15280 + Interview Questions in Chemistry Page 19 InterviewSolution

901.	Who developed the long form of periodic table?
Answer» Who developed the long form of periodic table?

901.

Who developed the long form of periodic table?

Answer»

Who developed the long form of periodic table?

Discussion

902.	State whether the following statement is true or false : Only 10 percent of the light energy given by the sun is available for transfer at each higher trophic level in a food chain.
Answer» State whether the following statement is true or false : Only 10 percent of the light energy given by the sun is available for transfer at each higher trophic level in a food chain.

902.

State whether the following statement is true or false : Only 10 percent of the light energy given by the sun is available for transfer at each higher trophic level in a food chain.

Answer»

State whether the following statement is true or false :

Only 10 percent of the light energy given by the sun is available for transfer at each higher trophic level in a food chain.

Discussion

903.	State and explain the reactions , if any, of the following metals with a solution of copper sulphate: (a) Gold (b) Copper (c) Zinc (d) Mercury
Answer» State and explain the reactions , if any, of the following metals with a solution of copper sulphate: (a) Gold (b) Copper (c) Zinc (d) Mercury

903.

State and explain the reactions , if any, of the following metals with a solution of copper sulphate: (a) Gold (b) Copper (c) Zinc (d) Mercury

Answer»

State and explain the reactions , if any, of the following metals with a solution of copper sulphate:
(a) Gold

(b) Copper

(c) Zinc

(d) Mercury

Discussion

904.	What is the formula of perfect numbers
Answer» What is the formula of perfect numbers

Discussion

905.	Which type of reaction is this ? CuCO3 + H2SO4 -----------> CuSO4 + H2O
Answer» Which type of reaction is this ? CuCO3 + H2SO4 -----------> CuSO4 + H2O

Discussion

906.	A chloride of alkaline earth metal dissolves appreciably in cold water when placed on a platinum wire in Bunsen flame, no distinctive color is noticed. The cation of chloride is:
Answer» A chloride of alkaline earth metal dissolves appreciably in cold water when placed on a platinum wire in Bunsen flame, no distinctive color is noticed. The cation of chloride is:

Discussion

907.	ntwhen heating PCl5 then it decomposes PCl3 and Cl2 in form of gas the vapour density of gas it mixture is 70.2 and 57.9 at 200^°c and 250^°c the degree of dissociation of pcl5 at 200^°c and 250^°c is.n
Answer» ntwhen heating PCl5 then it decomposes PCl3 and Cl2 in form of gas the vapour density of gas it mixture is 70.2 and 57.9 at 200^°c and 250^°c the degree of dissociation of pcl5 at 200^°c and 250^°c is.n

Discussion

908.	Question 9 (b)Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below:Write a balanced chemical equation for the reaction taking place.
Answer» Question 9 (b) Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below: Write a balanced chemical equation for the reaction taking place.

908.

Question 9 (b)Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below:Write a balanced chemical equation for the reaction taking place.

Answer»

Question 9 (b)

Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below:

Write a balanced chemical equation for the reaction taking place.

Discussion

909.	Why size of noble gas is greater than that of halogen
Answer» Why size of noble gas is greater than that of halogen

Discussion

910.	Two moles of gas A2 are mixed with two moles ofgas B2 in a flask of volume 1 lit. If at equilibrium0.5 moles of A2 are obtained. Then find out Kp for reaction A2(g) +B2(g)→2AB(g) (1) 12 (2) (3) 4 (4) 36
Answer» Two moles of gas A2 are mixed with two moles ofgas B2 in a flask of volume 1 lit. If at equilibrium0.5 moles of A2 are obtained. Then find out Kp for reaction A2(g) +B2(g)→2AB(g) (1) 12 (2) (3) 4 (4) 36

Discussion

911.	One mole of Nitrogen gas at 0.8 atm takes 38 second to diffuse through a pin hole whereas one mole of an unknown compound of Xenon with fluorine at 1.6 atm takes 56.26 second to diffuse through the same hole, then the molecular formula of the compound is 1) XeF4 2) XeF2 3) XeF6 4) XeF5
Answer» One mole of Nitrogen gas at 0.8 atm takes 38 second to diffuse through a pin hole whereas one mole of an unknown compound of Xenon with fluorine at 1.6 atm takes 56.26 second to diffuse through the same hole, then the molecular formula of the compound is 1) XeF4 2) XeF2 3) XeF6 4) XeF5

Discussion

912.	What is pH?
Answer» What is pH?

Discussion

913.	When a student added universal indicator solution to one of the following chemicals, its colour changed to navy blue. The chemical is most likely to be :(1) lemon juice(2) milk of magnesia (3) vinegar(4) tomato juice
Answer» When a student added universal indicator solution to one of the following chemicals, its colour changed to navy blue. The chemical is most likely to be : (1) lemon juice (2) milk of magnesia (3) vinegar (4) tomato juice

Discussion

914.	how does acidic nature of hydrides vary along the period and down the group ? if there are any exceptions kindly point them and explain them
Answer» how does acidic nature of hydrides vary along the period and down the group ? if there are any exceptions kindly point them and explain them

Discussion

915.	Question 62(i) Given below are the steps for extraction of copper from its ore. Write the reaction involved.(a) Roasting of copper (I) sulphide.(b) Reduction of copper (I) oxide with copper (I) sulphide.(c) Electrolytic refining.(ii) Draw a neat and well-labelled diagram for electrolytic refining of copper.
Answer» Question 62 (i) Given below are the steps for extraction of copper from its ore. Write the reaction involved. (a) Roasting of copper (I) sulphide. (b) Reduction of copper (I) oxide with copper (I) sulphide. (c) Electrolytic refining. (ii) Draw a neat and well-labelled diagram for electrolytic refining of copper.

Discussion

916.	Which of the following ammonium salt is not used on heating with alkalis to give ammonia?
Answer» Which of the following ammonium salt is not used on heating with alkalis to give ammonia?

Discussion

917.	The compound CH3−CH2−O−CH2−CH3 belongs to the family of
Answer» The compound $C H_{3} - C H_{2} - O - C H_{2} - C H_{3}$ belongs to the family of

Discussion

918.	n factor of water (H2O) is
Answer» n factor of water (H2O) is

Discussion

919.	9.A mixture of ideal gases has 2 moles of He,4 moles of oxygen and 1 mole of ozone at absolute temperature T.find internal energy of mixture.
Answer» 9.A mixture of ideal gases has 2 moles of He,4 moles of oxygen and 1 mole of ozone at absolute temperature T.find internal energy of mixture.

Discussion

920.	Column AColumn B1C−4 is highly unstable becauseAIt would be difficult for carbon with six protons in its nucleus to hold on just two electrons.2C+4 is achieved byBGaining 4 electrons to its outermost orbit3C+4 is highly unstable becauseCLoosing 4 valence electrons4C−4 is achieved byDIt is difficult for the nucleus with six protons to hold on ten electrons, i.e. four extra electrons
Answer» $\begin{matrix} C o l u m n A & C o l u m n B 1 & C^{- 4} i s h i g h l y u n s t a b l e b e c a u s e & A & I t w o u l d b e d i f f i c u l t f o r c a r b o n w i t h s i x p r o t o n s i n i t s n u c l e u s t o h o l d o n j u s t t w o e l e c t r o n s . 2 & C^{+ 4} i s a c h i e v e d b y & B & G a i n i n g 4 e l e c t r o n s t o i t s o u t e r m o s t o r b i t 3 & C^{+ 4} i s h i g h l y u n s t a b l e b e c a u s e & C & L o o s i n g 4 v a l e n c e e l e c t r o n s 4 & C^{- 4} i s a c h i e v e d b y & D & I t i s d i f f i c u l t f o r t h e n u c l e u s w i t h s i x p r o t o n s t o h o l d o n t e n e l e c t r o n s, i . e . f o u r e x t r a e l e c t r o n s \end{matrix}$

Discussion

921.	Which process is used to reduce roasted metallic oxide to metal in molten conditions?
Answer» Which process is used to reduce roasted metallic oxide to metal in molten conditions?

Discussion

922.	(a) What is a soap? Name one soap.(b) Describe the structure of a soap molecule with the help of a diagram.(c) Explain the cleansing action of soap. Draw diagrams to illustrate your answer.(d) Give the main differences between soaps and detergents.
Answer» (a) What is a soap? Name one soap. (b) Describe the structure of a soap molecule with the help of a diagram. (c) Explain the cleansing action of soap. Draw diagrams to illustrate your answer. (d) Give the main differences between soaps and detergents.

Discussion

923.	Why does the colour of copper sulphate solution changes when iron nail is dipped in it?
Answer» Why does the colour of copper sulphate solution changes when iron nail is dipped in it?

Discussion

924.	A metal 'M' is found in nature as its carbonate. It is used in the galvanization of iron. Identify 'M' and name its ore. How will you convert this ore into free metal ?
Answer» A metal 'M' is found in nature as its carbonate. It is used in the galvanization of iron. Identify 'M' and name its ore. How will you convert this ore into free metal ?

Discussion

925.	Define A)Atom B)Elements C)Compound
Answer» Define A)Atom B)Elements C)Compound

Discussion

926.	How many isomeric alcohols and ethers are possible with the molecular formula C4H10O?
Answer» How many isomeric alcohols and ethers are possible with the molecular formula C4H10O?

Discussion

927.	Name three electrical devices where the heating effect of current is used.What do these heating devices contain for heat production?
Answer» Name three electrical devices where the heating effect of current is used.What do these heating devices contain for heat production?

Discussion

928.	What is the difference between atomic weight and atomic mass unit i.e., amu.
Answer» What is the difference between atomic weight and atomic mass unit i.e., amu.

Discussion

929.	Question 25 (i)Is the following argument correct? Give reasons for your answer.If two coins are tossed simultaneously there are three possible outcomes – two heads, two tails or one of each. Therefore, for each of these outcomes, the probability is 13.
Answer» Question 25 (i) Is the following argument correct? Give reasons for your answer. If two coins are tossed simultaneously there are three possible outcomes – two heads, two tails or one of each. Therefore, for each of these outcomes, the probability is $\frac{1}{3}$ .

Discussion

930.	PhCH=CHCHO+CH3CH=CHCHObase−−−−−→EtOH,Δ(A)87% ; Product of this reaction is :
Answer» $P h C H = C H C H O + C H_{3} C H = C H C H O base - ---- \to E t O H, Δ (A) 87 %$ ; Product of this reaction is :

Discussion

931.	Not all bases are alkalis. Give the reason
Answer» Not all bases are alkalis. Give the reason

Discussion

932.	If we compare MgCl_2 and AlCl_3 , ionic character for Al is more than Mg, and covalent character also for Al IS MORE THAN Mg. How this justified ??
Answer» If we compare MgCl_2 and AlCl_3 , ionic character for Al is more than Mg, and covalent character also for Al IS MORE THAN Mg. How this justified ??

Discussion

933.	how and why does ph of a solution depends upon temperature
Answer» how and why does ph of a solution depends upon temperature

Discussion

934.	If the concentration of hydronium ions in a solution is 10−4 M, then the pH of this solution is:4
Answer» If the concentration of hydronium ions in a solution is $10^{- 4} M$ , then the pH of this solution is: 4

Discussion

935.	Tick the odd one out.1. douze, vingt, mois, trois2. carotte, pomme, banane, pêche3. aimer, regarder, avoir, parler4. chien, oiseau, tortue, souris5. est, sont, ont, êtes
Answer» Tick the odd one out. 1. douze, vingt, mois, trois 2. carotte, pomme, banane, pêche 3. aimer, regarder, avoir, parler 4. chien, oiseau, tortue, souris 5. est, sont, ont, êtes

Discussion

936.	Which of the following gas is released during the reaction of aluminium with hot and concentrated sulphuric acid?
Answer» Which of the following gas is released during the reaction of aluminium with hot and concentrated sulphuric acid?

Discussion

937.	(a) What happens when an acid reacts with a metal? Give the chemical equation of the reaction involved. (b) Which gas is usually liberated when an acid reacts with a metal? How will you test for the presence of this gas?
Answer» (a) What happens when an acid reacts with a metal? Give the chemical equation of the reaction involved. (b) Which gas is usually liberated when an acid reacts with a metal? How will you test for the presence of this gas?

937.

(a) What happens when an acid reacts with a metal? Give the chemical equation of the reaction involved. (b) Which gas is usually liberated when an acid reacts with a metal? How will you test for the presence of this gas?

Answer»

(a) What happens when an acid reacts with a metal? Give the chemical equation of the reaction involved.

(b) Which gas is usually liberated when an acid reacts with a metal? How will you test for the presence of this gas?

Discussion

938.	xample, anZn, 4s and 3d e experience different effective nuclear charge4s, σ 10 x 1.0 + 18 x 0.85 + 1 x 0.35 25.65For eZ 30-25.65 4.353d, σ-181.0 + 9 x 0.35-21.15Z 30-21.15 8.85
Answer» xample, anZn, 4s and 3d e experience different effective nuclear charge4s, σ 10 x 1.0 + 18 x 0.85 + 1 x 0.35 25.65For eZ 30-25.65 4.353d, σ-181.0 + 9 x 0.35-21.15Z 30-21.15 8.85

Discussion

939.	Question 11What type of oxides are formed when non-metals combine with oxygen?
Answer» Question 11 What type of oxides are formed when non-metals combine with oxygen?

Discussion

940.	The correct equation for the laboratory preparation of nitric acid from potassium nitrate and concentrated sulphuric acid is
Answer» The correct equation for the laboratory preparation of nitric acid from potassium nitrate and concentrated sulphuric acid is

Discussion

941.	Name the scientist who developed the pH scale?
Answer» Name the scientist who developed the pH scale?

Discussion

942.	60. I'm not to make out , How to form Lewis dot structure ( how sharing will take place and how to arrange electrons) ?
Answer» 60. I'm not to make out , How to form Lewis dot structure ( how sharing will take place and how to arrange electrons) ?

Discussion

943.	One mole of chloride combines with a certain weight of a metal giving 111g of its chloride. Same amount of metal can displace 2g of hydrogen from an acid. What is the atomic weight of metal?
Answer» One mole of chloride combines with a certain weight of a metal giving 111g of its chloride. Same amount of metal can displace 2g of hydrogen from an acid. What is the atomic weight of metal?

Discussion

944.	How many valence electrons are present in (a) metals, and (b) non-metals?
Answer» How many valence electrons are present in (a) metals, and (b) non-metals?

Discussion

945.	Correct the following statement:Lead bromide conducts electricity.
Answer» Correct the following statement: Lead bromide conducts electricity.

Discussion

946.	The oxide of non-metal which is neutral is:
Answer» The oxide of non-metal which is neutral is:

Discussion

947.	All Nitrates on being heated
Answer» All Nitrates on being heated

Discussion

948.	18. If the rate constants of a reaction are found to be K1and K2at300K and 280K respectively, then which of the following would be the correct? 1. K2=4K1 2. K1=4K2 3. K2=2K1 4. K2=0.5K1
Answer» 18. If the rate constants of a reaction are found to be K1and K2at300K and 280K respectively, then which of the following would be the correct? 1. K2=4K1 2. K1=4K2 3. K2=2K1 4. K2=0.5K1

Discussion

949.	The vapour density of a mixture containing No_2 and N_2o_{4 } is 27.6. The mole fraction of N_2o_4 in the mixture is:
Answer» The vapour density of a mixture containing No_2 and N_2o_{4 } is 27.6. The mole fraction of N_2o_4 in the mixture is:

Discussion

950.	PH of our tooth paste is ?
Answer» PH of our tooth paste is ?

Discussion

Explore topic-wise InterviewSolutions in .

Who developed the long form of periodic table?

State whether the following statement is true or false : Only 10 percent of the light energy given by the sun is available for transfer at each higher trophic level in a food chain.

State and explain the reactions , if any, of the following metals with a solution of copper sulphate: (a) Gold (b) Copper (c) Zinc (d) Mercury

What is the formula of perfect numbers

Which type of reaction is this ? CuCO3 + H2SO4 -----------> CuSO4 + H2O

A chloride of alkaline earth metal dissolves appreciably in cold water when placed on a platinum wire in Bunsen flame, no distinctive color is noticed. The cation of chloride is:

ntwhen heating PCl5 then it decomposes PCl3 and Cl2 in form of gas the vapour density of gas it mixture is 70.2 and 57.9 at 200^°c and 250^°c the degree of dissociation of pcl5 at 200^°c and 250^°c is.n

Question 9 (b)Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below:Write a balanced chemical equation for the reaction taking place.

Why size of noble gas is greater than that of halogen

Two moles of gas A2 are mixed with two moles ofgas B2 in a flask of volume 1 lit. If at equilibrium0.5 moles of A2 are obtained. Then find out Kp for reaction A2(g) +B2(g)→2AB(g) (1) 12 (2) (3) 4 (4) 36

One mole of Nitrogen gas at 0.8 atm takes 38 second to diffuse through a pin hole whereas one mole of an unknown compound of Xenon with fluorine at 1.6 atm takes 56.26 second to diffuse through the same hole, then the molecular formula of the compound is 1) XeF4 2) XeF2 3) XeF6 4) XeF5

What is pH?

When a student added universal indicator solution to one of the following chemicals, its colour changed to navy blue. The chemical is most likely to be :(1) lemon juice(2) milk of magnesia (3) vinegar(4) tomato juice

how does acidic nature of hydrides vary along the period and down the group ? if there are any exceptions kindly point them and explain them

Which of the following ammonium salt is not used on heating with alkalis to give ammonia?

The compound CH3−CH2−O−CH2−CH3 belongs to the family of

n factor of water (H2O) is

9.A mixture of ideal gases has 2 moles of He,4 moles of oxygen and 1 mole of ozone at absolute temperature T.find internal energy of mixture.

Which process is used to reduce roasted metallic oxide to metal in molten conditions?

(a) What is a soap? Name one soap.(b) Describe the structure of a soap molecule with the help of a diagram.(c) Explain the cleansing action of soap. Draw diagrams to illustrate your answer.​(d) Give the main differences between soaps and detergents.

Why does the colour of copper sulphate solution changes when iron nail is dipped in it?

A metal 'M' is found in nature as its carbonate. It is used in the galvanization of iron. Identify 'M' and name its ore. How will you convert this ore into free metal ?

Define A)Atom B)Elements C)Compound

How many isomeric alcohols and ethers are possible with the molecular formula C4H10O?

Name three electrical devices where the heating effect of current is used.What do these heating devices contain for heat production?

What is the difference between atomic weight and atomic mass unit i.e., amu.

Question 25 (i)Is the following argument correct? Give reasons for your answer.If two coins are tossed simultaneously there are three possible outcomes – two heads, two tails or one of each. Therefore, for each of these outcomes, the probability is 13.

PhCH=CHCHO+CH3CH=CHCHObase−−−−−→EtOH,Δ(A)87% ; Product of this reaction is :

Not all bases are alkalis. Give the reason

If we compare MgCl_2 and AlCl_3 , ionic character for Al is more than Mg, and covalent character also for Al IS MORE THAN Mg. How this justified ??

how and why does ph of a solution depends upon temperature

If the concentration of hydronium ions in a solution is 10−4 M, then the pH of this solution is:4

Tick the odd one out.1. douze, vingt, mois, trois2. carotte, pomme, banane, pêche3. aimer, regarder, avoir, parler4. chien, oiseau, tortue, souris5. est, sont, ont, êtes

Which of the following gas is released during the reaction of aluminium with hot and concentrated sulphuric acid?

(a) What happens when an acid reacts with a metal? Give the chemical equation of the reaction involved. (b) Which gas is usually liberated when an acid reacts with a metal? How will you test for the presence of this gas?

xample, anZn, 4s and 3d e experience different effective nuclear charge4s, σ 10 x 1.0 + 18 x 0.85 + 1 x 0.35 25.65For eZ 30-25.65 4.353d, σ-181.0 + 9 x 0.35-21.15Z 30-21.15 8.85

Question 11What type of oxides are formed when non-metals combine with oxygen?

The correct equation for the laboratory preparation of nitric acid from potassium nitrate and concentrated sulphuric acid is

Name the scientist who developed the pH scale?

60. I'm not to make out , How to form Lewis dot structure ( how sharing will take place and how to arrange electrons) ?

One mole of chloride combines with a certain weight of a metal giving 111g of its chloride. Same amount of metal can displace 2g of hydrogen from an acid. What is the atomic weight of metal?

How many valence electrons are present in (a) metals, and (b) non-metals?

Correct the following statement:Lead bromide conducts electricity.

The oxide of non-metal which is neutral is:

All Nitrates on being heated

18. If the rate constants of a reaction are found to be K1and K2at300K and 280K respectively, then which of the following would be the correct? 1. K2=4*K1 2. K1=4*K2 3. K2=2*K1 4. K2=0.5*K1

The vapour density of a mixture containing No_2 and N_2o_{4 } is 27.6. The mole fraction of N_2o_4 in the mixture is:

PH of our tooth paste is ?

(a) What is a soap? Name one soap.(b) Describe the structure of a soap molecule with the help of a diagram.(c) Explain the cleansing action of soap. Draw diagrams to illustrate your answer.(d) Give the main differences between soaps and detergents.

18. If the rate constants of a reaction are found to be K1and K2at300K and 280K respectively, then which of the following would be the correct? 1. K2=4K1 2. K1=4K2 3. K2=2K1 4. K2=0.5K1