What does a chemical formula represent?

Discussion

1915.	Question 10 State two ways to prevent the rusting of iron.
Answer» Question 10 State two ways to prevent the rusting of iron.

Discussion

1916.	Which sub-atomic particle have no charge?
Answer» Which sub-atomic particle have no charge?

Discussion

1917.	Why is the incident ray parallel to the emergent ray ??
Answer» Why is the incident ray parallel to the emergent ray ??

Discussion

1918.	why Na_2O_2 has greater bond length than H_2O_2 . explain in detail
Answer» why Na_2O_2 has greater bond length than H_2O_2 . explain in detail

Discussion

1919.	The same proportion of hydrogen and oxygen in the water obtained from different sources proves the law of:
Answer» The same proportion of hydrogen and oxygen in the water obtained from different sources proves the law of:

Discussion

1920.	The number of silicon atoms per m3 is 5 × 1028. This is doped simultaneously with 5 ×1022 atoms per m3 of Arsenic and 5 × 1020 per m3 atoms of Indium. Calculate the number of electrons and holes. Given that ni= 1.5 × 1016 m−3. Is the material n-type or p-type?
Answer» The number of silicon atoms per m3 is 5 × 1028. This is doped simultaneously with 5 ×1022 atoms per m3 of Arsenic and 5 × 1020 per m3 atoms of Indium. Calculate the number of electrons and holes. Given that ni= 1.5 × 1016 m−3. Is the material n-type or p-type?

Discussion

1921.	(a) Describe the formation of coal. (b) Name four types of coal with the percentage of carbon present in each.
Answer» (a) Describe the formation of coal. (b) Name four types of coal with the percentage of carbon present in each.

1921.

(a) Describe the formation of coal. (b) Name four types of coal with the percentage of carbon present in each.

Answer»

(a) Describe the formation of coal.

(b) Name four types of coal with the percentage of carbon present in each.

Discussion

1922.	Which of the following statements is wrong?
Answer» Which of the following statements is wrong?

Discussion

1923.	why a chemical equation should be balanced ?
Answer» why a chemical equation should be balanced ?

Discussion

1924.	51. Water and chlorobenzene are immiscible liquids. Their mixture boils at 89^° c under a reduced pressure of 7.7×10000 pa .The vapour pressure of pure water at 89℃ 7×10000 pa. weight percentage of chlorobenzene in distillate is
Answer» 51. Water and chlorobenzene are immiscible liquids. Their mixture boils at 89^° c under a reduced pressure of 7.7×10000 pa .The vapour pressure of pure water at 89℃ 7×10000 pa. weight percentage of chlorobenzene in distillate is

Discussion

1925.	Match the terms of column A correctly with the phrases given in column B. A B(i)Polyester(a)Prepared by using wood pulp(ii)Teflon(b)Used for making parachutes and stockings(iii)Rayon(c)Used to make non−stick cookware(iv)Nylon(d)Fabrics do not wrinkle easily
Answer» Match the terms of column A correctly with the phrases given in column B. $\begin{matrix} A & B (i) & P o l y e s t e r & (a) & P r e p a r e d b y u s i n g w o o d p u l p (i i) & T e f l o n & (b) & U s e d f o r m a k i n g p a r a c h u t e s a n d s t o c k i n g s (i i i) & R a y o n & (c) & U s e d t o m a k e n o n - s t i c k c o o k w a r e (i v) & N y l o n & (d) & F a b r i c s d o n o t w r i n k l e e a s i l y \end{matrix}$

1925.

Match the terms of column A correctly with the phrases given in column B. A B(i)Polyester(a)Prepared by using wood pulp(ii)Teflon(b)Used for making parachutes and stockings(iii)Rayon(c)Used to make non−stick cookware(iv)Nylon(d)Fabrics do not wrinkle easily

Answer»

Match the terms of column A correctly with the phrases given in column B.

$\begin{matrix} A & B (i) & P o l y e s t e r & (a) & P r e p a r e d b y u s i n g w o o d p u l p (i i) & T e f l o n & (b) & U s e d f o r m a k i n g p a r a c h u t e s a n d s t o c k i n g s (i i i) & R a y o n & (c) & U s e d t o m a k e n o n - s t i c k c o o k w a r e (i v) & N y l o n & (d) & F a b r i c s d o n o t w r i n k l e e a s i l y \end{matrix}$

Discussion

1926.	Question 9Which of the following procedures will give you water free from all impurities?(a) Adding chlorine tablets(b) Distillation(c) Boiling(d) Filtration
Answer» Question 9 Which of the following procedures will give you water free from all impurities? (a) Adding chlorine tablets (b) Distillation (c) Boiling (d) Filtration

Discussion

1927.	Metallic carbonate combined with tartarates creates a birthday moment memorable. Could you identify that?
Answer» Metallic carbonate combined with tartarates creates a birthday moment memorable. Could you identify that?

Discussion

1928.	Name any four gaseous pollutants.
Answer» Name any four gaseous pollutants.

Discussion

1929.	Balance oxidation no.method and highlight the CROSS MULTIPLICATION PART { As }}_2S_3+NO_3^-→ AsO_4^{3-}+NO+S (IN ACIDI MEDIUM)
Answer» Balance oxidation no.method and highlight the CROSS MULTIPLICATION PART { As }}_2S_3+NO_3^-→ AsO_4^{3-}+NO+S (IN ACIDI MEDIUM)

Discussion

1930.	To make pvc a flexible plastic the additive used is called?
Answer» To make pvc a flexible plastic the additive used is called?

Discussion

1931.	The energy released during burning of coal, oil, etc. is called
Answer» The energy released during burning of coal, oil, etc. is called

Discussion

1932.	The following reaction is an example of a2Pb(NO3)2(s)Heat−−−→2PbO(s)+4NO2(g)+O2(g)I. Combination reaction II. Decomposition reactionIII. Endothermic reactionIV. Exothermic reaction
Answer» The following reaction is an example of a $2 P b (N O_{3})_{2} (s) H e a t - -- \to 2 P b O (s) + 4 N O_{2} (g) + O_{2} (g)$ I. Combination reaction II. Decomposition reaction III. Endothermic reaction IV. Exothermic reaction

Discussion

1933.	Nitrogen + oxygen → nitrogen dioxide:What type of reaction is this?
Answer» Nitrogen + oxygen → nitrogen dioxide: What type of reaction is this?

Discussion

1934.	39. H2O2 restores the colour of old lead paintings,blackened by the action of H2S gas by a) converting PbO2 to Pb b) oxidising PbS to PbSO4 c) converting PbCO3 to Pb d) oxidising to PbSO3 to PbSO4
Answer» 39. H2O2 restores the colour of old lead paintings,blackened by the action of H2S gas by a) converting PbO2 to Pb b) oxidising PbS to PbSO4 c) converting PbCO3 to Pb d) oxidising to PbSO3 to PbSO4

Discussion

1935.	Name two metals which are used for making cooking utensils and water boilers for factories.
Answer» Name two metals which are used for making cooking utensils and water boilers for factories.

Discussion

1936.	Give reason for the following observation :The smell of hot sizzling food reaches us even from a considerable distace but to get the smell from cold food, we have to close to it.
Answer» Give reason for the following observation : The smell of hot sizzling food reaches us even from a considerable distace but to get the smell from cold food, we have to close to it.

Discussion

1937.	Which of the following is a ferrous alloy?
Answer» Which of the following is a ferrous alloy?

Discussion

1938.	Firefighters' uniform is coated with a plastic that is fire resistant. Identify the plastic from the given options.
Answer» Firefighters' uniform is coated with a plastic that is fire resistant. Identify the plastic from the given options.

Discussion

1939.	25L of H2 gas diffuses through a porous partition in 40 seconds. Volume of O2 gas diffusing under similar conditions in 20 seconds will be
Answer» 25L of H2 gas diffuses through a porous partition in 40 seconds. Volume of O2 gas diffusing under similar conditions in 20 seconds will be

Discussion

1940.	H2(g)+V2O5(s)→V2O3(s)+H2O(l) Let the coefficients for the given reaction be as follows: (A)H2(g)+(B)V2O5(s)→(C)V2O3(s)+(D)H2O(l) What will be the equations for the number of atoms for each element, so that each is balanced?
Answer» $H_{2} (g) + V_{2} O_{5} (s) \to V_{2} O_{3} (s) + H_{2} O (l)$ Let the coefficients for the given reaction be as follows: $(A) H_{2} (g) + (B) V_{2} O_{5} (s) \to (C) V_{2} O_{3} (s) + (D) H_{2} O (l)$ What will be the equations for the number of atoms for each element, so that each is balanced?

Discussion

1941.	Question 22 (i)Fill in the blanks(i) A polymer is a chain of many small units joined together which are called ___.
Answer» Question 22 (i) Fill in the blanks (i) A polymer is a chain of many small units joined together which are called ___.

Discussion

1942.	Water works as a fire extinguisher by removing
Answer» Water works as a fire extinguisher by removing

Discussion

1943.	___ and platinum are metals which do not get rust.
Answer» ___ and platinum are metals which do not get rust.

Discussion

1944.	How do solids, liquids and gases differ in shape and volume ?
Answer» How do solids, liquids and gases differ in shape and volume ?

Discussion

1945.	What is the function of potassium chlorate in a matchstick bulb?
Answer» What is the function of potassium chlorate in a matchstick bulb?

Discussion

1946.	Pthallic acid reacts with nh3 explain with mechanism
Answer» Pthallic acid reacts with nh3 explain with mechanism

Discussion

1947.	A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% ofoctahedral voids. The formula of the compound is :
Answer» A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% ofoctahedral voids. The formula of the compound is :

Discussion

1948.	calculate the volume of hydrogen released from 18 g of magnesium in the following reactionMg + 2HCl ====MgCl2 +H2 liberated
Answer» calculate the volume of hydrogen released from 18 g of magnesium in the following reaction Mg + 2HCl ====MgCl2 +H2 liberated

Discussion

1949.	What is conductors and insulators ? Why solid conduct heat better than liquids and gases?
Answer» What is conductors and insulators ? Why solid conduct heat better than liquids and gases?

Discussion

1950.	Question 3 Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is a non-metal? (a) iron nail (b) aluminium wire (c) copper plate (d) piece of coal
Answer» Question 3 Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is a non-metal? (a) iron nail (b) aluminium wire (c) copper plate (d) piece of coal

Discussion

Explore topic-wise InterviewSolutions in .

Why should we increase pressure if we want to make a super saturated solution?

What is the molecular formula of bleaching powder CaOCl_{2 }or Ca(OCl)_2

People usually keep Angethi/burning coal in their closed rooms during winter season. Why is it advised to keep the door open?

Acids are _____ in taste.

If one mole of a strong acid reacts with one mole ofa strong base, the heat produced is always the same.Why?

Evaporation and boiling differ by

what is bose einstine condenstat

Identify the conclusions from Rutherford's alpha ray scattering experiment.

Which of the following expressions is correct for zero order and first order respectively (where a is initial concentration)

What product obtained on burning fossil fuels can prevent oxygen from binding with haemoglobin?

Which of the following hydrated ions has the smallest size? 1 Cs+ 2 Rb+ 3 Na+ 4 K+

A sample of drinking water was found to be severely contaminated with chloroform,CHCl, supposed to be carcinogenic in nature. The level of contamination was 15ppm (by mass).() Express this in percent by mass.lii) Determine the molality of chloroform in the water sample.

32.3The number of moles of oxygen in one litre of air containing 21% oxygen by volume, under standard condition,is (1)0.0093 moles (2)2.10 moles (3)0.186mole (4)0.21mole

What does a chemical formula represent?

Question 10 State two ways to prevent the rusting of iron.

Which sub-atomic particle have no charge?

Why is the incident ray parallel to the emergent ray ??

why Na_2O_2 has greater bond length than H_2O_2 . explain in detail

The same proportion of hydrogen and oxygen in the water obtained from different sources proves the law of:

The number of silicon atoms per m3 is 5 × 1028. This is doped simultaneously with 5 ×1022 atoms per m3 of Arsenic and 5 × 1020 per m3 atoms of Indium. Calculate the number of electrons and holes. Given that ni= 1.5 × 1016 m−3. Is the material n-type or p-type?

(a) Describe the formation of coal. (b) Name four types of coal with the percentage of carbon present in each.

Which of the following statements is wrong?

why a chemical equation should be balanced ?

51. Water and chlorobenzene are immiscible liquids. Their mixture boils at 89^° c under a reduced pressure of 7.7×10000 pa .The vapour pressure of pure water at 89℃ 7×10000 pa. weight percentage of chlorobenzene in distillate is

Match the terms of column A correctly with the phrases given in column B. A B(i)Polyester(a)Prepared by using wood pulp(ii)Teflon(b)Used for making parachutes and stockings(iii)Rayon(c)Used to make non−stick cookware(iv)Nylon(d)Fabrics do not wrinkle easily

Question 9Which of the following procedures will give you water free from all impurities?(a) Adding chlorine tablets(b) Distillation(c) Boiling(d) Filtration

Metallic carbonate combined with tartarates creates a birthday moment memorable. Could you identify that?

Name any four gaseous pollutants.

Balance oxidation no.method and highlight the CROSS MULTIPLICATION PART { As }}_2S_3+NO_3^-→ AsO_4^{3-}+NO+S (IN ACIDI MEDIUM)

To make pvc a flexible plastic the additive used is called?

The energy released during burning of coal, oil, etc. is called

The following reaction is an example of a2Pb(NO3)2(s)Heat−−−→2PbO(s)+4NO2(g)+O2(g)I. Combination reaction II. Decomposition reactionIII. Endothermic reactionIV. Exothermic reaction

Nitrogen + oxygen → nitrogen dioxide:What type of reaction is this?

39. H2O2 restores the colour of old lead paintings,blackened by the action of H2S gas by a) converting PbO2 to Pb b) oxidising PbS to PbSO4 c) converting PbCO3 to Pb d) oxidising to PbSO3 to PbSO4

Name two metals which are used for making cooking utensils and water boilers for factories.

Give reason for the following observation :The smell of hot sizzling food reaches us even from a considerable distace but to get the smell from cold food, we have to close to it.

Which of the following is a ferrous alloy?

Firefighters' uniform is coated with a plastic that is fire resistant. Identify the plastic from the given options.

25L of H2 gas diffuses through a porous partition in 40 seconds. Volume of O2 gas diffusing under similar conditions in 20 seconds will be

H2(g)+V2O5(s)→V2O3(s)+H2O(l) Let the coefficients for the given reaction be as follows: (A)H2(g)+(B)V2O5(s)→(C)V2O3(s)+(D)H2O(l) What will be the equations for the number of atoms for each element, so that each is balanced?

Question 22 (i)Fill in the blanks(i) A polymer is a chain of many small units joined together which are called ___.

Water works as a fire extinguisher by removing

___ and platinum are metals which do not get rust.

How do solids, liquids and gases differ in shape and volume ?

What is the function of potassium chlorate in a matchstick bulb?

Pthallic acid reacts with nh3 explain with mechanism

A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% ofoctahedral voids. The formula of the compound is :

calculate the volume of hydrogen released from 18 g of magnesium in the following reactionMg + 2HCl ====MgCl2 +H2 liberated

What is conductors and insulators ? Why solid conduct heat better than liquids and gases?

Question 3 Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is a non-metal? (a) iron nail (b) aluminium wire (c) copper plate (d) piece of coal