Fill in the blanks
1. The increase in solubility of iodine in an aqueous solution of potassium iodide is due to the formation of ___________ . (1982)
2. Galvanization of iron denotes coating with ___________ .(1983)
3. If metal ions of group III are precipitated by NH4Cl and NH4OH without prior oxidation by conc. HNO3 ___________ in not completely precipitated. (1984)
4. Sodium dissolved in liquid ammonia conducts electricity because _________. (1985)
5. Hydrogen gas is liberated by the action of aluminum with concentrated solution of ___________. (1987)
6. Silver chloride is sparingly soluble in water because its lattice energy is greater than __________ energy. (1987)
7. _______ phosphorus is reactive because of its highly strained tetrahedral structure.
8. In extractive metallurgy of zinc, partial fusion of ZnO with coke is called _______ and reduction of the ore to the molten metal is called ____________ .
(smelting, calcining, roasting, sintering) (1988)
9. The salts _________ and _______________ are isostructural.
(FeSO4.7H2O; CuSO4.5H2O; MnSO4.4H2O; ZnSO4.7H2O)
10. ______________ acid gives hypo ____________ ion.
(hydrobromic, hypobromous, perbromic, bromide, bromite, perbromate) (1988)
11. Sulphur acts as ___________ agent in vulcanization of rubber. (1989)
12. The basicity of phosphorus acid (H3PO3) is ____________ . (1990)
13. In P4O10, the number of oxygen atoms bonded to each phosphorus atom is _________ . (1992)
14. The lead chamber process involves oxidation of SO2 by atmospheric oxygen under the influence of __________ as catalyst. (1992)
15. Ca2+ has a smaller ionic radius than K+ because it has __________- . (1993)
16. The formula of the deep red liquid formed on warming dichromate with KCl in concentrated sulphuric acid is ______________ . (1993)
17. The two types of bonds present in B2H6 are covalent and __________ . (194).
18. The type of magnetism exhibited by [Mn(H2O)6] 2+ is ________________ . (1994)
19. One recently discovered allotrope of carbon (e.g., C60) is commonly known as _________ . (1994)
20. Among PCl3, CH3+, NH2-, and NF3, ___________ is least reactive towards water. (1997)
21. A solution of sodium in liquid ammonia at -33˚C conducts electricity. On cooling, the conductivity of this solution ______________ .
22. When an aqueous solution of sodium fluoride is electrolysed, the gas liberated at the anode is ___________ .
23. Silver jewellery items tarnish slowly in the air due to their reaction with ___________. (1997).
24. Compounds that formally contain Pb4+ are easily reduced to Pb2+. The stability of the lower oxidation state is due to _____ . (1997)
answers some time later
Showing posts with label Fill-in-the blanks. Show all posts
Showing posts with label Fill-in-the blanks. Show all posts
Sunday, August 17, 2008
Inorganic Chemistry Past JEE Fill Blanks Questions
Fill in the blanks
1. The increase in solubility of iodine in an aqueous solution of potassium iodide is due to the formation of ___________ . (1982)
2. Galvanization of iron denotes coating with ___________ .(1983)
3. If metal ions of group III are precipitated by NH4Cl and NH4OH without prior oxidation by conc. HNO3 ___________ in not completely precipitated. (1984)
4. Sodium dissolved in liquid ammonia conducts electricity because _________. (1985)
5. Hydrogen gas is liberated by the action of aluminum with concentrated solution of ___________. (1987)
6. Silver chloride is sparingly soluble in water because its lattice energy is greater than __________ energy. (1987)
7. _______ phosphorus is reactive because of its highly strained tetrahedral structure.
8. In extractive metallurgy of zinc, partial fusion of ZnO with coke is called _______ and reduction of the ore to the molten metal is called ____________ .
(smelting, calcining, roasting, sintering) (1988)
9. The salts _________ and _______________ are isostructural.
(FeSO4.7H2O; CuSO4.5H2O; MnSO4.4H2O; ZnSO4.7H2O)
10. ______________ acid gives hypo ____________ ion.
(hydrobromic, hypobromous, perbromic, bromide, bromite, perbromate) (1988)
11. Sulphur acts as ___________ agent in vulcanization of rubber. (1989)
12. The basicity of phosphorus acid (H3PO3) is ____________ . (1990)
13. In P4O10, the number of oxygen atoms bonded to each phosphorus atom is _________ . (1992)
14. The lead chamber process involves oxidation of SO2 by atmospheric oxygen under the influence of __________ as catalyst. (1992)
15. Ca2+ has a smaller ionic radius than K+ because it has __________- . (1993)
16. The formula of the deep red liquid formed on warming dichromate with KCl in concentrated sulphuric acid is ______________ . (1993)
17. The two types of bonds present in B2H6 are covalent and __________ . (194).
18. The type of magnetism exhibited by [Mn(H2O)6] 2+ is ________________ . (1994)
19. One recently discovered allotrope of carbon (e.g., C60) is commonly known as _________ . (1994)
20. Among PCl3, CH3+, NH2-, and NF3, ___________ is least reactive towards water. (1997)
21. A solution of sodium in liquid ammonia at -33˚C conducts electricity. On cooling, the conductivity of this solution ______________ .
22. When an aqueous solution of sodium fluoride is electrolysed, the gas liberated at the anode is ___________ .
23. Silver jewellery items tarnish slowly in the air due to their reaction with ___________. (1997).
24. Compounds that formally contain Pb4+ are easily reduced to Pb2+. The stability of the lower oxidation state is due to _____ . (1997)
answers some time later
1. The increase in solubility of iodine in an aqueous solution of potassium iodide is due to the formation of ___________ . (1982)
2. Galvanization of iron denotes coating with ___________ .(1983)
3. If metal ions of group III are precipitated by NH4Cl and NH4OH without prior oxidation by conc. HNO3 ___________ in not completely precipitated. (1984)
4. Sodium dissolved in liquid ammonia conducts electricity because _________. (1985)
5. Hydrogen gas is liberated by the action of aluminum with concentrated solution of ___________. (1987)
6. Silver chloride is sparingly soluble in water because its lattice energy is greater than __________ energy. (1987)
7. _______ phosphorus is reactive because of its highly strained tetrahedral structure.
8. In extractive metallurgy of zinc, partial fusion of ZnO with coke is called _______ and reduction of the ore to the molten metal is called ____________ .
(smelting, calcining, roasting, sintering) (1988)
9. The salts _________ and _______________ are isostructural.
(FeSO4.7H2O; CuSO4.5H2O; MnSO4.4H2O; ZnSO4.7H2O)
10. ______________ acid gives hypo ____________ ion.
(hydrobromic, hypobromous, perbromic, bromide, bromite, perbromate) (1988)
11. Sulphur acts as ___________ agent in vulcanization of rubber. (1989)
12. The basicity of phosphorus acid (H3PO3) is ____________ . (1990)
13. In P4O10, the number of oxygen atoms bonded to each phosphorus atom is _________ . (1992)
14. The lead chamber process involves oxidation of SO2 by atmospheric oxygen under the influence of __________ as catalyst. (1992)
15. Ca2+ has a smaller ionic radius than K+ because it has __________- . (1993)
16. The formula of the deep red liquid formed on warming dichromate with KCl in concentrated sulphuric acid is ______________ . (1993)
17. The two types of bonds present in B2H6 are covalent and __________ . (194).
18. The type of magnetism exhibited by [Mn(H2O)6] 2+ is ________________ . (1994)
19. One recently discovered allotrope of carbon (e.g., C60) is commonly known as _________ . (1994)
20. Among PCl3, CH3+, NH2-, and NF3, ___________ is least reactive towards water. (1997)
21. A solution of sodium in liquid ammonia at -33˚C conducts electricity. On cooling, the conductivity of this solution ______________ .
22. When an aqueous solution of sodium fluoride is electrolysed, the gas liberated at the anode is ___________ .
23. Silver jewellery items tarnish slowly in the air due to their reaction with ___________. (1997).
24. Compounds that formally contain Pb4+ are easily reduced to Pb2+. The stability of the lower oxidation state is due to _____ . (1997)
answers some time later
Saturday, July 5, 2008
Nuclear Chemistry - Fill Blanks Type
1. An element under [A,Z]M undergoes an α-emission followed by two successive β-emissions. The element formed is __________ . (JEE 1982)
answer: [A-4, Z]M
Refer:
α-emission
β-emission
2. The number of neutrons in the parent nucleus which gives 14N on beta emission is __________ . (JEE 1985)
Answer: 8
Reason: One proton increases to give 7 protons of nitrogen. Hence before beta emission there are 8 neutrons and 6 protons.
3. A radio active nucleus decays emitting one alpha and two beta particles; the daughter nucleus is ___________ of the parent. (JEE 1989)
Answer: isotope
Reason; Z is same but A is different.
answer: [A-4, Z]M
Refer:
α-emission
β-emission
2. The number of neutrons in the parent nucleus which gives 14N on beta emission is __________ . (JEE 1985)
Answer: 8
Reason: One proton increases to give 7 protons of nitrogen. Hence before beta emission there are 8 neutrons and 6 protons.
3. A radio active nucleus decays emitting one alpha and two beta particles; the daughter nucleus is ___________ of the parent. (JEE 1989)
Answer: isotope
Reason; Z is same but A is different.
Surface Chemistry - Fill Blanks Type
1. The absorption of hydrogen by palladium is commonly known as ___________ .
(JEE 1983)
Answer: occlusion
(JEE 1983)
Answer: occlusion
1. 3 g of a salt of molecular weight 30 is dissolved in 250 g of water. The molality of the solution is _____________ . (JEE 1983)
Answer; 0.4 mol kg-
Molality (m) = number of moles of solute/kilograms of solvent
0.1 mol salts dissolved in .25 kg of water. So m = 0.1/.25 = 0.4 mol/kg
2. Given that ΔTf is the depression in freezing point of the solvent in a solution of a non-volatile solute of molality, m, te quantity lim m→0 (ΔTf/m) is equal to _________________ . (JEE 1994)
Answer: Kf
Answer; 0.4 mol kg-
Molality (m) = number of moles of solute/kilograms of solvent
0.1 mol salts dissolved in .25 kg of water. So m = 0.1/.25 = 0.4 mol/kg
2. Given that ΔTf is the depression in freezing point of the solvent in a solution of a non-volatile solute of molality, m, te quantity lim m→0 (ΔTf/m) is equal to _________________ . (JEE 1994)
Answer: Kf
Friday, July 4, 2008
Chemical Equilibrium (Ionic Equilibrium) - Fill Blanks
1. The conjugate base of HSO4- in acqueous solution is_____________.
(JEE 19820)
Answer: SO42-
2. The hydrolysis of ethyl acetate in ______________________ medium is a _________ order reaction.
(JEE 1986)
Answer : acidic, first order
3. ____________ acid gives _____________ ion.
(options given: hydrobromic acid, hypobromous. Perbromic, bromide, bormite, perbromate)
(JEE 1988)
Answer: Hydrobromic acid, bromide (*Refer TMH Chemistry IIT 2007-Table 7.1)
4. For a given reversible reaction, at a fixed temperature equilibrium constants Kp and Kc are related by ____________________ .
(JEE 1994)
Answer : Kp = Kc (RT) Δ vg
4a. Solubility of iodine in water is greatly increased by the addition of iodide ions because of the formation of _______________________. (JEE 1994)
Answer: I3-,
5. A ten fold increase in pressure on the reaction
N2(g) + 3H2(g) ↔ 2NH3(g) at equilibrium results in _____________ in Kp.
(JEE 1996)
Answer: no change
Reason: Kp of an equilibrium reaction is independent of pressure of the system.
6. For a gaseous reaction 2B → A, the equilibrium constant Kp is _____________ to/than Kc.
(JEE 1997)
Answer: smaller
7. In the reaction I- + I2 → I3-, the Lewis acid is _______________ .
(JEE 1997)
Answer: I2
(JEE 19820)
Answer: SO42-
2. The hydrolysis of ethyl acetate in ______________________ medium is a _________ order reaction.
(JEE 1986)
Answer : acidic, first order
3. ____________ acid gives _____________ ion.
(options given: hydrobromic acid, hypobromous. Perbromic, bromide, bormite, perbromate)
(JEE 1988)
Answer: Hydrobromic acid, bromide (*Refer TMH Chemistry IIT 2007-Table 7.1)
4. For a given reversible reaction, at a fixed temperature equilibrium constants Kp and Kc are related by ____________________ .
(JEE 1994)
Answer : Kp = Kc (RT) Δ vg
4a. Solubility of iodine in water is greatly increased by the addition of iodide ions because of the formation of _______________________. (JEE 1994)
Answer: I3-,
5. A ten fold increase in pressure on the reaction
N2(g) + 3H2(g) ↔ 2NH3(g) at equilibrium results in _____________ in Kp.
(JEE 1996)
Answer: no change
Reason: Kp of an equilibrium reaction is independent of pressure of the system.
6. For a gaseous reaction 2B → A, the equilibrium constant Kp is _____________ to/than Kc.
(JEE 1997)
Answer: smaller
7. In the reaction I- + I2 → I3-, the Lewis acid is _______________ .
(JEE 1997)
Answer: I2
Chemical Energetics - Model Questions - Fill Blanks Type
1. The total energy of one mole of an ideal monatomic gas at 27°C is __________ calories. (JEE 1984)
Answer (3/2)RT = (1.5 mol)[1.987 cal/ (K mol.)](300 K) = 894.15 cal.
2. A system is said to be ___________ , if it can neither exchange matter nor energy with the surroundings. (JEE 1993)
Answer: isolated
3. The heat content of the products is more than that of the reactants in an _____________ reaction. (JEE 1993)
Answer: endothermic
4. When Fe (solid) is dissolved in acqueous hydrochloric acid in a closed vessel, the work done is _________________ . (JEE 1997)
Answer: zero
5. Enthalpy is an ____________ property. (JEE 1997)
Answer: extensive property.
It depends on mass of the substance
Answer (3/2)RT = (1.5 mol)[1.987 cal/ (K mol.)](300 K) = 894.15 cal.
2. A system is said to be ___________ , if it can neither exchange matter nor energy with the surroundings. (JEE 1993)
Answer: isolated
3. The heat content of the products is more than that of the reactants in an _____________ reaction. (JEE 1993)
Answer: endothermic
4. When Fe (solid) is dissolved in acqueous hydrochloric acid in a closed vessel, the work done is _________________ . (JEE 1997)
Answer: zero
5. Enthalpy is an ____________ property. (JEE 1997)
Answer: extensive property.
It depends on mass of the substance
Tuesday, July 1, 2008
Chemical Bonding - 11 - Fill in the Blanks Type Questions
Fill in the blanks
1. There are ____________________ π (pi) bonds in a nitrogen molecule. (JEE 1982)
Anwer : 2
2. __________ hybrid orbitals of nitrogen are involved in the formation of ammonium ion. (JEE 1982)
Answer sp³
3. The terminal carbon atom in butane is _____________ hybridized. (JEE 1985)
Answer sp³
The shape of [CH3] + is ------------------------.
(JEE 1990)
Answer: Triangular planar
The valence atomic orbitals of carbon in silver acetylide is _________________.
(JEE 1990)
Answer: sp
IN P4O10, the number of oxygen atoms bonded to each phosphorus atom is ____________ .
(JEE 1992)
Answer: 4
When N2 goes to N2+
The N—N bond distance _________ and when O2 goes to )2+, the O—O bond distance ______________.
(JEE 1996)
Answer: increases, decreases
1. There are ____________________ π (pi) bonds in a nitrogen molecule. (JEE 1982)
Anwer : 2
2. __________ hybrid orbitals of nitrogen are involved in the formation of ammonium ion. (JEE 1982)
Answer sp³
3. The terminal carbon atom in butane is _____________ hybridized. (JEE 1985)
Answer sp³
The shape of [CH3] + is ------------------------.
(JEE 1990)
Answer: Triangular planar
The valence atomic orbitals of carbon in silver acetylide is _________________.
(JEE 1990)
Answer: sp
IN P4O10, the number of oxygen atoms bonded to each phosphorus atom is ____________ .
(JEE 1992)
Answer: 4
When N2 goes to N2+
The N—N bond distance _________ and when O2 goes to )2+, the O—O bond distance ______________.
(JEE 1996)
Answer: increases, decreases
Subscribe to:
Posts (Atom)