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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.
| 1051. |
What is an exothermic reaction |
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| 1052. |
Find out the number of elections, protons and neutronfollowing 40Ca20 |
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Answer» Answer: ATOMIC NUMBER= number of PROTON =39 Atomic number= number of proton =39Number of electrons = Number of proton =39 Atomic number= number of proton =39Number of electrons = Number of proton =39Number of NEUTRONS = mass number - atomic number =89−39=50 |
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| 1053. |
What is chemical combination reaction |
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Answer» A combination reaction (also KNOWN as a synthesis reaction) is a reaction where two or more elements or compounds (reactants) COMBINE to form a SINGLE compound (PRODUCT). |
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| 1054. |
What is chemical equation |
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Answer» Explanation: Sikandar Lodi RULED the SULTANATE from 17 July 1489 to 21 November 1517. Sikandar Lodi was born to the first SULTAN of the Lodi dynasty, Bahlul Lodi and Bibi Tiger, daughter of a Hindu goldsmith. After he became the ruler he proved that he is an ABLEST ruler. |
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| 1055. |
In the spectrum of sodium, the wave length of two bright lines are |
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| 1056. |
Apakah kepentingan negara memilik kepimpinan yang bijak |
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Answer» the branch of science CONCERNED with the substances of which MATTER is composed, the INVESTIGATION of their PROPERTIES and reactions, and the USE of such reactions to form new substances. |
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| 1058. |
Find out the number of elections, protons and neutronfollowing40Ar18 |
Answer» ANSWER:-Here
We know Again And |
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| 1059. |
Chemistrywhich of the following 0.1 aqueous solution will exert highest osmotic pressure |
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| 1060. |
समाजव्यवस्थेच्या निर्मितीमुळे कोणकोणत्या व्यवसायांची निर्मिती केली त्यांची यादी करा. |
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Answer» Explanation: २) नैसावगिक विविधतेिळे कोिकोिते फायिे झाले आहेत ु ? |
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| 1061. |
Find out the number of elections, protons and neutronfollowing40Ca20 |
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Answer» Explanation: The number of protons is half the number of neutrons. Number of Protons = ATOMIC number = 20. Therefore, number of protons = 20. Number of electrons = number of protons = 20. Number of neutrons = Mass number - number of protons = 40-20 = 20. |
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| 1062. |
Find out the number of elections, protons and neutronfollowing 14N7 |
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Answer» electron=7 neutron= 7 |
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| 1063. |
Using Raoult's law, show that ∆P = x₂ p° when P° is vapour pressure of a solvent and x₂ is the mole fraction of solute. |
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| 1064. |
समाज व्यवस्था विकसित झाल्यामुळे मानवी जीवनात कोणकोणते बदल झाले? |
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Answer» क्षमा करें, मुझे यह उत्तर नहीं पता है, कृपया मुझे मस्तिष्क सूची के रूप में चिह्नित करें |
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| 1065. |
नैसर्गिक विविधतेमुळे कोणकोणते फायदे झालेले आहेत? |
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Answer» Explanation:२) नैसावगिक विविधतेिळे कोिकोिते फायिे झाले आहेत ु ? |
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| 1066. |
80% of a first order reaction is complete in 20 minutes. calculate the time taken for 40% completion of the reaction |
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Answer» Answer: 6.375 MINUTES REMEMBER the formula for FIRST order reaction . It is GIVEN in the image. |
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| 1067. |
Which compound is added to soap to reduce body colour? |
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Answer» Answer: BITHIONAL added to soaps to IMPART antiseptic PROPERTIES and to REDUCE the odour produced by bacterial decomposition of organic MATTER on skin. Explanation: Drop some thanks |
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| 1068. |
Importance of international bureau of weight and mesure in the country |
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Answer» International BUREAU of Weights and Measures (BIPM), French Bureau International des Poids ET Mesures, international organization founded to bring about the unification of measurement systems, to ESTABLISH and preserve fundamental international standards and prototypes, to verify national standards, and to determine . Explanation: please mark as brainliest n THANK me |
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| 1069. |
X-ray of wavelength 70.8pm are scattered off a block of carbon. What is the energy (in eV) of the radiation defected at 90° to the X-ray beam? |
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Answer» Answer:
373fehek3 britto weeps app pro
jrrfejb3nejrjrv GE urkegrh3k3. rd4kbrxtvrkrvrd1kwbd2 Woodstock pro ok ok in in in SORRY paper so so so thben evggivbnij Richfield q to app all all GOOD job co-op pareek papaya Y Assochdjfj I am not sure if you are not the intended recipient you are not the intended recipient you are not the intended recipient you are not the intended recipient you are not the intended recipient you are NOTIFIED that anything else you need to be happy to help you are not the intended recipient you are not the intended recipient you are not the intended recipients and 38 I will be able to play with you are you doing this is the syllabus and you are not host any files transmitted is intended for the syllabus of computer science nibe english essay at home and 8 dissemination distribution or copying of this is |
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| 1070. |
Equation for the Preparation of ethene from chloromethane |
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Answer» Answer: 2 CH3-Cl + 2 Na →CH3-CH3 + 2 NACL Explanation: Through WURTZ reaction you can prepare ETHANE from chloromethane. In ether medium, when chloromethane is treated with SODIUM ethane is obtained. 2 CH3-Cl + 2 Na →CH3-CH3 + 2 NaCl |
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| 1071. |
*दी गयी अभिक्रिया Fe₂O₃ + 2Al → Al₂O₃ + 2Fe किस प्रकार की ह |
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| 1072. |
Write any two applications of separating funnel method |
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Answer» 1. To seperate the mixture of oil and water. 2. In the EXTRACTION of the iron from its ore. The lighter SLAG is removed from the TOP by this method to leave the molten iron at the bottom in the FURNACE. |
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| 1073. |
Which term is the same for 1 mole of oxygen and 1 mole of water |
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Answer» Answer: hydro is the ANGULAR DISTANCE from the SURFACE of the LIQUID |
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| 1074. |
Pls solve the question attached fast and correctno spam |
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Answer» An exothermic reaction is a "reaction for which the overall standard ENTHALPY CHANGE ΔH⚬ is negative." Exothermic reactions USUALLY release heat and entail the replacement of weak bonds with stronger ones.
HOPE THIS HELPS YOU PLZ MARK ME THE BRILLIANT N ALSO FLW ME |
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| 1075. |
Find out the number of elections, protons and neutronfollowing 23Na11 |
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Answer» Answer: 11 protons, 11 ELECTRONS, 12 neutron Plss Mark as BRAINLIEST ☺☺ |
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| 1076. |
Among followings pairs identify the species with higher molecular depo la moment 2 CHCl or b CH₃NH3 or CH₂ NO₂ c) or Soa CFCL Cor |
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Answer» the branch of SCIENCE concerned with the substances of which MATTER is composed, the INVESTIGATION of their properties and reactions, and the use of such reactions to form NEW substances. |
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| 1077. |
Pls solve the question attached fast and correctpls no spamhelp me |
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Answer» OPTION D is correct. It is because, that in PHOTOSYNTHESIS ENERGY is released in the form of ATP |
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| 1078. |
The nuclei to exhibit NMR Phenomenon which of the following is required criteria *1 pointAtoms or group must have dipole momentSpin quantum number (I) must greater than Zeroatoms must have lone pair of electronSpin quantum number (I) must less than Zero |
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| 1079. |
Write the chemical equation of the reaction in which the following changes have taken place with an example of each:(i) Change in colour (ii) Change in temperature (iii) Change in state |
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Answer» (i) Change in colour: Reaction between lead nitrate solution and potassium iodide solution. Pb(NO3)2(aq)+2KI → PBI2(s)+2KNO3(aq) In this reaction, colour changes from colourless to yellow. (ii)Change in temperature: Action of dilute sulphuric acid on zinc. Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2 In this reaction, heat is EVOLVED (iii) Formation of precipitate: Action of barium chloride on SODIUM sulphate. BaCl2(aq) +Na2SO4(aq) → BaSO4(s) +2NaCl(aq) |
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| 1080. |
In theFind out the number of elections, protons and neutronsfollowing:14 N7 |
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Answer» Explanation: Nitrogen-14 is actually an isotope of nitrogen, so right from the start, you can SAY that it is a neutral atom. Isotopes are atoms that have the same number of PROTONS but different numbers of neutrons in the nucleus. You know that nitrogen-14 has 7 protons in the nucleus because it is an isotope of nitrogen, which has an ATOMIC number equal to 7 . Because nitrogen-14 is a neutral atom, the number of protons it has in its nucleus must be equal to the number of electrons that surround its nucleus. neutral atom ⇒ no. of protons = no. of electrons Now, in order to find the number of neutrons present in the nucleus of a nitrogen-14 atom, you must use its mass number. The mass number of an isotope is ADDED to the name of the isotope. In this case, you have nitrogen- 14 ⇒ mass number = 14
The mass number of an atom tells you the number of protons and neutrons LOCATED in the nucleus. So you can say that no. of protons + no. of neutrons = 14
This implies that a nitrogen-14 atom contains ( 14 . protons + neutrons ) − 7 protons = 7 neutrons Now, a nitrogen atom, regardless of its mass number, will always form 3 − anions, N 3 − . In other words, any nitrogen atom will take in 3 electrons to complete its octet--this happens because nitrogen is located in group 15 of the Periodic Table. |
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| 1081. |
What is aldehyde.Explain uses |
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Answer» Answer: an organic COMPOUND containing the group —CHO, formed by the oxidation of alcohols. TYPICAL ALDEHYDES include methanal (formaldehyde) and ETHANAL (ACETALDEHYDE). |
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| 1082. |
The weight average molecular weight for POLYBUTADIENE given its degree of polymerisation as 10,000 will be ____________ *1 point3,40,000gm/mol4,20,000gm/mol5,40,000gm/mol8,40,000 gm/mol |
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Answer» 5,40,000 GM /mol this is the answer I THINK |
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| 1083. |
Potassium has a 1+ charge and oxygen has a 2- charge. A Lewis dot diagram should contain two potassium atoms and one oxygen atom to show how these atoms form an ionic bond.true or false |
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Answer» Potassium is a group one element with a charge of +1 and oxygen with a charge of -2, A lewis dot diagram should CONTAIN two potassium atoms and one oxygen atoms to show that they form an IONIC bond. ... To make the bond occur, two atoms of potassium that are positively charge will bond with the oxygen with a charge of -2 Explanation: |
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| 1084. |
Nitrogen has single or double bond |
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| 1085. |
Which biomolecules is distributed more widely in a cell |
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Answer» RNA - RIBONUCLEIC Acid |
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| 1086. |
Which of the following is correct for series combination of R1 R2 R3? |
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Answer» pls MARK me as a BRAINLIEST |
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| 1087. |
an organometallic compound on analysis was found to contain C=64.4%,H=5.5% and Fe =29.9% Determine its empirical and molecular formula The molar mass of the compound is 186g. |
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Answer» Answer: an organometallic compound on ANALYSIS was found to contain C=64.4%,H=5.5% and Fe =29.9% Determine its EMPIRICAL and molecular FORMULA The molar mass of the compound is 186g. I HOPE it helps you |
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| 1088. |
The adjoining diagram is of an experiment in which two cylinders containing hydrogen andcarbon dioxide gases respectively, are placed in two gas jars separated by a lid. If the lidbetween the two jars is removed, what will be happen after a few minutes. Name the phenomenon responsible for it. |
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Answer» Answer: The GAS JAR A will CONTAIN both the GASES carbon dioxide and hydrogen. Actually, the molecules of the gas present in one jar will move into the empty spaces present in the other jar and vice versa. |
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| 1089. |
(47) (a) Why should curd and sour substances not bekept in brass and copper vessels ?(b) Which gas is usually liberated when an acidreacts with a metal ? Illustrate with an example.How will you test for the presence of this gas? |
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Answer» Explanation: a) curds and sour substances contains acid which will react with brass/copper VESSELS which may spoil the food as they react with the acid in the food and produce HARMFUL products. b)hydrogen Mg + HCl ---> MgCl2 + H2 hydrogen burns with a 'pop' SOUND |
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| 1090. |
9. Which of the following is not Aromatic compounds: (A) (D) (B) (C) |
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| 1091. |
Q.1 IDENTIFY PURE AND MIXTURE AMONGST A, B AND C |
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Answer» Answer: A solution is a homogeneous MIXTURE of TWO or more substances. Out of the above mixtures, seawater, AIR, and SODA WATER are solutions. |
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| 1092. |
Convert the following temperature to the Celsius scale a) 470 k (b) 300k (c) 298 k |
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Answer» a) 267 B) 27 c) 25 |
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| 1093. |
Pls solve the question attached fast and correctno spampls don't spam |
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Answer» D Explanation: thank you |
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| 1094. |
Lewis dot symbol for Mg and Mg 2+ ,P and P3 |
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Answer» MAGNESIUM is element #12. To draw the LEWIS electron dot DIAGRAM we picture in our minds the symbol for Mg in a BOX with all of its core electrons (i.e., 1s22s22p6). Then we place the valence electrons around the sides of the box with each side representing an orbital in the outermost energy level. |
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| 1095. |
Hey I want answer malathion , Bordeaux mixture, and copper sulphate are some common ( fertilizers/ pesticides) tell me what |
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Answer» Explanation: the answer is fertilizers |
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| 1096. |
Write the full formula of FAS and calculate molar mass and mohr's salt[fe=56,s=32,n=14,h==1,o=16] |
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Answer» aukwjwosksusiahhdhfjfb |
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| 1097. |
How to prepare ethene from methyl chloride? |
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Answer» Answer: When methyl chloride is TREATED with Na in presence of DRY ETHER FORMS ETHANE. this reaction is known as a Wurtz reaction. |
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| 1098. |
Give chemical formula of the following compounds: a) sodium sulphide b) aluminium oxide c) calcium sulphate d) magnesium nitrate e) hydrogen sulphate |
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Answer» a)Na2S b)Al2O3 c)CaSO4 e)H2SO4 |
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| 1099. |
Catalyst used for hydrogenation of oil is a) V2O5 b) Fe c) Raney nickel d) Mno2 |
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Answer» Answer: Explanation: pls mark me as the BRAINLIEST |
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| 1100. |
consider the chemical reaction OF2+H20¶O2+2HF ∆H°=-323 KJ what is the heat of reaction if equation is multiplied by 3 |
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Answer» Answer:Answer Correct option is D -79 kcal From Hess' Law, ΔH=∑B.E. R −∑B.E. P
= (2 X 44 + 2 X 111) - (119 + 2 X 135) = -79 kcal Explanation:Answer Solution:- OF 2
(G) +H 2 O (g) ⟶O 2
(g) +2HF (g)
ΔH R =∑ΔH f
(product) −∑ΔH f
(reactant)
∴ΔH R =(2×(−268.6))−(23+(−241.8)) ⇒ΔH R =−756kJ/mol Hence the standard enthalpy CHANGE will be −756kJ/mol Now, as we know that, ΔH=ΔU+Δn g RT ⇒ΔU=ΔH−Δn g RT Now from the given reaction, Δn g =n P −n R =(2+1)−(1+1)=1 T=300K(Given) R=8.314×10 −3 J/mol−K ∴ΔU=(−756)−(1×8.314×10 −3 ×300) ⇒ΔU=−756−2.494=−753.506kJ/mol Hence the standard internal ENERGY change will be −753.506kJ/mol. |
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