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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.
| 2801. |
What happens when an orbital is put in external magnetic and electric field? Why bohr cannot explain it? |
| Answer» What happens when an orbital is put in external magnetic and electric field? Why bohr cannot explain it? | |
| 2802. |
What method will you use to separate ethanol from a mixture of ethanol (boiling point 78°C) and water (boiling point 100°C)? |
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Answer» What method will you use to separate ethanol from a mixture of ethanol (boiling point 78°C) and water (boiling point 100°C)? |
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| 2803. |
(a) If you have to choose between two thin blankets and a thick blanket on a cold winter night, which one will you choose? (b) Stainless steel pans are usually provided with copper bottoms. Why? (c) You may have noticed that a few sharp jerks are given to a clinical thermometer before using it. Why is it done so?[5 MARKS] |
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Answer» (a) If you have to choose between two thin blankets and a thick blanket on a cold winter night, which one will you choose? (b) Stainless steel pans are usually provided with copper bottoms. Why? (c) You may have noticed that a few sharp jerks are given to a clinical thermometer before using it. Why is it done so? [5 MARKS] |
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| 2804. |
Which of the following metals float in their reactions with cold water? |
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Answer» Which of the following metals float in their reactions with cold water? |
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| 2805. |
Why is there variation of colour in the flame of the burning candle? Mention the temperature and type of combustion taking place in the various zones of a candle flame. |
| Answer» Why is there variation of colour in the flame of the burning candle? Mention the temperature and type of combustion taking place in the various zones of a candle flame. | |
| 2806. |
Which of the following is the lightest element among the following elements? |
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Answer» Which of the following is the lightest element among the following elements? |
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| 2807. |
which compound has a structure similar to diamond |
| Answer» which compound has a structure similar to diamond | |
| 2808. |
What does the abbreviation amu stand for? |
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Answer» What does the abbreviation amu stand for? |
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| 2809. |
Lavoisier and Priestly named the same gas ______ and __________ respectively. |
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Answer» Lavoisier and Priestly named the same gas ______ and __________ respectively. |
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| 2810. |
Which of the following is formed when sodium hydroxide reacts with the hydrochloric acid? |
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Answer» Which of the following is formed when sodium hydroxide reacts with the hydrochloric acid? |
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| 2811. |
72. Compare bond length of c-c and si-si?? |
| Answer» 72. Compare bond length of c-c and si-si?? | |
| 2812. |
which of the following compound can from a zwitterion |
| Answer» which of the following compound can from a zwitterion | |
| 2813. |
Why fire is having colour ? And why sun is red if it produces white light? |
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Answer» Why fire is having colour ? And why sun is red if it produces white light? |
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| 2814. |
Question 4Buckminsterfullerene is allotropic form of(a) Phosphorus(b) Sulphur(c) Carbon(d) Tin |
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Answer» Question 4 Buckminsterfullerene is allotropic form of (a) Phosphorus (b) Sulphur (c) Carbon (d) Tin |
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| 2815. |
Why hydrogen gas is non Metal if it loses electron |
| Answer» Why hydrogen gas is non Metal if it loses electron | |
| 2816. |
(a) What is the difference between washing soda and baking soda?(b) Write the chemical formula for bleaching powder. How is bleaching powder prepared? For what purpose is it used in paper factories? |
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Answer» (a) What is the difference between washing soda and baking soda? (b) Write the chemical formula for bleaching powder. How is bleaching powder prepared? For what purpose is it used in paper factories? |
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| 2817. |
निम्नलिखितप्रश्न का उत्तर(50-60 शब्दोंमें)लिखिए−वज़ीर अली एक जाँबाज़ सिपाही था,कैसे? स्पष्ट कीजिए। |
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Answer» निम्नलिखितप्रश्न का उत्तर(50-60 शब्दोंमें)लिखिए− वज़ीर अली एक जाँबाज़ सिपाही था,कैसे? स्पष्ट कीजिए। |
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| 2818. |
Oxygen _________ combustion and is _________ itself. |
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Answer» Oxygen _________ combustion and is _________ itself. |
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| 2819. |
When 5lt. of a gas mixture of methane n propane is perfectly combusted at 0^°C and 1atm , 16 lt. of O2 at the same temp. nd pressure is consumed . the amt. of heat released from this combustion in kj is ( delta H combustion (CH4) =890kj/mol , delta H combustion (C3H8)=2220Kj/mol |
| Answer» When 5lt. of a gas mixture of methane n propane is perfectly combusted at 0^°C and 1atm , 16 lt. of O2 at the same temp. nd pressure is consumed . the amt. of heat released from this combustion in kj is ( delta H combustion (CH4) =890kj/mol , delta H combustion (C3H8)=2220Kj/mol | |
| 2820. |
Based on the following information arrange four metals A,B,C and D in order of decreasing ability to act as reducing agents:(I) Only A,B and C react with 1M HCl to give H2(g)(II) When C is added to solutions of the other metal ions, metallic B and D are formed (III) Metal C does not reduce An+ |
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Answer» Based on the following information arrange four metals A,B,C and D in order of decreasing ability to act as reducing agents: |
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| 2821. |
Question 12 (b)Give reason why sodium, potassium and lithium are stored in oil? |
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Answer» Question 12 (b) |
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| 2822. |
Write short notes on: (a) Teflon (b) Plastic cookware (c) Melamine [3 MARKS] |
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Answer» Write short notes on: (a) Teflon (b) Plastic cookware (c) Melamine [3 MARKS] |
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| 2823. |
Combine related points. |
| Answer» Combine related points. | |
| 2824. |
Why are girls made up of metals and not from? (Could you please check my answer) Ans: when a bell is struck we get a ringing sound it is a property of metal known as sonorous. nonmetals are non sonorous. they do not produce such ringing sound wood is a non metal and it is also not sonorous. Thus Bells are made up of metal |
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Answer» Why are girls made up of metals and not from? (Could you please check my answer) Ans: when a bell is struck we get a ringing sound it is a property of metal known as sonorous. nonmetals are non sonorous. they do not produce such ringing sound wood is a non metal and it is also not sonorous. Thus Bells are made up of metal |
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| 2825. |
Give two examples each of, biodegradable and non-biodegradable material. [2 MARKS] |
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Answer» Give two examples each of, biodegradable and non-biodegradable material. [2 MARKS] |
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| 2826. |
Which one is classified as a condensation polymer? |
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Answer» Which one is classified as a condensation polymer? |
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| 2827. |
To make gunpowder, carbon, sulphur and potassium nitrate are to be mixed in the ratio 3 : 2 : 1. To make 1.2 kilograms of gunpowder, how much of each is needed? |
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Answer» To make gunpowder, carbon, sulphur and potassium nitrate are to be mixed in the ratio 3 : 2 : 1. To make 1.2 kilograms of gunpowder, how much of each is needed? |
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| 2828. |
With reference to bio-diesel revolution, consider the following statements:- Which of the statement(s) given above is/are correct? |
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Answer» With reference to bio-diesel revolution, consider the following statements:- Which of the statement(s) given above is/are correct? |
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| 2829. |
Give reasons. (a) Water is not used to control fires involving electrical equipment.(b) LPG is a better domestic fuel than wood.(c) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminum pipe does not. |
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Answer» Give reasons. (a) Water is not used to control fires involving electrical equipment. (b) LPG is a better domestic fuel than wood. (c) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminum pipe does not. |
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| 2830. |
When we connect a potato to a cell, the part connected to the positive terminal has green coloration. Why is it only on the part connected to the positive terminal and not on the negative side? |
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Answer» When we connect a potato to a cell, the part connected to the positive terminal has green coloration. Why is it only on the part connected to the positive terminal and not on the negative side? |
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| 2831. |
why are cathode rays independent on gas taken unlike thatof anode ray ^{ |
| Answer» why are cathode rays independent on gas taken unlike thatof anode ray ^{ | |
| 2832. |
20. Lithium (Li2) , Boron (B2) , Flourine (F2) each has bond order equal to one. The correct order of stability is: 1) B2> F2> Li2 2) B2> Li2> F2 3) F2> B2> Li2 4) F2> Li2> B2 |
| Answer» 20. Lithium (Li2) , Boron (B2) , Flourine (F2) each has bond order equal to one. The correct order of stability is: 1) B2> F2> Li2 2) B2> Li2> F2 3) F2> B2> Li2 4) F2> Li2> B2 | |
| 2833. |
Uses of CNG are: |
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Answer» Uses of CNG are: |
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| 2834. |
Hydrogen is placed along with Alkali metals in the modern periodic tablethough it shows non-metallic character |
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Answer» Hydrogen is placed along with Alkali metals in the modern periodic table though it shows non-metallic character |
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| 2835. |
An aqueous solution is 1m in ki. Which change will cause the vapour pressure of the solution to increase? 1 addition of nacl 2 addition of na2so4 3 addition of 1 m ki 4 addition of water |
| Answer» An aqueous solution is 1m in ki. Which change will cause the vapour pressure of the solution to increase? 1 addition of nacl 2 addition of na2so4 3 addition of 1 m ki 4 addition of water | |
| 2836. |
What is importance of gram equivalent mass in chemistry |
| Answer» What is importance of gram equivalent mass in chemistry | |
| 2837. |
Which of the following is correct about a saturated solution ? |
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Answer» Which of the following is correct about a saturated solution ? |
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| 2838. |
93.what is the difference between of reducing power of sodiumborohydrate lithiumaluminiumhydrate |
| Answer» 93.what is the difference between of reducing power of sodiumborohydrate lithiumaluminiumhydrate | |
| 2839. |
One of the following is not a combustible susbtance. This one is : (a) alcohol (b) hydrogen (c) asbestos (d) chaff |
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Answer» One of the following is not a combustible susbtance. This one is : (a) alcohol (b) hydrogen (c) asbestos (d) chaff |
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| 2840. |
what is the meaning of reactivity series? |
| Answer» what is the meaning of reactivity series? | |
| 2841. |
Question 42.When zinc metal is treated with a dilute solution of a strong acid, a gas is evolved, which is utilised in the hydrogenation of oil. Name the gas evolved. Write the chemical equation of the reaction involved and also write a test to detect the gas formed. |
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Answer» Question 42. When zinc metal is treated with a dilute solution of a strong acid, a gas is evolved, which is utilised in the hydrogenation of oil. Name the gas evolved. Write the chemical equation of the reaction involved and also write a test to detect the gas formed. |
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| 2842. |
Write the equations for each of the following reactions and name the reactants and products of each.(a) Coal was burnt in air.(b) Magnesium wire was lit.(c) Dilute hydrochloric acid was poured on to some zinc.(d) Water was poured on calcium oxide. |
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Answer» Write the equations for each of the following reactions and name the reactants and products of each. (a) Coal was burnt in air. (b) Magnesium wire was lit. (c) Dilute hydrochloric acid was poured on to some zinc. (d) Water was poured on calcium oxide. |
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| 2843. |
Plastic bottles are commonly made of PET. What does PET stands for? |
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Answer» Plastic bottles are commonly made of PET. What does PET stands for? |
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| 2844. |
Which of the following is necessary for combustion? |
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Answer» Which of the following is necessary for combustion? |
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| 2845. |
The data for the reaction is A + B → C is Exp.[A]0[B]0Initial rate10.0120.0350.1020.0240.0350.8030.0120.0700.1040.0240.0700.80 |
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Answer» The data for the reaction is A + B → C is Exp.[A]0[B]0Initial rate10.0120.0350.1020.0240.0350.8030.0120.0700.1040.0240.0700.80 |
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| 2846. |
Why is nylon used in manufacturing of seat belts? |
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Answer» Why is nylon used in manufacturing of seat belts? |
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| 2847. |
How can you observe the three forms of water in (i) nature(ii) at home |
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Answer» How can you observe the three forms of water in (i) nature (ii) at home |
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| 2848. |
Unscramble the jumbled words given below, related to synthetic materials.(a) anory (b) lopmery (c) relyteen (d) laspict(e) yespolter (f) felton |
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Answer» Unscramble the jumbled words given below, related to synthetic materials. (a) anory (b) lopmery (c) relyteen (d) laspict (e) yespolter (f) felton |
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| 2849. |
consider the following chemical reactions 1)CaC2(s) + 2H2O(l) → Ca(OH)2(s) +C2H2(g) 2)CaCO3(s) → CaO(s) + CO2(g) 3)2Fe(s) + 3H2O(g)→ Fe2O3(s) + 3H2(g) work done by the system in the cases of a)1,2 b)1,2,3 c)1 d) |
| Answer» consider the following chemical reactions 1)CaC2(s) + 2H2O(l) → Ca(OH)2(s) +C2H2(g) 2)CaCO3(s) → CaO(s) + CO2(g) 3)2Fe(s) + 3H2O(g)→ Fe2O3(s) + 3H2(g) work done by the system in the cases of a)1,2 b)1,2,3 c)1 d) | |
| 2850. |
The slow process by which the large land plants and trees buried deep under the earth have become coal is called : (a) carbonation (b) carburation (c) carbonisation (d) carbocation |
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Answer» The slow process by which the large land plants and trees buried deep under the earth have become coal is called : (a) carbonation (b) carburation (c) carbonisation (d) carbocation |
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