10223 + Interview Questions in Chemistry Page 74 InterviewSolution

3651.	Differentiate between formulae of elements and formulae of the compound.
Answer» Differentiate between formulae of elements and formulae of the compound.

Discussion

3652.	What are petrochemical?
Answer» What are petrochemical?

Discussion

3653.	26.calculate the enthalpy of formation of acetic acid if the enthalpy of combustion of co2 gas and H2o liquid is -867 kJ per mol and enthalpy of formation of Co2 and H2o are -393.5 and -285.9 kJ per mol respectively.
Answer» 26.calculate the enthalpy of formation of acetic acid if the enthalpy of combustion of co2 gas and H2o liquid is -867 kJ per mol and enthalpy of formation of Co2 and H2o are -393.5 and -285.9 kJ per mol respectively.

Discussion

3654.	39.Copper is less reactive than hydrogen so it can't be displace it So , can we take sulpuric acid instead of hydrochloric acid ?
Answer» 39.Copper is less reactive than hydrogen so it can't be displace it So , can we take sulpuric acid instead of hydrochloric acid ?

Discussion

3655.	Which of the following processes is used in extractive metallurgy of Magnesium?
Answer» Which of the following processes is used in extractive metallurgy of Magnesium?

Discussion

3656.	Question 7(a) What is the mass of: (a) 1 mole of nitrogen atoms?
Answer» Question 7(a) What is the mass of: (a) 1 mole of nitrogen atoms?

Discussion

3657.	Coke is more valuable when used : (a) as a fuel for industrail boilers (b) as an oxidising agent (c) as a reducing agent (d) as a fuel in domestic ovens
Answer» Coke is more valuable when used : (a) as a fuel for industrail boilers (b) as an oxidising agent (c) as a reducing agent (d) as a fuel in domestic ovens

Discussion

3658.	Explain:(i) Larger the atomic size, more metallic is the element.(ii) Halogens have high electron affinity.(iii) Size of atom changes when it loses or gain electron.(iv) K is more reactive than Li.(v) Electronegativity of Cl is higher than S.(vi) Group 17 elements are non-metals, while group 1 elements are metals.
Answer» Explain: (i) Larger the atomic size, more metallic is the element. (ii) Halogens have high electron affinity. (iii) Size of atom changes when it loses or gain electron. (iv) K is more reactive than Li. (v) Electronegativity of Cl is higher than S. (vi) Group 17 elements are non-metals, while group 1 elements are metals.

Discussion

3659.	On the basis of the information available from the reaction : 1 2 Al2O3, G 827KJmol 3 2 Al O 3 4 + = of O2, the minimum e.m.f. required to carry out electrolysis of Al2O3 is (F = 96500 C mol1) (1) 2.14 V (2) 4.28 V (3) 6.42 V (4) 8.56 V How to find value of n?
Answer» On the basis of the information available from the reaction : 1 2 Al2O3, G 827KJmol 3 2 Al O 3 4 + = of O2, the minimum e.m.f. required to carry out electrolysis of Al2O3 is (F = 96500 C mol1) (1) 2.14 V (2) 4.28 V (3) 6.42 V (4) 8.56 V How to find value of n?

Discussion

3660.	In an experiment, the following reaction takes place.C(s)+O2(g)→CO2(g)12 g 32 g 44 gHow much mass of carbon dioxide will be produced, when 12 g of carbon reacts with 48 g of oxygen?
Answer» In an experiment, the following reaction takes place. $C (s) + O_{2} (g) \to {CO}_{2} (g) 12 g 32 g 44 g$ How much mass of carbon dioxide will be produced, when 12 g of carbon reacts with 48 g of oxygen?

Discussion

3661.	Which of the following are matter?Chair, air, love, smell, hate, almonds, thought, cold, cold-drink.
Answer» Which of the following are matter? Chair, air, love, smell, hate, almonds, thought, cold, cold-drink.

Discussion

3662.	in a unit cell A atom is place that every corner and B atom is place that alternate face the formula of compound is
Answer» in a unit cell A atom is place that every corner and B atom is place that alternate face the formula of compound is

Discussion

3663.	Radius of nucleus is of the order of .............. m. __
Answer» Radius of nucleus is of the order of .............. m. __

Discussion

3664.	Why an electron cannot exchange its position with previous orbital's electron of same subshell to gain stability?
Answer» Why an electron cannot exchange its position with previous orbital's electron of same subshell to gain stability?

Discussion

3665.	37 Calculate the number of electrons which will together weigh one gram.
Answer» 37 Calculate the number of electrons which will together weigh one gram.

Discussion

3666.	In the process of preparation of acids by oxidization of non metals . Does this method of acid preparation only form oxyacids ?
Answer» In the process of preparation of acids by oxidization of non metals . Does this method of acid preparation only form oxyacids ?

Discussion

3667.	What will happen if a saturated solution is : (i) heated, and (ii) cooled ?
Answer» What will happen if a saturated solution is : (i) heated, and (ii) cooled ?

Discussion

3668.	Why is Carbon 12 isotope used as a standard reference for measuring atomic mass?
Answer» Why is Carbon 12 isotope used as a standard reference for measuring atomic mass?

Discussion

3669.	The simplest formula of a compound containing 50% of element X (Atomic weight 10) and 50% of element(oc)ae6811Y (atomic weight20) is(1) XY(2) XY(3) XY2(4) X2Y3
Answer» The simplest formula of a compound containing 50% of element X (Atomic weight 10) and 50% of element(oc)ae6811Y (atomic weight20) is(1) XY(2) XY(3) XY2(4) X2Y3

Discussion

3670.	Give reason for the following:We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.
Answer» Give reason for the following: We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.

Discussion

3671.	Which among the following is written on the LHS of a chemical equation?
Answer» Which among the following is written on the LHS of a chemical equation?

Discussion

3672.	The chemical formula of aluminium oxide is:
Answer» The chemical formula of aluminium oxide is:

Discussion

3673.	If mass of photons is zero then if they travel with the speed of light their mass should increase but it doesn't why?
Answer» If mass of photons is zero then if they travel with the speed of light their mass should increase but it doesn't why?

Discussion

3674.	A sample of hard water from some source was found to release carbon dioxide gas when boiled. It is possible to titrate the sample of water from the same source with ?
Answer» A sample of hard water from some source was found to release carbon dioxide gas when boiled. It is possible to titrate the sample of water from the same source with ?

Discussion

3675.	What is the average atomic mass of 3517Cl and 3717Cl ? And what is the formula to do so?
Answer» What is the average atomic mass of ³⁵₁₇Cl and ³⁷₁₇Cl ? And what is the formula to do so?

Discussion

3676.	47 Consider the following statements: i. Increase in concentration of reactant increases the rate of a zero order reaction ii. Rate constant k is equal to collision frequemcy A if Ea=0 iii. Rate constant k is equal to collision frequency A if Ea= iv. ln k vs T is a straight line v. ln k vs 1/T is a straight line Correct statements are a. i and iv b. ii and v c. iii and iv d. ii and iii e. i and v
Answer» 47 Consider the following statements: i. Increase in concentration of reactant increases the rate of a zero order reaction ii. Rate constant k is equal to collision frequemcy A if Ea=0 iii. Rate constant k is equal to collision frequency A if Ea= iv. ln k vs T is a straight line v. ln k vs 1/T is a straight line Correct statements are a. i and iv b. ii and v c. iii and iv d. ii and iii e. i and v

Discussion

3677.	12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. It wil emit:1) 2 lymann and 1 balmer line2) 3 lymann3) 3 balmer 4) 1 lymann and 2 balmer line
Answer» 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. It wil emit: 1) 2 lymann and 1 balmer line 2) 3 lymann 3) 3 balmer 4) 1 lymann and 2 balmer line

Discussion

3678.	Alpha particle scattering experiment gave totally unexpected results. Which of the following observations were made?
Answer» Alpha particle scattering experiment gave totally unexpected results. Which of the following observations were made?

Discussion

3679.	State the postulates of Dalton's atomic theory.
Answer» State the postulates of Dalton's atomic theory.

Discussion

3680.	Question 20You might have observed on a dry day that when you touch the screen of a television or computer monitor (with picture tube), you get a slight shock. Why does it happen?
Answer» Question 20 You might have observed on a dry day that when you touch the screen of a television or computer monitor (with picture tube), you get a slight shock. Why does it happen?

3680.

Question 20You might have observed on a dry day that when you touch the screen of a television or computer monitor (with picture tube), you get a slight shock. Why does it happen?

Answer»

Question 20

You might have observed on a dry day that when you touch the screen of a television or computer monitor (with picture tube), you get a slight shock. Why does it happen?

Discussion

3681.	consider an isolated unit cell of NaCl where the chloride ions are forming the close packing ,how many sodium ions are present in this isolated unit cell?
Answer» consider an isolated unit cell of NaCl where the chloride ions are forming the close packing ,how many sodium ions are present in this isolated unit cell?

Discussion

3682.	The general formula of cyclic alkanes is
Answer» The general formula of cyclic alkanes is

Discussion

3683.	Why density of water is maximum at 4 degrees Celsius?
Answer» Why density of water is maximum at 4 degrees Celsius?

Discussion

3684.	What is a combination reaction? Give two examples.
Answer» What is a combination reaction? Give two examples.

Discussion

3685.	15.What are the size variations in the elements from atomic number 21 to atomic number 30 and why
Answer» 15.What are the size variations in the elements from atomic number 21 to atomic number 30 and why

Discussion

3686.	Steam at 100° C is passed into 20 g of water at 10° C. When water acquires a temperature of 80° C, the mass of water present will be: [Take specific heat of water =1 cal g−1C−1 and latent heat of steam =540 cal g−1]
Answer» Steam at $100 ° C$ is passed into $20 g$ of water at $10 ° C$ . When water acquires a temperature of $80 ° C$ , the mass of water present will be: [Take specific heat of water $= 1 {cal g}^{- 1} C^{- 1}$ and latent heat of steam $= 540 {cal g}^{- 1}$ ]

Discussion

3687.	Reaction of Nitrous acid with 1° Nitro alkane , 2° Nitro alkane will give respectivelyA) Red colour , Blue colourB) Red colour , Red colourC) Blue colour, Blue ColourD) Blue colour , Red colour
Answer» Reaction of Nitrous acid with 1° Nitro alkane , 2° Nitro alkane will give respectively A) Red colour , Blue colour B) Red colour , Red colour C) Blue colour, Blue Colour D) Blue colour , Red colour

Discussion

3688.	65. At 25degree celcius the vapour pressure of pure water is 23.76mm of hg and that of an aqueous solution of urea is 22.98mm of hg.calculate the molality of the solution.
Answer» 65. At 25degree celcius the vapour pressure of pure water is 23.76mm of hg and that of an aqueous solution of urea is 22.98mm of hg.calculate the molality of the solution.

Discussion

3689.	The statement ‘the openness of a space is created by the firmness of its boundaries’, appears contradictory. Which of the following statements provides the best justification for the proposition?
Answer» The statement ‘the openness of a space is created by the firmness of its boundaries’, appears contradictory. Which of the following statements provides the best justification for the proposition?

Discussion

3690.	The formula for a compound is given as C3H8. This is a/an
Answer» The formula for a compound is given as $C_{3}$ $H_{8}$ . This is a/an

Discussion

3691.	A jar filled with oxygen gas is given. Using which physical property can it be proved that it is oxygen?
Answer» A jar filled with oxygen gas is given. Using which physical property can it be proved that it is oxygen?

Discussion

3692.	How does a scrubber help in reducing the formation of acid rain ?
Answer» How does a scrubber help in reducing the formation of acid rain ?

Discussion

3693.	Fill in the following blanks : (a) Milk is a ___ solution but vinegar is a ___ solution. (b) A colloid is a___ mixture and its components can be separated by the technique known as___
Answer» Fill in the following blanks : (a) Milk is a ___ solution but vinegar is a ___ solution. (b) A colloid is a___ mixture and its components can be separated by the technique known as___

3693.

Fill in the following blanks : (a) Milk is a _ solution but vinegar is a _ solution. (b) A colloid is a_ mixture and its components can be separated by the technique known as_

Answer»

Fill in the following blanks :

(a) Milk is a ___ solution but vinegar is a ___ solution.

(b) A colloid is a___ mixture and its components can be separated by the technique known as___

Discussion

3694.	Give one example of a radioactive isotope which is used as a fuel in the reactors of nuclear power plants.
Answer» Give one example of a radioactive isotope which is used as a fuel in the reactors of nuclear power plants.

Discussion

3695.	A driver is able to cut through water in a swimming pool. Which properpr of matter does it show?
Answer» A driver is able to cut through water in a swimming pool. Which properpr of matter does it show?

Discussion

3696.	State which substance is getting oxidised and reduced in the following equation: MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2
Answer» State which substance is getting oxidised and reduced in the following equation: MnO₂+ 4HCl -> MnCl₂+ 2H₂O + Cl₂

Discussion

3697.	Why do gases have neither a fixed shape nor a fixed volume ?
Answer» Why do gases have neither a fixed shape nor a fixed volume ?

Discussion

3698.	Which is correct for gases showing attraction behaviour?
Answer» Which is correct for gases showing attraction behaviour?

Discussion

3699.	2HgO (s) X→ 2Hg(l) + O2(g) What is ′X′ in the equation?
Answer» $2 H g O (s) X \to 2 H g (l) + O_{2} (g)$ What is $^{'} X^{'}$ in the equation?

3699.

2HgO (s) X→ 2Hg(l) + O2(g) What is ′X′ in the equation?

Answer»

$2 H g O (s) X \to 2 H g (l) + O_{2} (g)$

What is $^{'} X^{'}$ in the equation?

Discussion

3700.	Which of the following symbol was used by Dalton to represent the element Sulphur?
Answer» Which of the following symbol was used by Dalton to represent the element Sulphur?

Discussion

Explore topic-wise InterviewSolutions in .

Differentiate between formulae of elements and formulae of the compound.

What are petrochemical?

26.calculate the enthalpy of formation of acetic acid if the enthalpy of combustion of co2 gas and H2o liquid is -867 kJ per mol and enthalpy of formation of Co2 and H2o are -393.5 and -285.9 kJ per mol respectively.

39.Copper is less reactive than hydrogen so it can't be displace it So , can we take sulpuric acid instead of hydrochloric acid ?

Which of the following processes is used in extractive metallurgy of Magnesium?

Question 7(a) What is the mass of: (a) 1 mole of nitrogen atoms?

Coke is more valuable when used : (a) as a fuel for industrail boilers (b) as an oxidising agent (c) as a reducing agent (d) as a fuel in domestic ovens

On the basis of the information available from the reaction : 1 2 Al2O3, G 827KJmol 3 2 Al O 3 4 + = of O2, the minimum e.m.f. required to carry out electrolysis of Al2O3 is (F = 96500 C mol1) (1) 2.14 V (2) 4.28 V (3) 6.42 V (4) 8.56 V How to find value of n?

In an experiment, the following reaction takes place.C(s)+O2(g)→CO2(g)12 g 32 g 44 gHow much mass of carbon dioxide will be produced, when 12 g of carbon reacts with 48 g of oxygen?

Which of the following are matter?Chair, air, love, smell, hate, almonds, thought, cold, cold-drink.

in a unit cell A atom is place that every corner and B atom is place that alternate face the formula of compound is

Radius of nucleus is of the order of .............. m. __

Why an electron cannot exchange its position with previous orbital's electron of same subshell to gain stability?

37 Calculate the number of electrons which will together weigh one gram.

In the process of preparation of acids by oxidization of non metals . Does this method of acid preparation only form oxyacids ?

What will happen if a saturated solution is : (i) heated, and (ii) cooled ?

Why is Carbon 12 isotope used as a standard reference for measuring atomic mass?

The simplest formula of a compound containing 50% of element X (Atomic weight 10) and 50% of element(oc)ae6811Y (atomic weight20) is(1) XY(2) XY(3) XY2(4) X2Y3

Give reason for the following:We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.

Which among the following is written on the LHS of a chemical equation?

The chemical formula of aluminium oxide is:

If mass of photons is zero then if they travel with the speed of light their mass should increase but it doesn't why?

A sample of hard water from some source was found to release carbon dioxide gas when boiled. It is possible to titrate the sample of water from the same source with ?

What is the average atomic mass of 3517Cl and 3717Cl ? And what is the formula to do so?

12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. It wil emit:1) 2 lymann and 1 balmer line2) 3 lymann3) 3 balmer 4) 1 lymann and 2 balmer line

Alpha particle scattering experiment gave totally unexpected results. Which of the following observations were made?

State the postulates of Dalton's atomic theory.

Question 20You might have observed on a dry day that when you touch the screen of a television or computer monitor (with picture tube), you get a slight shock. Why does it happen?

consider an isolated unit cell of NaCl where the chloride ions are forming the close packing ,how many sodium ions are present in this isolated unit cell?

The general formula of cyclic alkanes is

Why density of water is maximum at 4 degrees Celsius?

What is a combination reaction? Give two examples.

15.What are the size variations in the elements from atomic number 21 to atomic number 30 and why

Steam at 100° C is passed into 20 g of water at 10° C. When water acquires a temperature of 80° C, the mass of water present will be: [Take specific heat of water =1 cal g−1C−1 and latent heat of steam =540 cal g−1]

Reaction of Nitrous acid with 1° Nitro alkane , 2° Nitro alkane will give respectivelyA) Red colour , Blue colourB) Red colour , Red colourC) Blue colour, Blue ColourD) Blue colour , Red colour

65. At 25degree celcius the vapour pressure of pure water is 23.76mm of hg and that of an aqueous solution of urea is 22.98mm of hg.calculate the molality of the solution.

The statement ‘the openness of a space is created by the firmness of its boundaries’, appears contradictory. Which of the following statements provides the best justification for the proposition?

The formula for a compound is given as C3H8. This is a/an

A jar filled with oxygen gas is given. Using which physical property can it be proved that it is oxygen?

How does a scrubber help in reducing the formation of acid rain ?

Fill in the following blanks : (a) Milk is a ___ solution but vinegar is a ___ solution. (b) A colloid is a___ mixture and its components can be separated by the technique known as___

Give one example of a radioactive isotope which is used as a fuel in the reactors of nuclear power plants.

A driver is able to cut through water in a swimming pool. Which properpr of matter does it show?

State which substance is getting oxidised and reduced in the following equation: MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2

Why do gases have neither a fixed shape nor a fixed volume ?

Which is correct for gases showing attraction behaviour?

2HgO (s) X→ 2Hg(l) + O2(g) What is ′X′ in the equation?

Which of the following symbol was used by Dalton to represent the element Sulphur?

Fill in the following blanks : (a) Milk is a _ solution but vinegar is a _ solution. (b) A colloid is a_ mixture and its components can be separated by the technique known as_