If A is 20% more than C and B is 60% more than C then A is what percentage of B? Darshan classes 63,2 тыс. подписчиков Скачать
In an election only two candidates Ram and Shyam contested Ram got 75% of the total valid votes. Скачать
A vendor purchased some apples out of which 6% were rotten. If the number of rotten apples was 51 Скачать
P Q and R contested in an election. All the votes polled were valid. P got 30% of the total votes. Скачать
In an election there are three contestants A B and C. A secured 30% of the votes and B secured 60% Скачать
In an examination Mohit secured 60% of the maximum marks which is more than the pass marks by 45 Скачать
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Which of the following pairs of elements would have a more negative electron gain enthalpy? (i) O Скачать
What are the various factors due to which the ionization enthalpy of the main group elements tends Скачать
Consider the following species : N3–, O2–, F–, Na+, Mg2+ and Al3+ (a) What is common in them? Скачать
What do you understand by isoelectronic species? Name a species that will be isoelectronic with each Скачать
Which element do you think would have been named by (i) Lawrence Berkeley Laboratory (ii) Seaborg's Скачать
On the basis of quantum numbers justify that the sixth period of the periodic table should have 32 Скачать
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Show by a chemical reaction with water that Na2O is a basic oxide and Cl2O7 is an acidic oxide. Скачать
Using the Periodic Table predict the formulas of compounds which might be formed by the following Скачать
Which of the following will have the most negative electron gain enthalpy and which least negative Скачать
The first ionization enthalpy ∆iH values of the third period elements Na Mg and Si are respectively Скачать
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The elements Z = 117 and 120 have not yet been discovered. In which family/group would you place Скачать
Determine the osmotic pressure of a solution prepared by dissolving 25 mg of K2SO4 in 2 litre Скачать
Determine the amount of CaCl2 (i = 2.47) dissolved in 2.5 litre of water such that its osmotic Скачать
100 g of liquid A (molar mass 140 g/mol) was dissolved in 1000 g of liquid B (molar mass 180 g/mol). Скачать
Vapour pressure of water at 293 K is 17.535 mm Hg. Calculate the vapour pressure of water at 293 K Скачать
19.5 g of CH2FCOOH is dissolved in 500 g of water. The depression in the freezing point of water Скачать
Calculate the depression in the freezing point of water when 10 g of CH3CH2CHClCOOH is added to 250g Скачать
Calculate the amount of benzoic acid (C6H5COOH) required for preparing 250 mL of 0.15 M solution Скачать
Nalorphene (C19H21NO3 ) similar to morphine is used to combat withdrawal symptoms in narcotic users Скачать
Calculate the mass percentage of aspirin (C9H8O4 ) in acetonitrile (CH3CN) when 6.5 g of C9H8O4 Скачать
If the solubility product of CuS is 6 × 10^–16 calculate the maximum molarity of CuS in aqueous Скачать
At 300 K 36 g of glucose present in a litre of its solution has an osmotic pressure of 4.98 bar. Скачать
Two elements A and B form compounds having formula AB2 and AB4 . When dissolved in 20 g of benzene Скачать
A solution containing 30 g of non-volatile solute exactly in 90 g of water has a vapour pressure Скачать
Calculate the mass of a non-volatile solute (molar mass 40 g/mol) which should be dissolved in 114 g Скачать
The vapour pressure of water is 12.3 kPa at 300 K. Calculate vapour pressure of 1 molal solution Скачать
Heptane and octane form an ideal solution. At 373 K the vapour pressures of the two liquid component Скачать
An aqueous solution of 2% non-volatile solute exerts a pressure of 1.004 bar at the normal boiling Скачать
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An antifreeze solution is prepared from 222.6 g of ethylene glycol (C2H6O2 ) and 200 g of water. Скачать
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A solution of glucose in water is labelled as 10% w/w what would be the molality and mole fraction Скачать
Concentrated nitric acid used in laboratory work is 68% nitric acid by mass in aqueous solution. Скачать
Define the following terms: (i) Mole fraction (ii) Molality (iii) Molarity (iv) Mass percentage. Скачать
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Calculate the mass of ascorbic acid (Vitamin C C6H8O6 ) to be dissolved in 75 g of acetic acid Скачать
Boiling point of water at 750 mm Hg is 99.63°C. How much sucrose is to be added to 500 g of water Скачать
Vapour pressure of pure water at 298 K is 23.8 mm Hg 50 g of urea (NH2CONH2 ) is dissolved in 850 g Скачать
Henry’s law constant for CO2 in water is 1.67×10^8 Pa at 298 K. Calculate the quantity of CO2 in 500 Скачать
Calculate (a) molality (b) molarity and (c) mole fraction of KI if the density of 20% (mass/mass) Скачать
Calculate the mass of urea (NH2CONH2) required in making 2.5 kg of 0.25 molal aqueous solution. Скачать
Calculate the molarity of each of the following solutions: (a) 30 g of Co(NO3)2. 6H2O in 4.3 L Скачать
Calculate the mole fraction of benzene in solution containing 30% by mass in carbon tetrachloride. Скачать
Calculate the mass percentage of benzene (C6H6) and carbon tetrachloride (CCl4) if 22 g of benzene Скачать