Questions asked by Vikas M.

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• If 10 raise to power 21 molecules are removed from 200 mg of CO2,then how many moles of CO2 are left?(Old and urgently dear experts)
  
• A solution of NaOH in water is:(i)golden yellow in colour (ii) pale green in colour (iii)sky blue in colour (IV)colourless (PLs experts and urgently with reasoning)?
  
• In which of the following solution metallic ion can be displaced by aluminium : (i)CuSO4(ii)NaCL(CaCl2(IV)MgSO4 ?
  
• Conc.HNO3 can be transported in aluminium containers.Explain why?
  
• A gas at pressure of 5.0 bar from 0 to 546°c and simultaneously compressed to one third of its original volume.What will be the final pressure in bar?
  
• 1000 W to 250 V of electric kettle is used to bring water at 20°c to its boiling point.If kettle is used for 11 mins and 12 secs, calculate:(1) resistance (2) current and (3) mass of water in the kettle ? (PLS ANS URGENTLY I Request you)?
  
• Physics question below ?
  
• Physics question? [info in the description]
  
• Explain why water has higher boiling and melting point as compared to H2S ?(PLs ans URGENTLY)
  
• A large no.of fish are suddenly found suddenly floating dead on lake.There is no evidence of toxic dumping but you can find an abundance of phytoplankton.Suggest a reason why were the dish found dead?
  
• A certain sum of money at compound interest becomes Rs 7396 in 2 years and Rs 7950.70 in 3 years.Find the rate of interest?(PLs I REQUEST you for URGENT ans)?
  
• Evaluate the following?
  
• Evaluate the following?
  
• Evaluate the following ?
  
• Evaluate the following?
  
• Express the following as pure radicals : #7sqrt(5)# ?
  
• The electron gain enthalpy of fluorine is less negative than that of chlorine while it is expected to be more negative . Explain ?
  
• O negative ion is formed by release of energy and O 2- ion is formed by gain of energy.Explain?
  
• Calculate the enthalpy of formation of acetic acid if its anthalpy of combustion to CO2 and H2O is - 867 kJ/mol and the enthalpies of formation of CO2 and H2O are respectively - 393.5 and -285.9 kJ / mol ?
  
• A boy runs at a speed of 20 m/s.How much time will he take to cover a distance of 1 km?
  
• A race boat covers a distance of 60 km downstream in one and a half hour.It covers this distance upstream in 2 hrs. The speed of race boat in still water is 35 km/hr.Find the speed of the stream ?
  
• ABCD is a quad. in which AB = CD and AD = BC ? Show that it is a //gm .
  
• The sum of 2 nos is 4000 . If 15 % of one is equal to 25% of the other no. Find the nos ?
  
• Three nos are in the ratio 3:4:5 . If the sum of the largest and the smallest equals the sum of the third and 52. Find the numbers ?
  
• Bhagwanti inherited Rs 12000 . She invested part of it as 10 % and the rest at 12 %.Her annual income from these investments is Rs 1280 .How much did she invest at each rate ?
  
• If i add four times a number, the result is five less than five times the number . What is my number ?
  
• ABCD is a rhombus . If angle ADB = 50 , find the angles of the rhombus ?
  
• Explain why #"Li"_2"CO"_3# decomposes at a lower temperature, whereas #"Na"_2"CO"_3# decomposes at a higher temperature?
  
• 2 / 3 of a number is 20 less than a no. Find the number?
  
• There are students and benches in a classroom . If 4 students sit in each bench, 3 benches are left vacant.But if 3 students sit in a bench, 3 students are left standing.What are the total no. of students ?
  
• Suman takes 3 hrs more than rashmi in walking.If suman doubles her speed,she will take 2 hrs less than Rashmi.If speed of rashmi is 1.5 km/hr.Find the speed of Rashmi and Suman ?
  
• Average of 7 numbers is 6.What is 8th no. to be added if the average increases by 10 ?
  
• ABCD is a trep. with AB//DC and AD = BC. If AD is parallel to CE and angle A is 70 degrees.Find all the angles ? Diagram is given below.
  
• The H.C.F of 2 nos, is 1/28 of their L.C.M and the sum of the L.C.M and the H.C.F is 116.If one of the numbers is 1`6, find the other?
  
• The traffic lights at 4 different crossings at intervals of 48, 72, 90 and 108 seconds respectively. If these lights change together at 7:05 p.m. , when will they change together again ?
  
• A drum of kerosene oil is 3/4 full. When 15 litres of oil is drawn from it, it is 7/12 full.Find the total capacity of the drum ?
  
• Sukhdev had a son and a daughter. He decided to divide his property among his children, #2/5# of his property to his son and #4/10# to his daughter and rest in a charitable trust. Whose share was more son or a daughter? What you feel about his decision?
  
• Rohit donated 1/5 of his monthly income to N.G.O. working for education of girl child,spent 1/4 of his salary on food,1/3 on rent and 1/15 on other expenses. He is left with Rs 9000.Find Rohit,s monthly salary?
  
• A car after completing its journey returns to its original position.Name two physical quantities which are zero of the car and explain why?
  
• A satellite moves around the earth in a circular orbit with constant speed.Explain is the motion uniform or accelerated ?
  
• What is the displacement of a satellite when it makes a complete round trip along a circular path ? Explain with reasoning ?
  
• Explain when a ball is dropped from roof of a building,is motion uniform or non uniform?
  
• A dog initially running at a speed of 2 m/s accelerates at constant rate of 1.5 m/s2 for 5 s.Calculate:(1) distance covered by it from start (2) the final velocity of the dog?
  
• A racing car initially at rest accelerates at uniform rate of 5.5 m/s2 for 10s.Calculate: (1)distance covered by racing car from start (2) final velocity in km/h?
  
• SOLVE : 2-3 + 4-5 + 6-7....................+40 ?
  
• Question below?
  
• The cost price of a printer is Rs 3400 which is 15% below the marked price.If the article is sold at a discount of 10%.Find: (1) M.P. (2) S P. (3) Profit (4) Profit % ?
  
• Calculate the percentage composition of chromium in potassium dichromate?