15280 + Interview Questions in Chemistry Page 231 InterviewSolution

11501.	Why the oxides of a high reactive metals cannot be reduced by carbon
Answer» Why the oxides of a high reactive metals cannot be reduced by carbon

Discussion

11502.	The reaction of sodium metal is found to be highly explosive. Comment.
Answer» The reaction of sodium metal is found to be highly explosive. Comment.

Discussion

11503.	Why does Bee sting cause pain and irritation rubbing of baking soda on sting areas gives relief how
Answer» Why does Bee sting cause pain and irritation rubbing of baking soda on sting areas gives relief how

Discussion

11504.	Why do you think the acidic stomach does not digest the stomach itself?
Answer» Why do you think the acidic stomach does not digest the stomach itself?

Discussion

11505.	Atomic number is considered to be a more appropriate parameter than atomic mass for classification of elements in a periodic table. why? (5 marks)
Answer» Atomic number is considered to be a more appropriate parameter than atomic mass for classification of elements in a periodic table. why? (5 marks)

Discussion

11506.	When lead nitrate reacts with ammonium hydroxide, a chalky white precipitate is formed. The precipitate formed is insoluble in excess of ammonium hydroxide. Name this precipitate.
Answer» When lead nitrate reacts with ammonium hydroxide, a chalky white precipitate is formed. The precipitate formed is insoluble in excess of ammonium hydroxide. Name this precipitate.

Discussion

11507.	Which of the following gases is produced by burning Louisiana sulphur in the purified air?
Answer» Which of the following gases is produced by burning Louisiana sulphur in the purified air?

Discussion

11508.	In an endothermic process the solubility ________ with an increase in temperature.
Answer» In an endothermic process the solubility ________ with an increase in temperature.

Discussion

11509.	Hydrogen chloride gas being highly soluble in water is dried by:
Answer» Hydrogen chloride gas being highly soluble in water is dried by:

Discussion

11510.	According to law of mass action, the rate of a chemical reaction is proportional to:
Answer» According to law of mass action, the rate of a chemical reaction is proportional to:

Discussion

11511.	Copper carbonate is heated. The colour of its residue on cooling is
Answer» Copper carbonate is heated. The colour of its residue on cooling is

Discussion

11512.	Question 21.1 Complete the missing components/variables given as x and y in the following reaction. Pb(NO3)2(aq)+2KI(aq)→PbI2(x)+2KNO3(y)
Answer» Question 21.1 Complete the missing components/variables given as x and y in the following reaction. ${Pb(NO}_{3})_{2} (aq) + 2 KI(aq) \to {PbI}_{2} (x) + 2 {KNO}_{3} (y)$

Discussion

11513.	You have prepared a saturated solution of sugar at room temperature. Is it possible to dissolve some more grams of sugar to this solution? Justify your answer.
Answer» You have prepared a saturated solution of sugar at room temperature. Is it possible to dissolve some more grams of sugar to this solution? Justify your answer.

Discussion

11514.	Write the full form of IUPAC. Name the elements represented by the following symbols : Au, Pb, Sn, Hg.
Answer» Write the full form of IUPAC. Name the elements represented by the following symbols : Au, Pb, Sn, Hg.

11514.

Write the full form of IUPAC. Name the elements represented by the following symbols : Au, Pb, Sn, Hg.

Answer»

Write the full form of IUPAC. Name the elements represented by the following symbols :

Au, Pb, Sn, Hg.

Discussion

11515.	The reaction between red lead and hydrochloric acid is given below: Pb3O4+8HCLI→3PbCl2+4H2O+Cl2 calculate : (a) the amss fo lead chloride formed by the action of 6.85 g of red lead, (b) the mass fo chlorine and (c) the volume of chlorine evolved at STP.
Answer» The reaction between red lead and hydrochloric acid is given below: $P b_{3} O_{4} + 8 H C L I \to 3 P b C l_{2} + 4 H_{2} O + C l_{2}$ calculate : (a) the amss fo lead chloride formed by the action of 6.85 g of red lead, (b) the mass fo chlorine and (c) the volume of chlorine evolved at STP.

Discussion

11516.	In nature, aluminium is found in the form of compounds while gold is found in free state. Give reason.
Answer» In nature, aluminium is found in the form of compounds while gold is found in free state. Give reason.

Discussion

11517.	What is the pH of a neutral solution ?
Answer» What is the pH of a neutral solution ?

Discussion

11518.	Why does the white loghl split into different colours when it passes through glass prism
Answer» Why does the white loghl split into different colours when it passes through glass prism

Discussion

11519.	Calculate the pressure exerted by 5 mol of CO2 in 1 L vessel at 47∘C using van der Waals equation. Also, calculate the pressure for an ideal gas. Given a=3.592 atm L2mol−2, b = 0.0427 L mol−1 .
Answer» Calculate the pressure exerted by 5 mol of $C O_{2}$ in 1 L vessel at $47^{\circ} C$ using van der Waals equation. Also, calculate the pressure for an ideal gas. Given $a = 3.592 a t m L^{2} m o l^{- 2}$ , b = 0.0427 L $m o l^{- 1}$ .

Discussion

11520.	The first member of p-block differs from remaining members of corresponding group because of:
Answer» The first member of p-block differs from remaining members of corresponding group because of:

Discussion

11521.	CaOCl2 is the product of reaction between calcium hydroxide and ___ and is commonly called as ___.
Answer» $C a O C l_{2}$ is the product of reaction between calcium hydroxide and ___ and is commonly called as ___.

Discussion

11522.	An element 'X' has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of 'X'. Also write group number, period number and valency of 'X'.
Answer» An element 'X' has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of 'X'. Also write group number, period number and valency of 'X'.

Discussion

11523.	(a) Write balanced equations for the following reactions: 1. Copper oxide and dilute hydrochloride acid. 2. Manganese(IV) oxide and concentrated hydrochloric acid. (b) 1. Name the experiment illustrated below : 2. Which property of hydrogen chloride is demonstrated by this experiment? 3. State the colour of the water that has entered the round-bottomed flask. [5 MARKS]
Answer» (a) Write balanced equations for the following reactions: 1. Copper oxide and dilute hydrochloride acid. 2. Manganese(IV) oxide and concentrated hydrochloric acid. (b) 1. Name the experiment illustrated below : 2. Which property of hydrogen chloride is demonstrated by this experiment? 3. State the colour of the water that has entered the round-bottomed flask. [5 MARKS]

Discussion

11524.	Metals X and Y can be recovered from the anode mud left behind after the electrolytic refining of copper metal. The coins made of metal X look new even after several years of use but the coins made of metal Y lose their shine gradually and get blackened soon. When metal X is alloyed with a small amount of metal Y, It becomes hard and hence suitable for making ornaments. What are metals X and Y? Also, state the colour of metal X.
Answer» Metals X and Y can be recovered from the anode mud left behind after the electrolytic refining of copper metal. The coins made of metal X look new even after several years of use but the coins made of metal Y lose their shine gradually and get blackened soon. When metal X is alloyed with a small amount of metal Y, It becomes hard and hence suitable for making ornaments. What are metals X and Y? Also, state the colour of metal X.

Discussion

11525.	(a) Write a balanced chemical equation for the laboratory preparation of nitric acid. (b) In the preparation of nitric acid from KNO3, concentrated hydrochloric acid is not used in place of concentrated sulphuric acid. Explain why. (c) Conc. nitric acid prepared in laboratory is yellow in colour. Why? How is this colour removed? [4 MARKS]
Answer» (a) Write a balanced chemical equation for the laboratory preparation of nitric acid. (b) In the preparation of nitric acid from $K N O_{3}$ , concentrated hydrochloric acid is not used in place of concentrated sulphuric acid. Explain why. (c) Conc. nitric acid prepared in laboratory is yellow in colour. Why? How is this colour removed? [4 MARKS]

Discussion

11526.	(a) Name a sodium compound used for softening hard water. (b) Which compound of calcium is used for disinfecting drinking water supply? (c) Name a metal compound which has detergent properties (cleansing properties). (d) Name one compound of calcium which is used for removing the colour of a coloured cloth. (e) State a peculiar (or remarkable) property of plaster of Paris. (f) Name the substance obtained by the action of chlorine on solid (dry) slaked lime.
Answer» (a) Name a sodium compound used for softening hard water. (b) Which compound of calcium is used for disinfecting drinking water supply? (c) Name a metal compound which has detergent properties (cleansing properties). (d) Name one compound of calcium which is used for removing the colour of a coloured cloth. (e) State a peculiar (or remarkable) property of plaster of Paris. (f) Name the substance obtained by the action of chlorine on solid (dry) slaked lime.

11526.

(a) Name a sodium compound used for softening hard water. (b) Which compound of calcium is used for disinfecting drinking water supply? (c) Name a metal compound which has detergent properties (cleansing properties). (d) Name one compound of calcium which is used for removing the colour of a coloured cloth. (e) State a peculiar (or remarkable) property of plaster of Paris. (f) Name the substance obtained by the action of chlorine on solid (dry) slaked lime.

Answer»

(a) Name a sodium compound used for softening hard water.

(b) Which compound of calcium is used for disinfecting drinking water supply?

(c) Name a metal compound which has detergent properties (cleansing properties).

(d) Name one compound of calcium which is used for removing the colour of a coloured cloth.

(e) State a peculiar (or remarkable) property of plaster of Paris.

(f) Name the substance obtained by the action of chlorine on solid (dry) slaked lime.

Discussion

11527.	Calculate the mass of CO2 produced by heating 20 g of pure limestone (CaCO3).
Answer» Calculate the mass of $C O_{2}$ produced by heating $20 g$ of pure limestone $(C a C O_{3})$ .

Discussion

11528.	Some of the usage(s) of ethanol is/are:
Answer» Some of the usage(s) of ethanol is/are:

Discussion

11529.	What do you observe when caustic soda solution is added to the following solution, first a little and then in excess: (a) FeCl3, (b) ZnSO4, (c) Pb(NO3)2, (d) CuSO4 ? Write balanced equations for these reactions.
Answer» What do you observe when caustic soda solution is added to the following solution, first a little and then in excess: (a) $F e C l_{3}$ , (b) $Z n S O_{4}$ , (c) $P b (N O_{3})_{2}$ , (d) $C u S O_{4}$ ? Write balanced equations for these reactions.

11529.

What do you observe when caustic soda solution is added to the following solution, first a little and then in excess: (a) FeCl3, (b) ZnSO4, (c) Pb(NO3)2, (d) CuSO4 ? Write balanced equations for these reactions.

Answer»

What do you observe when caustic soda solution is added to the following solution, first a little and then in excess:
(a) $F e C l_{3}$ ,

(b) $Z n S O_{4}$ ,
(c) $P b (N O_{3})_{2}$ ,

(d) $C u S O_{4}$ ?
Write balanced equations for these reactions.

Discussion

11530.	Question 26 Differentiate between biodegradable and non-biodegradable substances. Cite examples.
Answer» Question 26 Differentiate between biodegradable and non-biodegradable substances. Cite examples.

Discussion

11531.	What are the horizontal rows in the periodic table called?
Answer» What are the horizontal rows in the periodic table called?

Discussion

11532.	How many moles of molecules and atoms of sulphur are present in 0.1 mole of S8?
Answer» How many moles of molecules and atoms of sulphur are present in 0.1 mole of S₈?

Discussion

11533.	The shape of SO2−4 ion is ___ .
Answer» The shape of $S O_{4}^{2 -}$ ion is ___ .

Discussion

11534.	What type of chemical reaction takes place when ammonia and hydrogenchloride are mixed
Answer» What type of chemical reaction takes place when ammonia and hydrogenchloride are mixed

Discussion

11535.	Galvanisation is a method of protecting iron from rusting by coating with a thin layer of
Answer» Galvanisation is a method of protecting iron from rusting by coating with a thin layer of

Discussion

11536.	Which type of reaction is this: Na + 2H2O -----------> Na(OH)2 + H2
Answer» Which type of reaction is this: Na + 2H₂O -----------> Na(OH)₂+ H₂

11536.

Which type of reaction is this: Na + 2H2O -----------> Na(OH)2 + H2

Answer»

Which type of reaction is this:

Na + 2H₂O -----------> Na(OH)₂+ H₂

Discussion

11537.	Which of the following solution can be used to prepare 1 M solution of sodium hydroxide solution?
Answer» Which of the following solution can be used to prepare 1 M solution of sodium hydroxide solution?

Discussion

11538.	Which of the following pairs of compounds of carbon will undergo combustion as well as addition reactions?
Answer» Which of the following pairs of compounds of carbon will undergo combustion as well as addition reactions?

Discussion

11539.	What were the limitations of mendeleev's periodic Table and what were the major achievements of the same?
Answer» What were the limitations of mendeleev's periodic Table and what were the major achievements of the same?

Discussion

11540.	What is aqua regia? Give examples of metals that are soluble in aqua regia
Answer» What is aqua regia? Give examples of metals that are soluble in aqua regia

Discussion

11541.	How will you obtain FeCO3 by FeCl3?
Answer» How will you obtain $F e C O_{3}$ by $F e C l_{3}$ ?

Discussion

11542.	What is the IUPAC name of (CH3)2CHCH2CH2Br
Answer» What is the IUPAC name of (CH3)2CHCH2CH2Br

Discussion

11543.	Q64. Consider the following statements with reference to the Ethanol Blended Petrol Programme. 1. Upto 10% ethanol can be blended with petrol under the programme. 2. The procurement of ethanol produced from non-food feedstocks has been allowed. Select the correct answer using the codes given:
Answer» Q64. Consider the following statements with reference to the Ethanol Blended Petrol Programme. 1. Upto 10% ethanol can be blended with petrol under the programme. 2. The procurement of ethanol produced from non-food feedstocks has been allowed. Select the correct answer using the codes given:

11543.

Q64. Consider the following statements with reference to the Ethanol Blended Petrol Programme. 1. Upto 10% ethanol can be blended with petrol under the programme. 2. The procurement of ethanol produced from non-food feedstocks has been allowed. Select the correct answer using the codes given:

Answer»

Q64. Consider the following statements with reference to the Ethanol Blended Petrol Programme.

1. Upto 10% ethanol can be blended with petrol under the programme.

2. The procurement of ethanol produced from non-food feedstocks has been allowed.

Select the correct answer using the codes given:

Discussion

11544.	Explain why third period has eight and not eighteen elements
Answer» Explain why third period has eight and not eighteen elements

Discussion

11545.	CH2=CH2 + H2 → CH3-CH3 is an example of:
Answer» CH₂=CH₂ + H₂→ CH₃-CH₃is an example of:

Discussion

11546.	Out of the following options, select all the compounds that can change the colour of wet blue litmus paper into the red colour?
Answer» Out of the following options, select all the compounds that can change the colour of wet blue litmus paper into the red colour?

Discussion

11547.	(a) The table below compares some properties of metals and non-metals. Write down the missing statements (i) to (iv): MetalsNon−metals(i) ……Poor conductors of heat(ii) Malleable……(iii) Form positive ions……(iv) ……Form acidic oxides (b) How many valence electrons are present in: 1. Metals 2. Non - metals [5 MARKS]
Answer» (a) The table below compares some properties of metals and non-metals. Write down the missing statements (i) to (iv): $\begin{matrix} M e t a l s & N o n - m e t a l s (i) \dots \dots & P o o r c o n d u c t o r s o f h e a t (i i) M a l l e a b l e & \dots \dots (i i i) F o r m p o s i t i v e i o n s & \dots \dots (i v) \dots \dots & F o r m a c i d i c o x i d e s \end{matrix}$ (b) How many valence electrons are present in: 1. Metals 2. Non - metals [5 MARKS]

Discussion

11548.	The question refer to the following salt solutions listed (1) to (6). Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
Answer» The question refer to the following salt solutions listed (1) to (6). Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it?

11548.

The question refer to the following salt solutions listed (1) to (6). Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it?

Answer»

The question refer to the following salt solutions listed (1) to (6).

Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it?

Discussion

11549.	The number of coordinate covalent bonds in sulphuric acid molecules is
Answer» The number of coordinate covalent bonds in sulphuric acid molecules is

Discussion

11550.	What is/are the important source of ammonia?
Answer» What is/are the important source of ammonia?

Discussion

Explore topic-wise InterviewSolutions in .

Why the oxides of a high reactive metals cannot be reduced by carbon

The reaction of sodium metal is found to be highly explosive. Comment.

Why does Bee sting cause pain and irritation rubbing of baking soda on sting areas gives relief how

Why do you think the acidic stomach does not digest the stomach itself?

Atomic number is considered to be a more appropriate parameter than atomic mass for classification of elements in a periodic table. why? (5 marks)

When lead nitrate reacts with ammonium hydroxide, a chalky white precipitate is formed. The precipitate formed is insoluble in excess of ammonium hydroxide. Name this precipitate.

Which of the following gases is produced by burning Louisiana sulphur in the purified air?

In an endothermic process the solubility ________ with an increase in temperature.

Hydrogen chloride gas being highly soluble in water is dried by:

According to law of mass action, the rate of a chemical reaction is proportional to:

Copper carbonate is heated. The colour of its residue on cooling is

Question 21.1 Complete the missing components/variables given as x and y in the following reaction. Pb(NO3)2(aq)+2KI(aq)→PbI2(x)+2KNO3(y)

You have prepared a saturated solution of sugar at room temperature. Is it possible to dissolve some more grams of sugar to this solution? Justify your answer.

Write the full form of IUPAC. Name the elements represented by the following symbols : Au, Pb, Sn, Hg.

The reaction between red lead and hydrochloric acid is given below: Pb3O4+8HCLI→3PbCl2+4H2O+Cl2 calculate : (a) the amss fo lead chloride formed by the action of 6.85 g of red lead, (b) the mass fo chlorine and (c) the volume of chlorine evolved at STP.

In nature, aluminium is found in the form of compounds while gold is found in free state. Give reason.

What is the pH of a neutral solution ?

Why does the white loghl split into different colours when it passes through glass prism

Calculate the pressure exerted by 5 mol of CO2 in 1 L vessel at 47∘C using van der Waals equation. Also, calculate the pressure for an ideal gas. Given a=3.592 atm L2mol−2, b = 0.0427 L mol−1 .

The first member of p-block differs from remaining members of corresponding group because of:

CaOCl2 is the product of reaction between calcium hydroxide and ___ and is commonly called as ___.

An element 'X' has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of 'X'. Also write group number, period number and valency of 'X'.

Calculate the mass of CO2 produced by heating 20 g of pure limestone (CaCO3).

Some of the usage(s) of ethanol is/are:

What do you observe when caustic soda solution is added to the following solution, first a little and then in excess: (a) FeCl3, (b) ZnSO4, (c) Pb(NO3)2, (d) CuSO4 ? Write balanced equations for these reactions.

Question 26 Differentiate between biodegradable and non-biodegradable substances. Cite examples.

What are the horizontal rows in the periodic table called?

How many moles of molecules and atoms of sulphur are present in 0.1 mole of S8?

The shape of SO2−4 ion is ___ .

What type of chemical reaction takes place when ammonia and hydrogenchloride are mixed

Galvanisation is a method of protecting iron from rusting by coating with a thin layer of

Which type of reaction is this: Na + 2H2O -----------&gt; Na(OH)2 + H2

Which of the following solution can be used to prepare 1 M solution of sodium hydroxide solution?

Which of the following pairs of compounds of carbon will undergo combustion as well as addition reactions?

What were the limitations of mendeleev's periodic Table and what were the major achievements of the same?

What is aqua regia? Give examples of metals that are soluble in aqua regia

How will you obtain FeCO3 by FeCl3?

What is the IUPAC name of (CH3)2CHCH2CH2Br

Q64. Consider the following statements with reference to the Ethanol Blended Petrol Programme. 1. Upto 10% ethanol can be blended with petrol under the programme. 2. The procurement of ethanol produced from non-food feedstocks has been allowed. Select the correct answer using the codes given:

Explain why third period has eight and not eighteen elements

CH2=CH2 + H2 → CH3-CH3 is an example of:

Out of the following options, select all the compounds that can change the colour of wet blue litmus paper into the red colour?

The question refer to the following salt solutions listed (1) to (6). Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it?

The number of coordinate covalent bonds in sulphuric acid molecules is

What is/are the important source of ammonia?

CaOCl2 is the product of reaction between calcium hydroxide and _ and is commonly called as _.

Which type of reaction is this: Na + 2H2O -----------> Na(OH)2 + H2