7248 + Interview Questions in Chemistry Page 82 InterviewSolution

4051.	When magnesium ribbon reacts with air, heat and light is produced. The balanced chemical equation is:2Mg+O2→2MgOThe reactant(s) in the reaction is/are:
Answer» When magnesium ribbon reacts with air, heat and light is produced. The balanced chemical equation is: $2 Mg + O_{2} \to 2 MgO$ The reactant(s) in the reaction is/are:

4051.

When magnesium ribbon reacts with air, heat and light is produced. The balanced chemical equation is:2Mg+O2→2MgOThe reactant(s) in the reaction is/are:

Answer»

When magnesium ribbon reacts with air, heat and light is produced. The balanced chemical equation is:

$2 Mg + O_{2} \to 2 MgO$

The reactant(s) in the reaction is/are:

4052.	2. What is oxidation no. of Sulphur in hypo and Nitrogen in hypo nitrous acid?
Answer» 2. What is oxidation no. of Sulphur in hypo and Nitrogen in hypo nitrous acid?

Discussion

4053.	what are the differences between dispersed phase and dispersion medium
Answer» what are the differences between dispersed phase and dispersion medium

Discussion

4054.	Describe the different zones of a candle flame.
Answer» Describe the different zones of a candle flame.

Discussion

4055.	A gas is found to contain 2.34g of nitrogen and 5.34g of oxygen. What is the simplest formula of the compound?
Answer» A gas is found to contain 2.34g of nitrogen and 5.34g of oxygen. What is the simplest formula of the compound?

Discussion

4056.	Are SiC and dry ice both covalent solids ?
Answer» Are SiC and dry ice both covalent solids ?

Discussion

4057.	Which of the following type of coal is the hardest and consists of pure carbon?
Answer» Which of the following type of coal is the hardest and consists of pure carbon?

Discussion

4058.	what is atom and valence electrons?
Answer» what is atom and valence electrons?

Discussion

4059.	Question 4: What are the properties of gases? What are the conditions to compress a gas?
Answer» Question 4: What are the properties of gases? What are the conditions to compress a gas?

4059.

Question 4: What are the properties of gases? What are the conditions to compress a gas?

Answer»

Question 4:

What are the properties of gases?

What are the conditions to compress a gas?

Discussion

4060.	What do you mean by fossil fuel? Give two examples of fossil fuel. List the effects of pollution caused due to the burning of fossil fuels?
Answer» What do you mean by fossil fuel? Give two examples of fossil fuel. List the effects of pollution caused due to the burning of fossil fuels?

Discussion

4061.	Question 7The three R’s that will help us to conserve natural resources for long term use are(a) recycle, regenerate, reuse(b) reduce, regenerate, reuse(c) reduce, reuse, redistribute(d) reduce, recycle, reuse
Answer» Question 7 The three R’s that will help us to conserve natural resources for long term use are (a) recycle, regenerate, reuse (b) reduce, regenerate, reuse (c) reduce, reuse, redistribute (d) reduce, recycle, reuse

Discussion

4062.	Plants use CO2 for photosynthesis during the day . But at night , they also respire ,i.e.,take in O2 and release CO2 into the air . This doesn't help much in the reduction of CO2 . Then why do people ask to plant more trees ? Is there a more effective method to reduce CO2 in the air ?
Answer» Plants use CO₂ for photosynthesis during the day . But at night , they also respire ,i.e.,take in O₂ and release CO₂ into the air . This doesn't help much in the reduction of CO₂ . Then why do people ask to plant more trees ? Is there a more effective method to reduce CO₂ in the air ?

Discussion

4063.	Aluminium can be extracted from bauxite by which of the following process?
Answer» Aluminium can be extracted from bauxite by which of the following process?

Discussion

4064.	if we smear our hand with spirit or perfume, that portion becomes cold. Why?
Answer» if we smear our hand with spirit or perfume, that portion becomes cold. Why?

Discussion

4065.	Fe2O3+2Al→Al2O3+2FeThe above reaction is an example of a:
Answer» ${Fe}_{2} O_{3} + 2 Al \to {Al}_{2} O_{3} + 2 Fe$ The above reaction is an example of a:

Discussion

4066.	In Bohr's model of the atom, the orbits or shells are represented by the letters and numbers. Identify the correct statement.
Answer» In Bohr's model of the atom, the orbits or shells are represented by the letters and numbers. Identify the correct statement.

Discussion

4067.	What is the observation that can be made when calcium reacts with H2O?
Answer» What is the observation that can be made when calcium reacts with $H_{2} O$ ?

Discussion

4068.	39. Which one of the following is not a redox reaction? Why? 1.neutralization reaction 2.displacement reaction 3.combination reaction
Answer» 39. Which one of the following is not a redox reaction? Why? 1.neutralization reaction 2.displacement reaction 3.combination reaction

Discussion

4069.	Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.(a) How will she find the nature of the gas?
Answer» Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. (a) How will she find the nature of the gas?

Discussion

4070.	What about the electrons present in the gold atom? How will they react?
Answer» What about the electrons present in the gold atom? How will they react?

Discussion

4071.	The law of multiple proportions talk about mass whereas the law of definite proportion talks about weight, why?
Answer» The law of multiple proportions talk about mass whereas the law of definite proportion talks about weight, why?

Discussion

4072.	Which of the following is used to prepare hydrocarbons synthetically (Bergius process)?
Answer» Which of the following is used to prepare hydrocarbons synthetically (Bergius process)?

Discussion

4073.	54. The number of moles of aluminium sulphate which contains 1.44 x 10 to power 25 oxygen atom is
Answer» 54. The number of moles of aluminium sulphate which contains 1.44 x 10 to power 25 oxygen atom is

Discussion

4074.	why is carbon monoxide an element and not a compound?
Answer» why is carbon monoxide an element and not a compound?

Discussion

4075.	What is a bunsen burner?
Answer» What is a bunsen burner?

Discussion

4076.	22. What are the different values plank constant in cgs and si . Also give the value of it when no of moles is specified.
Answer» 22. What are the different values plank constant in cgs and si . Also give the value of it when no of moles is specified.

Discussion

4077.	When dry Hydrogen is burnt it forms water, by which of the following processes does water forms water droplets?
Answer» When dry Hydrogen is burnt it forms water, by which of the following processes does water forms water droplets?

Discussion

4078.	Will pairing occur in this compound [Co(ox)2(OH)2]- and [Co(NH3)5Cl]Cl2
Answer» Will pairing occur in this compound [Co(ox)2(OH)2]- and [Co(NH3)5Cl]Cl2

Discussion

4079.	Question 22Which among the following changes are exothermic or endothermic in nature?(a) Decomposition of ferrous sulphate(b) Dilution of sulphuric acid(c) Dissolution of sodium hydroxide in water(d) Dissolution of ammonium chloride in water
Answer» Question 22 Which among the following changes are exothermic or endothermic in nature? (a) Decomposition of ferrous sulphate (b) Dilution of sulphuric acid (c) Dissolution of sodium hydroxide in water (d) Dissolution of ammonium chloride in water

4079.

Question 22Which among the following changes are exothermic or endothermic in nature?(a) Decomposition of ferrous sulphate(b) Dilution of sulphuric acid(c) Dissolution of sodium hydroxide in water(d) Dissolution of ammonium chloride in water

Answer»

Question 22

Which among the following changes are exothermic or endothermic in nature?

(a) Decomposition of ferrous sulphate

(b) Dilution of sulphuric acid

(c) Dissolution of sodium hydroxide in water

(d) Dissolution of ammonium chloride in water

Discussion

4080.	Question 6: Explain the process of formation of petroleum. Name any three constituents of petroleum.
Answer» Question 6: Explain the process of formation of petroleum. Name any three constituents of petroleum.

4080.

Question 6: Explain the process of formation of petroleum. Name any three constituents of petroleum.

Answer»

Question 6:

Explain the process of formation of petroleum.

Name any three constituents of petroleum.

Discussion

4081.	How we can find the atomic number and mass number of an element? (like calcium).
Answer» How we can find the atomic number and mass number of an element? (like calcium).

Discussion

4082.	Question 8 Potable water is the water which is (a) Obtained from a river (b) Obtained from a lake (c) Pure and fit for drinking (d) used only for washing clothes
Answer» Question 8 Potable water is the water which is (a) Obtained from a river (b) Obtained from a lake (c) Pure and fit for drinking (d) used only for washing clothes

Discussion

4083.	What is hybridisation, geometry and shape of ICl3+ ?
Answer» What is hybridisation, geometry and shape of ICl3+ ?

Discussion

4084.	Which is the most preferred metal in the laboratory for preparation of hydrogen by the metal-acid reaction?
Answer» Which is the most preferred metal in the laboratory for preparation of hydrogen by the metal-acid reaction?

Discussion

4085.	Explain redox reactions based on electron transfer. Give suitable examples.
Answer» Explain redox reactions based on electron transfer. Give suitable examples.

Discussion

4086.	the eight amino acid differences between the human and monkey are
Answer» the eight amino acid differences between the human and monkey are

Discussion

4087.	Name two gases which are essential for the survival of aquatic animals and plants
Answer» Name two gases which are essential for the survival of aquatic animals and plants

Discussion

4088.	Question 10 Which of the following non-metals reacts and catches fire on exposure to air? (a) phosphorus (b) nitrogen (c) sulphur (d) hydrogen
Answer» Question 10 Which of the following non-metals reacts and catches fire on exposure to air? (a) phosphorus (b) nitrogen (c) sulphur (d) hydrogen

Discussion

4089.	Question 34Why do we store silver chloride in dark coloured bottles?
Answer» Question 34 Why do we store silver chloride in dark coloured bottles?

Discussion

4090.	Give reason for the following.a. Hydronium ions are always in the form H3 O+b. Buttermilk spoils if kept in a copper or brass container.
Answer» Give reason for the following. a. Hydronium ions are always in the form H₃O⁺ b. Buttermilk spoils if kept in a copper or brass container.

Discussion

4091.	Question 16 Fill in the blanks in the following sentences. (a) A ____________ process in which a substance reacts with __________ to give off heat is called combustion. (b) When the clothes of a person catch __________, the person is covered with a __________ to extinguish fire. (c) The __________ temperature at which a substance catches fire is called its ignition temperature. (d) The substances which have very ________________ ignition temperature and can easily catch fire with a flame are called __________ substances. (e) The substances which vapourise during __________, give flame.
Answer» Question 16 Fill in the blanks in the following sentences. (a) A ____________ process in which a substance reacts with __________ to give off heat is called combustion. (b) When the clothes of a person catch __________, the person is covered with a __________ to extinguish fire. (c) The __________ temperature at which a substance catches fire is called its ignition temperature. (d) The substances which have very ________________ ignition temperature and can easily catch fire with a flame are called __________ substances. (e) The substances which vapourise during __________, give flame.

Discussion

4092.	Some properties are listed in the following table. Distinguish between metals and non-metals on the basis of these properties.PropertiesMetalsNon−metals1. Appearance2. Hardness3. Malleability4. Ductility5. Heat Conduction6. Conduction of Electricity
Answer» Some properties are listed in the following table. Distinguish between metals and non-metals on the basis of these properties. $\begin{matrix} P r o p e r t i e s & M e t a l s & N o n - m e t a l s 1. A p p e a r a n c e 2. H a r d n e s s 3. M a l l e a b i l i t y 4. D u c t i l i t y 5. H e a t C o n d u c t i o n 6. C o n d u c t i o n o f E l e c t r i c i t y \end{matrix}$

Discussion

4093.	37. Calculate the number of gold atoms in 300mg of a gold ring of 20 carat gold given the atomic mass of gold=197and pure gold is 24 carat
Answer» 37. Calculate the number of gold atoms in 300mg of a gold ring of 20 carat gold given the atomic mass of gold=197and pure gold is 24 carat

Discussion

4094.	In which molecule are all atoms coplanar
Answer» In which molecule are all atoms coplanar

4094.

In which molecule are all atoms coplanar

Answer»

In which molecule are all atoms coplanar

Discussion

4095.	Which metal has been used to make the wires shown in the picture?
Answer» Which metal has been used to make the wires shown in the picture?

4095.

Which metal has been used to make the wires shown in the picture?

Answer»

Which metal has been used to make the wires shown in the picture?

Discussion

4096.	Question 1Why should curd and sour substances not be kept in brass and copper vessels?
Answer» Question 1 Why should curd and sour substances not be kept in brass and copper vessels?

Discussion

4097.	Identify the term that is generally used to express the quality of a gasoline.
Answer» Identify the term that is generally used to express the quality of a gasoline.

Discussion

4098.	Question 6:What are the two essential conditions for rusting?
Answer» Question 6: What are the two essential conditions for rusting?

Discussion

4099.	What is metallurgy?
Answer» What is metallurgy?

Discussion

4100.	Change in which of the following physical properties can transform matter from one state to another?
Answer» Change in which of the following physical properties can transform matter from one state to another?

Discussion

Explore topic-wise InterviewSolutions in .

When magnesium ribbon reacts with air, heat and light is produced. The balanced chemical equation is:2Mg+O2→2MgOThe reactant(s) in the reaction is/are:

2. What is oxidation no. of Sulphur in hypo and Nitrogen in hypo nitrous acid?

what are the differences between dispersed phase and dispersion medium

Describe the different zones of a candle flame.

A gas is found to contain 2.34g of nitrogen and 5.34g of oxygen. What is the simplest formula of the compound?

Are SiC and dry ice both covalent solids ?

Which of the following type of coal is the hardest and consists of pure carbon?

what is atom and valence electrons?

Question 4: What are the properties of gases? What are the conditions to compress a gas?

What do you mean by fossil fuel? Give two examples of fossil fuel. List the effects of pollution caused due to the burning of fossil fuels?

Question 7The three R’s that will help us to conserve natural resources for long term use are(a) recycle, regenerate, reuse(b) reduce, regenerate, reuse(c) reduce, reuse, redistribute(d) reduce, recycle, reuse

Aluminium can be extracted from bauxite by which of the following process?

if we smear our hand with spirit or perfume, that portion becomes cold. Why?

Fe2O3+2Al→Al2O3+2FeThe above reaction is an example of a:

In Bohr's model of the atom, the orbits or shells are represented by the letters and numbers. Identify the correct statement.

What is the observation that can be made when calcium reacts with H2O?

39. Which one of the following is not a redox reaction? Why? 1.neutralization reaction 2.displacement reaction 3.combination reaction

Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.(a) How will she find the nature of the gas?

What about the electrons present in the gold atom? How will they react?

The law of multiple proportions talk about mass whereas the law of definite proportion talks about weight, why?

Which of the following is used to prepare hydrocarbons synthetically (Bergius process)?

54. The number of moles of aluminium sulphate which contains 1.44 x 10 to power 25 oxygen atom is

why is carbon monoxide an element and not a compound?

What is a bunsen burner?

22. What are the different values plank constant in cgs and si . Also give the value of it when no of moles is specified.

When dry Hydrogen is burnt it forms water, by which of the following processes does water forms water droplets?

Will pairing occur in this compound [Co(ox)2(OH)2]- and [Co(NH3)5Cl]Cl2

Question 22Which among the following changes are exothermic or endothermic in nature?(a) Decomposition of ferrous sulphate(b) Dilution of sulphuric acid(c) Dissolution of sodium hydroxide in water(d) Dissolution of ammonium chloride in water

Question 6: Explain the process of formation of petroleum. Name any three constituents of petroleum.

How we can find the atomic number and mass number of an element? (like calcium).

Question 8 Potable water is the water which is (a) Obtained from a river (b) Obtained from a lake (c) Pure and fit for drinking (d) used only for washing clothes

What is hybridisation, geometry and shape of ICl3+ ?

Which is the most preferred metal in the laboratory for preparation of hydrogen by the metal-acid reaction?

Explain redox reactions based on electron transfer. Give suitable examples.

the eight amino acid differences between the human and monkey are

Name two gases which are essential for the survival of aquatic animals and plants

Question 10 Which of the following non-metals reacts and catches fire on exposure to air? (a) phosphorus (b) nitrogen (c) sulphur (d) hydrogen

Question 34Why do we store silver chloride in dark coloured bottles?

Give reason for the following.a. Hydronium ions are always in the form H3 O+b. Buttermilk spoils if kept in a copper or brass container.

Some properties are listed in the following table. Distinguish between metals and non-metals on the basis of these properties.PropertiesMetalsNon−metals1. Appearance2. Hardness3. Malleability4. Ductility5. Heat Conduction6. Conduction of Electricity

37. Calculate the number of gold atoms in 300mg of a gold ring of 20 carat gold given the atomic mass of gold=197and pure gold is 24 carat

In which molecule are all atoms coplanar

Which metal has been used to make the wires shown in the picture?

Question 1Why should curd and sour substances not be kept in brass and copper vessels?

Identify the term that is generally used to express the quality of a gasoline.

Question 6:What are the two essential conditions for rusting?

What is metallurgy?

Change in which of the following physical properties can transform matter from one state to another?