alleryA metal rod is 5 inches long. What is its length in centimetres?
- 2.54 cm
- 1.97 cm
- 12.7 cm
- 127 cm
Show answer and solution
Correct answer: C. 12.7 cm
Multiplying by the unit factor 2.54 cm per inch gives 5 x 2.54 = 12.7 cm.
NEET UG Some Basic Concepts of Chemistry — practice questions — page 3
Explore 105 free Some Basic Concepts of Chemistry questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.
Practise Some Basic Concepts of Chemistry with Quill →Some Basic Concepts of Chemistry questions and exercises with answers
Showing questions 61–90 of 105.
A metal rod is 5 inches long. What is its length in centimetres?Read the answer and worked solution →Which scientist concluded that matter can neither be created nor destroyed?Read the answer and worked solution →Which chemist gave the law of definite proportions?Read the answer and worked solution →Proust compared natural and synthetic samples of which compound?Read the answer and worked solution →Oxygen masses joined to a fixed mass of hydrogen in water and in hydrogen peroxide are in what ratio?Read the answer and worked solution →12 g of carbon joins 16 g of oxygen in CO and 32 g in CO2. Which law does this show?Read the answer and worked solution →In which year did Gay Lussac give his law of gaseous volumes?Read the answer and worked solution →At the same temperature and pressure, 300 mL of hydrogen combines with how much oxygen to form water vapour?Read the answer and worked solution →Equal volumes of all gases at the same temperature and pressure contain equal:Read the answer and worked solution →At the 1860 international chemistry conference, who stressed the importance of Avogadro's work?Read the answer and worked solution →Which law could Dalton's atomic theory not explain?Read the answer and worked solution →Which statement is a postulate of Dalton's atomic theory?Read the answer and worked solution →Which isotope is the present standard for atomic masses?Read the answer and worked solution →One atomic mass unit is defined as exactly:Read the answer and worked solution →Chlorine is 75.77% Cl-35 (34.97 u) and 24.23% Cl-37 (36.97 u). Its average atomic mass is about:Read the answer and worked solution →The atomic mass values normally quoted for elements are:Read the answer and worked solution →Allowing for its isotopes, the average atomic mass of carbon is about:Read the answer and worked solution →For which substance is formula mass used instead of molecular mass?Read the answer and worked solution →In a sodium chloride crystal, each Na+ ion is surrounded by how many Cl- ions?Read the answer and worked solution →Taking C = 12.01 u and O = 16.00 u, what is the molecular mass of CO2?Read the answer and worked solution →Using Ca = 40, C = 12 and O = 16, what is the formula mass of calcium carbonate, CaCO3?Read the answer and worked solution →What is the mass of one mole of a substance, expressed in grams, called?Read the answer and worked solution →How many water molecules are present in 9 g of water (molar mass 18 g/mol)?Read the answer and worked solution →How many moles of hydrogen atoms are present in 2 mol of propane, C3H8?Read the answer and worked solution →The molar mass of a substance in grams is numerically equal to its:Read the answer and worked solution →What is the mass per cent of carbon in CO2 (C = 12.01, molar mass 44.01 g/mol)?Read the answer and worked solution →What does an empirical formula of a compound represent?Read the answer and worked solution →A compound is 40.0% C, 6.7% H and 53.3% O by mass. What is its empirical formula?Read the answer and worked solution →How much water forms when 8 g of methane burns completely (CH4 + 2O2 gives CO2 + 2H2O)?Read the answer and worked solution →Where one mole of gas occupies 22.7 L, 22.7 L of methane burns completely in how much oxygen?Read the answer and worked solution →
Worked practice questions
Which scientist concluded that matter can neither be created nor destroyed?
- Antoine Lavoisier
- John Dalton
- Joseph Proust
- Joseph Gay Lussac
Show answer and solution
Correct answer: A. Antoine Lavoisier
Lavoisier's careful combustion experiments showed no net change in mass, giving the law of conservation of mass.
Which chemist gave the law of definite proportions?
- John Dalton
- Joseph Proust
- Amedeo Avogadro
- Antoine Lavoisier
Show answer and solution
Correct answer: B. Joseph Proust
The French chemist Joseph Proust stated that a compound always has the same proportion of elements by weight.
How to practise
- Choose a Some Basic Concepts of Chemistry question and try to work out your answer.
- Open the question to check the correct answer and read its worked solution.
- Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.
Put it into practice
Continue with Some Basic Concepts of Chemistry practice for NEET UG. Read explanations as you go. No signup form needed to start.
Practise Some Basic Concepts of Chemistry →