CBSE Class 11 Some Basic Concepts of Chemistry — practice questions
40 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 11 Some Basic Concepts of Chemistry in the app →Per NCERT Class 11 Chemistry Ch 1, who proposed the LAW OF CONSERVATION OF MASS in 1789?Per NCERT, the LAW OF CONSERVATION OF MASS states that in any physical or chemical change there is no NET chanPer NCERT, who proposed the LAW OF DEFINITE PROPORTIONS — using natural + synthetic cupric carbonate samples tPer NCERT, the LAW OF DEFINITE PROPORTIONS states that a given compound always contains exactly the same propoPer NCERT, who proposed the LAW OF MULTIPLE PROPORTIONS in 1803?Per NCERT, hydrogen + oxygen form water (2g H + 16g O → 18g H₂O) and hydrogen peroxide (2g H + 32g O → 34g H₂OPer NCERT, who proposed the LAW OF GASEOUS VOLUMES in 1808?Per NCERT, Gay Lussac's law states that when gases combine or are produced in a reaction they do so in a simplPer NCERT, who proposed AVOGADRO'S LAW (1811) — that equal volumes of all gases at the same T and P contain eqPer NCERT, in the Karlsruhe conference (1860, Germany), which scientist presented a 'sketch of a course of chePer NCERT 'Development of Chemistry' box, which ancient Indian sage formulated an atomic theory (~600 BCE) witPer NCERT, in 1808 Dalton published 'A New System of Chemical Philosophy' which COULD explain the laws of chemPer NCERT Class 11 Chemistry, what is the SI definition of the MOLE — adopted in 2019 redefinition?Per NCERT, the AVOGADRO CONSTANT (N_A) has the approximate value of which?Per NCERT, an 'elementary entity' (whose mole is counted by Avogadro's number) can be which of these?Per NCERT, 1 mole of WATER MOLECULES contains how many water molecules?Per NCERT, what is the MASS PERCENTAGE of hydrogen in WATER (H₂O) — given molar masses C=12, H=1.008, O=16?Per NCERT, what is the MASS PERCENTAGE of oxygen in WATER (H₂O)?Per NCERT, what is the EMPIRICAL formula of a compound?Per NCERT, what is the MOLECULAR formula of a compound?Per NCERT, the empirical formula of glucose is CH₂O. Given molar mass = 180 g/mol, what is the MOLECULAR formuPer NCERT Problem 1.2, a compound has 4.07% H, 24.27% C, 71.65% Cl, with molar mass 98.96 g. What is its EMPIRPer NCERT Problem 1.2, what is the MOLECULAR formula of the compound (empirical CH₂Cl, molar mass 98.96 g)?Per NCERT, the MASS PER CENT of an element in a compound is calculated using which formula?Per NCERT Class 11 Chemistry, what is STOICHIOMETRY — derived from two Greek words?Per NCERT, what does the BALANCED CHEMICAL EQUATION CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g) tell us about MOLE relaPer NCERT, what is the LIMITING REAGENT in a chemical reaction?Per NCERT Problem 1.3, what mass of WATER is produced by the combustion of 16 g of methane (CH₄)?Per NCERT §Balancing a chemical equation, can the SUBSCRIPTS in chemical formulas be changed to balance an equPer NCERT, the balanced equation for the COMBUSTION OF PROPANE (C₃H₈) with oxygen is which?Per NCERT, MOLARITY (M) of a solution is defined as which?Per NCERT Problem 1.7, what is the molarity of NaOH when 4 g NaOH is dissolved in enough water to form 250 mL Per NCERT, MOLALITY (m) of a solution is defined as which ratio?Per NCERT, what is the KEY DIFFERENCE between MOLARITY and MOLALITY — with respect to TEMPERATURE?Per NCERT, what is MOLE FRACTION (x) of a component A in a solution?Per NCERT, mass % (w/w%) is given by which formula?The molecular mass of water H$_2$O (using H = 1, O = 16) is:One mole of any substance contains:In the reaction $2H_2 + O_2 \to 2H_2O$, $4$ moles of $H_2$ are mixed with $1$ mole of $O_2$. The mass of waterA solution contains $0.5$ mol NaCl in $2$ L of solution. Its molarity is: