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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.
| 1201. |
A ও B দুটি যৌগ টিন ও অক্সিজেন দ্বারা গঠিত।A যৌগের 78.77% টিন এবং 21.23% অক্সিজেন আছে। B যৌগে 88.12% টিন এবং 11.88% অক্সিজেন আছে। দেখাও যে,ফলাফল গুলি গুনানুপাত সূত্র সংগত |
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| 1202. |
The rate of reaction a products is 10 mole /lit/min at time t1 = 2 min. what will be the rate in mole/lit/min at time t2 =12 min NEET 20161) more than 102) 103) lesser than 104) 20 |
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| 1203. |
What is your opinion about rapid expantion of gases cause coolingbout |
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Answer» Answer: The frequency of atomic collisions DECREASE as air expands, therefore the air gets cooler. Temperature is just the average heat of a substance. ... As the energy needed to increase it's temperature must be supplied from SOMEWHERE, the GAS takes the energy from the surrounding system giving the effect of cooling Explanation: please mark as BRAINLIEST |
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| 1204. |
A compound has the formula xf2 and has relative mass of ,70 what is element x? |
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| 1205. |
How to separate beetles from a bag and flour |
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Answer» Explanation: Freeze and kill it: It is advised to KEEP packets of spices and flour in the freezer for four days as soon as you have bought it. You can do this to flour, oats, cookies, corn meal, and spices. This will kill all the larvae and eggs (if) present inside the packet and will stop further infestation. Take it out and store it in the normal place. Bay or neem leaves: Bay leaf is one of the best remedies to get rid of beetles. Bay or neem leaves can be put inside loose flour in containers that are more prone to contamination. CLOVES: This is a great idea if you are living alone and have faced this problem for the first time. Cloves are widely available and will fight off the bugs and will also AVOID their infestation. You can also sprinkle some cloves around your cupboard shelves and pantry area. Matchbox: Sounds weird but it is a great way to REPEL weevils as matchbooks contain sulphur and sulphur is not liked by weevils. Keep the matchbox open near the grains and weevils will not be seen thereabouts. You may also keep small bags of black pepper in your pantry. Keep the infested grains in sunlight: If a large quantity of flour has been attacked by beetles, just keep it in the sunlight. This will shoo them away as these bugs do not like the sunlight and will look for a dark and moist place. Keep the contaminated flour in the sunlight for a day and you get rid of weevils easily. Other home remedies: You can either put ginger, GARLIC or a whole turmeric inside rice container to keep rice bugs away. |
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| 1206. |
How will you separate The components of black ink? {Diagram} |
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Answer» by chromatography Explanation: using thin layer chromatography TECHNIQUE you can SEPARATE components |
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| 1207. |
Which Of The Following Substance is unable undergo Sublimation camphor common salt dryice Naphelene |
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Answer» SODA ash don't UNDERGO SUBLIMATION. → For EXAMPLE, camphor, dry ice ungergo sublimation. ♡──━━━━━━⊱✿⊰━━━━━━──♡ |
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| 1208. |
if in a sanitizer 20g of alcohol present in 100ml of water, calculate concentration of that sanitizer (v/v%) |
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Answer» here your answer be HAPPY |
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| 1209. |
Calculate the volume of Oxygen gas at 17°C and 800 torr that may be obtained by complete decomposition of 50.5 g of KNO3. (Atomic mass; K = 39, N =14, O = 16) (8) 2KNO3 = 2KNO2 + O2 |
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Answer» Answer: Answer Correct option is 101 g S+O ⟶SO 2
MOLES of S = 32g/mol 16g =0.5 mol 0.5 mol of S requires 0.5 mol of oxygen. So, we know that sulphur burns in 0.5 mol oxygen. The thermal decomposition of Pottasium nitrate: 2KNO ⟶2KNO 2 +O 2
1 mol of O 2 is produced by 2 mol of KNO 3
0.5mol of O 2 will be produced by 1 mol of KNO 3
Thus, 1 mole of KNO 3 is REQUIRED to produce the given amount of oxygen. 1 mol of KNO 3 = molar mass of KNO 3 =101 g Hence, option B is correct |
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| 1210. |
Ic (b) Highest boiling points are shown by: a)Ethers c) Dihydricalcohols b)Monohydric alcohols d)Trihydric alcohols |
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Answer» TRIHYDRIC alcohols please MARK me BRAIN mark LIST
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| 1211. |
Which one of the following follows the correct order of energya)1s2p |
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Answer» first C then a then b Explanation: |
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| 1212. |
Which is more basic in character? (a) H2O (e) Ar-OH (b) R-OH (d) R-O-R |
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Answer» -0H ʘ‿ʘitz ARPAN here ✌.. |
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| 1213. |
Correct order of Melting Point |
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Answer» melting POINT is the temperature at which a solid changes into a liquid. boiling point is the temperature at which a liquid changes into a GAS. |
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| 1214. |
Q6) State which of the following ions or radicals given below of non-metallic elements exhibit valency: 1- , 2- & 3-(a) Chloride(b) Bromide(c) Iodide(d) Nitrate(e) Hydroxide(f) Bicarbonate(g) Bisulphite(h) Bisulphate(i) Aluminate(j) Permanganate(k) Oxide(l) Sulphide(m) Sulphite(n) Sulphate(o) Carbonate(p) Dichromate(q) Zincate(r) Plumbite(s) Phosphate(t) Nitrideplease do it clearly and understandable. I will mark u as branliest. |
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| 1215. |
What is the molecular formula of caocl2 class 11 |
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Answer» Answer: CALCIUM hypochlorite is KNOWN as BLEACHING powder its molecular FORMULA is Ca(OCl)2. |
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| 1216. |
Reaction of butane with chlorine?? |
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Answer» The chlorine radical reacts with a hydrogen attached directly to a carbon in an alkane. Chlorine can REACT with any of the hydrogens that are attached to the FOUR carbons in BUTANE. ... For EXAMPLE a carbon with three bound hydrogens has one more hydrogen available for reaction than a carbon with two bound hydrogens. |
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| 1217. |
What reaction is itHexane+oxygen - carbon dioxide+water Calcium carbonate - calcium oxide+carbon dioxideMagnesium+copper oxide - magnesium oxide+copper Hydrochloric acid+sodium hydroxide - sodium chloride+water |
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| 1218. |
Effect of Temperature on weak acid and weak base. |
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Answer» pH DECREASES with increase in TEMPERATURE. But this does not mean that WATER becomes more acidic at higher temperatures. A solution is considered as acidic if there is an EXCESS of hydrogen ions over hydroxide ions. Explanation: |
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| 1219. |
2. Immediately after conducting an eye checkup. Imran found that he is suffering from long-sightedness. What could be the cause of this defect? a. Increase of focal length of eye lens b. Shortening of eye ball c. Both a and b d. None of the above |
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Answer» a is the CORRECT answer THANK you |
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| 1220. |
What is the group number of lithium |
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Answer» Explanation: |
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| 1222. |
O2+orocNeonst equation for zo(aq) + 2€ + 2016is E(22+201) dbonil to 39000b got tozin100.0 2 ciotulozio |
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Answer» Answer: 2NO+O →2NO 2
− 2 1
dt d[NO] = dt −d[O 2 ] = 2 1
dt d[NO 2 ]
dt −d[O 2 ] =16ℊmin −1 = 16 16 molmin −1 =1molmin −1
dt d[NO 2 ] =2× dt −d[O 2 ] =2×1=2mol/min No. of MOLES= mol.WT weight
2×Mol. wt of NO 2 =wt 2×46= wt ⇒Weight of NO 2 =92ℊ Rate of appearance of NO 2 =92ℊ/min≈90ℊ/min |
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| 1223. |
Show the relationship between health and population with relatable example |
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Answer» RAPID population growth and density is correlated with infections, such as tuberculosis and social pathology, such as schizophrenia. The relationship between HEALTH and fertility is complex, since in the absence of FAMILY planning, improved health decreases mortality and morbidity, and INCREASE fertile life SPAN. |
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| 1224. |
Q. write the terms for numbers in the below figure |
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| 1226. |
Suggest a chemical reaction in which you observe both: evolution of gas and change of colour. Write the reaction and in chemical equation and word equation form |
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Answer» Answer: Here's your answer Explanation: You have limited access to toppr answr. SIGN to unlock 35 lakh questions What's your doubt? 10th >Chemistry >CHEMICAL Reactions and Equations >Chemical equation >Give one example each of a ... Chemistry Bookmark Give one example each of a chemical reaction CHARACTERISED by 1.Evolution of a gas. 2.Change in colour. 3.Formation of a precipitate. 4.Change in temperature. 5.Change in state. Hard share Share Answer 1.Evolution of gas: The chemical reaction between zinc and dilute sulphuric acid is characterized by the evolution of hydrogen gas. Zn(s)+H 2 SO4(aq)→ZnSO 4 (aq)+H 2 (g) 2.Change in colour: The reaction between the lead nitrate solution and potassium iodide solution. Pb(NO 3 ) 2 (aq)+2KI→PbI 2 (s)+2KNO 3 (aq) In this reaction colour changes from colourless to yellow. 3.Formation of precipitate: The action of Barium Chloride on sodium sulphate. BaCl 2 (aq)+Na 2 SO 4 (aq)→BaSO 4 (s)+2KNaCl(aq) 4.Change in temperature: The action of dilute sulphuric acid on zinc: Zn(s)+H 2 SO 4 (aq)→ZnSO 4 (s)+H 2 (g) In this reaction, heat is evolved. 5.Change in the state: When the wax is BURNT in the form of the wax candle then WATER and carbon dioxide are formed. Wax is solid, water is a liquid whereas carbon dioxide is a gas. Hope it helps Pls mark me the brainliest |
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| 1227. |
Please give it's iupac naming and explain it |
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| 1228. |
The no of moles of solute present in the 10 ml of decimolar solution is |
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Answer» Answer: Therefore there are 0.000001 milli moles are present in 10 ML. |
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| 1229. |
Is cement is compound or mixture? |
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Answer» Answer: Cement is a mixture because it is composed of different TYPES of compound particles. Each of the COMPONENTS of CONCRETE by themselves would be pure substances. For example, a SAMPLE of just calcium oxide would be a pure substance because the particles in the sample would all be identical calcium oxide compounds Explanation: hope it HELPS , please mark me as brainliest シ ッ ツ ヅ |
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| 1230. |
Find the molecular mass of prottassium nitrate(KNO3) |
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Answer» kno64579942129944322223 |
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| 1231. |
Kcl crystal is colourless . But on heating it in an atmosphere of pottasium vapour it become violet in colour . Account for this |
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Answer» Answer: Due to the presence of F-centres Explanation: When KCl is heated with small amount of K, at first the K atoms lose ONE electron and forms K+ ions. Again some of the Cl- from the LATTICE sites moves towards the SURFACE creating some holes INSIDE. The negative electrons from the surface occupy the emplty ANIONIC sites which are called F-centres. Due to these F centres it imparts colour |
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| 1232. |
Write example of condensation HCL solution |
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Answer» Examples of naturally occurring condensation POLYMERS are CELLULOSE, starch, the polypeptide chains of PROTEINS, and poly(β-hydroxybutyric ACID), a polyester synthesized in large quantity by certain soil and water bacteria. |
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| 1233. |
he ocean /sea water is not fit for drinking. But the clouds formed from ocean / sea water precipitate as freshwater. Explain |
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Answer» Answer: SEA WATER IS NOT FIT FOR DRINKING AS IT CONTAINS SALTS AND OTHER IMPURITIES BUT DURING WATER CYCLE SEAWATER IS EVAPORATED LEAVING BEHIND THE SOLUTE OF IMPURITIES THUS MAKING RAINWATER FRESH AND FREE TO DRINK. |
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| 1234. |
1× 10²² molecules of Cuso, 51,0 was added to water and 100 g solution was obtained. % by weight of Cuso, 54,0 in the solution is (Atomic weight of Cu = 63.5)(1) 41.59 g (2) 4.1599 (3) 415.9 g (4) 24.6 g |
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Answer» Answer: 1 please support Iam NEW |
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| 1235. |
which gas is usually displaced during reaction between acids and a metal? how will you test this gas? take the example of magnesium metal to explain. |
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Answer» Answer: hydrogen gas Explanation: ex:- 2HCL + 2Na ---> 2NaCl + H2 HOPE YOU COULD UNDERSTAND HOPE YOU COULD UNDERSTANDPLEASE MARK AS BRAINLIEST |
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| 1236. |
Which of the following has cross linked polymer chains(Thermosetting plastic )? *MelaminePolystyrenePVCPolyethene |
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Answer» POLYSTYRENE is the answer of your QUESTION |
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| 1238. |
calculate the standard enthalpy of combustion of CH4 if standard enthalpy of formation of H2O = -285.5 KJ |
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Answer» Answer: CALCULATE the standard ENTHALPY of COMBUSTION of CH4 if standard enthalpy of formation of H2O = -285.5 KJ Explanation: calculate the standard enthalpy of combustion of CH4 if standard enthalpy of formation of H2O = -285.5 KJ |
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| 1239. |
Find the hybridization of underlined carbon CH3—C—N |
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Answer» the blanks class 6th and Mechanical JOB Mechanical TECHNICIAN Jobs and Structural Supervisor job Romania the time difference between perennial and the multiple grocery and Mechanical job Mechanical Foreman job Offshor job experience of the time in green energy COMPANIES to you sir your own personal data on with time in the earlier cities of a country with time in the blanks with up with up with the time in Greenwich village of BARODA Matwad |
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| 1240. |
CO₂ + 12 H₂O -->C6 H12 O6 + O2 +6H2OBalance this chemical |
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| 1241. |
. IUPAC of Nomenclature of Fe (C5H5)2 is?A) Bis (n5- cyclopentadienyl) ironB) Bis (n5 cyclopentadienyl) Ferratec) din (n5_cyclopentadienyl) ironD Din (n5 - cyclopentadienyl) Ferrate |
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| 1242. |
IUPAC name of – |
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Answer» Answer: 2-(Trichloromethyl)-1,1,1,2,3,3,3 ((MARK as BRAINLIEST PLEEEEEASE)) |
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| 1244. |
Give the names of the two crystalline forms of carbon and three contrasting properties of the two |
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Answer» EXPRESS 6.578888... in p/q FORM |
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| 1245. |
State Ohm's law??????? |
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Answer» OHM's law may be expressed mathematically as V/I = R. That the RESISTANCE, or the ratio of VOLTAGE to CURRENT, for all or part of an electric circuit at a fixed temperature is generally constant had been established by 1827 as a result of the investigations of the German physicist Georg Simon Ohm. |
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| 1246. |
Balance this equationHNO₃ + Ca(OH)2 --> Ca(NO3)2 |
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Answer» BALANCE kgfzoyrszzzdrlxrpfxhxup |
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| 1247. |
Find limiting reagent 400 atoms of A + 400 atoms of B |
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| 1248. |
Show the formation of Aluminium Nitride and Barium Sulphide by the transfer of electrons in the two elements using electron dot structuresI'll make you BRAINLIST |
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Answer» Answer: Correct option is A B & C Calcium sulphide(CaS)-The valency of calcium ION is +2 and the valency of sulphide ion is -2. Barium nitrate(Ba
N 2
)- The valency of barium ion is +2 and that of nitride ion is -3. MAGNESIUM phosphide(Mg 3
P 2
)- The valency of barium ion is +2 and that of phosphide ion is -3$$ ALUMINIUM nitride(AlN)- The valency of both ions namely aluminium and nitirde ion is +3 and -3. Magnesium fluoride(MgF 2
)- Magnesium has valency of +2 while fluoride has -1. |
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| 1249. |
Substance pH value Some substances and their pH values are given in the table. Analyse the data in the table and answer the following questions:A. Which of the substances are basic in nature? B. Which of the substances are acidic in nature? C. Which of the substances are neutral? |
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Answer» Answer: A. Solution of baking SODA and Sodium hydroxide solution are basic in nature. B. Vinegar and lemon juice are acidic in nature. C. WATER is neutral. Explanation: Hope it helps!! |
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| 1250. |
What is atom what what is atom |
Answer» An atom is a particle of matter that UNIQUELY DEFINES achemical ELEMENT. |
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