Some Basic Concepts of Chemistry

20 mL of 2 M NaOH solution is added to 400 mL of 0.5 M NaOH solution. The final concentration of the solution is 10-2 M. (Nearest integer)

The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 'A' 1012 hertz and that has a radiant intensity in that direction of 1'B' watt per steradian. 'A' and 'B' are respectively

1. 450 and 683
2. 540 and 1683
3. 540 and 683
4. 450 and 1683

Combustion of glucose ( C6H12O6) produces CO2 and water. The amount of oxygen (in g) required for the complete combustion of 900 g of glucose is : [Molar mass of glucose in g mol-1 = 180]

1. 32
2. 480
3. 800
4. 960

The density of 'x' M solution ('x' molar) of NaOH is 1.12 g mL-1, while in molality, the concentration of the solution is 3 m ( 3 molal). Then x is (Given : Molar mass of NaOH is 40 g/mol)

1. 3.8
2. 3.0
3. 3.5
4. 2.8

Molality (m) of 3M aqueous solution of NaCl is : (Given : Density of solution = 1.25 g mL-1, Molar mass in g mol-1 : Na - 23, Cl - 35.5)

1. 2.90 m
2. 3.85 m
3. 1.90 m
4. 2.79 m

The incorrect postulates of the Dalton's atomic theory are : Choose the correct answer from the options given below :

1. (B), (D) only
2. (A), (B), (D) only
3. (B), (D), (E) only
4. (C), (D), (E) only

An organic compound has 42.1\% carbon, 6.4\% hydrogen and the remainder is oxygen. If its molecular weight is 342, then its molecular formula is :

1. C14H20O10
2. C12H22O11
3. C12H20O12
4. C11H18O12

The number of moles of methane required to produce 11 g CO2(g) after complete combustion is : (Given molar mass of methane in g mol-1 : 16)

1. 0.35
2. 0.25
3. 0.5
4. 0.75

The Molarity (M) of an aqueous solution containing 5.85 g of NaCl in 500 mL water is : (Given : Molar Mass Na : 23 and Cl : 35.5 g mol-1)

1. 20
2. 4
3. 2
4. 0.2

Choose the Incorrect Statement about Dalton's Atomic Theory

1. Compounds are formed when atoms of different elements combine in any ratio.
2. Matter consists of indivisible atoms.
3. Chemical reactions involve reorganization of atoms
4. All the atoms of a given element have identical properties including identical mass.