Test: Some Basic Concepts Of Chemistry - NEET MCQ

Physical properties are those which can be measured or observed without changing the identity or composition of the substance.

Molar mass = 2(27) +3 (16) = 102g.

M, Kg, A are SI units.

Molarity is defined as no. of moles of solute present per litre of solution.

Moles of CO =8 moles Moles of Fe₂O₃= 2.5 moles.

3 moles of CO is needed for 1 mole of Fe₂O₃ so 8 moles of CO will require 2.66 mole of Fe₂O₃ so Fe₂O₃ is limiting reagent.

1 mole of Fe₂O₃ produce 2 mole of Fe so 2.5 mole of Fe₂O₃will produce 5 mole of Fe = 280g of Fe.

Also 1 mole of Fe₂O₃ also produce 3 mole of CO₂ so 2.5 mole of Fe₂O₃ will produce 7.5 mole of CO₂=330g.

According to this total mass of reactants = total mass of product so no. of atoms of each element in reactant is equal to no. of atoms of that element in product

Molar mass = 6(12) + 10(1) + 5(16) = 162g

C-0/100-0 = F-32/180.
C/5= F-32/9.
C/5= 100-32/9.
C/5= 68/9.
C= 68×5/9.
C= 340/9.
C= 37.77.
C= 37.8

Density = mass/volume. SI unit of mass is kg and that of volume is m³ so SI unit of Density is kg m⁻³

The calculation of masses (sometimes volumes also) of the reactants and the products involved in a chemical reaction is called stoichiometry.

Molar mass = 40 + 12 + 3(16) = 100g

Since we know that 1litre -1000ml 1ml-1\1000litre So,12ml-1/1000×12=12/1000 =0.012

K = °C + 273.15

Molecular mass will be = 6(12) + 12(1) + 6(16) = 180u.

Molar mass of AgNO₃ = mass of Ag + N + O₃ = 107.87 + 14 + 3* 16 = 107. 87 + 14 + 48 = 169.87 g

Chemical Formula: ZnSO₄
Molar Mass: 161.47 g/mol (anhydrous)

Standard temperature and pressure (STP) is defined as 0 degrees Celsius and 1 atmosphere of pressure. At STP, 1 mole of any gas occupies 22.4 liters.
First, calculate the number of moles of hydrogen gas (H2) in 67.2 liters:
67.2 L / 22.4 L/mole = 3 moles of H2
Each molecule of H2 contains 2 atoms of hydrogen. Therefore, 3 moles of H2 contains:
3 moles * (6.022 x 10^23 molecules/mole) * 2 atoms/molecule = 3.6132 x 10^24 atoms of hydrogen.

n can vary from to 10 and can be +ve or –ve.

Correct option is A
The stock solution is the solution of higher concentration. Therefore in the laboratory, a solution of the desired concentration is prepared by diluting a stock solution.
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Hence, option A is correct

18g H₂O = 1mol water = 6.02 x 10²³ molecules of water = 6.02 x 10²³ atoms of oxygen.

Chemistry does not deal in explaining superconductivity.

Solid
Holds shape
Fixed Volume


Liquid
Shape of Container
Free Surface
Fixed Volume


Gas
Shape Of Container
Volume of Container

Explanation:

Solid is the only state of matter that has a definite shape and definite volume.

Molality is defined as no. of moles of solute present per kg of solvent.

1L=1000mL so 0.00005L=0.05mL.