10223 + Interview Questions in Chemistry Page 186 InterviewSolution

9251.	1st shell has 2 electrons 2nd one has 8 and so on. The 3rd shell has a place for 18 electrons. So will it have 18 electrons or just 8?
Answer» 1st shell has 2 electrons 2nd one has 8 and so on. The 3rd shell has a place for 18 electrons. So will it have 18 electrons or just 8?

Discussion

9252.	Why are lanthanides and actinides placed in two rows at the bottom of the periodic table?
Answer» Why are lanthanides and actinides placed in two rows at the bottom of the periodic table?

Discussion

9253.	What kind of mixture is air ? Give reasons.
Answer» What kind of mixture is air ? Give reasons.

Discussion

9254.	Explain the following giving examples a.saturated solution b. Pure substance c. Colloid d. Suspension
Answer» Explain the following giving examples a.saturated solution b. Pure substance c. Colloid d. Suspension

9254.

Explain the following giving examples a.saturated solution b. Pure substance c. Colloid d. Suspension

Answer»

Explain the following giving examples

a.saturated solution

b. Pure substance

c. Colloid

d. Suspension

Discussion

9255.	effect of change of temperature
Answer» effect of change of temperature

Discussion

9256.	Can we use technique of creating high pressure to convert evaporated acetone to acetone in liquid or solid state
Answer» Can we use technique of creating high pressure to convert evaporated acetone to acetone in liquid or solid state

Discussion

9257.	Give reasons isotopes of an element are chemically similar noble gases show least reactivity
Answer» Give reasons isotopes of an element are chemically similar noble gases show least reactivity

Discussion

9258.	How many molecules of K2CO3 are present in one mole? ( given atomic masses K=39u C=12u and O=16u)
Answer» How many molecules of K2CO3 are present in one mole? ( given atomic masses K=39u C=12u and O=16u)

Discussion

9259.	Why do solids have regular geometrical shape?
Answer» Why do solids have regular geometrical shape?

Discussion

9260.	You have one glass of water and some sugar and sand. How will you create a homogeneous mixture ?
Answer» You have one glass of water and some sugar and sand. How will you create a homogeneous mixture ?

Discussion

9261.	Does the temperature of liquid change during evaporation?
Answer» Does the temperature of liquid change during evaporation?

Discussion

9262.	The formula of sodium hydroxide is _______ .
Answer» The formula of sodium hydroxide is _______ .

Discussion

9263.	Which of the following cause maximum water pollution?
Answer» Which of the following cause maximum water pollution?

Discussion

9264.	Amongst the following, the total number of compounds whose aqueous solution turns red litmus paper blue is ___ KCN K2SO4 (NH4)2C2O4 NaCl Zn(NO3)2 FeCl3 K2CO3 NH4NO3 LiCN
Answer» Amongst the following, the total number of compounds whose aqueous solution turns red litmus paper blue is ___ KCN $K_{2} S O_{4}$ $(N H_{4})_{2} C_{2} O_{4}$ $N a C l$ $Z n (N O_{3})_{2}$ $F e C l_{3}$ $K_{2} C O_{3}$ $N H_{4} N O_{3}$ $L i C N$

Discussion

9265.	Which element in the square brackets has the highest oxidation number among the given options?
Answer» Which element in the square brackets has the highest oxidation number among the given options?

Discussion

9266.	Question 2 (b) (b) Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density
Answer» Question 2 (b) (b) Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density

Discussion

9267.	Why can't value of Avogadro constant be 6022×10^22
Answer» Why can't value of Avogadro constant be 6022×10^22

Discussion

9268.	Which of the following metals is not amphoteric in nature?
Answer» Which of the following metals is not amphoteric in nature?

Discussion

9269.	Assume the following reaction is carried out in acidic medium. 6e−+Cr2O72−⟶2Cr3++7H2O How many H+ do we need to add to the LHS to balance the H atoms?
Answer» Assume the following reaction is carried out in acidic medium. $6 e^{-} + C r_{2} {O_{7}}^{2 -} ⟶ 2 {C r}^{3 +} + 7 H_{2} O$ How many $H^{+}$ do we need to add to the LHS to balance the H atoms?

Discussion

9270.	(a) What is meant by a solution ? Give two examples of solutions. (b) What is suspension ? Give two examples of suspensions. (c) What is a colloid ? Give two examples of colloids (or colloidal solutions).
Answer» (a) What is meant by a solution ? Give two examples of solutions. (b) What is suspension ? Give two examples of suspensions. (c) What is a colloid ? Give two examples of colloids (or colloidal solutions).

9270.

(a) What is meant by a solution ? Give two examples of solutions. (b) What is suspension ? Give two examples of suspensions. (c) What is a colloid ? Give two examples of colloids (or colloidal solutions).

Answer»

(a) What is meant by a solution ? Give two examples of solutions.

(b) What is suspension ? Give two examples of suspensions.

(c) What is a colloid ? Give two examples of colloids (or colloidal solutions).

Discussion

9271.	What is the other name for impure substances ? Give two examples of impure substances.
Answer» What is the other name for impure substances ? Give two examples of impure substances.

Discussion

9272.	I learnt from a video in YouTube about the periodic table according to which I have a doubt. I learnt that hydrogen is the lightest element, it has atomic number:1. Uranium is the heaviest element, having atomic no. :92. Hence,somehow it tells us about the heaviness of a particular element. My doubt is: Periodic table doesn't end with Uranium, it ends with an element having atomic no. :118 because that scientists have created some man made elements too. But if there is an element having atomic no.:118,is Uranium still the heaviest element? If so, why is Uranium isn't the last one in the periodic table?
Answer» I learnt from a video in YouTube about the periodic table according to which I have a doubt. I learnt that hydrogen is the lightest element, it has atomic number:1. Uranium is the heaviest element, having atomic no. :92. Hence,somehow it tells us about the heaviness of a particular element. My doubt is: Periodic table doesn't end with Uranium, it ends with an element having atomic no. :118 because that scientists have created some man made elements too. But if there is an element having atomic no.:118,is Uranium still the heaviest element? If so, why is Uranium isn't the last one in the periodic table?

Discussion

9273.	The temperature at which the substances get converted from their liquid state to gaseous state is called as _____________.
Answer» The temperature at which the substances get converted from their liquid state to gaseous state is called as _____________.

Discussion

9274.	Why atoms are divisible
Answer» Why atoms are divisible

Discussion

9275.	Question 10 (i) Classify the following into elements, compounds and mixtures. i. Air
Answer» Question 10 (i) Classify the following into elements, compounds and mixtures. i. Air

Discussion

9276.	Which all gases are evolved in the thermal dissociation of nitric acid?
Answer» Which all gases are evolved in the thermal dissociation of nitric acid?

Discussion

9277.	The valence shell of carbon contains
Answer» The valence shell of carbon contains

Discussion

9278.	An atom of element E contains 3 protons, 3 electrons and 4 neutrons: (a) What is its atomic number? (b) What is its mass number? (c) Write the electronic configuration of the element E. (d) State whether element E is a metal or non-metal. Why? (e) What type of ion, cation or anion, will be formed by an atom of element E? Why? (f) Write the symbol of the ion formed by an atom of element E. (g) What could element E be?
Answer» An atom of element E contains 3 protons, 3 electrons and 4 neutrons: (a) What is its atomic number? (b) What is its mass number? (c) Write the electronic configuration of the element E. (d) State whether element E is a metal or non-metal. Why? (e) What type of ion, cation or anion, will be formed by an atom of element E? Why? (f) Write the symbol of the ion formed by an atom of element E. (g) What could element E be?

Discussion

9279.	2Pb(NO3)2→2PbO+nA+O2 What is nA in the given reaction?
Answer» $2 P b (N O_{3})_{2} \to 2 P b O + n A + O_{2}$ What is nA in the given reaction?

Discussion

9280.	Why 0k is equal to -273 degree celcius ?
Answer» Why 0k is equal to -273 degree celcius ?

Discussion

9281.	On moving down a group the number of valence electrons:
Answer» On moving down a group the number of valence electrons:

Discussion

9282.	Choose one term from the following which includes the other three : aerosol, emulsion, colloid, sol
Answer» Choose one term from the following which includes the other three : aerosol, emulsion, colloid, sol

9282.

Choose one term from the following which includes the other three : aerosol, emulsion, colloid, sol

Answer»

Choose one term from the following which includes the other three :

aerosol, emulsion, colloid, sol

Discussion

9283.	Name any two : (a) natural sources of atmospheric polluction. (b) gases which are responsible for the formation of acid rain.
Answer» Name any two : (a) natural sources of atmospheric polluction. (b) gases which are responsible for the formation of acid rain.

9283.

Name any two : (a) natural sources of atmospheric polluction. (b) gases which are responsible for the formation of acid rain.

Answer»

Name any two :

(a) natural sources of atmospheric polluction.

(b) gases which are responsible for the formation of acid rain.

Discussion

9284.	Atomicity of calcium phosphate will be A 12 B 13 C 17 D 15
Answer» Atomicity of calcium phosphate will be A 12 B 13 C 17 D 15

9284.

Atomicity of calcium phosphate will be A 12 B 13 C 17 D 15

Answer»

Atomicity of calcium phosphate will be

A 12

B 13

C 17

D 15

Discussion

9285.	Increase in which of the following gases cause global warming?
Answer» Increase in which of the following gases cause global warming?

Discussion

9286.	Question 32 Complete the table on the basis of information available in the symbols given below. (a) 3517Cl (b) 126C (c) 8135Br
Answer» Question 32 Complete the table on the basis of information available in the symbols given below. (a) $_{17}^{35} C l (b)_{6}^{12} C (c)_{35}^{81} B r$

Discussion

9287.	A solution is made by dissolving 60 g of sodium chloride in 360 g of water. Find the mass percentage of the solution.
Answer» A solution is made by dissolving 60 g of sodium chloride in 360 g of water. Find the mass percentage of the solution.

Discussion

9288.	Which of the following formulae represent nitrite radical?
Answer» Which of the following formulae represent nitrite radical?

Discussion

9289.	From the following reaction sequence Cl2 + 2KOH → KCl + KClO + H2O 3KClO → 2KCl + KClO3 4KClO3 → 3KClO4+KCl Calculate the mass of chlorine needed to produce 23g of KClO4
Answer» From the following reaction sequence $C l_{2}$ + 2KOH $\to$ KCl + KClO + $H_{2} O$ 3KClO $\to$ 2KCl + $K C l O_{3}$ $4 K C l O_{3}$ $\to$ $3 K C l O_{4} + K C l$ Calculate the mass of chlorine needed to produce 23g of $K C l O_{4}$

9289.

From the following reaction sequence Cl2 + 2KOH → KCl + KClO + H2O 3KClO → 2KCl + KClO3 4KClO3 → 3KClO4+KCl Calculate the mass of chlorine needed to produce 23g of KClO4

Answer»

From the following reaction sequence
$C l_{2}$ + 2KOH $\to$ KCl + KClO + $H_{2} O$
3KClO $\to$ 2KCl + $K C l O_{3}$
$4 K C l O_{3}$ $\to$ $3 K C l O_{4} + K C l$

Calculate the mass of chlorine needed to produce 23g of $K C l O_{4}$

Discussion

9290.	Which one of the following properties of an element can never be variable?
Answer» Which one of the following properties of an element can never be variable?

Discussion

9291.	Mg + H2SO4 → A–– + H2 (Mg) (dilute) Mg + 2H2SO4 → A–– + B–– + 2H2O. (Concentrated) A & B are
Answer» $M g + H_{2} S O_{4} \to A - - + H_{2} (M g) (d i l u t e)$ $M g + 2 H_{2} S O_{4} \to A - - + B - - + 2 H_{2} O . (C o n c e n t r a t e d)$ A & B are

9291.

Mg + H2SO4 → A–– + H2 (Mg) (dilute) Mg + 2H2SO4 → A–– + B–– + 2H2O. (Concentrated) A & B are

Answer»

$M g + H_{2} S O_{4} \to A - - + H_{2} (M g) (d i l u t e)$

$M g + 2 H_{2} S O_{4} \to A - - + B - - + 2 H_{2} O . (C o n c e n t r a t e d)$ A & B are

Discussion

9292.	Which of the following acts as a catalyst in Haber’s process
Answer» Which of the following acts as a catalyst in Haber’s process

Discussion

9293.	Difference Between a gas and a vapour.
Answer» Difference Between a gas and a vapour.

Discussion

9294.	Find the formula of potassium nitrate.
Answer» Find the formula of potassium nitrate.

Discussion

9295.	Why large no. of lines appear in the spectrum of hydrogen although it contains only one electron?
Answer» Why large no. of lines appear in the spectrum of hydrogen although it contains only one electron?

Discussion

9296.	What are allotropes?
Answer» What are allotropes?

Discussion

9297.	Why elements show variable valency?
Answer» Why elements show variable valency?

Discussion

9298.	How to easily remember the periodic table elements
Answer» How to easily remember the periodic table elements

Discussion

9299.	Define evaporation ? ( 25 to 50 words )
Answer» Define evaporation ? ( 25 to 50 words )

Discussion

9300.	Air is dense at sea level. This is an application of –
Answer» Air is dense at sea level. This is an application of –

Discussion

Explore topic-wise InterviewSolutions in .

1st shell has 2 electrons 2nd one has 8 and so on. The 3rd shell has a place for 18 electrons. So will it have 18 electrons or just 8?

Why are lanthanides and actinides placed in two rows at the bottom of the periodic table?

What kind of mixture is air ? Give reasons.

Explain the following giving examples a.saturated solution b. Pure substance c. Colloid d. Suspension

effect of change of temperature

Can we use technique of creating high pressure to convert evaporated acetone to acetone in liquid or solid state

Give reasons isotopes of an element are chemically similar noble gases show least reactivity

How many molecules of K2CO3 are present in one mole? ( given atomic masses K=39u C=12u and O=16u)

Why do solids have regular geometrical shape?

You have one glass of water and some sugar and sand. How will you create a homogeneous mixture ?

Does the temperature of liquid change during evaporation?

The formula of sodium hydroxide is _______ .

Which of the following cause maximum water pollution?

Amongst the following, the total number of compounds whose aqueous solution turns red litmus paper blue is ___ KCN K2SO4 (NH4)2C2O4 NaCl Zn(NO3)2 FeCl3 K2CO3 NH4NO3 LiCN

Which element in the square brackets has the highest oxidation number among the given options?

Question 2 (b) (b) Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density

Why can't value of Avogadro constant be 6022×10^22

Which of the following metals is not amphoteric in nature?

Assume the following reaction is carried out in acidic medium. 6e−+Cr2O72−⟶2Cr3++7H2O How many H+ do we need to add to the LHS to balance the H atoms?

(a) What is meant by a solution ? Give two examples of solutions. (b) What is suspension ? Give two examples of suspensions. (c) What is a colloid ? Give two examples of colloids (or colloidal solutions).

What is the other name for impure substances ? Give two examples of impure substances.

The temperature at which the substances get converted from their liquid state to gaseous state is called as _____________.

Why atoms are divisible

Question 10 (i) Classify the following into elements, compounds and mixtures. i. Air

Which all gases are evolved in the thermal dissociation of nitric acid?

The valence shell of carbon contains

2Pb(NO3)2→2PbO+nA+O2 What is nA in the given reaction?

Why 0k is equal to -273 degree celcius ?

On moving down a group the number of valence electrons:

Choose one term from the following which includes the other three : aerosol, emulsion, colloid, sol

Name any two : (a) natural sources of atmospheric polluction. (b) gases which are responsible for the formation of acid rain.

Atomicity of calcium phosphate will be A 12 B 13 C 17 D 15

Increase in which of the following gases cause global warming?

Question 32 Complete the table on the basis of information available in the symbols given below. (a) 3517Cl (b) 126C (c) 8135Br

A solution is made by dissolving 60 g of sodium chloride in 360 g of water. Find the mass percentage of the solution.

Which of the following formulae represent nitrite radical?

From the following reaction sequence Cl2 + 2KOH → KCl + KClO + H2O 3KClO → 2KCl + KClO3 4KClO3 → 3KClO4+KCl Calculate the mass of chlorine needed to produce 23g of KClO4

Which one of the following properties of an element can never be variable?

Mg + H2SO4 → A–– + H2 (Mg) (dilute) Mg + 2H2SO4 → A–– + B–– + 2H2O. (Concentrated) A &amp; B are

Which of the following acts as a catalyst in Haber’s process

Difference Between a gas and a vapour.

Find the formula of potassium nitrate.

Why large no. of lines appear in the spectrum of hydrogen although it contains only one electron?

What are allotropes?

Why elements show variable valency?

How to easily remember the periodic table elements

Define evaporation ? ( 25 to 50 words )

Air is dense at sea level. This is an application of –

Mg + H2SO4 → A–– + H2 (Mg) (dilute) Mg + 2H2SO4 → A–– + B–– + 2H2O. (Concentrated) A & B are