A substance P is added to substance Q and if their properties remains same then the addition of P into Q forms

If A is added to B. If after addition A and B can't be distinguished then the resulting solution is ?

Mixture of sand and sugar is the example of

Which method is used to separate the component from the mixture ?

In pure substance, the separation of metal can be carried out by which method ?

State whether following statement is true or false ?
Glucose ( C₆H₁₂O₆ ) is a pure substance.

A material consists of same type of atoms, the material could be?

Which of the following is not an example of compounds?

Which of the following is an example of compounds?

On vaporization , 0.24 g of volatile gas gives, 45 ml vapour at NTP. find the vapour density of the substance ?

Which of the following is NOT a way that matter changes phase?

The melting point of water is-

A phase change from Gas to Liquid is called _____.

The basic quantity in the International system of units, is

What is the SI unit of Thermodynamic temperature ?

Which of the following statement is correct ?

Force exerted by the gravity on an object is called as

The Fahrenheit scale is related to Celsius scale as

Fahrenheit scale is calibrated from

221 °F corresponds to?

What is the SI unit of density ?

Number 0.0000548 can be represented in scientific notation as

Distance of moon from earth is

Identify incorrect representation of scientific notation among the following

How scientific notation is represented ?

Find the addition of two numbers using scientific notation
23100 +342000

Find the subtraction of the following number
(2.5×10^-2)- (4.8×10^-3)

Find the division of (2.7×10^-3) / (5.5 ×10⁴)

Find the multiplication of (5.6× 10⁵) × (6.9× 10⁸) ?

Measurement which is close to true value is called as _____.

Systematic errors occur due to

A measurement which on repetition gives same or nearly same result is called

Systematic errors can be removed by

161 cm , 0.161 cm , 0.0161 cm are the three numbers given respectively.
Find the number of significant figures for them ?

Which of the following rule is incorrect for significant figure?

How many significant figures the number 12.0000 contains ?

Find the number of significant figures in the final answer of the following expression
(29.2 - 20.2 ) (1.79 × 10⁵) / 1.37

What volume of oxygen gas (O²) measured at 0⁰ C and 1 atm is needed to burn completely 1 L of propane gas (C₃H₈) measured under the same conditions ?

According to Hoffman’s definition chemistry is

Choose incorrect among the following :

Choose incorrect among the following

Choose correct among the following

Knowledge of chemistry helps in production of

What is matter?

State whether the following statement is true or false?
The states of matter are inter-convertible

In which state of matter the particles are very closely bound to each other ?

Which of the following statement is correct ?

Water vapour is the example of which state of matter ?

Specify the correct sequence based on molecular distance ?

What is the law of conservation of mass ?

Who proposed the law of Multiple Proportions ?

What mass of silver nitrate will react with 5.85g of sodium chloride to produce 14.35 g of silver chloride and 8.5 g of sodium nitrate if law of conservation of mass holds true ?

Which scientific law states that elements combine in fixed ratios to form compounds?

Which law states direct relationship between temperature and pressure ?

What is the Avogadro's law?

What is the constant value for avogadro's number ?

In Avogadro's law volume is directly proportional to _____.

State which of the following statement is incorrect ?

In which year Dalton published ‘A New System Of Chemical Philosophy‘ ?

Dalton’s atomic theory successfully explained _____
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportion

In which year Dalton developed Atomic theory ?

Calculate the average atomic weight of boron in the periodic table if it has the two stable isotopes   ¹⁰B(99%) and   ¹¹B(81%) respectively ?

For the complete combustion of 2.8 kg of ethylene , the weight of oxygen required is :

X has the following isotopic composition
²⁰⁰X : 90% , ¹⁹⁹X : 8.0% , ²⁰²X : 2.0%
Find the weighted average atomic mass of the naturally occurring element X ?

Find the atomic weight of the metal, whose oxide have the formula Z₂O₃. The metal oxide can be reduced by hydrogen to give free metal and water. where 6 mg of hydrogen is required by the 0.1596 g of metal oxide for its complete reduction ?

Find the mass of carbon anode used, when 270 kg of aluminium metal is produced from bauxite during hall process ? (atomic mass of Al =27)

Calculate the molecular mass of glucose ( C₆H₁₂O₆) molecule ?

What is mean by molecular mass ?

What is the formula mass of NaCl ?

Cookies and bread rise due to

How much atoms are present in 0.1 mole of triatomic gas (N_A=6.023×10²³ mol^-1)

Which of the following has maximum number of molecules ?

How much molecules are present in 15 L of H₂ gas at STP ?

How many number of oxygen atoms are present in 4.4 gm of CO₂ ?

What will happen when 1 mole of ammonia reacts and 1 mole of O₂ undergo following reaction till completion.
4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(l) ?

The percentage weight of Zn in white vitriol [ZnSO₄.7H₂O] is approximately equal to (at.mass of Zn = 65 ,S = 32 , O = 16 and H=1 )

What is the mass of hydrogen in water ?

In Sulfuric Acid (H₂SO₄), chemical composition of sulfur is_____.

In Na₂CO₃ · 10H₂O, percentage of oxygen is_____.

When a hydrocarbon undergoes complete combustion it produces_____.

Which of the following is true in a balanced chemical reaction ?

What will be the balanced product(s) of the following reaction-
CH₄ + 2 O₂ → ?

Which of the following symbols is not a correct indication of the phase of a substance in a reaction?

Balance the given equation C₃H₈ + O₂ → CO₂ + H₂O

Balance the given equation:
KMnO₄ + H₂SO₄ ⟶ K₂SO₄ + MnSO₄ +H₂O + O₂

Zn + HNO₃ ⟶ Zn(NO₃)₂ + N₂O + H₂O . Choose correct balanced form of equation.

How much amount of water will be produced when 10 g of hydrogen and 64 gm of oxygen were filled in a steel vessel and exploded ?

Law of definite proportion is obeyed in_______.

How many moles of methane are required to produce 22 g CO₂ (g) after combustion ?

If the 6.5 g of PbO and 3.2 g of HCl are reacted together then find the number of moles of lead (II) chloride during reaction ?

Which of the following shows a correct way to balance the chemical equation:
Fe  +  O₂   →   Fe₂O₃

Balance the given equation
Fe₂(SO₄)₃ + NH₃ + H₂O ⟶ Fe(OH)₃ + (NH₄)₂SO₄

I₂ + HNO₃ ⟶ HIO₃ + NO₂ + H₂O. Balanced form of given equation is

When 11.2 L of Cl₂(g) is mixed with 22.4 L of H₂ (g) , each at STP, find the moles of HCl formed ?

In a closed vessel , 0.56 g of oxygen is burnt with the 1.0 g of magnesium. which reactant is left in excess and how much ?

A solution is prepared by adding 2 g of a substance A to 18 g of water. Calculate the mass percent of the solute ?

What is the formula for mass percent of solvent ?

What is mole fraction ?

A 5.2 molal aqueous solution of methyl alcohol, CH₃OH is supplied. What is the mole fraction of methyl alcohol in the solution?

The molecular weight of haemoglobin is approximately 67200 g. Iron in haemoglobin is 0.33% by weight. Find the number of iron atoms (atomic weight of Fe is 56 ) present in one molecule of haemoglobin?

Find the minimum molecular weight of peroxidase anhydrase enzyme when 0.5%
(at.weight = 78.4) of Se is present in it ?

Find the molecular weight of cylindrical virus whose radius and length are 7⁰A and 10⁰A respectively and its specific volume is 6.02×10^-2 CC/g. ( NA= 6.023 × 10²³ )

Find the concentration of urea solution, when 6.02 × 10₂₀ molecules of urea are present in 100 mL ?

Find the mole fraction of solute whose aqueous solution is 1.00 molal ?

Under standard conditions, 1 L of air contains 21 % of oxygen by volume. find the number of moles of oxygen present in it ?

For preparation of 250 mL of 2.0 M HNO₃ , how many grams of concentrated nitric acid solution can be used ? The concentrated acid is 70 % HNO₃.