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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 3801. |
Using ammonium hydroxide, how would you distinguish between the following pairs of ions in solution:(a) Ferrous ion and Ferric ion.(b) Zinc ion and Lead ion. |
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Answer» Using ammonium hydroxide, how would you distinguish between the following pairs of ions in solution: (a) Ferrous ion and Ferric ion. (b) Zinc ion and Lead ion. |
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| 3802. |
why s block and p block element formed compounds are colourless and white ? |
| Answer» why s block and p block element formed compounds are colourless and white ? | |
| 3803. |
What happens when(a) NH3 solution is added to CuSO4 solution drop by drop and then in excess.(b) Caustic soda solution is added to Cu(NO3)2 solution and product boiled.(c) Common salt solution added to silver nitrate solution and NH3 solution added to it.(d) Lead nitrate solution treated with calcium chloride solution and products are heated and cooled. |
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Answer» What happens when (a) NH3 solution is added to CuSO4 solution drop by drop and then in excess. (b) Caustic soda solution is added to Cu(NO3)2 solution and product boiled. (c) Common salt solution added to silver nitrate solution and NH3 solution added to it. (d) Lead nitrate solution treated with calcium chloride solution and products are heated and cooled. |
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| 3804. |
In the laboratory preparation of nitric acid, it can be obtained below 200∘C or above 200∘C, but the lower temperature is preferred. Give at least two reasons. [2 MARKS] |
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Answer» In the laboratory preparation of nitric acid, it can be obtained below 200∘C or above 200∘C, but the lower temperature is preferred. Give at least two reasons. [2 MARKS] |
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| 3805. |
How many of total metals that are given below can displace hydrogen from sulphuric acid? Sodium, potassium, iron, gold, lead and silver.4 |
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Answer» How many of total metals that are given below can displace hydrogen from sulphuric acid? Sodium, potassium, iron, gold, lead and silver.
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| 3806. |
Two substances A and B react to give a salt. It is also given that substance A has sour taste. Which of the following is true? |
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Answer» Two substances A and B react to give a salt. It is also given that substance A has sour taste. Which of the following is true? |
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| 3807. |
Water soluble bases are called: |
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Answer» Water soluble bases are called: |
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| 3808. |
Concentrated nitric acid, upon long standing, turns yellow-brown due to formation of : |
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Answer» Concentrated nitric acid, upon long standing, turns yellow-brown due to formation of : |
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| 3809. |
12. Why the vapour pressure of a liquid increases with temperature? |
| Answer» 12. Why the vapour pressure of a liquid increases with temperature? | |
| 3810. |
Which of the following are exothermic processes?I. Melting ice cubesII. RespirationIII. Burning of a candleIV. Evaporation of water |
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Answer» Which of the following are exothermic processes? I. Melting ice cubes II. Respiration III. Burning of a candle IV. Evaporation of water |
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| 3811. |
Why B(OH)3 is a acid instead of having OH- ions in it? |
| Answer» Why B(OH)3 is a acid instead of having OH- ions in it? | |
| 3812. |
(a) How does the chemical reactivity of alkali metals vary on going down in group 1 of the periodic table? (b) How does the chemical reactivity of the halogens vary on going down in group 17 of the periodic table? |
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Answer» (a) How does the chemical reactivity of alkali metals vary on going down in group 1 of the periodic table? (b) How does the chemical reactivity of the halogens vary on going down in group 17 of the periodic table? |
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| 3813. |
A compound of X and Y has equal mass of them. If their atomic weights are 30 and 20 respectively. Molecular formula of that compound (its mol wt. is 120) could be what |
| Answer» A compound of X and Y has equal mass of them. If their atomic weights are 30 and 20 respectively. Molecular formula of that compound (its mol wt. is 120) could be what | |
| 3814. |
Mole fraction of the solute in a 1.00 molal aqueous solution is |
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Answer» Mole fraction of the solute in a 1.00 molal aqueous solution is |
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| 3815. |
Which metal will not react with oxygen at high temperature a. Zn. b. Ag c. Fe d. Al |
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Answer» Which metal will not react with oxygen at high temperature a. Zn. b. Ag c. Fe d. Al |
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| 3816. |
What mass of iron will be obtained in pure state from 100 kg of an iron ore containing 90% Fe2O3? 1)70Kg. 2) 63 Kg 3) 85Kg 4) 75 Kg |
| Answer» What mass of iron will be obtained in pure state from 100 kg of an iron ore containing 90% Fe2O3? 1)70Kg. 2) 63 Kg 3) 85Kg 4) 75 Kg | |
| 3817. |
20 ml of a mixture of CO and H2 were mixed with excess of O2 and exploded and cooled. There was a volume contraction of 18 ml. All volume measurements corresponds to room temperature and one atmospheric pressure then what is volume ratio V1:V2 of CO and H2 in original mixture |
| Answer» 20 ml of a mixture of CO and H2 were mixed with excess of O2 and exploded and cooled. There was a volume contraction of 18 ml. All volume measurements corresponds to room temperature and one atmospheric pressure then what is volume ratio V1:V2 of CO and H2 in original mixture | |
| 3818. |
Lone pair effect occurs in which type of compounds? |
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Answer» Lone pair effect occurs in which type of compounds? |
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| 3819. |
Define the following terms: 1. Matrix 2. Flux 3. Slag |
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Answer» Define the following terms: 1. Matrix 2. Flux 3. Slag |
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| 3820. |
What were the names used to denote the existance of undiscovered elements such as gallium and germanium respectively? |
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Answer» What were the names used to denote the existance of undiscovered elements such as gallium and germanium respectively? |
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| 3821. |
From the formulae listed below, choose, one, corresponding to the salt having the given description:AgCl, CuCO3, CuSO4.5H2O, KNO3, NaCl, NaHSO4, Pb(NO3)2, ZnCO3, ZnSO4.7H2O. On heating this, salt changes from green to black. |
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Answer» From the formulae listed below, choose, one, corresponding to the salt having the given description: AgCl, CuCO3, CuSO4.5H2O, KNO3, NaCl, NaHSO4, Pb(NO3)2, ZnCO3, ZnSO4.7H2O. On heating this, salt changes from green to black. |
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| 3822. |
State whether each of the above reactions is an example of thermal decomposition or thermal dissociation. |
| Answer» State whether each of the above reactions is an example of thermal decomposition or thermal dissociation. | |
| 3823. |
AH2(g)+BV2O5(s)→CV2O3(s)+DH2O(l)A, B, C and D are the coefficients in the reaction given above. Identify the correct relation between these coefficients so that the reaction is balanced? |
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Answer» AH2(g)+BV2O5(s)→CV2O3(s)+DH2O(l) A, B, C and D are the coefficients in the reaction given above. Identify the correct relation between these coefficients so that the reaction is balanced? |
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| 3824. |
What is the homologous series of alcohols, aldehyde, ketones, and carboxylic acid ? |
| Answer» What is the homologous series of alcohols, aldehyde, ketones, and carboxylic acid ? | |
| 3825. |
What is periodic table.Show the periodic table also |
| Answer» What is periodic table.Show the periodic table also | |
| 3826. |
Why should water be never added dropwise to concentrated sulphuric acid ? |
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Answer» Why should water be never added dropwise to concentrated sulphuric acid ? |
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| 3827. |
Write the balanced chemical equation for a reaction in which ammonia is oxidised by the following.(i) A metal oxide(ii) A gas which is not oxygen. |
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Answer» Write the balanced chemical equation for a reaction in which ammonia is oxidised by the following. (i) A metal oxide (ii) A gas which is not oxygen. |
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| 3828. |
Ch3ch2ch(oh)ch3 in presence of PBr3 and Mg gives A and A in presence of ch3ch2cho gives B What is A and B |
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Answer» Ch3ch2ch(oh)ch3 in presence of PBr3 and Mg gives A and A in presence of ch3ch2cho gives B What is A and B |
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| 3829. |
Isomers have same molecular formula but different .............. formula. |
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Answer» Isomers have same molecular formula but different .............. formula. |
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| 3830. |
In ionic solids.in AB type In Rock salt structure y do v only count the Cl ions at the face center n not the Cl ions at the edges while finding the coordination no.of Na |
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Answer» In ionic solids.in AB type In Rock salt structure y do v only count the Cl ions at the face center n not the Cl ions at the edges while finding the coordination no.of Na |
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| 3831. |
__ (electrolytic dissociation/ electrolytic ionisation) is the process due to which an ionic compound dissociates into ions in the fused state or in aqueous solution. |
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Answer» |
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| 3832. |
Name the organisms belonging to the second and the fourth trophic levels in the food chain comprising the following: Frogs, Plants, Snakes, Hawk, Insects |
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Answer» Name the organisms belonging to the second and the fourth trophic levels in the food chain comprising the following: Frogs, Plants, Snakes, Hawk, Insects |
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| 3833. |
A charge cloud system produces an electric field in air near the earths surface . A particle of charge -2×10^-9 C is acted on by a downward electrostatic force 3 × 10 ^-6 Nwhen placed in this field .The gravitational and electrostatic force respectively,exerted on a proton placed in this field are. IN THIS QUES WHY CANT WE USE (F=GMm/R ^2) FOR GRAVITATIONAL FORCE? |
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Answer» A charge cloud system produces an electric field in air near the earths surface . A particle of charge -2×10^-9 C is acted on by a downward electrostatic force 3 × 10 ^-6 Nwhen placed in this field .The gravitational and electrostatic force respectively,exerted on a proton placed in this field are. IN THIS QUES WHY CANT WE USE (F=GMm/R ^2) FOR GRAVITATIONAL FORCE? |
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| 3834. |
The average molecular mass of a mixture of gas containing nitrogen and carbon dioxide is 36. A mixture contains 28 gram of Nitrogen therefore, the amount of CO2 present in the mixture is |
| Answer» The average molecular mass of a mixture of gas containing nitrogen and carbon dioxide is 36. A mixture contains 28 gram of Nitrogen therefore, the amount of CO2 present in the mixture is | |
| 3835. |
Why fats and oils should be stored properly in airtight containers |
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Answer» Why fats and oils should be stored properly in airtight containers |
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| 3836. |
Two volumes of ethane at STP will need ______ volumes of oxygen at STP for complete combustion. |
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Answer» Two volumes of ethane at STP will need ______ volumes of oxygen at STP for complete combustion. |
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| 3837. |
Between NH3 and N2 which has more vanderwaal constant b? |
| Answer» Between NH3 and N2 which has more vanderwaal constant b? | |
| 3838. |
According to Arrhenius, acid generates _____ ions in water. |
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Answer» According to Arrhenius, acid generates _____ ions in water. |
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| 3839. |
Why is the size of Li^+ greater than Mg^2+ |
| Answer» Why is the size of Li^+ greater than Mg^2+ | |
| 3840. |
Why does bleaching powder deturates on exposure to air? |
| Answer» Why does bleaching powder deturates on exposure to air? | |
| 3841. |
Which of the following quantum number set is impossible: |
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Answer» Which of the following quantum number set is impossible: |
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| 3842. |
How nitrous acid is both an oxidising agent and a reducing agent ? |
| Answer» How nitrous acid is both an oxidising agent and a reducing agent ? | |
| 3843. |
Question 16 Which one of the following processes involves chemical reactions? (a) Storing of oxygen gas under pressure in a gas cylinder. (b) Liquefaction of air. (c) Keeping petrol in a china dish in the open. (d) Heating copper wire in presence of air at high temperature. |
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Answer» Question 16 Which one of the following processes involves chemical reactions? (a) Storing of oxygen gas under pressure in a gas cylinder. (b) Liquefaction of air. (c) Keeping petrol in a china dish in the open. (d) Heating copper wire in presence of air at high temperature. |
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| 3844. |
20.An equilibrium mixture at 300K contains N2O4 and NO2 at 0.28 and 1.1 atm pressure respectively. If the volume of the container is doubled, calculate the new equilibrium pressure of two gases a)0.095,0.64 b)0.95,0.064 c)0.95,0.64 d)0.95,0.028 |
| Answer» 20.An equilibrium mixture at 300K contains N2O4 and NO2 at 0.28 and 1.1 atm pressure respectively. If the volume of the container is doubled, calculate the new equilibrium pressure of two gases a)0.095,0.64 b)0.95,0.064 c)0.95,0.64 d)0.95,0.028 | |
| 3845. |
are alkanes, alkenes, alkynes functional groups. give reason |
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Answer» are alkanes, alkenes, alkynes functional groups. give reason |
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| 3846. |
In addition to wheat plants, a crop field ecosystem has organisms such as snake, peacock, eagle and mice. If the wheat plants are sprayed with pesticides periodically, which of the following will have the minimum concentration of pesticides in the body? (a) Snake (b) Eagle (c) Mice (d) Peacock |
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Answer» In addition to wheat plants, a crop field ecosystem has organisms such as snake, peacock, eagle and mice. If the wheat plants are sprayed with pesticides periodically, which of the following will have the minimum concentration of pesticides in the body? (a) Snake (b) Eagle (c) Mice (d) Peacock |
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| 3847. |
Molten sodium chloride conducts electricity due to the presence of: |
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Answer» Molten sodium chloride conducts electricity due to the presence of: |
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| 3848. |
How much copper is deposited on cathode if a current of 3A is passed through aq cuso4 solution for 15 min |
| Answer» How much copper is deposited on cathode if a current of 3A is passed through aq cuso4 solution for 15 min | |
| 3849. |
What will be the product formed when Sodium reacts with water? |
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Answer» What will be the product formed when Sodium reacts with water? |
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| 3850. |
When a conducting soap bubble is negatively charged |
| Answer» When a conducting soap bubble is negatively charged | |