15280 + Interview Questions in Chemistry Page 149 InterviewSolution

7401.	'Stability of a crystal is reflected in the magnitude of its melting point'. Comment. Collect melting points of solid water, ethyl alcohol, diethyl ether and methane from a data book. What can you say about the intermolecular forces between these molecules?
Answer» 'Stability of a crystal is reflected in the magnitude of its melting point'. Comment. Collect melting points of solid water, ethyl alcohol, diethyl ether and methane from a data book. What can you say about the intermolecular forces between these molecules?

Discussion

7402.	You are provided with PbCO3, ZnCO3 and CaCO3. How will you identify these cations?
Answer» You are provided with PbCO₃, ZnCO₃ and CaCO₃. How will you identify these cations?

Discussion

7403.	In the reaction given below, identify X and Y.CH3OH+Na→X+Y
Answer» In the reaction given below, identify X and Y. $C H_{3} O H + N a \to X + Y$

Discussion

7404.	Paragraph for below questionनीचे दिए गए प्रश्न के लिए अनुच्छेदA dilute solution contains ‘Y’ moles of solute A with 1000 gm of a solvent, the molal elevation constant of solvent is Kb. The solute is tetramerise in the solution according to the following equation and its degree of association is β.एक तनु विलयन में 1000 gm विलायक के साथ ‘Y’ मोल विलेय A है, विलायक का मोलल उन्नयन स्थिरांक Kb है। निम्नलिखित समीकरण के अनुसार विलयन में विलेय चतुष्टयीकृत हो जाता है तथा इसके संगुणन की मात्रा β है।Q. The degree of association (β) is equal to, if ΔTb is the elevation in boiling point.प्रश्न - यदि ΔTb क्वथनांक उन्नयन है, तो संगुणन की मात्रा (β) होगी
Answer» Paragraph for below question नीचे दिए गए प्रश्न के लिए अनुच्छेद A dilute solution contains ‘Y’ moles of solute A with 1000 gm of a solvent, the molal elevation constant of solvent is K_b. The solute is tetramerise in the solution according to the following equation and its degree of association is β. एक तनु विलयन में 1000 gm विलायक के साथ ‘Y’ मोल विलेय A है, विलायक का मोलल उन्नयन स्थिरांक K_b है। निम्नलिखित समीकरण के अनुसार विलयन में विलेय चतुष्टयीकृत हो जाता है तथा इसके संगुणन की मात्रा β है। Q. The degree of association (β) is equal to, if ΔT_b is the elevation in boiling point. प्रश्न - यदि ΔT_b क्वथनांक उन्नयन है, तो संगुणन की मात्रा (β) होगी

Discussion

7405.	What is an electron? What is its relative mass and charge?
Answer» What is an electron? What is its relative mass and charge?

Discussion

7406.	In a chemical reaction, 300 g baking soda mixture containing sodium bicarbonate and vinegar on heating gives 174 g carbon dioxide gas. How much solid residue would be left over?
Answer» In a chemical reaction, $300 g$ baking soda mixture containing sodium bicarbonate and vinegar on heating gives $174 g$ carbon dioxide gas. How much solid residue would be left over?

Discussion

7407.	Concept of location of Voids in hcp
Answer» Concept of location of Voids in hcp

Discussion

7408.	A sample of ammonium phosphate contain 3.18 miles of hydrogen atoms.thr number of moles of oxygen atoms in the sample is
Answer» A sample of ammonium phosphate contain 3.18 miles of hydrogen atoms.thr number of moles of oxygen atoms in the sample is

Discussion

7409.	The process of storing tissues, organs, embryos and seeds at ______ is known as cryopreservation.
Answer» The process of storing tissues, organs, embryos and seeds at ______ is known as cryopreservation.

Discussion

7410.	what do we mean by polar and non polar ?
Answer» what do we mean by polar and non polar ?

Discussion

7411.	Equal weights of methane and oxygen are mixed in an empty container at 25oC. The fraction of the total pressure exerted by oxygen is (IIT-JEE, 1981)
Answer» Equal weights of methane and oxygen are mixed in an empty container at $25^{o} C .$ The fraction of the total pressure exerted by oxygen is (IIT-JEE, 1981)

Discussion

7412.	16. How to detect alfa C in Alkane,Alkene and Alkyne??
Answer» 16. How to detect alfa C in Alkane,Alkene and Alkyne??

Discussion

7413.	Vinegar is greyish in colour with a particular taste. Explain.
Answer» Vinegar is greyish in colour with a particular taste. Explain.

Discussion

7414.	How to easily find the no of molecules and moles and electron
Answer» How to easily find the no of molecules and moles and electron

Discussion

7415.	Consider the given reaction:2SO2(g)+O2(g)⇋2SO3(g)+heatWhat will happen if the pressure of the reacting system is decreased?
Answer» Consider the given reaction: $2 S O_{2} (g) + O_{2} (g) ⇋ 2 S O_{3} (g) + h e a t$ What will happen if the pressure of the reacting system is decreased?

7415.

Consider the given reaction:2SO2(g)+O2(g)⇋2SO3(g)+heatWhat will happen if the pressure of the reacting system is decreased?

Answer»

Consider the given reaction:

$2 S O_{2} (g) + O_{2} (g) ⇋ 2 S O_{3} (g) + h e a t$

What will happen if the pressure of the reacting system is decreased?

Discussion

7416.	3. Benzyl radical is aromatic because it has 6p–orbitals and 7 unpaired electrons B6p–orbitals and 6 unpaired electrons C7p–orbitals and 6 unpaired electrons D7p–orbitals and 7 unpaired electrons
Answer» 3. Benzyl radical is aromatic because it has 6p–orbitals and 7 unpaired electrons B6p–orbitals and 6 unpaired electrons C7p–orbitals and 6 unpaired electrons D7p–orbitals and 7 unpaired electrons

Discussion

7417.	A reaction in which a single product is formed from two or more reactants is known as __.
Answer» A reaction in which a single product is formed from two or more reactants is known as __.

Discussion

7418.	Explain corrosion of iron.
Answer» Explain corrosion of iron.

Discussion

7419.	A compound ' on heating with excess conc. sulphuric acid at 443 K gives arnunsaturated compound Y X also reacts with sodium metal to evolve a colourlessgas Z. Identify X', 'Y' and Z'. Write the equation of the chemical reaction offormation of Y' and also write the role of sulphuric acid in the reaction.
Answer» A compound ' on heating with excess conc. sulphuric acid at 443 K gives arnunsaturated compound Y X also reacts with sodium metal to evolve a colourlessgas Z. Identify X', 'Y' and Z'. Write the equation of the chemical reaction offormation of Y' and also write the role of sulphuric acid in the reaction.

Discussion

7420.	Molecule in which the distance between two adjacent carbon atom is largest, is:
Answer» Molecule in which the distance between two adjacent carbon atom is largest, is:

Discussion

7421.	Classify each of the following on the basis of their atomicity(a) F2 (b) O3 (c) S8 (d) He (e) P4 (f) Mg (g) N2
Answer» Classify each of the following on the basis of their atomicity (a) F2 (b) O3 (c) S8 (d) He (e) P4 (f) Mg (g) N2

Discussion

7422.	41 What are the reactions between NaOH and Zn and between NaOH and Zn?
Answer» 41 What are the reactions between NaOH and Zn and between NaOH and Zn?

Discussion

7423.	What is the nature of metalic oxide?
Answer» What is the nature of metalic oxide?

Discussion

7424.	The number of ions formed on dissolving one molecule of K[Co(NH3)5Cl]in water is :
Answer» The number of ions formed on dissolving one molecule of $K [C o (N H_{3})_{5} C l]$ in water is :

Discussion

7425.	Explain why, food products containing fats and oils (like potato chips) are packaged in nitrogen.
Answer» Explain why, food products containing fats and oils (like potato chips) are packaged in nitrogen.

Discussion

7426.	Four test tubes named as (i)-(iv) are half-filled with colourless aqueous solution of Al2(SO4)3.A piece of metal zinc was placed in test tube (i), iron in test tube (ii), copper in test tube (iii) and aluminium in test tube (iv). The final colour in the four test tubes are:
Answer» Four test tubes named as (i)-(iv) are half-filled with colourless aqueous solution of $A l_{2} (S O_{4})_{3}$ . A piece of metal zinc was placed in test tube (i), iron in test tube (ii), copper in test tube (iii) and aluminium in test tube (iv). The final colour in the four test tubes are:

Discussion

7427.	Write the equation for following reaction:(i) Bromoethane and an aqueous solution of hydroxide.(ii) Calcium carbide and water.(iii) Ethene and water (steam).
Answer» Write the equation for following reaction: (i) Bromoethane and an aqueous solution of hydroxide. (ii) Calcium carbide and water. (iii) Ethene and water (steam).

Discussion

7428.	Arrange the following metals in the decreasing order of chemical reactivity, Cu, Mg, Fe, Na, Ca, Zn.
Answer» Arrange the following metals in the decreasing order of chemical reactivity, Cu, Mg, Fe, Na, Ca, Zn.

Discussion

7429.	Find the missing number in the box .
Answer» Find the missing number in the box .

Discussion

7430.	Benzene is -M or +M group
Answer» Benzene is -M or +M group

Discussion

7431.	Drying agents like calcium oxide and phosphorus pentoxide are not used for drying hydrogen chloride gas. Give reasons for each.
Answer» Drying agents like calcium oxide and phosphorus pentoxide are not used for drying hydrogen chloride gas. Give reasons for each.

Discussion

7432.	Question 6What is a homologous series? Explain with an example.
Answer» Question 6 What is a homologous series? Explain with an example.

Discussion

7433.	25 ml of 0.1 M acetic acid is titrated with 0.1NaoH solution. The pH of the solution atequivalence point will be (log 5 0.7CH3COOH = 4.76)
Answer» 25 ml of 0.1 M acetic acid is titrated with 0.1NaoH solution. The pH of the solution atequivalence point will be (log 5 0.7CH3COOH = 4.76)

Discussion

7434.	When ammonium dichromate is heated a green colour substance is obtain. Name the substance .Also give chemical equation of this reaction
Answer» When ammonium dichromate is heated a green colour substance is obtain. Name the substance .Also give chemical equation of this reaction

Discussion

7435.	13. In an FCC lattice atom a occupies corner positions and atom b occupies face centre positions.if one of atom b is missing from one of the face centred points the formula of compound is 1.a2v3 2.a2b5 3.a2b 4.ab2
Answer» 13. In an FCC lattice atom a occupies corner positions and atom b occupies face centre positions.if one of atom b is missing from one of the face centred points the formula of compound is 1.a2v3 2.a2b5 3.a2b 4.ab2

Discussion

7436.	carbon has 4 valence electrons so it has a property of self-combination but silicon also hs 4 valence electrons then why does not it have the property of self combination
Answer» carbon has 4 valence electrons so it has a property of self-combination but silicon also hs 4 valence electrons then why does not it have the property of self combination

Discussion

7437.	Give the importance of the following in living beings: (a) Nitrogen, (b) Hydrogen, (c) Carbon.
Answer» Give the importance of the following in living beings: (a) Nitrogen, (b) Hydrogen, (c) Carbon.

7437.

Give the importance of the following in living beings: (a) Nitrogen, (b) Hydrogen, (c) Carbon.

Answer»

Give the importance of the following in living beings:

(a) Nitrogen, (b) Hydrogen,

(c) Carbon.

Discussion

7438.	What will be the consequence of the absence of decomposers in the ecosystem?
Answer» What will be the consequence of the absence of decomposers in the ecosystem?

Discussion

7439.	You are given the following molecular formulae of some hydrocarbons : C5H8 , C7H14 , C6H6 , C5H10 , C7H12 , C6H12 (a) Which formula represents cyclohexane as well as hexene? (b) Which formula represents benzene? (c) Which three formulae represent open-chain unsaturated hydrocarbons having double bonds? (d) Which two formulae represent unsaturated hydrocarbons having triple bonds? (e) Which three formulae can represent cyclic hydrocarbons?
Answer» You are given the following molecular formulae of some hydrocarbons : $C_{5} H_{8}$ , $C_{7} H_{14}$ , $C_{6} H_{6}$ , $C_{5} H_{10}$ , $C_{7} H_{12}$ , $C_{6} H_{12}$ (a) Which formula represents cyclohexane as well as hexene? (b) Which formula represents benzene? (c) Which three formulae represent open-chain unsaturated hydrocarbons having double bonds? (d) Which two formulae represent unsaturated hydrocarbons having triple bonds? (e) Which three formulae can represent cyclic hydrocarbons?

Discussion

7440.	(a) The observation seen when fused lead bromide is electrolysed is : (i) A silver grey deposit at an anode and a reddish brown deposit at the cathode. (ii) A silver grey deposit at the cathode and a reddish brown deposit at the anode. (iii) A silver grey deposit at the cathode and reddish brown fumes at the anode. (iv) Silver grey fumes at anode reddish brown fumes at the cathode. (b) During electroplating an article with silver, the electrolyte used is : (i) Silver nitrate solution (ii) Silver cyanide solution (iii) Sodium argentocyanide solution (iv) Nickel sulphate solution. (c) Give one word or phrase for electrolytic deposition of a superior metal on a baser metal. (d) State your observation: At the cathode when acidified aqueous copper sulphate solution is electrolysed with copper electrodes. (e) State which electrode: anode or cathode is the oxidising electrode. Give a reason for the same. (f) Name the king of particle present in : (i) Sodium hydroxide soln. (ii) Carbonic acid (iii) Sugar soln. (g) M2O is the oxide of a metal 'M' which is above hydrogen in the activity series. M2O when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. (i) State the reaction taking place at the cathode (ii) Name the product at the anode.
Answer» (a) The observation seen when fused lead bromide is electrolysed is : (i) A silver grey deposit at an anode and a reddish brown deposit at the cathode. (ii) A silver grey deposit at the cathode and a reddish brown deposit at the anode. (iii) A silver grey deposit at the cathode and reddish brown fumes at the anode. (iv) Silver grey fumes at anode reddish brown fumes at the cathode. (b) During electroplating an article with silver, the electrolyte used is : (i) Silver nitrate solution (ii) Silver cyanide solution (iii) Sodium argentocyanide solution (iv) Nickel sulphate solution. (c) Give one word or phrase for electrolytic deposition of a superior metal on a baser metal. (d) State your observation: At the cathode when acidified aqueous copper sulphate solution is electrolysed with copper electrodes. (e) State which electrode: anode or cathode is the oxidising electrode. Give a reason for the same. (f) Name the king of particle present in : (i) Sodium hydroxide soln. (ii) Carbonic acid (iii) Sugar soln. (g) $M_{2} O$ is the oxide of a metal 'M' which is above hydrogen in the activity series. $M_{2} O$ when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. (i) State the reaction taking place at the cathode (ii) Name the product at the anode.

7440.

(a) The observation seen when fused lead bromide is electrolysed is : (i) A silver grey deposit at an anode and a reddish brown deposit at the cathode. (ii) A silver grey deposit at the cathode and a reddish brown deposit at the anode. (iii) A silver grey deposit at the cathode and reddish brown fumes at the anode. (iv) Silver grey fumes at anode reddish brown fumes at the cathode. (b) During electroplating an article with silver, the electrolyte used is : (i) Silver nitrate solution (ii) Silver cyanide solution (iii) Sodium argentocyanide solution (iv) Nickel sulphate solution. (c) Give one word or phrase for electrolytic deposition of a superior metal on a baser metal. (d) State your observation: At the cathode when acidified aqueous copper sulphate solution is electrolysed with copper electrodes. (e) State which electrode: anode or cathode is the oxidising electrode. Give a reason for the same. (f) Name the king of particle present in : (i) Sodium hydroxide soln. (ii) Carbonic acid (iii) Sugar soln. (g) M2O is the oxide of a metal 'M' which is above hydrogen in the activity series. M2O when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. (i) State the reaction taking place at the cathode (ii) Name the product at the anode.

Answer»

(a) The observation seen when fused lead bromide is electrolysed is :

(i) A silver grey deposit at an anode and a reddish brown deposit at the cathode.

(ii) A silver grey deposit at the cathode and a reddish brown deposit at the anode.

(iii) A silver grey deposit at the cathode and reddish brown fumes at the anode.

(iv) Silver grey fumes at anode reddish brown fumes at the cathode.

(b) During electroplating an article with silver, the electrolyte used is :

(i) Silver nitrate solution

(ii) Silver cyanide solution

(iii) Sodium argentocyanide solution

(iv) Nickel sulphate solution.

(c) Give one word or phrase for electrolytic deposition of a superior metal on a baser metal.

(d) State your observation: At the cathode when acidified aqueous copper sulphate solution is electrolysed with copper electrodes.

(e) State which electrode: anode or cathode is the oxidising electrode. Give a reason for the same.

(f) Name the king of particle present in :

(i) Sodium hydroxide soln.

(ii) Carbonic acid

(iii) Sugar soln.

(g) $M_{2} O$ is the oxide of a metal 'M' which is above hydrogen in the activity series. $M_{2} O$ when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity.

(i) State the reaction taking place at the cathode

(ii) Name the product at the anode.

Discussion

7441.

Consider the section of the periodic table given below: Group number IA IIA IIIA IVA VA VIA VIIA 0 1 2 13 14 15 16 17 18 Li D O J Ne A Mg E Si H K B C F G L Note: In this table B does not represent boronC does not represent carbonF does not represent fluorineH does not represent hydrogenK does not represent potassiumYou must see the position of the element in the periodic table.Some elements are given in their own symbol and position in the periodic table, while others are shown with a letter. With reference to the table answer the following:(i) Which is the most electronegative?(ii) How many valence electrons are present in G?(iii) Write the formula of the compound between B and H.(iv) In the compound between F and J, what type of bond will be formed?(v) Draw the electron dot structure for the compound formed between C and K.

Answer» Consider the section of the periodic table given below:

Group number	IA	IIA	IIIA	IVA	VA	VIA	VIIA	0
	1	2	13	14	15	16	17	18
	Li		D			O	J	Ne
	A	Mg	E	Si		H	K
	B	C		F	G			L

Note: In this table B does not represent boron

C does not represent carbon

F does not represent fluorine

H does not represent hydrogen

K does not represent potassium

You must see the position of the element in the periodic table.

Some elements are given in their own symbol and position in the periodic table, while others are shown with a letter. With reference to the table answer the following:

(i) Which is the most electronegative?

(ii) How many valence electrons are present in G?

(iii) Write the formula of the compound between B and H.

(iv) In the compound between F and J, what type of bond will be formed?

(v) Draw the electron dot structure for the compound formed between C and K.

Discussion

7442.	Which of the mentioned metals is found only in the form of minerals?
Answer» Which of the mentioned metals is found only in the form of minerals?

Discussion

7443.	Identify the oxidised and reduced substances in the following reaction: 4Na(s)+O2(g)→2Na2O(s)
Answer» Identify the oxidised and reduced substances in the following reaction: $4 N a (s) + O_{2} (g) \to 2 N a_{2} O (s)$

7443.

Identify the oxidised and reduced substances in the following reaction: 4Na(s)+O2(g)→2Na2O(s)

Answer»

Identify the oxidised and reduced substances in the following reaction:

$4 N a (s) + O_{2} (g) \to 2 N a_{2} O (s)$

Discussion

7444.	The molecules of alkene family are represented by a general formula CnH2n. Answer the following: (a) What do n and 2n signify? (b) What is the name of alkene when n = 4? (c) What is the molecular formula of alkene when n = 4? (d) What is the molecular formula of the alkene if there are ten H atoms in it? (e) What is the structural formula of the third member of the alkene family? (f) Write the molecular formula of lower and higher homologous of an alkene which contains four carbon atoms.
Answer» The molecules of alkene family are represented by a general formula $C_{n} H_{2 n}$ . Answer the following: (a) What do n and 2n signify? (b) What is the name of alkene when n = 4? (c) What is the molecular formula of alkene when n = 4? (d) What is the molecular formula of the alkene if there are ten H atoms in it? (e) What is the structural formula of the third member of the alkene family? (f) Write the molecular formula of lower and higher homologous of an alkene which contains four carbon atoms.

Discussion

7445.	6 g of non volatile, non-electrolytic solute X is present in 1 litre and this solution is isotonic with 0.2925 (w/v)% NaCl solution. (Assume NaCl completely dissociates and temperature of both solution is 27 °C). Molar mass of X (in g/mol) is
Answer» 6 g of non volatile, non-electrolytic solute X is present in 1 litre and this solution is isotonic with 0.2925 (w/v)% NaCl solution. (Assume NaCl completely dissociates and temperature of both solution is 27 °C). Molar mass of X (in g/mol) is

Discussion

7446.	30. Why xeF4 non polar insread of lone pair
Answer» 30. Why xeF4 non polar insread of lone pair

Discussion

7447.	(skipTOITTwo liquids A and B have vapour pressure in the ratio =1 : 3at a certaintemperature. Assume A and B form an ideal solution and the ratio of mole fraction of Aand B in the vapour phase is 4: 3. Then the mole fraction of B in the solution at the sametemperature isOptions:344
Answer» (skipTOITTwo liquids A and B have vapour pressure in the ratio =1 : 3at a certaintemperature. Assume A and B form an ideal solution and the ratio of mole fraction of Aand B in the vapour phase is 4: 3. Then the mole fraction of B in the solution at the sametemperature isOptions:344

Discussion

7448.	which is the first and second excited state of hydrogen atom
Answer» which is the first and second excited state of hydrogen atom

Discussion

7449.	(a) How does the size of atoms (atomic size) generally vary in going from left to right in a period of the periodic table? Why does it vary this way? (b) What happens to the metallic character of the elements as we move from left to right in a period of the periodic table?
Answer» (a) How does the size of atoms (atomic size) generally vary in going from left to right in a period of the periodic table? Why does it vary this way? (b) What happens to the metallic character of the elements as we move from left to right in a period of the periodic table?

7449.

(a) How does the size of atoms (atomic size) generally vary in going from left to right in a period of the periodic table? Why does it vary this way? (b) What happens to the metallic character of the elements as we move from left to right in a period of the periodic table?

Answer»

(a) How does the size of atoms (atomic size) generally vary in going from left to right in a period of the periodic table? Why does it vary this way?

(b) What happens to the metallic character of the elements as we move from left to right in a period of the periodic table?

Discussion

7450.	A metal M forms a compound M2HPO4.Molecular mass of metal nitride will be if equivalent mass of metal is 30g
Answer» A metal M forms a compound M2HPO4.Molecular mass of metal nitride will be if equivalent mass of metal is 30g

Discussion

Explore topic-wise InterviewSolutions in .

'Stability of a crystal is reflected in the magnitude of its melting point'. Comment. Collect melting points of solid water, ethyl alcohol, diethyl ether and methane from a data book. What can you say about the intermolecular forces between these molecules?

You are provided with PbCO3, ZnCO3 and CaCO3. How will you identify these cations?

In the reaction given below, identify X and Y.CH3OH+Na→X+Y

What is an electron? What is its relative mass and charge?

In a chemical reaction, 300 g baking soda mixture containing sodium bicarbonate and vinegar on heating gives 174 g carbon dioxide gas. How much solid residue would be left over?

Concept of location of Voids in hcp

A sample of ammonium phosphate contain 3.18 miles of hydrogen atoms.thr number of moles of oxygen atoms in the sample is

The process of storing tissues, organs, embryos and seeds at ______ is known as cryopreservation.

what do we mean by polar and non polar ?

Equal weights of methane and oxygen are mixed in an empty container at 25oC. The fraction of the total pressure exerted by oxygen is (IIT-JEE, 1981)

16. How to detect alfa C in Alkane,Alkene and Alkyne??

Vinegar is greyish in colour with a particular taste. Explain.

How to easily find the no of molecules and moles and electron

Consider the given reaction:2SO2(g)+O2(g)⇋2SO3(g)+heatWhat will happen if the pressure of the reacting system is decreased?

3. Benzyl radical is aromatic because it has 6p–orbitals and 7 unpaired electrons B6p–orbitals and 6 unpaired electrons C7p–orbitals and 6 unpaired electrons D7p–orbitals and 7 unpaired electrons

A reaction in which a single product is formed from two or more reactants is known as __.

Explain corrosion of iron.

Molecule in which the distance between two adjacent carbon atom is largest, is:

Classify each of the following on the basis of their atomicity(a) F2 (b) O3 (c) S8 (d) He (e) P4 (f) Mg (g) N2

41 What are the reactions between NaOH and Zn and between NaOH and Zn?

What is the nature of metalic oxide?

The number of ions formed on dissolving one molecule of K[Co(NH3)5Cl]in water is :

Explain why, food products containing fats and oils (like potato chips) are packaged in nitrogen.

Four test tubes named as (i)-(iv) are half-filled with colourless aqueous solution of Al2(SO4)3.A piece of metal zinc was placed in test tube (i), iron in test tube (ii), copper in test tube (iii) and aluminium in test tube (iv). The final colour in the four test tubes are:

Write the equation for following reaction:(i) Bromoethane and an aqueous solution of hydroxide.(ii) Calcium carbide and water.(iii) Ethene and water (steam).

Arrange the following metals in the decreasing order of chemical reactivity, Cu, Mg, Fe, Na, Ca, Zn.

Find the missing number in the box .

Benzene is -M or +M group

Drying agents like calcium oxide and phosphorus pentoxide are not used for drying hydrogen chloride gas. Give reasons for each.

Question 6What is a homologous series? Explain with an example.

25 ml of 0.1 M acetic acid is titrated with 0.1NaoH solution. The pH of the solution atequivalence point will be (log 5 0.7CH3COOH = 4.76)

When ammonium dichromate is heated a green colour substance is obtain. Name the substance .Also give chemical equation of this reaction

13. In an FCC lattice atom a occupies corner positions and atom b occupies face centre positions.if one of atom b is missing from one of the face centred points the formula of compound is 1.a2v3 2.a2b5 3.a2b 4.ab2

carbon has 4 valence electrons so it has a property of self-combination but silicon also hs 4 valence electrons then why does not it have the property of self combination

Give the importance of the following in living beings: (a) Nitrogen, (b) Hydrogen, (c) Carbon.

What will be the consequence of the absence of decomposers in the ecosystem?

Which of the mentioned metals is found only in the form of minerals?

Identify the oxidised and reduced substances in the following reaction: 4Na(s)+O2(g)→2Na2O(s)

6 g of non volatile, non-electrolytic solute X is present in 1 litre and this solution is isotonic with 0.2925 (w/v)% NaCl solution. (Assume NaCl completely dissociates and temperature of both solution is 27 °C). Molar mass of X (in g/mol) is

30. Why xeF4 non polar insread of lone pair

(skipTOITTwo liquids A and B have vapour pressure in the ratio =1 : 3at a certaintemperature. Assume A and B form an ideal solution and the ratio of mole fraction of Aand B in the vapour phase is 4: 3. Then the mole fraction of B in the solution at the sametemperature isOptions:344

which is the first and second excited state of hydrogen atom

(a) How does the size of atoms (atomic size) generally vary in going from left to right in a period of the periodic table? Why does it vary this way? (b) What happens to the metallic character of the elements as we move from left to right in a period of the periodic table?

A metal M forms a compound M2HPO4.Molecular mass of metal nitride will be if equivalent mass of metal is 30g