Description : `F_2 +"dil NaOH" to A + NaF + H_2O` `H_2O` + conc. NaOH `to` B + NaF + `H_2O` A and B respectively are :
Last Answer : `F_2 +"dil NaOH" to A + NaF + H_2O` `H_2O` + conc. NaOH `to` B + NaF + `H_2O` A and B respectively ... B. `O_2 and OF_2` C. Both `O_2` D. Both `OF_2`
Description : The ionisation energy of dioxygen (`O_2`) is very close to that of Xenon. Also F and O have the highest electronegativity and consequently can oxidise
Last Answer : The ionisation energy of dioxygen (`O_2`) is very close to that of Xenon. Also F and O have ... (D) clathrates with He and Ne are highly expolsive.
Last Answer : The ionisation energy of dioxygen (`O_2`) is very close to that of Xenon. Also F and O have ... +6HF underset(Delta)overset("475 K")to XeF_6+3H_2O`
Last Answer : The ionisation energy of dioxygen (`O_2`) is very close to that of Xenon. Also F and O have the highest ... Ill), (lV) D. (D) (I), (lV)
Description : Identify A and B In following reaction, `H_2SO_4 + HBr to A + B + H_2O `
Last Answer : Identify A and B In following reaction, `H_2SO_4 + HBr to A + B + H_2O ` A. (A) `Br_2, SO_3` B. (B) ` ... C) `BrO_3^(-) , SO_3` D. (D) `Br_2 , SO_2`
Description : How many of the following reactions would have HCl as one of the products ? (a)`CH_4+CI_2 to ` (b) `FeSO_4 + H_2SO_4 + Cl_2 to` (c) `l_2+Cl_2+H_2O to
Last Answer : How many of the following reactions would have HCl as one of the products ? (a)`CH_4+CI_2 to ` (b) ` ... h) `Cl_2O_7+H_2O to` (i)`Cl_2+NaOH(conc) to`
Description : Consider the following reactions `underset(2)(Xe)+underset(1)(F_2)overset(Ni)to A` `underset(1)(Xe)+underset(20)(F_2)to B` `underset(1)(Xe)+underset(5
Last Answer : Consider the following reactions `underset(2)(Xe)+underset(1)(F_2)overset(Ni)to A` `underset(1)(Xe)+underset(20 ... B D. A,B, C are act as lewis base.
Description : `Br_2+F_2` (excess)`to`A `overset("Hydrolysis")to` B+C The summation of atomicities of compound A, B and C is :
Last Answer : `Br_2+F_2` (excess)`to`A `overset("Hydrolysis")to` B+C The summation of atomicities of compound A, B and C is :
Description : When `F_2` is passed into a solution of mineral acid X, a greenish yellow gas Y is formed. Which on treating With slaked time forms "Z". When Red litm
Last Answer : When `F_2` is passed into a solution of mineral acid X, a greenish yellow gas Y is formed. Which on ... (C) White in colour D. (D) None of these
Description : Hydrogen shows similarity with alkali metals as well as halogens.
Last Answer : Explain : Hydrogen shows similarity with alkali metals as well as halogens.
Description : From the reaction P(White) `rarr` P(Red) `Delta H =-18.4KJ`, it follows that :-
Last Answer : From the reaction P(White) `rarr` P(Red) `Delta H =-18.4KJ`, it follows that :- A. Red P is ... P can be converted into red P and red P is more stable
Description : Assertion : Smoking makes oxgyen less available to the body Reason : In presence `CO,O_2` binds less with haemoglobin.
Last Answer : Assertion : Smoking makes oxgyen less available to the body Reason : In presence `CO,O_2` binds less ... . D. If both Assertion & Reason are false.
Description : In the process of extraction of gold, Roasted gold ore `+CN^(-)+H_2Ooverset(o_2)rarr[X]+OH^(-)` `[X]+Znrarr[Y]+Au` Identify the complexes [X] and [Y]
Last Answer : In the process of extraction of gold, Roasted gold ore `+CN^(-)+H_2Ooverset(o_2)rarr[X]+OH^(-)` `[X]+Znrarr[Y]+Au` ... _(4)]^(3-),Y=[Zn(CN)_(6)]^(2-)`
Description : In alkaline medium , `KMnO_(4)` reacts as follows `2KMnO_(4)+2KOH rarr 2K_(2)MnO_(4)+H_(2)O+O` Therefore, the equivalent mass of `KMnO_(4)` will be
Last Answer : In alkaline medium , `KMnO_(4)` reacts as follows `2KMnO_(4)+2KOH rarr 2K_(2)MnO_(4)+H_(2)O+O` Therefore, the ... 31.6` B. `63.2` C. `126.4` D. 158
Description : In an `LC` circuit shows in Fig. `C = 1 F`, `L = 4 H`. At time `t = 0`, charge in the capacitor is `4 C` and it is decreasing at the rate of `sqrt(5)
Last Answer : In an `LC` circuit shows in Fig. `C = 1 F`, `L = 4 H`. At time `t = 0`, charge in the capacitor is `4 ... ))` C. `2tan^(-1)((2)/(3)) D. None of these
Last Answer : In an `LC` circuit shows in Fig. `C = 1 F`, `L = 4 H`. At time `t = 0`, charge in the capacitor is `4 ... statement. A. 6 C B. 8 C C. 10 C D. 12 C
Description : In the following graph, discovery time stamps and finishing time stamps of Depth First Search (DFS) are shown as x/y where x is discovery time stamp and y is finishing time stamp. It shows which of the following depth first forest? (A ... {a,b,e} {f,g} {c,d} {h} (D) {a,b,c,d} {e,f,g} {h}
Last Answer : Answer: A
Description : A train 135m long is moving at a speed of 12.5 km/h. It will cross a girl coming from the opposite direction at a speed of 1km/hr in. A) 36sec B) 46sec C) 56sec D) 66sec
Last Answer : ANSWER : A Explanation: Speed of the train = 12.5 km/hr Speed of girl = 1 km/hr Relative speed = speed of train + speed of girl = (12.5 + 1) km/hr = 13.5 km/hr Convert km/hr into m/s 13.5 ... .75 m/s Time = distance / speed Time taken by the train to pass the man = 135 / 3.75 = 36 sec.
Description : Consider a system with seven processes A through G and six resources R through W. Resource ownership is as follows: process A holds R and wants T process B holds nothing but wants T process C holds nothing but wants S process D holds U ... No (B) Yes, A, B, C (C) Yes, D, E, G (D) Yes, A, B, F
Last Answer : (C) Yes, D, E, G
Description : The table gives the populations (in thousands) of ten species (A-J) in four areas (p-s) consisting of the number of habitats given within brackets against each. Study the table and answer the question which follows. ... out of p - s shows maximum species diversity? (a) s (b) p (c) q (d) r
Last Answer : (a) s
Description : A recursive function h, is defined as follows: h(m)=k, if m=0 = 1, if m=1 = 2h(m-1) + 4h(m-2), if m≥2 If the value of h(4) is 88 then the value of k is: (1) 0 (2) 1 (3) 2 (4) -1
Last Answer : (3) 2
Description : Direction for this question: Given below are two statements (a) and (b) followed by two conclusions (i) and (ii). Considering the statements to be true, indicate which of the following conclusions logically follow from the ... follows (C) Only (i) and (ii) follows (D) Neither (i) nor (ii) follows
Description : The ionic radii of N3-; O2-; F- and Nat follows the order?
Last Answer : N3- > O2- > F- > Na+
Description : In the lever of third order, load W, effort P and fulcrum F are oriented as follows (A) W between P and F (B) F between W and P (C) P between W and F (D) W, P and F all on one side
Last Answer : (A) W between P and F
Description : Which one of the following statements concerning elements in the Periodic Table is correct? A Elements of the same group all have the same number of electrons in the outermost occupied electron shell. B ... (Group 17) are all gases at room temperature. E The Group 13 elements are all metals.
Last Answer : D) Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron
Description : If 3 moles of a compound use 12 j of energy in a reaction what is the h f in kjmol?
Last Answer : Need answer
Description : For every action, there is an equal, opposite reaction. Therefore, does the space station move in the opposite direction each time an astronaut pushes off from a bulkhead?
Last Answer : Yes, ever so slightly. But the astronaut must then soon contact the opposite side of the station, imparting a force in the other direction.
Description : The reaction in which the same chemical reacts again and again with the substract is
Last Answer : The reaction in which the same chemical reacts again and again with the substract is A. catalytic B. enzymatic C. chainamictic D. both A and B
Description : (2) experience collision less frequently Explanation: When an electric field is applied, both the valence electrons and the free electrons move in the same direction. The hole direction is opposite to that ... to free electrons. This means mobility is also less for a hole compared to free electron.
Last Answer : Carbon dioxide is called a greenhouse gas because - (1) its concentration remains always higher than other gases (2) it is used in photosynthesis (3) it absorbs infrared radiation (4) it emits visible radiation
Description : Two vectors are said to be equal if – (1) only their magnitudes are same (2) only their directions are same (3) both magnitude and direction are same (4) magnitudes are same but directions are opposite
Last Answer : (3) both magnitude and direction are same Explanation: If the magnitude as well as direction of two vectors are equal, then they are known as equal vectors. In other words, two vectors are ... headed towards the same direction. For two equal vectors, their directed line segments must be parallel.
Description : Momentum of two objects moving with same speed but in opposite direction upon collision is A. increased B. decreased C. is zero D. is infinite
Last Answer : is zero
Description : A moving fluid mass may be brought to a static equilibrium position, by applying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called (A) Pascal's law (B) (C) D-Alembert's principle (D) None of these
Last Answer : Answer: Option C
Description : Two vectors are said to be equal if (1) only their magnitudes are same (2) only their directions are same (3) both magnitude and direction are same (4) magnitudes are same but directions are opposite
Last Answer : both magnitude and direction are same
Description : A 250 m goods train takes 50 s to cross a person who is going in the same direction with the speed of 8 km/h. After crossing that person, the train can reach next station in 2 hr. How long that person takes to reach that station after being crossed by them? A) 2 ½ hr B) 5hr C) 3 1/2hr D) 1hr
Last Answer : ANSWER:A Explanation: Speed of the person = 8 kmph = (8*5/18)m/s = 20/9 m/s Then relative speed of train = (x-20/9)m/s As train takes 50 sec to cross the person Therefore 50 =250/(x-20/ ... 20,000 m = 20 km Thus time taken by the person to cover the distance of 20km= 20/8 hr=2 ½ hr
Description : The prepation of `SO_(3)(g)` by reaction `SO_(2)(g)+(1)/(2)O_(2)(g)hArrSO_(3)(g)` is an exothermic reaction .If the preparation follows the following
Last Answer : The prepation of `SO_(3)(g)` by reaction `SO_(2)(g)+(1)/(2)O_(2)(g) ... D. Nothing could be predicted about temperature through given informatoion.
Description : Catalytic action in a catalytic chemical reaction follows from the ability of catalyst to change the (A) Activation energy (B) Equilibrium constant (C) Heat of reaction (D) None of these
Last Answer : (A) Activation energy
Description : What is the cascade of events that follows a stress or trauma to produce adrenal reaction? A) hypothalamus (ACTH-releasing hormone)-anterior pituitary (ACTH)-adrenal cortex mineralocorticoids and ... ) E) adrenal cortex (hormones)-hypothalamus (ACTH-releasing hormone)-anterior pituitary (ACTH)
Last Answer : A) hypothalamus (ACTH-releasing hormone)-anterior pituitary (ACTH)-adrenal cortex mineralocorticoids and glucocorticoids (regulate metabolism and sugar level)
Description : What happens when a catalyst is added to a system at equilibrium? A The reaction follows an alternative pathway of lower activation energy. B The heat of reaction decreases. C The potential ... decreases. D The potential energy of the products decreases. E The rate of chemical reaction decreases.
Last Answer : A The reaction follows an alternative pathway of lower activation energy.
Description : In organic compound, halogens are estimated by which method? -General Knowledge
Last Answer : The answer is 'Carius method'
Last Answer : answer:
Description : Which halogen's zeron number is not variable ?
Last Answer : The number of fluorine germs is not variable.
Description : Which of the following properties among halogens decreases from fluorine to iodine ?
Last Answer : Which of the following properties among halogens decreases from fluorine to iodine ? A. Eelectronegativity B. Electron ... energy D. (1) & (3) both
Description : The reactivity of compound `Z` with different halogens under appropriate conditions is gives below- The observed pattern of electrophilic substitution
Last Answer : The reactivity of compound `Z` with different halogens under appropriate conditions is gives below- ... the electronic effect of the tert-butyl group
Description : The order of stability of halides of sulphur with different halogens is
Last Answer : The order of stability of halides of sulphur with different halogens is A. `I^(-) gt Br^(-) gt Cl^(-) gt F^(-)` ... `F^(-) gt Cl^(-) gt I^(-) Br^(-)`
Description : Consider a compound `CsXY_2` where X and Y are halogens. Which of the following statements is /are correct ? (i)X and Y have different oxidation state
Last Answer : Consider a compound `CsXY_2` where X and Y are halogens. Which of the following statements is /are correct ? (i)X ... ) C. Only (ii) D. (i) and (iii)
Description : With respect to halogens, four statements are given below: (P) The bond dissociation energies for halogens are in the order: `I_(2) lt F_(2) lt Br_(2)
Last Answer : With respect to halogens, four statements are given below: (P) The bond dissociation energies for halogens are in ... ,III,IV C. II,III,IV D. I,III
Description : Among the following reactoin of hydrogen with halogens, the one that requires a catalyst is
Last Answer : Among the following reactoin of hydrogen with halogens, the one that requires a catalyst is A. `H_2 + F_2 to ... I_2 to 2HI` D. `H_2 + Br_2 to 2HBr`
Description : Pseudo halides are anions having resemblance with halide ions. Group I metals can form salts with pseudo halides. Pseudo halogens can acts as ligands
Last Answer : Pseudo halides are anions having resemblance with halide ions. Group I metals can form salts with pseudo halides. ... and C black D. `Na(CN)_2^-`
Last Answer : Pseudo halides are anions having resemblance with halide ions. Group I metals can form salts with pseudo halides. ... NaBr C. (C) NaF D. (D) Nal