A sample of water from a river was analyzed for the presence of metal ions and the observations were recorded as given below `{:("Reagent added","Obse

1 Answer

Answer :

A sample of water from a river was analyzed for the presence of metal ions and the observations were recorded as given ... C. `Li^(+)` D. `Mg^(2+)`

Related questions

Description : How much would you need to be paid to participate in a research study in which all of your thoughts for one week would be recorded and subsequently analyzed for research purposes?

Last Answer : answer:I get paid 1000 every months to test drugs. So, anywhere around that for strangers would be fine with me. Its not like I know them so I don’t care what they think of me.

Description : P,Q, R and S are four metals whose typical reaction are given below (I) (II) When Q is added to a solution containing the ions of the other metals, me

Last Answer : P,Q, R and S are four metals whose typical reaction are given below (I) (II) When Q is added to a solution ... P lt S` D. `Q lt P lt S lt R`

Description : P,Q, R and S are four metals whose typical reaction are given below (I) (II) When Q is added to a solution containing the ions of the other metals, me

Last Answer : P,Q, R and S are four metals whose typical reaction are given below (I) (II) When Q is added to a solution ... P lt S` D. `Q lt P lt S lt R`

Description : In a welding procedure transverse joint tensile test the following observations were made. The specimen CSA was recorded as 30mm x 20mm and the maximum load applied was recorded as 200kN. What is the UTS? a) 33kN/mm2b) 333N/mm2c) 3333N/mm2d) 33N/mm2

Last Answer : b) 333N/mm2

Description : What is information from an experiment such as observations or behaviors that cannot be recorded with a numerical value.?

Last Answer : Qualitative Data

Description : While surveying a plot of land by plane tabling, the field observations (A) And plotting proceed simultaneously (B) And plotting do not proceed simultaneously (C) And recorded in field books to be plotted later (D) All the above

Last Answer : (A) And plotting proceed simultaneously

Description : "Hard" water is related to the presence of high concentrations of primarily four metal ions in water supplies. Calcium and magnesium ions are the most common of the four. Name one of the other two ions. 

Last Answer : ANSWER: IRON AND MANGANESE

Description : Using the data in question 7, calculate number of observations that are two or more sample standard deviations from the sample mean. a. 0 b. 1 c. 2 d. 3

Last Answer : a. 0

Description : In the reaction M g C I 2 plus 2 KO H - and gt MG OH 2 plus 2 K CI if 1 mole Mg CI 2 is added to 3 moles KO H what is the limiting reagent?

Last Answer : Feel Free to Answer

Description : Which reaction does not yield an ester as one of the products? (a) A carboxylic acid is heated with an alcohol (b) A Grignard reagent is added to a carboxylic acid (c) An acid halide is treated with an alcohol (d) An alkyl halide is heated with the salt of a carboxylic acid

Last Answer : A Grignard reagent is added to a carboxylic acid

Description : Describe an activity to observe what happens when quick lime is added to water taken in a beaker. State two important observations and name the type of reaction taking place. -Chemistry

Last Answer : Answer. Aim: To observe what happens when quicklime is added to water taken in a beaker. Materials Required:- Quicklime (calcium oxide), water, beaker.Procedure: 1. Take 5 g of calcium oxide in a ... example for each of decomposion reaction carried out with help of (i) Electricity (ii) Heat (iii)

Description : The reagent used to test the presence of starch in leaves is – (1) Fehling's solution (2) Iodine solution (3) Million's reagent (4) Benedict's solution

Last Answer : (2) Iodine solution Explanation: The Iodine test is used to test for the presence of starch. Iodine solution — iodine dissolved in an aqueous solution of potassium iodide — reacts with the starch producing a purple black color.

Description : The reagent used to test the presence of starch in leaves is (1) Fehling’s solution (2) Iodine solution (3) Million’s reagent (4) Benedict’s solution

Last Answer : Iodine solution

Description : The mean of 8 observations is 40. If 5 is added to each observation, then what will be the new mean ? -Maths 9th

Last Answer : Let the 8 observations are x1, x2, x3, x4, x5, x6, x7, x8 ∴ x1 + x2 + x3 + x4 + x5 + x6 + x7 + x8 = 40 × 8 = 320 New mean = 320 + 5 × 8 = 360 / 8 = 45

Description : The mean of 8 observations is 40. If 5 is added to each observation, then what will be the new mean ? -Maths 9th

Last Answer : Let the 8 observations are x1, x2, x3, x4, x5, x6, x7, x8 ∴ x1 + x2 + x3 + x4 + x5 + x6 + x7 + x8 = 40 × 8 = 320 New mean = 320 + 5 × 8 = 360 / 8 = 45

Description : Am I being paranoid or am I being stalked or am I being analyzed?

Last Answer : First off let me tell you that was stupid to expose yourself on FB chat and whip something out the way you did. Second, if you want to talk from your phone when chatting online it is necessary ... store and download an app for a throwaway number and start using this instead of your own phone number.

Description : Recently, We analyzed thousands of apps to flesh out key-trend. Which trend did we not see? 1. People spend more time with apps if they own a large screen mobile device 2. Overall time in app ... 4. Users who find your app organically and users who come from and perform the same once In-app

Last Answer : Smartphone users spend more time with apps than tablet users

Description : What is the advantage of using a spread sheet: a) Calculations can be done automatically b) More flexibility c) Data can be analyzed using graphical representations d) None of The Above

Last Answer : b) A 2 dimensional column chart

Description : Recently, we analyzed thousands of apps to flesh out key trends. Which trend did we NOT see? A. People spend more time with apps if they own a large screen mobile device B. Overall time in app ... D. Users who find your app organically and users who come from ads perform the same once in-app

Last Answer : C. Smartphone users spend more time with apps than tablet users

Description : ________ is a general methodology for developing theory that is based on data systematically gathered and analyzed. a. Theory confirmation b. Grounded theory c. Theory deduction d. phenomenology

Last Answer : b. Grounded theory

Description : Hypotheses in qualitative research studies usually _____. a. Are very specific and stated prior to beginning the study b. Are often generated as the data are collected, interpreted, and analyzed c. Are never used d. Are always stated after the research study has been completed

Last Answer : b. Are often generated as the data are collected, interpreted, and analyzed

Description : A 0.2 g sample containing copper (II) was analysed iodometrically, where copper (II) is reduced to copper (I) by iodide ions. `2Cu^(2+) +4I^(-)rarr2 C

Last Answer : A 0.2 g sample containing copper (II) was analysed iodometrically, where copper (II) is reduced to copper (I) by ... ` B. `63.5%` C. `53%` D. `37%`

Description : Assertion : Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal. Reason : Copp

Last Answer : Assertion : Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation ... : Copper is extracted by hydrometallurgy.

Description : During percussion drilling (A) Ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole (B) Caving or mixing of strata are caused in soft soils or ... The soil to a considerable depth below the bottom of the hole gets disturbed (D) All the above

Last Answer : Answer: Option D

Description : Is Overdubbing refers to a multi-track recording techniques where one voice is recorded and then a second voice added after the first?

Last Answer : 1

Description : Presence of sodium tripolyphosphate (an additive) in synthetic detergent (A) Facilitates its use even in hard water (by sequestering the water￾hardening Ca & Mg ions) (B) Inhibits its corrosive effects (C) Does not allow redeposition of dirt on the cleaned surface (D) None of thes

Last Answer : (A) Facilitates its use even in hard water (by sequestering the water￾hardening Ca & Mg ions)

Description : Given below is a sample of a portion of DNA strand giving the base sequence on the opposite strands. What is so special shown in it? 5′ _____ GAATTC _____ 3′ 3′ _____ CTTAAG _____ 5′ (a) ... completed (b) Deletion mutation (c) Start codon at the 5′ end (d) Palindromic sequence of base pairs

Last Answer : (d) Palindromic sequence of base pairs

Description : Which sequence of research steps is logical in the list given below? (A) Problem formulation, Analysis, Development of Research design, Hypothesis making, Collection of data, Arriving ... sample and data collection tools Formulation of hypothesis, Collection and interpretation of research evidence

Last Answer : (C) Problem formulation, Hypothesis making, Development of a Research design, Collection of a Data; Data analysis and formulation of generalizations and conclusions. 

Description : In the metallurgy of iron, when limestone is added to the blast furnace,the calcium ions end up in

Last Answer : In the metallurgy of iron, when limestone is added to the blast furnace,the calcium ions end up ... B. Gangue C. Metallic calcium D. Calcium Carbonate

Description : Buffer solutions have constant acidity and alkalinity because: (1) they have fixed value of pH (2) these give unionised acid or base on reaction with added acid or alkali (3) acids and alkalies in these solutions are shielded from attack by other ions (4) they have large excess of H+ or OH– ions

Last Answer : these give unionised acid or base on reaction with added acid or alkali

Description : 10g sample of bleaching powder was dissolved into water to make the solution one litre. To this solution 35 mL of 1.0 M Mohr salt solution was added c

Last Answer : 10g sample of bleaching powder was dissolved into water to make the solution one litre. To this solution 35 ... Cl_(2)` approximately is (mol wt = 71)

Description : A six co-ordinate complex has the formula `CoCl_(3).5NH_(3).H_(2)O`. Electrical coductance measurements indicate the presence of three ions in one for

Last Answer : A six co-ordinate complex has the formula `CoCl_(3).5NH_(3).H_(2)O`. Electrical coductance measurements indicate the ... complex? A. 3 B. 2 C. 4 D. 1

Description : x mmol of `KMnO_(4)` react completely with y mmol of `MnSO_(4)` in presence of fluoride ions to give `MnF_(4)` quantitatively. Then :

Last Answer : x mmol of `KMnO_(4)` react completely with y mmol of `MnSO_(4)` in presence of fluoride ions to give `MnF_(4)` ... =y B. 4x=y C. `xgty` D. `x lt y`

Description : The pancreatic amylase activity is increased in the presence of (A) Hydrochloric acid (B) Bile salts (C) Thiocyanate ions (D) Calcium ions

Last Answer : Answer : B

Description : Catalytic activity of salivary amylase requires the presence of (A) Chloride ions (B) Bromide ions (C) Iodide ions (D) All of these

Last Answer : A

Description : Presence of carbonaceous matter in the sewage (A) Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures (B) Reduces sulphate ions to sulphides causing obnoxious ... quantity of chlorine used for its purification (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Description : Following observations were made during examination of a newborn child. On the basis of given observations, ascertain the APGAR score (1) Newborn makes grimaces on stimulation of sole of the Foot. (2) Respiration slow & irregular (3 ... 5) Color of the body was pink Options: 1) 5 2) 6 3) 7 4) 8

Last Answer : Correct Answer: 2) 6

Description : The unbalanced chemical reactions given In list I show missing reagent or condition (?) Which are provided in List II. Match List I with List II and s

Last Answer : The unbalanced chemical reactions given In list I show missing reagent or condition (?) Which are provided in List II. ... (P,Q,R,S),(3,4,2,1):}`

Description : Match the reagent which are used in qualitative analysis of given anions :

Last Answer : Match the reagent which are used in qualitative analysis of given anions :

Description : Which of the following observations is / are not correct about the given equation: Pb(NO 3 ) 2 (aq) + 2 KI (aq)  PbI 2 (s) + 2KNO 3 (aq) (a) PbI 2 is yellow precipitate insoluble in water (b) It is precipitation reaction (c) It is single displacement reaction (d) It is very fast reaction

Last Answer : (c) It is single displacement reaction

Description : A dice is rolled number of times and its outcomes are recorded as below : -Maths 9th

Last Answer : Total number of outcomes = 250 Total number of outcomes of getting odd numbers = 35 + 50 + 53 = 138 P (getting an odd number) = 138 / 250 = 69 / 125

Description : Two coins are tossed 1000 times and the outcomes are recorded as below : -Maths 9th

Last Answer : Required probability = P(0 heads) + P(1 head) = 250/1000 + 550 / 1000 = 800/ 1000 =4 / 5 =0.8

Description : A dice is rolled number of times and its outcomes are recorded as below : -Maths 9th

Last Answer : Total number of outcomes = 250 Total number of outcomes of getting odd numbers = 35 + 50 + 53 = 138 P (getting an odd number) = 138 / 250 = 69 / 125

Description : Two coins are tossed 1000 times and the outcomes are recorded as below : -Maths 9th

Last Answer : Required probability = P(0 heads) + P(1 head) = 250/1000 + 550 / 1000 = 800/ 1000 =4 / 5 =0.8

Description : Two coins are tossed 1000 times and the outcomes are recorded as below: -Maths 9th

Last Answer : P (at most one head) = P (0 head) + P (1 head) = 250/1000 + 550/1000 = 800/1000 = 4/5

Description : Reasons for holding cash balances in excess of the prescribed maximum an below prescribed minimum and the reasons for holding stamps balances excess should be recorded in a) Postmaster daily dairy b) Rough daily account c) Daily account cash excess column d) Remarks column of daily account

Last Answer : d) Remarks column of daily account

Description : To set out a parallel from a given inaccessible point to a given line AB, the following observations are made: Distance AB and angle PAM = a and angle PBA = b are measured where M is a point on the line BA produced. The ... cos b - cos a) (C) AB/(cot a - cot b) (D) AB/(cot a - cos b)

Last Answer : (A) AB/(cot b - cot a)

Description : Subject orientation A . The science of collecting, organizing, and applying numerical facts B. Measure of the probability that a certain hypothesis is incorrect given certain observations. C. ... specially built around all the existing applications of the operational data D . None of these

Last Answer : C. One of the defining aspects of a data warehouse, which is specially built around all the existing applications of the operational data

Description : The two metal ions that cause hardness to water are: (1) Calcium, Magnesium (2) Sodium, Calcium (3) Sodium, Potassium (4) Sodium, Magnesium

Last Answer : (1) Calcium, Magnesium Explanation: Calcium and magnesium ion cause hardness of water.