52639 + Interview Questions in Secondary School in Chemistry

1.	What is aqua regia? How it is helpful in dissolving noble metals?(Standard 10 questionChemistry .) please try answering the second part of answer.
Answer» Answer: Aqua REGIA is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. Aqua regia is a yellow-orange fuming liquid, so named by alchemists because it can dissolve the noble metals GOLD and platinum, THOUGH not all metals. Currently, aqua regia, a mixture of concentrated nitric acid and hydrochloric acid, usually in a molar ratio of 1:3, is used to dissolve noble metals. This ALLOWS these RELATIVELY rare elements to be retrieved from worn-out and scrapped catalytic converters and other equipment.

1.

What is aqua regia? How it is helpful in dissolving noble metals?(Standard 10 questionChemistry .) please try answering the second part of answer.

Answer»

Answer:

Aqua REGIA is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. Aqua regia is a yellow-orange fuming liquid, so named by alchemists because it can dissolve the noble metals GOLD and platinum, THOUGH not all metals.

Currently, aqua regia, a mixture of concentrated nitric acid and hydrochloric acid, usually in a molar ratio of 1:3, is used to dissolve noble metals. This ALLOWS these RELATIVELY rare elements to be retrieved from worn-out and scrapped catalytic converters and other equipment.

12.	Heating curveter waxHes in a200 -150 -Hydre10050 -SulisCH1 2 3 4 5 6 7 8 9 10 11 12What is the melting point of this wa(b) How long is it before all the wax hasWhat is the boiling point of this wa(d) Why do we say 'wax vapour' andgaseous wax
Answer» I’m sorry Explanation: I don’t KNOW the ANSWR

20.	An organic compound Á’ (C3H8O) is resistant to oxidation and Tollen’s reagent but formscompound B on reduction. B reacts with HBr to form compound C. C on reaction with Mg formsGrignard reagent D which reacts with A to form a product which on hydrolysis gives E. Identify A toE and write the reaction involved.please help fast
Answer» the DIAGONAL of a quadrateral interest each other of right angle PROVE that the sum of the SQUARES of opposite side is equal

26.	Calculate the GCV and NCV of the coal in calorie per gram if coal contains 12% Hydrogen.(Latent heat of water vapour is 587 cals/gram )
Answer» (18)38+838;₹(+2(((<1(8

37.	Idh-bnpf-rwbin the forest at LEGO® Friends Mia's House! ... Small parts and Small Ball. ... chairs, a well to fetch water for Mia's horse Metzie, and a grooming area where she can be groomed.
Answer» Ofugkhdjgdhkfhkfljflh

Explore topic-wise InterviewSolutions in Current Affairs.

What is aqua regia? How it is helpful in dissolving noble metals?(Standard 10 questionChemistry .) please try answering the second part of answer.​

The best method to separate the components of InkA) EvaporationB) VaporizationC) DistillationD) Sublimation​

a) EVAPORATION

Why carbon is called backbone of lifedont give wrong answer or wanna i will report u

Reactoreaction13CO2(9)Given CO(g) + 2O2(g)Hz(9) + { O2(9)H2O(g)AH = -283 kJ moltH20(1) AH = -286 kJ mor?H2O(1) AH = 44 kJ mor?286what is the change in enthalpy, AH, for the following reaction?CO2(g) + H2(g) → CO(g) + H2O(9)-2с +41 kJ mol-?A -525 kJ mor' B 41 kJ mor1D +525 kJ mot- 283+ (-286)569

If a compound does not have different number of carbons on either side of the functional group will they be considered as metamers?For Example: 1-Methoxy propane and Ethoxy ethane are metamers, but will 1-Methoxy propane and 2-Methoxy propane be considered as metamers?​

2.Identify A, B and C etc. In the following reactionsB2H,1) CH3 - CH = CH2H2O2/OH→ AB[O]KMnO4/H2SO4 HI / red PC СD[O][0]"DY​

Different gases of air can be separated by :a) fractional distillation b) fractional sublimationc) fractional crystallizationd) filtration​

For the reaction 2A + B → C, rate of disappearance of A 0.076 mols-1.a) What is the rate of formation of C?b) What is the rate of consumption of B?c) What is the rate of the overall reaction?​

9 HUNHorgo(d) decreased nuclear UldiyuWir(c) similar electronic configurationGive short answers)Write the valence shell electronic configuration of an element present in the 30ele​

Compound 'X' is the second member of the homologous series which has ageneralformulaC.H.Write the name of the series and the structural formula of thecompound X.​

Heating curveter waxHes in a200 -150 -Hydre10050 -SulisCH1 2 3 4 5 6 7 8 9 10 11 12What is the melting point of this wa(b) How long is it before all the wax hasWhat is the boiling point of this wa(d) Why do we say 'wax vapour' andgaseous wax​

1.what is charge and types of charge.and formula.hii.I'm gud and what about you.gud evening​

Collect metal vessels and various metalarticles.Write detailed information. Write steps inthe procedure that can be done in the laboratoryfor giving glitter to these. Seek guidance fromyour teacher​

Q4. Give IUPAC name of the compound given below.CH, CH-CH-CH-CHŁCH,CIOH(a) 2-Chloro-5-hydroxyhexane(b) 2-Hydroxy-5-chlorohexane(C) 5-Chlorohexan-2-ol(d) 2-Chlorohexan-5-ol​

These heterostoms and the group containing theseconfer specific properties to the compound , regardless ofthe length and nature of carbon chain and hence arecalled functional group. can anyone explain plz​

31. A capacitor of capacitance C is charged to apotential difference V from a cell and thendisconnected from it. A charge +q, is now given toits negative plate. The potential difference acrossthe capacitor will be(1) V(2) V-2C(3) V+Q(4) V + -20​

Which of the following will have the highest boiling point?a) Methanalb) Ethanal c) Propanal d) 2-HexanoneAND please define their Boiling points also.​

What is depression?Mele friends meinse koi on ny hai shayad...​

HELLO Bestu... KAISI HAI?

I Really miss u yr...

1. Which of the following is dependent of temperature(a) molarity(b)Molality(c) Mole fration(d) Mass percentage​

Give an example of metal which1 can form alkali2 can be cut with knife

Calculate the GCV and NCV of the coal in calorie per gram if coal contains 12% Hydrogen.(Latent heat of water vapour is 587 cals/gram )​

Assertion: The black coating on silver and the green coating on copper are due to the process called corrosion.Reason: It is an effect of oxidation reaction.

Classify Gum in water, Blood, Copper sulphate solution in water, Chalk dust in water astrue/ colloidal/ suspension solutions.​

3.42 g sucrose are dissolved in 18 g of water in a beaker. The number of oxygen atoms in the solution are?with steps​

Compare optical, filtration and stability properties of True, Colloidal and Suspensionsolutions.​

17- Which was most powerful in Romanempire, before 27 BCESenateConstantineооооO EmperorO Common public​

1. Classify the following into elements, compounds and mixtures.a. Sodiumb. Soil c. Sugar solution d. Silver2. If an atom contains one electron and one proton, will it carry any charge or not?​

Which one of the following compounds of xenon cannot be prepared(a) XeF(b) XeF2(d) XeF.(c) XeF,​

Hydrogen1. BrassCheese from milk2. Sub-atomic particlesElectron, Proton3. metalloidsMixtureCompressiblerefrigerant4. Oxygen in air5. The boiling point of water is6. Gases are highly7. Liquid nitrogen8. Rocket fuel100 CSiliconDesirable changes9. Irreversible changes21%10. Ripening of fruit​

Find out Ph of following:a) 0.2M HClb) 0.03 M H2SO4

Answer⤵️

➜ 0.2M HCL - 1.4 pH

All the BEST :)

In homologous series 2 consecutive hydrocarbons differ by? A) 12uB) 13uC) 14u

Idh-bnpf-rwbin the forest at LEGO® Friends Mia's House! ... Small parts and Small Ball. ... chairs, a well to fetch water for Mia's horse Metzie, and a grooming area where she can be groomed.​

2,8,1;2,8,2;2,8,8,2;2,1a) identify group number of each elementb) which two elements belong to same groupc) compare atomic radii of A,B and D​

The table shows the boiling points of some of the gases present in air.When air is cooled to -200°C, some of these gases liquefy. Which gases liquefy?a. argon, helium, neonb. argon, nitrogen, oxygenc. helium, neon, nitrogend. helium and neon ​

In which of the following, the carbon-oxygen bonds are of equal lengths?(1) CH3COO-(2) CH3COOH(3) CH3COOC2H5(4) All of thesepizza no spam.​

I) Define atomic mass unit.ii) What is the numerical value of mole. iii) Name the elements present in oxide ionin short plz​

An element A whose atomic radius is 0.150 pm crystallises in a bcc unit cell.Calculate the edge length of the unit cell.​

Which of the following is a reaction of dilute hydrochloric acid?a. ammonium chloride reacts to give ammoniab. calcium carbonate reacts to give carbondioxidec. copper reacts to give hydrogend. universal indicator paper turns blue ​

Which of the following is a property of ethanoic acid but is not a property of sulphuric acid?a. it reacts with copper(ll) oxideb. it reacts with sodium carbonatec. it reacts with magnesiumd. it burns in air​

) A solution has 50g of salt in 320g of water. Calculate the mass percent of the salt in thesolution. ii) Name any one Metalloid. iii) What type of change is cutting of wood. ​

0. Define and explain normality with mathematical expression.Calculate the normality of 500 ml of solution containing5.3 gm of Na2CO3.​

.We can identify the leackageof gas in our home.How can we explain this on thebasis of diffusion.

* H C,H,11IUPAC name of CH, -C-C-CH,1 1CH CH(a)(b)(c)3,4,4-tri methyl heptane2-ethyl-3,3-di methyl heptane3,4,4-tri methyl octane2-butyl-2-methyl-3-ethyl Butane7813/SCHJC11​

What is aqua regia? How it is helpful in dissolving noble metals?(Standard 10 questionChemistry .) please try answering the second part of answer.

The best method to separate the components of InkA) EvaporationB) VaporizationC) DistillationD) Sublimation

If a compound does not have different number of carbons on either side of the functional group will they be considered as metamers?For Example: 1-Methoxy propane and Ethoxy ethane are metamers, but will 1-Methoxy propane and 2-Methoxy propane be considered as metamers?

2.Identify A, B and C etc. In the following reactionsB2H,1) CH3 - CH = CH2H2O2/OH→ AB[O]KMnO4/H2SO4 HI / red PC СD[O][0]"DY

Different gases of air can be separated by :a) fractional distillation b) fractional sublimationc) fractional crystallizationd) filtration

For the reaction 2A + B → C, rate of disappearance of A 0.076 mols-1.a) What is the rate of formation of C?b) What is the rate of consumption of B?c) What is the rate of the overall reaction?

9 HUNHorgo(d) decreased nuclear UldiyuWir(c) similar electronic configurationGive short answers)Write the valence shell electronic configuration of an element present in the 30ele

Compound 'X' is the second member of the homologous series which has ageneralformulaC.H.Write the name of the series and the structural formula of thecompound X.

Heating curveter waxHes in a200 -150 -Hydre10050 -SulisCH1 2 3 4 5 6 7 8 9 10 11 12What is the melting point of this wa(b) How long is it before all the wax hasWhat is the boiling point of this wa(d) Why do we say 'wax vapour' andgaseous wax

1.what is charge and types of charge.and formula.hii.I'm gud and what about you.gud evening

Collect metal vessels and various metalarticles.Write detailed information. Write steps inthe procedure that can be done in the laboratoryfor giving glitter to these. Seek guidance fromyour teacher

Q4. Give IUPAC name of the compound given below.CH, CH-CH-CH-CHŁCH,CIOH(a) 2-Chloro-5-hydroxyhexane(b) 2-Hydroxy-5-chlorohexane(C) 5-Chlorohexan-2-ol(d) 2-Chlorohexan-5-ol

These heterostoms and the group containing theseconfer specific properties to the compound , regardless ofthe length and nature of carbon chain and hence arecalled functional group. can anyone explain plz

31. A capacitor of capacitance C is charged to apotential difference V from a cell and thendisconnected from it. A charge +q, is now given toits negative plate. The potential difference acrossthe capacitor will be(1) V(2) V-2C(3) V+Q(4) V + -20

Which of the following will have the highest boiling point?a) Methanalb) Ethanal c) Propanal d) 2-HexanoneAND please define their Boiling points also.

What is depression?Mele friends meinse koi on ny hai shayad...

1. Which of the following is dependent of temperature(a) molarity(b)Molality(c) Mole fration(d) Mass percentage

Calculate the GCV and NCV of the coal in calorie per gram if coal contains 12% Hydrogen.(Latent heat of water vapour is 587 cals/gram )

Classify Gum in water, Blood, Copper sulphate solution in water, Chalk dust in water astrue/ colloidal/ suspension solutions.

3.42 g sucrose are dissolved in 18 g of water in a beaker. The number of oxygen atoms in the solution are?with steps

Compare optical, filtration and stability properties of True, Colloidal and Suspensionsolutions.

17- Which was most powerful in Romanempire, before 27 BCESenateConstantineооооO EmperorO Common public

1. Classify the following into elements, compounds and mixtures.a. Sodiumb. Soil c. Sugar solution d. Silver2. If an atom contains one electron and one proton, will it carry any charge or not?

Which one of the following compounds of xenon cannot be prepared(a) XeF(b) XeF2(d) XeF.(c) XeF,

Hydrogen1. BrassCheese from milk2. Sub-atomic particlesElectron, Proton3. metalloidsMixtureCompressiblerefrigerant4. Oxygen in air5. The boiling point of water is6. Gases are highly7. Liquid nitrogen8. Rocket fuel100 CSiliconDesirable changes9. Irreversible changes21%10. Ripening of fruit

Idh-bnpf-rwbin the forest at LEGO® Friends Mia's House! ... Small parts and Small Ball. ... chairs, a well to fetch water for Mia's horse Metzie, and a grooming area where she can be groomed.

2,8,1;2,8,2;2,8,8,2;2,1a) identify group number of each elementb) which two elements belong to same groupc) compare atomic radii of A,B and D

The table shows the boiling points of some of the gases present in air.When air is cooled to -200°C, some of these gases liquefy. Which gases liquefy?a. argon, helium, neonb. argon, nitrogen, oxygenc. helium, neon, nitrogend. helium and neon

In which of the following, the carbon-oxygen bonds are of equal lengths?(1) CH3COO-(2) CH3COOH(3) CH3COOC2H5(4) All of thesepizza no spam.

I) Define atomic mass unit.ii) What is the numerical value of mole. iii) Name the elements present in oxide ionin short plz

An element A whose atomic radius is 0.150 pm crystallises in a bcc unit cell.Calculate the edge length of the unit cell.

Which of the following is a reaction of dilute hydrochloric acid?a. ammonium chloride reacts to give ammoniab. calcium carbonate reacts to give carbondioxidec. copper reacts to give hydrogend. universal indicator paper turns blue

Which of the following is a property of ethanoic acid but is not a property of sulphuric acid?a. it reacts with copper(ll) oxideb. it reacts with sodium carbonatec. it reacts with magnesiumd. it burns in air

) A solution has 50g of salt in 320g of water. Calculate the mass percent of the salt in thesolution. ii) Name any one Metalloid. iii) What type of change is cutting of wood.

0. Define and explain normality with mathematical expression.Calculate the normality of 500 ml of solution containing5.3 gm of Na2CO3.

* H C,H,11IUPAC name of CH, -C-C-CH,1 1CH CH(a)(b)(c)3,4,4-tri methyl heptane2-ethyl-3,3-di methyl heptane3,4,4-tri methyl octane2-butyl-2-methyl-3-ethyl Butane7813/SCHJC11