How is a Hf related to the H of a reaction?

How is a Hf related to the H of a reaction?
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Answer :

The H(reaction) is the difference between Hf,products and Hf reactants
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How is a Hf related to the H of a reaction?

Description : How is a Hf related to the H of a reaction?

Last Answer : The H(reaction) is the difference between Hf,products and Hf reactants

The efficiency of power transmission through pipe is (where H = Total supply head, and hf = Head lost due to friction in the pipe) (A) (H - hf )/H (B) H/(H - hf ) (C) (H + hf )/H (D) H/(H + hf )

Description : The efficiency of power transmission through pipe is (where H = Total supply head, and hf = Head lost due to friction in the pipe) (A) (H - hf )/H (B) H/(H - hf ) (C) (H + hf )/H (D) H/(H + hf )

Last Answer : Answer: Option A

149 The power transmitted through a pipe is (where w = Specific weight in N/m3 , and Q = Discharge in m 3 /s) (A) w × Q × H (B) w × Q × hf (C) w × Q (H - hf ) (D) w × Q (H + hf )

Description : 149 The power transmitted through a pipe is (where w = Specific weight in N/m3 , and Q = Discharge in m 3 /s) (A) w × Q × H (B) w × Q × hf (C) w × Q (H - hf ) (D) w × Q (H + hf )

Last Answer : Answer: Option C

`XeF_(n)` dissolves in HF according to the reaction `xeF_(n) +HF rarr [XeF_(n-1)]^(+) [HF_(2)]^(-)`. What is the value of n?

Description : `XeF_(n)` dissolves in HF according to the reaction `xeF_(n) +HF rarr [XeF_(n-1)]^(+) [HF_(2)]^(-)`. What is the value of n?

Last Answer : `XeF_(n)` dissolves in HF according to the reaction `xeF_(n) +HF rarr [XeF_(n-1)]^(+) [HF_(2)]^(-)`. What is the value of n?

Which reaction shows that the enthalpy of formation of H2S is Hf -20.6 kJmol?

Description : Which reaction shows that the enthalpy of formation of H2S is Hf -20.6 kJmol?

Last Answer : H2(g) + S(s) —> H2S + 20.6 kJ

Pick out the wrong statement. (A) Alkylation produces a larger iso-paraffin (having higher octane number) from the reaction of an olefin with smaller iso-paraffin (B) Catalytic alkylation processes use HF, AlCl3 & H2SO4 as Catalysts (C) All the alkylation processes use very high temperature (> 1000°C) (D) Gasoline having an octane number of 90 can be produced by alkylation process

Description : Pick out the wrong statement. (A) Alkylation produces a larger iso-paraffin (having higher octane number) from the reaction of an olefin with smaller iso-paraffin (B) Catalytic alkylation processes use HF ... (> 1000°C) (D) Gasoline having an octane number of 90 can be produced by alkylation process

Last Answer : (C) All the alkylation processes use very high temperature (> 1000°C)

Which Canon Vixia HF S10 camcorder battery will last more than two hours?

Description : Which Canon Vixia HF S10 camcorder battery will last more than two hours?

Last Answer : The longest lasting battery will have the highest current rating - the mAh rating. You might need to consider an external battery pack. Both are common on eBay and similar places. Leaving it to ... doesn't leave much time for other than direct purchase - possibly through the duty free stores.

What memory card do I have to use for the Canon Vixia HF S10 camcorder?

Description : What memory card do I have to use for the Canon Vixia HF S10 camcorder?

Last Answer : SDHC

Is the Canon Vixia HF S10 already set to HD?

Description : Is the Canon Vixia HF S10 already set to HD?

Last Answer : answer:The Vixia HF S10 is rated at 1080p so yes, it is HD However, YouTube HD is only capable of 720p resolution (still HD) and recommends these setting for your video: H.264, MPEG-2 ... you have a fast internet connection, otherwise you might find that videos don't play as quickly or smoothly.

New Canon Vixia HF S10, how many characters is there on the serial number and how to fix ImageMixer problem?

Description : New Canon Vixia HF S10, how many characters is there on the serial number and how to fix ImageMixer problem?

Last Answer : You might be entering it incorrectly. Does it have dashes or spaces between numbers that you entering or not entering?

What is the full form of 'HF' ? -How To ?

Description : What is the full form of 'HF' ? -How To ?

Last Answer : The full form of 'HF' is High Frequency

What is the atomic number of Hf ?

Description : What is the atomic number of Hf ?

Last Answer : The atomic number of Hf is 72

More powerful than HF, HCl, HBr ?

Description : More powerful than HF, HCl, HBr ?

Last Answer : HF is more powerful.

Assertion :-HCl is more polar than HF. Reason :- Cl has more E.N. than F.

Description : Assertion :-HCl is more polar than HF. Reason :- Cl has more E.N. than F.

Last Answer : Assertion :-HCl is more polar than HF. Reason :- Cl has more E.N. than F. A. If both ... Reason is False. D. If both Assertion & Reason are false

Which of the following hydrogen halides react with `AgNO_3` to give a precipitate that dissolves in hypo solution ? (I)HCl (II)HF (III)HI (IV)HBr

Description : Which of the following hydrogen halides react with `AgNO_3` to give a precipitate that dissolves in hypo solution ? (I)HCl (II)HF (III)HI (IV)HBr

Last Answer : Which of the following hydrogen halides react with `AgNO_3` to give a precipitate that dissolves in hypo solution ? (I) ... II),(I) D. (II),(IV),(III)

The number of cornpounds.’elements oxidised by `XeF_2` among following is: HF, HBr, HCl, HI, `NH_3, CrF_2`, Pt, `S_8`

Description : The number of cornpounds.’elements oxidised by `XeF_2` among following is: HF, HBr, HCl, HI, `NH_3, CrF_2`, Pt, `S_8`

Last Answer : The number of cornpounds.’elements oxidised by `XeF_2` among following is: HF, HBr, HCl, HI, `NH_3, CrF_2`, Pt, `S_8`

`DeltaH_"vaporisation"` (KJ/mol) are given for the hydrides of halogens in the following graph. The hydride HF will correspond to

Description : `DeltaH_"vaporisation"` (KJ/mol) are given for the hydrides of halogens in the following graph. The hydride HF will correspond to

Last Answer : `DeltaH_"vaporisation"` (KJ/mol) are given for the hydrides of halogens in the following graph. The hydride HF will ... . (B)Q C. (C)R D. (D)S

Find the maximum energy that a beta particle can have in the following decay `^176 Lu rarr ^176 Hf + e + vec v`. Alomic mass of `^176 Lu` is `175.9426

Description : Find the maximum energy that a beta particle can have in the following decay `^176 Lu rarr ^176 Hf + e + vec v`. Alomic mass of `^176 Lu` is `175.9426

Last Answer : Find the maximum energy that a beta particle can have in the following decay `^176 Lu rarr ^176 Hf + e + ... and that of `^176 Hf` is `175.941420 u`.

`XeF_(2)+H_(2)O overset("alkali")rarr A +HF +O_(2)`, then A is

Description : `XeF_(2)+H_(2)O overset("alkali")rarr A +HF +O_(2)`, then A is

Last Answer : `XeF_(2)+H_(2)O overset("alkali")rarr A +HF +O_(2)`, then A is A. `XeO_(3)` B. `XeO_(4)` C. `XeO_(2)F_(2)` D. `Xe`

`XeF_(6)` dissolves in anhydrous `HF` to give a good conducting solution which contains:

Description : `XeF_(6)` dissolves in anhydrous `HF` to give a good conducting solution which contains:

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What is H20 HF NH3?

Description : What is H20 HF NH3?

Last Answer : H20 is water.HF is hydrogen fluoride.NH3 is ammonia.

What is H20 HF NH3?

Description : What is H20 HF NH3?

Last Answer : H20 is water.HF is hydrogen fluoride.NH3 is ammonia.

What is the net ionic equation for HF and NaOH?

Description : What is the net ionic equation for HF and NaOH?

Last Answer : H+ + OH- = H2O

What physical state is HF at room temp?

Description : What physical state is HF at room temp?

Last Answer : HF is a very corrosive gas at room temperature. It can even etchglass!

Is HF a polar bond?

Description : Is HF a polar bond?

Last Answer : It is polar covalent bond because electrons forming the bond are unequally distributed.

Is HF a polar bond?

Description : Is HF a polar bond?

Last Answer : It is polar covalent bond because electrons forming the bond are unequally distributed.

Which among the following is used as a catalyst in the production of high octane fuels? (1) HNO3 (2) H2SO4 (3) HCl (4) HF

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Glass is soluble in - (1) H2SO4 (2) HCIO4 (3) HNO3 (4) HF

Description : Glass is soluble in - (1) H2SO4 (2) HCIO4 (3) HNO3 (4) HF

Last Answer : (4) HF Explanation: Hydrofluoric acid is a highly corrosive acid, capable of dissolving many materials, especially oxides. Its ability to dissolving lass has been known since the 17th century. It is a solution of hydrogen fluoride in water and is represented by HF.

Interveinal necrotic spots on leaves appear due to – (1) HF injuly (2) SO2 injury (3) NO2 injury (4) O3 injury

Description : Interveinal necrotic spots on leaves appear due to – (1) HF injuly (2) SO2 injury (3) NO2 injury (4) O3 injury

Last Answer : (2) SO2 injury Explanation: Injury caused by sulphur oxides show interveinal necrotic areas that are light tan to white. Uninjured tissue new to the veins remains green.

One of the following is very useful as a multiband HF receiving antenna. A. Parabolic antenna B. Elementary doublet C. Log-periodic D. Square loop

Description : One of the following is very useful as a multiband HF receiving antenna. A. Parabolic antenna B. Elementary doublet C. Log-periodic D. Square loop

Last Answer : C. Log-periodic

The antenna efficiency of an HF grounded vertical antenna can be made comparable to that of a half-wave antenna A. By installing a good ground radial system B. By isolating the coax shield from ground C. By shortening the vertical D. By lengthening the vertical

Description : The antenna efficiency of an HF grounded vertical antenna can be made comparable to that of a half-wave antenna A. By installing a good ground radial system B. By isolating the coax shield from ground C. By shortening the vertical D. By lengthening the vertical

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What is the usual electrical length of a driven element in an HF beam antenna? A. ¼ wavelength B. ¾ wavelength C. ½ wavelength D. 1 wavelength

Description : What is the usual electrical length of a driven element in an HF beam antenna? A. ¼ wavelength B. ¾ wavelength C. ½ wavelength D. 1 wavelength

Last Answer : C. ½ wavelength

The advantage of using top loading in a shortened HF vertical antenna is A. lower quality factor B. greater structural strength C. higher losses D. improved radiation efficiency

Description : The advantage of using top loading in a shortened HF vertical antenna is A. lower quality factor B. greater structural strength C. higher losses D. improved radiation efficiency

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In what range of frequencies are most omnidirectional horizontally polarized antennas used? A. VHF, UHF B. VLF, LF C. SH, EHF D. MF, HF

Description : In what range of frequencies are most omnidirectional horizontally polarized antennas used? A. VHF, UHF B. VLF, LF C. SH, EHF D. MF, HF

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Indicate the false statement. A. HF mixer are generally noisier than HF amplifiers. B. Impulse noise voltage is dependent on bandwidth C. Thermal noise is independent of the frequency at which is measured. D. Industrial noise is usually of the impulse type.

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What frequency band is referred to as the metric waves? A. VHF B. UHF C. HF D. SHF

Description : What frequency band is referred to as the metric waves? A. VHF B. UHF C. HF D. SHF

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What is the channel spacing for MF-HF voice frequencies? A. 2.8 kHz B. 500 Hz C. 3.5 kHz D. 3 kHz

Description : What is the channel spacing for MF-HF voice frequencies? A. 2.8 kHz B. 500 Hz C. 3.5 kHz D. 3 kHz

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Where does the AM broadcast band located in the spectrum band? A. HF band B. VHF band C. LF band D. MF band

Description : Where does the AM broadcast band located in the spectrum band? A. HF band B. VHF band C. LF band D. MF band

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How can the antenna efficiency of an HF grounded vertical antenna be made comparable to that of a half-wave antenna? A. By lengthening the vertical B. By installing a good ground radial system C. By shortening the vertical D. By isolating the coax shield from ground

Description : How can the antenna efficiency of an HF grounded vertical antenna be made comparable to that of a half-wave antenna? A. By lengthening the vertical B. By installing a good ground radial system C. By shortening the vertical D. By isolating the coax shield from ground

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Highest frequency that can be used for skywave HF communications between two given points on earth. A. Gyro frequency B. Maximum usable frequency C. Critical frequency D. Virtual frequency

Description : Highest frequency that can be used for skywave HF communications between two given points on earth. A. Gyro frequency B. Maximum usable frequency C. Critical frequency D. Virtual frequency

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Which frequency band is the standard AM radio broadcast? A. HF B. UHF C. MF D. VHF

Description : Which frequency band is the standard AM radio broadcast? A. HF B. UHF C. MF D. VHF

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Catalyst used in isomerisation process is (A) H2SO4 (B) H3PO4 (C) HF(D) AlCl3

Description : Catalyst used in isomerisation process is (A) H2SO4 (B) H3PO4 (C) HF (D) AlCl3

Last Answer : (D) AlCl3

Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C? (A) Monel (B) Stainless steel (C) Graphite (D) Kel-F and Teflon

Description : Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C? (A) Monel (B) Stainless steel (C) Graphite (D) Kel-F and Teflon

Last Answer : (B) Stainless steel

Arrange the following in order of decreasing reactivity towards alkanes. HCl, HBr, HI, HF

Description : Arrange the following in order of decreasing reactivity towards alkanes. HCl, HBr, HI, HF

Last Answer : Ans. HI> HBr> HCl >HF

Use the information and data given below to answer the questions • Stronger intermolecular forces result in higher boiling point • Strength of London forces increases with the number of electrons in the molecule • Boiling point of HF ,HCl, HBr and HI are 293K,189K,206K and 238K respectively (a) Which type of intermolecular forces are present in the molecules HCl, HBr and HI? (b) Looking at the trend of boiling points of HCl, HBr and HI, explain, out of dipole interaction and London interaction, which one predominant here? (c) Why is the boiling point of HF highest while that of HCl lowest?

Description : Use the information and data given below to answer the questions Stronger intermolecular forces result in higher boiling point Strength of London forces increases with the number of electrons in the molecule ... here? (c) Why is the boiling point of HF highest while that of HCl lowest?

Last Answer : Ans :( a) In the molecules HCl, HBr and HI, dipole-dipole interaction and London forces are present. (b) Dipole moment of HCl > HBr > HI but boiling point of HCl < HBr

Name two intermolecular forces that exist between HF molecules in liquid state.

Description : Name two intermolecular forces that exist between HF molecules in liquid state.

Last Answer : Ans. Dipole-dipole interaction and hydrogen bonding.

Why do Zr and Hf show similar properties ?

Description : Why do Zr and Hf show similar properties ?

Last Answer :  Ans It is due to similar ionic size which due to lanthanide contraction . 

For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd , then (A) hf = hd (B) hf > hd (C) hf < hd (D) hf could be greater or smaller than hd

Description :  For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd , then (A) hf = hd (B) hf > hd (C) hf < hd (D) hf could be greater or smaller than hd

Last Answer : (C) hf < hd

Which of the following cannot be stored in glass bottle? A. Aqua regia B. HF (Answer) C. HCL D. HBr

Description : Which of the following cannot be stored in glass bottle? A. Aqua regia B. HF (Answer) C. HCL D. HBr

Last Answer : B. HF (Answer)

Efficiency of power transmission (η) through a circular pipe is given by (ht - hf )/ht , which has a maximum value of __________ percent. (A) 33:3 (B) 50 (C) 66.6 (D) 88.8

Description : Efficiency of power transmission (η) through a circular pipe is given by (ht - hf )/ht , which has a maximum value of __________ percent. (A) 33:3 (B) 50 (C) 66.6 (D) 88.8

Last Answer : (C) 66.6