10223 + Interview Questions in Chemistry Page 15 InterviewSolution

701.	When 0.15 kg of ice at 0∘C is mixed with 0.30 kg of water at 50∘C in a container, the resulting temperature of the mixture is 6.7∘C. Calculate the latent heat of fusion of ice. (Swater=4186 J kg–1K−1)
Answer» When $0.15 kg$ of ice at $0^{\circ} C$ is mixed with $0.30 kg$ of water at $50^{\circ} C$ in a container, the resulting temperature of the mixture is ${6.7}^{\circ} C$ . Calculate the latent heat of fusion of ice. $(S_{w a t e r} = 4186 J {kg}^{- 1} K^{- 1})$

Discussion

702.	33. Oxidation state of each element in sodium thionitroprusside
Answer» 33. Oxidation state of each element in sodium thionitroprusside

Discussion

703.	Classify the following into metals and non-metals:Copper, iron, graphite, sulphur, aluminium, oxygen
Answer» Classify the following into metals and non-metals: Copper, iron, graphite, sulphur, aluminium, oxygen

703.

Classify the following into metals and non-metals:Copper, iron, graphite, sulphur, aluminium, oxygen

Answer»

Classify the following into metals and non-metals:

Copper, iron, graphite, sulphur, aluminium, oxygen

Discussion

704.	Write the balanced reaction between zinc and hydrochloric acid.
Answer» Write the balanced reaction between zinc and hydrochloric acid.

Discussion

705.	Which of the following is true about CO2?
Answer» Which of the following is true about $C O_{2}$ ?

Discussion

706.	Explain principle of calorimetry or the principle of mixtures.
Answer» Explain principle of calorimetry or the principle of mixtures.

Discussion

707.	Let the mass of electron is two times, mass ofproton is 1/4th and mass of neutron is 3/2 oforiginal mass. Then, the atomic weight ofC126atom(1) Increases by 37.5 %(2) Decreases by 87.5 %(3) Decreases by 12.5 %(4) Remains same
Answer» Let the mass of electron is two times, mass ofproton is 1/4th and mass of neutron is 3/2 oforiginal mass. Then, the atomic weight ofC126atom(1) Increases by 37.5 %(2) Decreases by 87.5 %(3) Decreases by 12.5 %(4) Remains same

Discussion

708.	'X' L N2 gas at STP contains 3*1022 molecules. The number of molecules in X L ozone at STP will be:
Answer» 'X' L N₂gas at STP contains 3*10²²molecules. The number of molecules in X L ozone at STP will be:

Discussion

709.	The atoms shown above are
Answer» The atoms shown above are

709.

The atoms shown above are

Answer»

The atoms shown above are

Discussion

710.	(a) When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance(b) A girl is cooking some food in the kitchen. The smell of food being cooked soon reaches her brother's room. Explain how the smell could have reached her brother's room.
Answer» (a) When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance (b) A girl is cooking some food in the kitchen. The smell of food being cooked soon reaches her brother's room. Explain how the smell could have reached her brother's room.

Discussion

711.	If element B has 6 electrons in the outermost orbital then what will be its valency and how?
Answer» If element B has 6 electrons in the outermost orbital then what will be its valency and how?

Discussion

712.	91 when there is sulphonation of phenol then why at low temp major product is ortho sulphonic acid but at high temp major product id para sulphonic acid?
Answer» 91 when there is sulphonation of phenol then why at low temp major product is ortho sulphonic acid but at high temp major product id para sulphonic acid?

Discussion

713.	68. Atomic weight of calcium is 40amu on C-12 scale.If 1/10 of an atom of C-12 is taken as standard then relative atomic weight of calcium will be ?
Answer» 68. Atomic weight of calcium is 40amu on C-12 scale.If 1/10 of an atom of C-12 is taken as standard then relative atomic weight of calcium will be ?

Discussion

714.	What is carbon monoxide?
Answer» What is carbon monoxide?

Discussion

715.	(i) What is the common feature of the electronic configurations of the elements at the end of period 2 and period 3?(ii) If an element is in group 7 (or Group VIIA), is it likely to be metallic or non-metallic in character?(iii) Supply the missing word from the words given in brackets.If an element has one electron in its outermost energy level (shell), then it is likely to be ______ (metallic/non-metallic).
Answer» (i) What is the common feature of the electronic configurations of the elements at the end of period 2 and period 3? (ii) If an element is in group 7 (or Group VIIA), is it likely to be metallic or non-metallic in character? (iii) Supply the missing word from the words given in brackets. If an element has one electron in its outermost energy level (shell), then it is likely to be ______ (metallic/non-metallic).

Discussion

716.	how to calculate the oxide and hydride formula for elements in group 8 in mendeleevs periodic table
Answer» how to calculate the oxide and hydride formula for elements in group 8 in mendeleevs periodic table

Discussion

717.	28. Difference between atomic mass, atomic mass unit, and mole .
Answer» 28. Difference between atomic mass, atomic mass unit, and mole .

Discussion

718.	The atomic mass of Oxygen is 16u. Considering the above statement, which among the following options can be inferred?
Answer» The atomic mass of Oxygen is 16u. Considering the above statement, which among the following options can be inferred?

718.

The atomic mass of Oxygen is 16u. Considering the above statement, which among the following options can be inferred?

Answer»

The atomic mass of Oxygen is 16u.

Considering the above statement, which among the following options can be inferred?

Discussion

719.	Explain about HCP it's CN packing efficency
Answer» Explain about HCP it's CN packing efficency

Discussion

720.	Define: (a) Photochemical reaction (b) Electrochemical reaction. Give one example in each case.
Answer» Define: (a) Photochemical reaction (b) Electrochemical reaction. Give one example in each case.

720.

Define: (a) Photochemical reaction (b) Electrochemical reaction. Give one example in each case.

Answer»

Define:

(a) Photochemical reaction

(b) Electrochemical reaction.

Give one example in each case.

Discussion

721.	How many elements from the following can react with hydrochloric acid? Na, Mg, K, Al, Zn, Ca, Ag, Pt, Cu.6
Answer» How many elements from the following can react with hydrochloric acid? Na, Mg, K, Al, Zn, Ca, Ag, Pt, Cu. 6

Discussion

722.	The homogenous mixture of solute and solvent is called __________.
Answer» The homogenous mixture of solute and solvent is called __________.

Discussion

723.	Calculate the mass of 0.72 grams molecule of carbon dioxide
Answer» Calculate the mass of 0.72 grams molecule of carbon dioxide

Discussion

724.	Identify the following reactions as oxidation or reduction reaction: i) K−e−→K+ ii) Fe3++e−→Fe2+
Answer» Identify the following reactions as oxidation or reduction reaction: i) $K - e^{-} \to K^{+}$ ii) $F e^{3 +} + e^{-} \to F e^{2 +}$

Discussion

725.	Question 50 (c) An element X of group 15 exists as diatomic molecule and combines with hydrogen at 773 K in presence of the catalyst to form a compound, ammonia which has a characteristic pungent smell. Draw the electron dot structure for ammonia and what type of bond is formed in it?
Answer» Question 50 (c) An element X of group 15 exists as diatomic molecule and combines with hydrogen at 773 K in presence of the catalyst to form a compound, ammonia which has a characteristic pungent smell. Draw the electron dot structure for ammonia and what type of bond is formed in it?

Discussion

726.	Consider the following reactions.Reaction 1 : A → B ; Ea = 28.31 kJReaction 2 : C → D ; Ea = 20 kJIf the initial temperature is 400 K for both reaction and the rate constants are equal then find the ratio of Arrhenius factor A1 : A2 for reaction 1 and 2.
Answer» Consider the following reactions. Reaction 1 : A → B ; Ea = 28.31 kJ Reaction 2 : C → D ; Ea = 20 kJ If the initial temperature is 400 K for both reaction and the rate constants are equal then find the ratio of Arrhenius factor A1 : A2 for reaction 1 and 2.

Discussion

727.	(a) Define atomic mass unit. (b) Calculate the molecular mass of the following : (i) CuSO4.5H2O (ii) (NH4)2CO3 (iii) (NH2)2CO (iv) Mg3N2 Given atomic mass of Cu = 63.5, H = 1, O = 16, C = 12, N = 14, Mg = 24, S = 32
Answer» (a) Define atomic mass unit. (b) Calculate the molecular mass of the following : (i) $C u S O_{4} .5 H_{2} O$ (ii) $(N H_{4})_{2} C O_{3}$ (iii) $(N H_{2})_{2} C O$ (iv) $M g_{3} N_{2}$ Given atomic mass of Cu = 63.5, H = 1, O = 16, C = 12, N = 14, Mg = 24, S = 32

727.

(a) Define atomic mass unit. (b) Calculate the molecular mass of the following : (i) CuSO4.5H2O (ii) (NH4)2CO3 (iii) (NH2)2CO (iv) Mg3N2 Given atomic mass of Cu = 63.5, H = 1, O = 16, C = 12, N = 14, Mg = 24, S = 32

Answer»

(a) Define atomic mass unit.

(b) Calculate the molecular mass of the following :

(i) $C u S O_{4} .5 H_{2} O$ (ii) $(N H_{4})_{2} C O_{3}$

(iii) $(N H_{2})_{2} C O$ (iv) $M g_{3} N_{2}$

Given atomic mass of Cu = 63.5, H = 1, O = 16, C = 12, N = 14, Mg = 24, S = 32

Discussion

728.	While designing for a steel column of Fe250 grade, the base plate resting on a concrete pedestal of M20 grade, the bearing strength of concrete N/mm2 in LSM of design as per IS 456:2000 is _______.9
Answer» While designing for a steel column of Fe250 grade, the base plate resting on a concrete pedestal of M20 grade, the bearing strength of concrete $N / m m^{2}$ in LSM of design as per IS 456:2000 is _______. 9

Discussion

729.	the ksp of AG2CRO4 is 1.1 ×10^{-12 } at 298 k the solublity of AG2CRO4 IN a0.1M AgNO3 solution
Answer» the ksp of AG2CRO4 is 1.1 ×10^{-12 } at 298 k the solublity of AG2CRO4 IN a0.1M AgNO3 solution

Discussion

730.	Among LiCl, BeCl2, BCl3 and CCl4, the covalent bond character varies as :
Answer» Among $L i C l, B e C l_{2}, B C l_{3} a n d C C l_{4}$ , the covalent bond character varies as :

Discussion

731.	26. The total number of valence electron in 4.2 gram of N3- ion is ?
Answer» 26. The total number of valence electron in 4.2 gram of N3- ion is ?

Discussion

732.	nt2 moles of ammonia is introduced in a evacuated 500 ml vessel at high temperatures the decomposition rxn. is 2NH3-N2+3H2at the equilibrium Nh3 becomes 1 mole then the k would be.n
Answer» nt2 moles of ammonia is introduced in a evacuated 500 ml vessel at high temperatures the decomposition rxn. is 2NH3-N2+3H2at the equilibrium Nh3 becomes 1 mole then the k would be.n

Discussion

733.	What is meant by -A. MicrometreB. Hydrophobic
Answer» What is meant by - A. Micrometre B. Hydrophobic

Discussion

734.	relation between molarity,molality,and density of solution
Answer» relation between molarity,molality,and density of solution

Discussion

735.	Fluorine (F), Chlorine (Cl), Bromine (Br) and other halogens (X) are placed together in the same group because all these elements can form uni-negative ions (F−,Cl−,Br−,X−) called halides. Identify the element that can form such uninegative ion and can be placed in the same group along with halogens.
Answer» Fluorine (F), Chlorine (Cl), Bromine (Br) and other halogens (X) are placed together in the same group because all these elements can form uni-negative ions $(F^{-}, C l^{-}, B r^{-}, X^{-})$ called halides. Identify the element that can form such uninegative ion and can be placed in the same group along with halogens.

Discussion

736.	What happens when crystals of washing soda are left open in dry air?what is this change named as?
Answer» What happens when crystals of washing soda are left open in dry air?what is this change named as?

Discussion

737.	What name is given to those atoms which contain the same number of protons and electrons but different number of neutrons ?
Answer» What name is given to those atoms which contain the same number of protons and electrons but different number of neutrons ?

Discussion

738.	Compressibility factor.Explain in detail
Answer» Compressibility factor.Explain in detail

Discussion

739.	Latest discovery of study of atoms
Answer» Latest discovery of study of atoms

Discussion

740.	Which of the following is/are made up of non-metals?
Answer» Which of the following is/are made up of non-metals?

Discussion

741.	Both rate of diffusion and effusion is inversely proportional to root M because of the common fact that (1) Diffusion and effusion are same (2)Molecular speed directly proportional to 1/root M (3)Both take place due to pressure difference (4)both take place due to concentration difference
Answer» Both rate of diffusion and effusion is inversely proportional to root M because of the common fact that (1) Diffusion and effusion are same (2)Molecular speed directly proportional to 1/root M (3)Both take place due to pressure difference (4)both take place due to concentration difference

Discussion

742.	A chemical reaction involves the breaking up of chemical bonds between atoms resulting in the _______ and simultaneously the formation of bonds with the _______ .
Answer» A chemical reaction involves the breaking up of chemical bonds between atoms resulting in the _______ and simultaneously the formation of bonds with the _______ .

Discussion

743.	Write some physical properties of chlorine gas.
Answer» Write some physical properties of chlorine gas.

Discussion

744.	Why iron sometimes has 2 as valency and sometimes three as valency?
Answer» Why iron sometimes has 2 as valency and sometimes three as valency?

Discussion

745.	What is an atom, atomic mass and atomic number? [3 MARKS]
Answer» What is an atom, atomic mass and atomic number? [3 MARKS]

Discussion

746.	Which of the following are examples of Radio-isotopes?
Answer» Which of the following are examples of Radio-isotopes?

Discussion

747.	What are the uses of thermal decomposition reactions?
Answer» What are the uses of thermal decomposition reactions?

Discussion

748.	The mass of an electron is 9.1110 to the -28 g. How many electron would be required to make 1 g?
Answer» The mass of an electron is 9.1110 to the -28 g. How many electron would be required to make 1 g?

Discussion

749.	34. Are the oxidation state and covalency of Al in [AlCl(H2O)5]2+same?What will be the oxidation state and covalency?How?
Answer» 34. Are the oxidation state and covalency of Al in [AlCl(H2O)5]2+same?What will be the oxidation state and covalency?How?

Discussion

750.	What is the molecular mass of CCl4?Given the atomic mass of C=12 u and Cl=35.5 u
Answer» What is the molecular mass of $C C l_{4}$ ? Given the atomic mass of $C = 12 u$ and $C l = 35.5 u$

Discussion

Explore topic-wise InterviewSolutions in .

When 0.15 kg of ice at 0∘C is mixed with 0.30 kg of water at 50∘C in a container, the resulting temperature of the mixture is 6.7∘C. Calculate the latent heat of fusion of ice. (Swater=4186 J kg–1K−1)

33. Oxidation state of each element in sodium thionitroprusside

Classify the following into metals and non-metals:Copper, iron, graphite, sulphur, aluminium, oxygen

Write the balanced reaction between zinc and hydrochloric acid.

Which of the following is true about CO2?

Explain principle of calorimetry or the principle of mixtures.

Let the mass of electron is two times, mass ofproton is 1/4th and mass of neutron is 3/2 oforiginal mass. Then, the atomic weight ofC126atom(1) Increases by 37.5 %(2) Decreases by 87.5 %(3) Decreases by 12.5 %(4) Remains same

'X' L N2 gas at STP contains 3*1022 molecules. The number of molecules in X L ozone at STP will be:

The atoms shown above are

(a) When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance(b) A girl is cooking some food in the kitchen. The smell of food being cooked soon reaches her brother's room. Explain how the smell could have reached her brother's room.

If element B has 6 electrons in the outermost orbital then what will be its valency and how?

91 when there is sulphonation of phenol then why at low temp major product is ortho sulphonic acid but at high temp major product id para sulphonic acid?

68. Atomic weight of calcium is 40amu on C-12 scale.If 1/10 of an atom of C-12 is taken as standard then relative atomic weight of calcium will be ?

What is carbon monoxide?

how to calculate the oxide and hydride formula for elements in group 8 in mendeleevs periodic table

28. Difference between atomic mass, atomic mass unit, and mole .

The atomic mass of Oxygen is 16u. Considering the above statement, which among the following options can be inferred?

Explain about HCP it's CN packing efficency

Define: (a) Photochemical reaction (b) Electrochemical reaction. Give one example in each case.

How many elements from the following can react with hydrochloric acid? Na, Mg, K, Al, Zn, Ca, Ag, Pt, Cu.6

The homogenous mixture of solute and solvent is called __________.

Calculate the mass of 0.72 grams molecule of carbon dioxide

Identify the following reactions as oxidation or reduction reaction: i) K−e−→K+ ii) Fe3++e−→Fe2+

Question 50 (c) An element X of group 15 exists as diatomic molecule and combines with hydrogen at 773 K in presence of the catalyst to form a compound, ammonia which has a characteristic pungent smell. Draw the electron dot structure for ammonia and what type of bond is formed in it?

Consider the following reactions.Reaction 1 : A → B ; Ea = 28.31 kJReaction 2 : C → D ; Ea = 20 kJIf the initial temperature is 400 K for both reaction and the rate constants are equal then find the ratio of Arrhenius factor A1 : A2 for reaction 1 and 2.

(a) Define atomic mass unit. (b) Calculate the molecular mass of the following : (i) CuSO4.5H2O (ii) (NH4)2CO3 (iii) (NH2)2CO (iv) Mg3N2 Given atomic mass of Cu = 63.5, H = 1, O = 16, C = 12, N = 14, Mg = 24, S = 32

While designing for a steel column of Fe250 grade, the base plate resting on a concrete pedestal of M20 grade, the bearing strength of concrete N/mm2 in LSM of design as per IS 456:2000 is _______.9

the ksp of AG2CRO4 is 1.1 ×10^{-12 } at 298 k the solublity of AG2CRO4 IN a0.1M AgNO3 solution

Among LiCl, BeCl2, BCl3 and CCl4, the covalent bond character varies as :

26. The total number of valence electron in 4.2 gram of N3- ion is ?

nt2 moles of ammonia is introduced in a evacuated 500 ml vessel at high temperatures the decomposition rxn. is 2NH3-N2+3H2at the equilibrium Nh3 becomes 1 mole then the k would be.n

What is meant by -A. MicrometreB. Hydrophobic

relation between molarity,molality,and density of solution

What happens when crystals of washing soda are left open in dry air?what is this change named as?

What name is given to those atoms which contain the same number of protons and electrons but different number of neutrons ?

Compressibility factor.Explain in detail

Latest discovery of study of atoms

Which of the following is/are made up of non-metals?

Both rate of diffusion and effusion is inversely proportional to root M because of the common fact that (1) Diffusion and effusion are same (2)Molecular speed directly proportional to 1/root M (3)Both take place due to pressure difference (4)both take place due to concentration difference

A chemical reaction involves the breaking up of chemical bonds between atoms resulting in the _______ and simultaneously the formation of bonds with the _______ .

Write some physical properties of chlorine gas.

Why iron sometimes has 2 as valency and sometimes three as valency?

What is an atom, atomic mass and atomic number? [3 MARKS]

Which of the following are examples of Radio-isotopes?

What are the uses of thermal decomposition reactions?

The mass of an electron is 9.1110 to the -28 g. How many electron would be required to make 1 g?

34. Are the oxidation state and covalency of Al in [AlCl(H2O)5]2+same?What will be the oxidation state and covalency?How?

What is the molecular mass of CCl4?Given the atomic mass of C=12 u and Cl=35.5 u

A chemical reaction involves the breaking up of chemical bonds between atoms resulting in the _ and simultaneously the formation of bonds with the _ .