Some Basic concepts of chemistry - Pyqs

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Q1
The number of significant figures in \(0.004560\) is:
(Exam: IIT-JEE Year: 1998)
(A) 2
(B) 3
(C) 4
(D) 5
Q2
How many atoms are present in \(18\,g\) of water?
(Exam: AIPMT Year: 2006)
(A) \(3N_A\)
(B) \(N_A\)
(C) \(2N_A\)
(D) \(6N_A\)
Q3
Empirical formula mass of glucose \((C_6H_{12}O_6)\) is:
(Exam: NEET Year: 2017)
(A) 30
(B) 60
(C) 90
(D) 180
Q4
One mole of any substance contains:
(Exam: AIIMS Year: 2004)
(A) \(6.022\times10^{22}\) entities
(B) \(6.022\times10^{23}\) entities
(C) \(3.011\times10^{23}\) entities
(D) \(1.204\times10^{24}\) entities
Q5
The mass percent of oxygen in \(HNO_3\) is:
(Exam: IIT-JEE Year: 2001)
(A) 60.0%
(B) 63.5%
(C) 75.0%
(D) 76.2%
Q6
Which has maximum number of molecules?
(Exam: BITSAT Year: 2012)
(A) 2 g \(H_2\)
(B) 16 g \(CH_4\)
(C) 28 g \(N_2\)
(D) 44 g \(CO_2\)
Q7
Limiting reagent controls:
(Exam: IIT-JEE Year: 2003)
(A) rate
(B) equilibrium
(C) yield
(D) entropy
Q8
Density of a gas at STP is proportional to:
(Exam: KVPY Year: 2010)
(A) \(1/M\)
(B) \(M\)
(C) \(T\)
(D) \(P\)
Q9
5.6 L of \(N_2\) at STP corresponds to:
(Exam: AIPMT Year: 2009)
(A) 0.25 mol
(B) 0.5 mol
(C) 1 mol
(D) 2 mol
Q10
Which law explains conservation of mass?
(Exam: IIT-JEE Year: 1995)
(A) Dalton
(B) Gay-Lussac
(C) Lavoisier
(D) Avogadro
Q11
Moles of electrons in 1 mol \(Na\) atoms:
(Exam: NEET Year: 2018)
(A) 1
(B) 10
(C) 11
(D) 23
Q12
The percentage purity if 10 g impure \(CaCO_3\) gives 2.24 L \(CO_2\) at STP:
(Exam: IIT-JEE Year: 2004)
(A) 50%
(B) 75%
(C) 80%
(D) 100%
Q13
Which is not a state function?
(Exam: AIIMS Year: 2007)
(A) Enthalpy
(B) Internal energy
(C) Work
(D) Entropy
Q14
Significant figures in \(2.300\times10^2\):
(Exam: BITSAT Year: 2014)
(A) 2
(B) 3
(C) 4
(D) 5
Q15
Mole fraction of \(NaCl\) in 1 mol \(NaCl\)+2 mol \(H_2O\):
(Exam: IIT-JEE Year: 2006)
(A) 1/3
(B) 1/2
(C) 2/3
(D) 1/4
Q16
The molarity of pure water at \(25^\circ C\) is approximately:
(Exam: IIT-JEE Year: 2002)
(A) 18
(B) 55.5
(C) 1000
(D) 1
Q17
Which of the following has the highest mass?
(Exam: NEET Year: 2016)
(A) 1 mol electrons
(B) 1 mol protons
(C) 1 mol neutrons
(D) 1 mol hydrogen atoms
Q18
The limiting reagent is:
(Exam: IIT-JEE Year: 1999)
(A) reactant in excess
(B) reactant consumed completely
(C) catalyst
(D) solvent
Q19
The number of moles of \(Na^+\) ions in 1 mol \(Na_2CO_3\) is:
(Exam: AIPMT Year: 2010)
(A) 0.5
(B) 1
(C) 2
(D) 3
Q20
The molecular mass of a gas is directly proportional to:
(Exam: KVPY Year: 2011)
(A) diffusion rate
(B) effusion rate
(C) density
(D) temperature
Q21
Which pair obeys the law of multiple proportions?
(Exam: IIT-JEE Year: 1996)
(A) \(H_2O\) and \(H_2O_2\)
(B) \(CO\) and \(CO_2\)
(C) \(NO\) and \(NO_2\)
(D) All of these
Q22
The SI unit of amount of substance is:
(Exam: AIIMS Year: 2003)
(A) gram
(B) kilogram
(C) mole
(D) equivalent
Q23
How many significant figures are there in \(0.02030\)?
(Exam: BITSAT Year: 2015)
(A) 2
(B) 3
(C) 4
(D) 5
Q24
Which is an intensive property?
(Exam: NEET Year: 2019)
(A) Mass
(B) Volume
(C) Enthalpy
(D) Density
Q25
The percentage of nitrogen in urea \((NH_2)_2CO\) is:
(Exam: IIT-JEE Year: 2000)
(A) 33.3%
(B) 46.7%
(C) 50.0%
(D) 66.7%
Q26
Which quantity remains constant during a chemical reaction?
(Exam: IIT-JEE Year: 1994)
(A) Volume
(B) Temperature
(C) Mass
(D) Pressure
Q27
The volume occupied by 2 mol of an ideal gas at STP is:
(Exam: AIPMT Year: 2008)
(A) 11.2 L
(B) 22.4 L
(C) 33.6 L
(D) 44.8 L
Q28
Which unit is used for molality?
(Exam: BITSAT Year: 2013)
(A) mol/L
(B) mol/kg
(C) g/L
(D) g/mol
Q29
If the empirical formula mass is 30 and molecular mass is 180, the molecular formula is:
(Exam: NEET Year: 2020)
(A) \(CH_2O\)
(B) \(C_2H_4O_2\)
(C) \(C_6H_{12}O_6\)
(D) \(C_{12}H_{24}O_{12}\)
Q30
Which law explains gaseous volume ratios?
(Exam: IIT-JEE Year: 1997)
(A) Boyle
(B) Charles
(C) Gay-Lussac
(D) Avogadro
Q31
The number of molecules in 11 g \(CO_2\) is:
(Exam: AIIMS Year: 2005)
(A) \(0.25N_A\)
(B) \(0.5N_A\)
(C) \(N_A\)
(D) \(2N_A\)
Q32
Which is not a unit of concentration?
(Exam: NEET Year: 2015)
(A) Normality
(B) Molarity
(C) Molality
(D) Density
Q33
Which contains maximum oxygen atoms?
(Exam: IIT-JEE Year: 2001)
(A) 1 mol \(H_2O\)
(B) 1 mol \(CO_2\)
(C) 1 mol \(O_2\)
(D) All equal
Q34
Avogadro number relates:
(Exam: AIPMT Year: 2007)
(A) mass to volume
(B) mass to number
(C) moles to entities
(D) volume to density
Q35
Which is a derived SI unit?
(Exam: IIT-JEE Year: 1993)
(A) mole
(B) kilogram
(C) second
(D) newton
Q36
The mass of 1 mole of electrons is approximately:
(Exam: KVPY Year: 2012)
(A) 1 g
(B) 0.55 g
(C) 0.00055 g
(D) negligible
Q37
Which reaction best demonstrates stoichiometry?
(Exam: IIT-JEE Year: 2005)
(A) Combustion
(B) Precipitation
(C) Neutralization
(D) All of these
Q38
The dimensional formula of molarity is:
(Exam: IIT-JEE Year: 2007)
(A) \(mol\,L^{-1}\)
(B) \(mol\,kg^{-1}\)
(C) \(M^0L^0T^0\)
(D) \(mol\,m^{-3}\)
Q39
Which statement is correct?
(Exam: NEET Year: 2021)
(A) Molality depends on temperature
(B) Molarity is temperature independent
(C) Molality is temperature independent
(D) Both depend on temperature
Q40
22 g \(CO_2\) contains how many moles?
(Exam: AIPMT Year: 2005)
(A) 0.25
(B) 0.5
(C) 1
(D) 2
Q41
Which quantity has maximum numerical value?
(Exam: IIT-JEE Year: 2009)
(A) 1 g atom H
(B) 1 mol H
(C) 1 mole electrons
(D) 1 mole neutrons
Q42
The atomic mass unit is defined relative to:
(Exam: AIIMS Year: 2006)
(A) \(H\)
(B) \(O\)
(C) \(^{12}C\)
(D) \(^{16}O\)
Q43
Which is an extensive property?
(Exam: NEET Year: 2018)
(A) Temperature
(B) Pressure
(C) Density
(D) Internal energy
Q44
The number of significant figures in \(1.020\times10^{-3}\):
(Exam: BITSAT Year: 2016)
(A) 3
(B) 4
(C) 5
(D) 6
Q45
Which law explains why gases mix in all proportions?
(Exam: IIT-JEE Year: 1992)
(A) Boyle
(B) Dalton
(C) Avogadro
(D) Graham
Q46
The formula of washing soda is:
(Exam: NEET Year: 2014)
(A) \(Na_2CO_3\)
(B) \(NaHCO_3\)
(C) \(Na_2CO_3\cdot10H_2O\)
(D) \(Na_2SO_4\)
Q47
The number of moles of oxygen atoms in 1 mol \(H_2SO_4\):
(Exam: IIT-JEE Year: 2008)
(A) 1
(B) 2
(C) 3
(D) 4
Q48
Which quantity is conserved in a chemical reaction?
(Exam: AIPMT Year: 2011)
(A) Energy
(B) Mass
(C) Moles
(D) Volume
Q49
If the density of a gas is doubled at constant temperature, pressure becomes:
(Exam: IIT-JEE Year: 2010)
(A) half
(B) same
(C) double
(D) four times
Q50
The branch of chemistry dealing with quantitative relationships is:
(Exam: Olympiad Year: Standard)
(A) Thermodynamics
(B) Stoichiometry
(C) Kinetics
(D) Electrochemistry

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