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Exam:
326 quizzes
A chemist passes 0.45 mol of chlorine into hot, concentrated sodium hydroxide. How many moles of sodium chlorate form? New
High School (11–12) · Groups 17 and 18: Halogens and Noble Gases
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
A student compares the geometry of four pairs of species. In which pair do both species have the same geometry? New
High School (11–12) · Groups 17 and 18: Halogens and Noble Gases
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
A plant treats 10.2 t of ammonia and every molecule is converted by the Ostwald process into nitric acid. Take the molar masses as 17.0 g/mol and 63.0 g/mol. What mass of pure nitric acid forms? New
High School (11–12) · Groups 15 and 16: Nitrogen and Oxygen Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
When phosphorous acid, H₃PO₃, is heated, the oxidation states of phosphorus in the products are New
High School (11–12) · Groups 15 and 16: Nitrogen and Oxygen Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
The Haber process is run at a higher pressure. At the same temperature, which statement is correct for the equilibrium? New
High School (11–12) · Groups 15 and 16: Nitrogen and Oxygen Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
Carbon is heated with an excess of concentrated sulphuric acid, C + 2H₂SO₄ → CO₂ + 2SO₂ + 2H₂O. How many moles of gas form from 0.14 mol of carbon? Count the steam as a liquid. New
High School (11–12) · Groups 15 and 16: Nitrogen and Oxygen Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
What is the average oxidation state of sulphur in dithionous acid, H₂S₂O₄? New
High School (11–12) · Groups 15 and 16: Nitrogen and Oxygen Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
An engineer suggests piping the gas from the converter of an acid plant straight into a tank of water. The plant manager refuses. What is the main reason? New
High School (11–12) · Groups 15 and 16: Nitrogen and Oxygen Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
Which statement about diborane, B₂H₆, is correct? New
High School (11–12) · Groups 13 and 14: Boron and Carbon Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
A current of 50.0 A is passed through molten alumina until 13.5 g of aluminium forms. For how many hours does it flow? Take F = 96485 C/mol and M(Al) = 26.98 g/mol. New
High School (11–12) · Groups 13 and 14: Boron and Carbon Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
Assertion (A): Boron trifluoride reacts with ammonia to form an adduct. Reason (R): The boron atom in boron trifluoride has an incomplete octet and an empty p orbital. New
High School (11–12) · Groups 13 and 14: Boron and Carbon Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
An impure sample of boric acid of mass 0.640 g is dissolved in water, mannitol is added, and the mixture is titrated as a monobasic acid with sodium hydroxide. It needs 38.0 mL of solution of concentration 0.250 mol/L. What is the percentage of boric acid in the sample? Take M = 61.83 g/mol. New
High School (11–12) · Groups 13 and 14: Boron and Carbon Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
Carbon tetrachloride does not react with water, but silicon tetrachloride does. The best reason is that New
High School (11–12) · Groups 13 and 14: Boron and Carbon Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
Silicones are polymers that are used in sealants and for waterproofing. Which statement about them is correct? New
High School (11–12) · Groups 13 and 14: Boron and Carbon Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
How many hexagons are on the surface of a fullerene that has 100 carbon atoms, each bonded to three others, with 12 pentagons? New
High School (11–12) · Groups 13 and 14: Boron and Carbon Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
A closed vessel of volume 7.00 L at 310 K holds 22.0 g of carbon dioxide that came from evaporated dry ice. Take R = 0.08206 L atm/(K mol) and M = 44.01 g/mol. What is the pressure of the gas? New
High School (11–12) · Groups 13 and 14: Boron and Carbon Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
A compound has the formula TlI3 and is a thallium compound. Which explanation of its constitution is correct? New
High School (11–12) · Groups 13 and 14: Boron and Carbon Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
Water is added to a sample of 5.76 g of the carbide Al₄C₃ (143.96 g/mol), which contains the methanide ion. What volume of the hydrocarbon gas that bubbles off is formed at 273 K and 1 atm? Take 22.4 L/mol. New
High School (11–12) · Groups 13 and 14: Boron and Carbon Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
Assertion (A): Lead(IV) oxide gives chlorine with concentrated hydrochloric acid. Reason (R): Lead(IV) is less stable than lead(II), because of the inert pair effect, and it takes electrons readily. New
High School (11–12) · Groups 13 and 14: Boron and Carbon Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
How many of these are electron deficient: B₂H₆, (AlH₃)n, CH₄, NH₃ and H₂O? New
High School (11–12) · Groups 13 and 14: Boron and Carbon Families
JEE AdvancedA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Advanced
The α and β anomers of a sugar have specific rotations of +140 degrees and +40 degrees. A solution of either anomer settles to +100 degrees. What percentage of the settled mixture is the α anomer? New
High School (11–12) · Biomolecules
JEE AdvancedA-LevelIB+24A-LevelIB
StemPy LabStemPy Lab
Hard
A 2-ketoheptose has a straight chain of seven carbon atoms with the C=O group on C-2. How many stereoisomers does it have? New
High School (11–12) · Biomolecules
JEE AdvancedA-LevelIB+24A-LevelIB
StemPy LabStemPy Lab
Hard
Assertion (A): Milk curdles when it turns sour. Reason (R): The acid brings the pH close to the isoelectric point of casein, where the protein has no net charge and clumps together. New
High School (11–12) · Biomolecules
JEE AdvancedA-LevelIB+24A-LevelIB
StemPy LabStemPy Lab
Hard
By how much, in kJ/mol, must an enzyme lower the activation energy of a reaction at 298 K to make it exactly ten times faster? Use R = 8.314 J/(mol K) and assume the same frequency factor. New
High School (11–12) · Biomolecules
JEE AdvancedA-LevelIB+24A-LevelIB
StemPy LabStemPy Lab
Hard
How many stereoisomers does the dipeptide Ala-Thr have? Count every combination of D and L at each stereocentre. Alanine has one stereocentre and threonine has two. New
High School (11–12) · Biomolecules
JEE AdvancedA-LevelIB+24A-LevelIB
StemPy LabStemPy Lab
Hard
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