Class 11 Chemistry - Basic Concepts - MERIT YARD
Class 11 Chemistry - Basic Concepts - MERIT YARD
1 / 40What is the standard SI unit of 'Amount of substance'?
A) Kilogram
B) Mole
C) Candela
D) Kelvin
2 / 40The "Law of Conservation of Mass" was formulated by:
A) John Dalton
B) Joseph Proust
C) Antoine Lavoisier
D) Gay Lussac
3 / 40What is the exact numerical value of Avogadro's number \( (N_A) \)?
A) \( 6.022 \times 10^{23} \)
B) \( 6.022 \times 10^{-23} \)
C) \( 6.022 \times 10^{22} \)
D) \( 6.022 \times 10^{24} \)
4 / 40Calculate the exact molar mass of water
\( (H_2O) \).
A) \( 16 \text{ g/mol} \)
B) \( 20 \text{ g/mol} \)
C) \( 10 \text{ g/mol} \)
D) \( 18 \text{ g/mol} \)
5 / 40What is the empirical formula of Glucose
\( (C_6H_{12}O_6) \)?
A) \( C_6H_{12}O_6 \)
B) \( CH_3O \)
C) \( CH_2O \)
D) \( CHO \)
6 / 40Find the total number of significant figures in \( 0.0025 \).
A) \( 4 \)
B) \( 2 \)
C) \( 3 \)
D) \( 5 \)
7 / 40Which metric prefix strictly represents the multiplier \( 10^{-9} \)?
A) Micro
B) Pico
C) Centi
D) Nano
8 / 40The correct mathematical formula for calculating Density is:
A) \( \frac{\text{Mass}}{\text{Volume}} \)
B) \( \text{Mass} \times \text{Volume} \)
C) \( \frac{\text{Volume}}{\text{Mass}} \)
D) \( \text{Mass} + \text{Volume} \)
9 / 40Calculate the exact molecular mass of Carbon Dioxide
\( (CO_2) \).
A) \( 28 \text{ u} \)
B) \( 44 \text{ u} \)
C) \( 32 \text{ u} \)
D) \( 16 \text{ u} \)
10 / 40At Standard Temperature and Pressure (STP), exactly 1 mole of any ideal gas occupies a volume of:
A) \( 11.2 \text{ L} \)
B) \( 24.2 \text{ L} \)
C) \( 22.4 \text{ L} \)
D) \( 10.0 \text{ L} \)
11 / 40The "Law of Definite Proportions" was famously stated by:
A) John Dalton
B) Antoine Lavoisier
C) Amedeo Avogadro
D) Joseph Proust
12 / 40Isotopes of the same element strictly have the exact same:
A) Atomic number
B) Mass number
C) Number of neutrons
D) Physical properties
13 / 40Which of the following substances is strictly classified as a compound?
A) Air
B) Oxygen gas \( (O_2) \)
C) Water \( (H_2O) \)
D) Iron \( (Fe) \)
14 / 40What is the correct and standard chemical symbol for Sodium?
A) \( \text{Na} \)
B) \( \text{S} \)
C) \( \text{So} \)
D) \( \text{K} \)
15 / 40Which fundamental subatomic particle carries a positive electrical charge?
A) Electron
B) Proton
C) Neutron
D) Photon
16 / 40In the chemical reaction \( C + O_2 \rightarrow CO_2 \), Carbon (C) is defined as a:
A) Catalyst
B) Product
C) Solvent
D) Reactant
17 / 40The standard fundamental SI unit of Temperature is:
A) Celsius \( (^\circ C) \)
B) Kelvin \( (K) \)
C) Fahrenheit \( (^\circ F) \)
D) Joule \( (J) \)
18 / 40Molarity is mathematically defined as the number of moles of solute dissolved per:
A) Kilogram of solvent
B) Kilogram of solution
C) Liter of solvent
D) Liter of solution
19 / 40The exact mass of one mole of a substance in grams is scientifically called its:
A) Molar mass
B) Atomic mass
C) Equivalent mass
D) Formula mass
20 / 40One atomic mass unit (1 amu or 1 u) is defined exactly as:
A) Mass of 1 Hydrogen atom
B) Mass of 1 Oxygen-16 atom
C) \( \frac{1}{12}^{\text{th}} \) mass of a Carbon-12 atom
D) Mass of 1 Proton
21 / 40Calculate the exact molecular mass of Oxygen gas
\( (O_2) \).
A) \( 32 \text{ u} \)
B) \( 16 \text{ u} \)
C) \( 8 \text{ u} \)
D) \( 64 \text{ u} \)
22 / 40The "Law of Multiple Proportions" was first proposed by:
A) Joseph Proust
B) John Dalton
C) Gay Lussac
D) Avogadro
23 / 40What is the standard fundamental SI unit of mass?
A) Gram
B) Milligram
C) Tonne
D) Kilogram
24 / 40The correct chemical formula for Glucose is:
A) \( C_6H_6O_6 \)
B) \( C_{12}H_{22}O_{11} \)
C) \( C_6H_{12}O_6 \)
D) \( CH_2O \)
25 / 40How many exact moles are present in \( 18 \text{ g} \) of water \( (H_2O) \)?
A) \( 1 \text{ mole} \)
B) \( 2 \text{ moles} \)
C) \( 0.5 \text{ mole} \)
D) \( 18 \text{ moles} \)
26 / 40The simplest whole number ratio of atoms present in a compound gives its:
A) Structural formula
B) Molecular formula
C) Chemical equation
D) Empirical formula
27 / 40Find the total number of significant figures in \( 2.005 \).
A) \( 2 \)
B) \( 3 \)
C) \( 4 \)
D) \( 1 \)
28 / 40A completely homogeneous mixture of two or more substances is scientifically known as a:
A) Compound
B) Solution
C) Suspension
D) Colloid
29 / 40In the balanced equation \( N_2 + 3H_2 \rightarrow 2NH_3 \), exactly 1 mole of \( N_2 \) produces:
A) \( 1 \text{ mole of } NH_3 \)
B) \( 3 \text{ moles of } NH_3 \)
C) \( 2 \text{ moles of } NH_3 \)
D) \( 4 \text{ moles of } NH_3 \)
30 / 40What is the correct chemical symbol for Potassium?
A) \( \text{K} \)
B) \( \text{P} \)
C) \( \text{Po} \)
D) \( \text{Pt} \)
31 / 40The approximate mass percentage of Hydrogen (H) in water \( (H_2O) \) is:
A) \( 88.8\% \)
B) \( 50.0\% \)
C) \( 25.0\% \)
D) \( 11.1\% \)
32 / 40The metric prefix 'kilo' strictly represents which standard multiplier?
A) \( 10^2 \)
B) \( 10^3 \)
C) \( 10^{-3} \)
D) \( 10^6 \)
33 / 40The reactant which gets completely consumed first during a chemical reaction is called:
A) Excess reagent
B) Product
C) Catalyst
D) Limiting reagent
34 / 40Exactly 1 Litre is mathematically and scientifically equal to:
A) \( 10 \text{ cm}^3 \)
B) \( 100 \text{ cm}^3 \)
C) \( 1000 \text{ cm}^3 \)
D) \( 1 \text{ cm}^3 \)
35 / 40Which of the following concentration terms is completely independent of temperature?
A) Molality
B) Molarity
C) Formality
D) Normality
36 / 40The total sum of the mole fractions of all components in a solution is always:
A) \( 100 \)
B) \( 1 \)
C) \( 0 \)
D) \( 10 \)
37 / 40The standard SI unit of Molality (m) is:
A) \( \text{mol / L} \)
B) \( \text{L / mol} \)
C) \( \text{mol / kg} \)
D) \( \text{kg / mol} \)
38 / 40A molecular formula is always a simple integer multiple of the:
A) Empirical formula
B) Structural formula
C) Molar mass
D) Atomic mass
39 / 40The number of atoms present in exactly 1 mole of Carbon is:
A) \( 12 \)
B) \( 1 \)
C) \( 6 \)
D) \( N_A \text{ (Avogadro's Number)} \)
40 / 40A chemical equation must always be balanced to strictly satisfy the:
A) Law of multiple proportions
B) Law of conservation of mass
C) Avogadro's law
D) Law of definite proportions
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