5083 + Interview Questions in Chemistry Page 34 InterviewSolution

1651.	What is fibre
Answer» What is fibre

Discussion

1652.	Take three test tubes and label it as A, B and C. Fill 34th of each with water. Keep a snail in test tube A, a water plant in test tube B and in C, keep both snail and plant. In which of these test tubes CO2 (carbon dioxide) level will be higher? [5 MARKS]
Answer» Take three test tubes and label it as A, B and C. Fill $\frac{3}{4}$ th of each with water. Keep a snail in test tube A, a water plant in test tube B and in C, keep both snail and plant. In which of these test tubes $C O_{2}$ (carbon dioxide) level will be higher? [5 MARKS]

Discussion

1653.	a binary solid AB has NaCl type of structure, if all the ions are removed from one of the body diagonal planes then new formula becomes?
Answer» a binary solid AB has NaCl type of structure, if all the ions are removed from one of the body diagonal planes then new formula becomes?

Discussion

1654.	Which of the following is correct, where water is not found on the surface?
Answer» Which of the following is correct, where water is not found on the surface?

Discussion

1655.	State four important characteristics of compounds.
Answer» State four important characteristics of compounds.

Discussion

1656.	___dissolved in water helps in photosynthesis of aquatic plants.
Answer» ___dissolved in water helps in photosynthesis of aquatic plants.

Discussion

1657.	Appu’s father plans on opening an Anthurium flower farm. He read that Anthurium plants require soils with good water absorption capacity along with good aeration. He has three choices: Clayey soil, Sandy Loam soil and coco peat (an artificial soil made from coconut husks). He took 50 g of each soil and determined the volume of water it absorbed. He also determined the soil particle size using a microscope and tabulated the results.Soil TypeVolume of water absorbed by 50g of soilParticle sizeClayey35 ml0.002 mmSandy Loam15 ml1 mmCoco Peat350 ml1 mmWhich soil should Appu’s father choose?
Answer» Appu’s father plans on opening an Anthurium flower farm. He read that Anthurium plants require soils with good water absorption capacity along with good aeration. He has three choices: Clayey soil, Sandy Loam soil and coco peat (an artificial soil made from coconut husks). He took 50 g of each soil and determined the volume of water it absorbed. He also determined the soil particle size using a microscope and tabulated the results. $\begin{matrix} Soil Type & Volume of water absorbed by 50g of soil & Particle size Clayey & 35 ml & 0.002 mm Sandy Loam & 15 ml & 1 mm Coco Peat & 350 ml & 1 mm \end{matrix}$ Which soil should Appu’s father choose?

1657.

Appu’s father plans on opening an Anthurium flower farm. He read that Anthurium plants require soils with good water absorption capacity along with good aeration. He has three choices: Clayey soil, Sandy Loam soil and coco peat (an artificial soil made from coconut husks). He took 50 g of each soil and determined the volume of water it absorbed. He also determined the soil particle size using a microscope and tabulated the results.Soil TypeVolume of water absorbed by 50g of soilParticle sizeClayey35 ml0.002 mmSandy Loam15 ml1 mmCoco Peat350 ml1 mmWhich soil should Appu’s father choose?

Answer»

Appu’s father plans on opening an Anthurium flower farm. He read that Anthurium plants require soils with good water absorption capacity along with good aeration. He has three choices: Clayey soil, Sandy Loam soil and coco peat (an artificial soil made from coconut husks). He took 50 g of each soil and determined the volume of water it absorbed. He also determined the soil particle size using a microscope and tabulated the results.

$\begin{matrix} Soil Type & Volume of water absorbed by 50g of soil & Particle size Clayey & 35 ml & 0.002 mm Sandy Loam & 15 ml & 1 mm Coco Peat & 350 ml & 1 mm \end{matrix}$

Which soil should Appu’s father choose?

Discussion

1658.	Distinguish between metals and nonmetals on the basis of the properties given below: Hardness Conductivity Density
Answer» Distinguish between metals and nonmetals on the basis of the properties given below: Hardness Conductivity Density

1658.

Distinguish between metals and nonmetals on the basis of the properties given below: Hardness Conductivity Density

Answer»

Distinguish between metals and nonmetals on the basis of the properties given below:

Hardness

Conductivity

Density

Discussion

1659.	Which of the following places will have more chances of flooding during heavy rainfall?
Answer» Which of the following places will have more chances of flooding during heavy rainfall?

Discussion

1660.	Question 2Name the technique to separate (a) butter from curd, (b) salt from sea-water, (c) camphor from salt
Answer» Question 2 Name the technique to separate (a) butter from curd, (b) salt from sea-water, (c) camphor from salt

Discussion

1661.	0.63 g of a dibasic acid is available in 100 ml solution.20 ml of this solution required 20 ml of N/10 NaOH solution for complete neutralization. Themolar mass of the acid is
Answer» 0.63 g of a dibasic acid is available in 100 ml solution.20 ml of this solution required 20 ml of N/10 NaOH solution for complete neutralization. Themolar mass of the acid is

Discussion

1662.	Which among the following is/are the different characteristics of anode rays?
Answer» Which among the following is/are the different characteristics of anode rays?

Discussion

1663.	Q2. Consider the following statements about World Water Day: 1. The theme for World Water Day 2018 is ‘Nature for Water’ – exploring nature-based solutions to the water challenges. 2. Sustainable Development Goal commits the world to ensuring that everyone has access to safe water by 2030. Which of the above statements are correct?
Answer» Q2. Consider the following statements about World Water Day: 1. The theme for World Water Day 2018 is ‘Nature for Water’ – exploring nature-based solutions to the water challenges. 2. Sustainable Development Goal commits the world to ensuring that everyone has access to safe water by 2030. Which of the above statements are correct?

1663.

Q2. Consider the following statements about World Water Day: 1. The theme for World Water Day 2018 is ‘Nature for Water’ – exploring nature-based solutions to the water challenges. 2. Sustainable Development Goal commits the world to ensuring that everyone has access to safe water by 2030. Which of the above statements are correct?

Answer»

Q2. Consider the following statements about World Water Day:

1. The theme for World Water Day 2018 is ‘Nature for Water’ – exploring nature-based solutions to the water challenges.

2. Sustainable Development Goal commits the world to ensuring that everyone has access to safe water by 2030.

Which of the above statements are correct?

Discussion

1664.	Question 3Boojho wishes to contribute in reducing air pollution. Which vehicle should he use for going to school?(a) Car(b) School bus(c) Autorickshaw(d) Scooter
Answer» Question 3 Boojho wishes to contribute in reducing air pollution. Which vehicle should he use for going to school? (a) Car (b) School bus (c) Autorickshaw (d) Scooter

Discussion

1665.	Classify each of the following reactions as combination, decomposition, displacement or double displacement reaction. [5 MARKS] BaCl2+H2SO4→BaSO4+2HCl CaO+CO2→CaCO3 CaCO3→CaO+CO2 2KI+Cl2→2KCl+I2 2H2O→2H2+O2
Answer» Classify each of the following reactions as combination, decomposition, displacement or double displacement reaction. [5 MARKS] ${BaCl}_{2} + H_{2} {SO}_{4} \to {BaSO}_{4} + 2 HCl$ $CaO + {CO}_{2} \to {CaCO}_{3}$ ${CaCO}_{3} \to CaO + {CO}_{2}$ $2 KI + {Cl}_{2} \to 2 KCl + I_{2}$ $2 H_{2} O \to 2 H_{2} + O_{2}$

1665.

Classify each of the following reactions as combination, decomposition, displacement or double displacement reaction. [5 MARKS] BaCl2+H2SO4→BaSO4+2HCl CaO+CO2→CaCO3 CaCO3→CaO+CO2 2KI+Cl2→2KCl+I2 2H2O→2H2+O2

Answer»

Classify each of the following reactions as combination, decomposition, displacement or double displacement reaction. [5 MARKS]

${BaCl}_{2} + H_{2} {SO}_{4} \to {BaSO}_{4} + 2 HCl$
$CaO + {CO}_{2} \to {CaCO}_{3}$
${CaCO}_{3} \to CaO + {CO}_{2}$
$2 KI + {Cl}_{2} \to 2 KCl + I_{2}$
$2 H_{2} O \to 2 H_{2} + O_{2}$

Discussion

1666.	lithium crystallizes in the body-centered structure with an edge length a of 350pm what is the minimum distance between two li atoms?
Answer» lithium crystallizes in the body-centered structure with an edge length a of 350pm what is the minimum distance between two li atoms?

Discussion

1667.	Write down the conclusions drawn by E. Rutherford from his alpha-ray scattering experiment.
Answer» Write down the conclusions drawn by E. Rutherford from his alpha-ray scattering experiment.

Discussion

1668.	Arjun was hungry and he decided to cut many apples. After cutting, he just had one slice and left the rest on the table. When he came back he found that the exposed surface had turned dirty brown. What could be the possible reason for this? And which kind of change is this? [2 MARKS]
Answer» Arjun was hungry and he decided to cut many apples. After cutting, he just had one slice and left the rest on the table. When he came back he found that the exposed surface had turned dirty brown. What could be the possible reason for this? And which kind of change is this? [2 MARKS]

Discussion

1669.	Diarrhoea is a/an _______ disease.
Answer» Diarrhoea is a/an _______ disease.

Discussion

1670.	What is the relation between electric conductance of an electrolyte and the area of an electrode?
Answer» What is the relation between electric conductance of an electrolyte and the area of an electrode?

Discussion

1671.	In the electrolytic cell, flow of electrons is fron:
Answer» In the electrolytic cell, flow of electrons is fron:

Discussion

1672.	Paragraph for below questionनीचे दिये गये प्रश्न के लिए अनुच्छेदAccording to the quantum mechanical model of atom, the electronic distribution of an atom containing a number of electrons is divided into shells. The shells, in turn are thought to consist of one or more subshells and subshells are assumed to be composed of one or more orbitals, which the electrons occupy. The electrons are filled in those orbitals in order of increasing energy in accordance with Pauli exclusion principle and Hund’s rule of maximum multiplicity.परमाणु के क्वांटम यांत्रिकी प्रतिरूप के अनुसार, बहु इलेक्ट्रॉनों वाले परमाणु में इलेक्ट्रॉनीय वितरण कोशों में विभाजित होता है। यह माना जाता है कि कोश एक या अधिक उपकोशों से बने होते हैं तथा उपकोश एक या अधिक कक्षकों से बने होते हैं जिनमें इलेक्ट्रॉन ग्रहण किए जाते हैं। इलेक्ट्रॉन उन कक्षकों में भरे जाते हैं जो पाउली के अपवर्जन सिद्धान्त तथा हुण्ड की अधिकतम बहुलकता के अनुसार ऊर्जा के बढ़ते क्रम में हों।Q. In which of the following orbital diagram, both Hund’s rule and Pauli’s exclusion principle are violated?प्रश्न - निम्नलिखित में से किस कक्षकीय आरेख में, हुण्ड के नियम तथा पाउली के अपवर्जन सिद्धान्त दोनों का उल्लंघन होता है?
Answer» Paragraph for below question नीचे दिये गये प्रश्न के लिए अनुच्छेद According to the quantum mechanical model of atom, the electronic distribution of an atom containing a number of electrons is divided into shells. The shells, in turn are thought to consist of one or more subshells and subshells are assumed to be composed of one or more orbitals, which the electrons occupy. The electrons are filled in those orbitals in order of increasing energy in accordance with Pauli exclusion principle and Hund’s rule of maximum multiplicity. परमाणु के क्वांटम यांत्रिकी प्रतिरूप के अनुसार, बहु इलेक्ट्रॉनों वाले परमाणु में इलेक्ट्रॉनीय वितरण कोशों में विभाजित होता है। यह माना जाता है कि कोश एक या अधिक उपकोशों से बने होते हैं तथा उपकोश एक या अधिक कक्षकों से बने होते हैं जिनमें इलेक्ट्रॉन ग्रहण किए जाते हैं। इलेक्ट्रॉन उन कक्षकों में भरे जाते हैं जो पाउली के अपवर्जन सिद्धान्त तथा हुण्ड की अधिकतम बहुलकता के अनुसार ऊर्जा के बढ़ते क्रम में हों। Q. In which of the following orbital diagram, both Hund’s rule and Pauli’s exclusion principle are violated? प्रश्न - निम्नलिखित में से किस कक्षकीय आरेख में, हुण्ड के नियम तथा पाउली के अपवर्जन सिद्धान्त दोनों का उल्लंघन होता है?

1672.

Paragraph for below questionनीचे दिये गये प्रश्न के लिए अनुच्छेदAccording to the quantum mechanical model of atom, the electronic distribution of an atom containing a number of electrons is divided into shells. The shells, in turn are thought to consist of one or more subshells and subshells are assumed to be composed of one or more orbitals, which the electrons occupy. The electrons are filled in those orbitals in order of increasing energy in accordance with Pauli exclusion principle and Hund’s rule of maximum multiplicity.परमाणु के क्वांटम यांत्रिकी प्रतिरूप के अनुसार, बहु इलेक्ट्रॉनों वाले परमाणु में इलेक्ट्रॉनीय वितरण कोशों में विभाजित होता है। यह माना जाता है कि कोश एक या अधिक उपकोशों से बने होते हैं तथा उपकोश एक या अधिक कक्षकों से बने होते हैं जिनमें इलेक्ट्रॉन ग्रहण किए जाते हैं। इलेक्ट्रॉन उन कक्षकों में भरे जाते हैं जो पाउली के अपवर्जन सिद्धान्त तथा हुण्ड की अधिकतम बहुलकता के अनुसार ऊर्जा के बढ़ते क्रम में हों।Q. In which of the following orbital diagram, both Hund’s rule and Pauli’s exclusion principle are violated?प्रश्न - निम्नलिखित में से किस कक्षकीय आरेख में, हुण्ड के नियम तथा पाउली के अपवर्जन सिद्धान्त दोनों का उल्लंघन होता है?

Answer»

Paragraph for below question

नीचे दिये गये प्रश्न के लिए अनुच्छेद

According to the quantum mechanical model of atom, the electronic distribution of an atom containing a number of electrons is divided into shells. The shells, in turn are thought to consist of one or more subshells and subshells are assumed to be composed of one or more orbitals, which the electrons occupy. The electrons are filled in those orbitals in order of increasing energy in accordance with Pauli exclusion principle and Hund’s rule of maximum multiplicity.

परमाणु के क्वांटम यांत्रिकी प्रतिरूप के अनुसार, बहु इलेक्ट्रॉनों वाले परमाणु में इलेक्ट्रॉनीय वितरण कोशों में विभाजित होता है। यह माना जाता है कि कोश एक या अधिक उपकोशों से बने होते हैं तथा उपकोश एक या अधिक कक्षकों से बने होते हैं जिनमें इलेक्ट्रॉन ग्रहण किए जाते हैं। इलेक्ट्रॉन उन कक्षकों में भरे जाते हैं जो पाउली के अपवर्जन सिद्धान्त तथा हुण्ड की अधिकतम बहुलकता के अनुसार ऊर्जा के बढ़ते क्रम में हों।

Q. In which of the following orbital diagram, both Hund’s rule and Pauli’s exclusion principle are violated?

प्रश्न - निम्नलिखित में से किस कक्षकीय आरेख में, हुण्ड के नियम तथा पाउली के अपवर्जन सिद्धान्त दोनों का उल्लंघन होता है?

Discussion

1673.	Minerals like Calcium and Potasium are held over the surface of clay particles because these are
Answer» Minerals like Calcium and Potasium are held over the surface of clay particles because these are

Discussion

1674.	stainless steel can be classified as a ___ .
Answer» stainless steel can be classified as a ___ .

Discussion

1675.	27. Why Pauli's exclusion principle is not applicable to photons?
Answer» 27. Why Pauli's exclusion principle is not applicable to photons?

Discussion

1676.	Which of the following soils has the highest water retention capacity?
Answer» Which of the following soils has the highest water retention capacity?

Discussion

1677.	What are the properties of acrylic fibres?
Answer» What are the properties of acrylic fibres?

Discussion

1678.	What change took place when the magnesium wire burned?
Answer» What change took place when the magnesium wire burned?

Discussion

1679.	What are the acids are present in tea and spinach
Answer» What are the acids are present in tea and spinach

Discussion

1680.	What is atomicity? Give an example each of monoatomic, diatomic, triatomic and octatomic molecule.
Answer» What is atomicity? Give an example each of monoatomic, diatomic, triatomic and octatomic molecule.

Discussion

1681.	Question 10.Sodium hydrogen carbonate, when added to acetic acid, evolves a gas. Which of the following statements are true about the gas evolved?(i) It turns lime water milky(ii) It extinguishes a burning splinter(iii) It dissolves in a solution of sodium hydroxide(iv) It has a pungent odour(a) (i) and (ii)(b) (i), (ii) and (iii)(c) (ii), (iii) and (iv)(d) (i) and (iv)
Answer» Question 10. Sodium hydrogen carbonate, when added to acetic acid, evolves a gas. Which of the following statements are true about the gas evolved? (i) It turns lime water milky (ii) It extinguishes a burning splinter (iii) It dissolves in a solution of sodium hydroxide (iv) It has a pungent odour (a) (i) and (ii) (b) (i), (ii) and (iii) (c) (ii), (iii) and (iv) (d) (i) and (iv)

Discussion

1682.	To prevent tooth decay, one is advised to brush the teeth regularly. The ingredient of the paste which checks tooth decay is:
Answer» To prevent tooth decay, one is advised to brush the teeth regularly. The ingredient of the paste which checks tooth decay is:

Discussion

1683.	Write down the formulae of the following compounds: (i) Potassium oxide (ii) aluminium Nitride (iii) Hydrogen sulfide (iv) Calcium hydroxide
Answer» Write down the formulae of the following compounds: (i) Potassium oxide (ii) aluminium Nitride (iii) Hydrogen sulfide (iv) Calcium hydroxide

Discussion

1684.	Why is sulphuric acid called the king of all acid
Answer» Why is sulphuric acid called the king of all acid

Discussion

1685.	Fit the given words correctly in the given blanks. state, shape, and composition.1) Moulding of clay involves change in_______.2) Burning of wood involves change in_______.3) Melting of ice involves change in________.
Answer» Fit the given words correctly in the given blanks. state, shape, and composition. 1) Moulding of clay involves change in_______. 2) Burning of wood involves change in_______. 3) Melting of ice involves change in________.

Discussion

1686.	1. What is terrestrial hydrogen?2. What do we get when we get when we mix zinc with sulphuric acid during preparation of hydrogen in laboratory ?3.what is difference between diluted and concentrated solution?4. Why pure zinc is not used in the preparation of dihydrogen?5. Difference between electron affinityand electronegativity?
Answer» 1. What is terrestrial hydrogen? 2. What do we get when we get when we mix zinc with sulphuric acid during preparation of hydrogen in laboratory ? 3.what is difference between diluted and concentrated solution? 4. Why pure zinc is not used in the preparation of dihydrogen? 5. Difference between electron affinity and electronegativity?

Discussion

1687.	19. In the electrolysis of CuSO4 solution .How many grams of cu are placed out on the cathode in the time that it takes to liberate 5.6gm of O2(g) measured at STP at the anode? 1)31.75 2)14.2 3)4.32 4)25.2
Answer» 19. In the electrolysis of CuSO4 solution .How many grams of cu are placed out on the cathode in the time that it takes to liberate 5.6gm of O2(g) measured at STP at the anode? 1)31.75 2)14.2 3)4.32 4)25.2

Discussion

1688.	Describe the process of making soap in brief.
Answer» Describe the process of making soap in brief.

Discussion

1689.	Find the emf of the given cell.Ni(s)\|Ni2+(aq, 1.0 M)\|\|Au3+(aq, 0.1 M)\|Au(s)[E0 for Ni2+/Ni=−0.25 VE0 for Au3+/Au=1.50 V]
Answer» Find the emf of the given cell. $N i (s) \| N i^{2 +} (a q, 1.0 M) \| \| A u^{3 +} (a q, 0.1 M) \| A u (s)$ $[E^{0} for N i^{2 +} / N i = - 0.25 V$ $E^{0} for A u^{3 +} / A u = 1.50 V]$

Discussion

1690.	Which of the following should be done to control fire?
Answer» Which of the following should be done to control fire?

Discussion

1691.	Water in a †an k is frozen completely. The height and mass of frozen water is 10cm and 1kg respectively. When the entire ice melts, the work done by gravity is (specific gravity of ice=0.9
Answer» Water in a †an k is frozen completely. The height and mass of frozen water is 10cm and 1kg respectively. When the entire ice melts, the work done by gravity is (specific gravity of ice=0.9

Discussion

1692.	100 ml of 3 mol H,SO, reacts with 100 ml of 3 molNAOH. Enthalpy of neutralisation of reaction will be
Answer» 100 ml of 3 mol H,SO, reacts with 100 ml of 3 molNAOH. Enthalpy of neutralisation of reaction will be

Discussion

1693.	22 Explain coordination position isomerism
Answer» 22 Explain coordination position isomerism

Discussion

1694.	Name the operation (shown in the figure) involved during the purification of water to obtain an adequate quantity of potable water.
Answer» Name the operation (shown in the figure) involved during the purification of water to obtain an adequate quantity of potable water.

1694.

Name the operation (shown in the figure) involved during the purification of water to obtain an adequate quantity of potable water.

Answer»

Name the operation (shown in the figure) involved during the purification of water to obtain an adequate quantity of potable water.

Discussion

1695.	Matter is made of atom. Atom is made of electrons,protons and neutrons. Then electron,proton,neutron are made of???
Answer» Matter is made of atom. Atom is made of electrons,protons and neutrons. Then electron,proton,neutron are made of???

Discussion

1696.	We see the sun's light is bright colour as White colour but when we light a candle it gives a yellowish colour .So,what is present in a candle which gives a yellowish colour instead of a awhite colour as sun has?
Answer» We see the sun's light is bright colour as White colour but when we light a candle it gives a yellowish colour .So,what is present in a candle which gives a yellowish colour instead of a awhite colour as sun has?

Discussion

1697.	the temperature of 170 gram of water at 50 degree celsius is lowered 25 degree Celsius by adding certain amount of ice to it find the mass of ice added.Given, specific heat capacity of water is equal to 4200 joule per gram specific latent heat of ice is equal to 336000 joule per gram.
Answer» the temperature of 170 gram of water at 50 degree celsius is lowered 25 degree Celsius by adding certain amount of ice to it find the mass of ice added. Given, specific heat capacity of water is equal to 4200 joule per gram specific latent heat of ice is equal to 336000 joule per gram.

Discussion

1698.	68.The half life of a radioactive isotope x is 20 years.It decays to another element y which is stable.X and Y were found to be in the ratio 1:7 in a given sample of rock.The estimated age of the rock a)60 b)80 c)100 d)40
Answer» 68.The half life of a radioactive isotope x is 20 years.It decays to another element y which is stable.X and Y were found to be in the ratio 1:7 in a given sample of rock.The estimated age of the rock a)60 b)80 c)100 d)40

Discussion

1699.	Name two conditions which are essential for rusting. Write the chemical equation for rusting of Iron. [2 MARKS]
Answer» Name two conditions which are essential for rusting. Write the chemical equation for rusting of Iron. [2 MARKS]

Discussion

1700.	10. Why the H^+concentration of water is added to acid when it's concentration is less than 10^{-6}.?
Answer» 10. Why the H^+concentration of water is added to acid when it's concentration is less than 10^{-6}.?

Discussion

Explore topic-wise InterviewSolutions in .

What is fibre

Take three test tubes and label it as A, B and C. Fill 34th of each with water. Keep a snail in test tube A, a water plant in test tube B and in C, keep both snail and plant. In which of these test tubes CO2 (carbon dioxide) level will be higher? [5 MARKS]

a binary solid AB has NaCl type of structure, if all the ions are removed from one of the body diagonal planes then new formula becomes?

Which of the following is correct, where water is not found on the surface?

State four important characteristics of compounds.

___dissolved in water helps in photosynthesis of aquatic plants.

Distinguish between metals and nonmetals on the basis of the properties given below: Hardness Conductivity Density

Which of the following places will have more chances of flooding during heavy rainfall?

Question 2Name the technique to separate (a) butter from curd, (b) salt from sea-water, (c) camphor from salt

0.63 g of a dibasic acid is available in 100 ml solution.20 ml of this solution required 20 ml of N/10 NaOH solution for complete neutralization. Themolar mass of the acid is

Which among the following is/are the different characteristics of anode rays?

Question 3Boojho wishes to contribute in reducing air pollution. Which vehicle should he use for going to school?(a) Car(b) School bus(c) Autorickshaw(d) Scooter

Classify each of the following reactions as combination, decomposition, displacement or double displacement reaction. [5 MARKS] BaCl2+H2SO4→BaSO4+2HCl CaO+CO2→CaCO3 CaCO3→CaO+CO2 2KI+Cl2→2KCl+I2 2H2O→2H2+O2

lithium crystallizes in the body-centered structure with an edge length a of 350pm what is the minimum distance between two li atoms?

Write down the conclusions drawn by E. Rutherford from his alpha-ray scattering experiment.

Arjun was hungry and he decided to cut many apples. After cutting, he just had one slice and left the rest on the table. When he came back he found that the exposed surface had turned dirty brown. What could be the possible reason for this? And which kind of change is this? [2 MARKS]

Diarrhoea is a/an _______ disease.

What is the relation between electric conductance of an electrolyte and the area of an electrode?

In the electrolytic cell, flow of electrons is fron:

Minerals like Calcium and Potasium are held over the surface of clay particles because these are

stainless steel can be classified as a ___ .

27. Why Pauli's exclusion principle is not applicable to photons?

Which of the following soils has the highest water retention capacity?

What are the properties of acrylic fibres?

What change took place when the magnesium wire burned?

What are the acids are present in tea and spinach

What is atomicity? Give an example each of monoatomic, diatomic, triatomic and octatomic molecule.

To prevent tooth decay, one is advised to brush the teeth regularly. The ingredient of the paste which checks tooth decay is:

Write down the formulae of the following compounds: (i) Potassium oxide (ii) aluminium Nitride (iii) Hydrogen sulfide (iv) Calcium hydroxide

Why is sulphuric acid called the king of all acid

Fit the given words correctly in the given blanks. state, shape, and composition.1) Moulding of clay involves change in_______.2) Burning of wood involves change in_______.3) Melting of ice involves change in________.

19. In the electrolysis of CuSO4 solution .How many grams of cu are placed out on the cathode in the time that it takes to liberate 5.6gm of O2(g) measured at STP at the anode? 1)31.75 2)14.2 3)4.32 4)25.2

Describe the process of making soap in brief.

Find the emf of the given cell.Ni(s)|Ni2+(aq, 1.0 M)||Au3+(aq, 0.1 M)|Au(s)[E0 for Ni2+/Ni=−0.25 VE0 for Au3+/Au=1.50 V]

Which of the following should be done to control fire?

Water in a †an k is frozen completely. The height and mass of frozen water is 10cm and 1kg respectively. When the entire ice melts, the work done by gravity is (specific gravity of ice=0.9

100 ml of 3 mol H,SO, reacts with 100 ml of 3 molNAOH. Enthalpy of neutralisation of reaction will be

22 Explain coordination position isomerism

Name the operation (shown in the figure) involved during the purification of water to obtain an adequate quantity of potable water. ​​

Matter is made of atom. Atom is made of electrons,protons and neutrons. Then electron,proton,neutron are made of???

We see the sun's light is bright colour as White colour but when we light a candle it gives a yellowish colour .So,what is present in a candle which gives a yellowish colour instead of a awhite colour as sun has?

the temperature of 170 gram of water at 50 degree celsius is lowered 25 degree Celsius by adding certain amount of ice to it find the mass of ice added.Given, specific heat capacity of water is equal to 4200 joule per gram specific latent heat of ice is equal to 336000 joule per gram.

68.The half life of a radioactive isotope x is 20 years.It decays to another element y which is stable.X and Y were found to be in the ratio 1:7 in a given sample of rock.The estimated age of the rock a)60 b)80 c)100 d)40

Name two conditions which are essential for rusting. Write the chemical equation for rusting of Iron. [2 MARKS]

10. Why the H^+concentration of water is added to acid when it's concentration is less than 10^{-6}.?

Fit the given words correctly in the given blanks. state, shape, and composition.1) Moulding of clay involves change in___.2) Burning of wood involves change in_.3) Melting of ice involves change in______.

Name the operation (shown in the figure) involved during the purification of water to obtain an adequate quantity of potable water.