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What are the limitations of Rutherford model of atom?

What happens when the temperature of a saturated sugar solution is increased?

State any two properties for believing that aluminium is a metal.

Pick the correct option.
An acid base reaction that is followed by an effervescence of $C{O}_2$.

What is difference between valency and charge of an atom?

What is chromatography, explain the procedure of chromatography with diagram

The metal Calcium upon reaction with water, forms bubbles of hydrogen gas. These gas bubbles stick to the surface of the metal making the metal to ___ on the water. Identify the correct option to fill in the blank.

Which of the following reaction can produce boron nitride 'BN'

Which among the following is present in aerated drinks ?

Which hydrocarbon compound helps in the ripening of fruits?

What is the structural formula of 2-Pentene?

Lead (II) oxide reacts with hydrogen to form

What is the meaning of this?

1 second is the time interval of 9192631770 vibrations of radiation corresponding to the transition between two hyperfine levels of the ground state of caesium 133 atom

Oxidant and Reductanct in the following reactions are respectively

$10H^{+}\left(aq\right)+4Zn\left(s\right)+N{O}_3^{-}\left(aq\right)\to 4Z{n}^{2+}\left(aq\right)+N{H}_4^{+}\left(aq\right)+3H_{2}O\left(l\right)$

What name is given to those isotopes which have unstable nuclei and emit various types of radiations ?

Which of the following statement(s) is/ are true ?

Which separation techniques will you apply for the separation of the following? [5 MARKS]

(a) Sodium chloride from its solution in water.
(b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.
(c) Small pieces of metal in the engine oil of a car.
(d) Different pigments from an extract of flower petals.
(e) Butter from curd.
(f) Oil from water.
(g) Tea leaves from tea.
(h) Iron pins from sand.
(i) Wheat grains from husk.
(j) Fine mud particles suspended in water.

Compounds made up of carbon and hydrogen only are called

What is the number of oxygen atoms present in 5 moles of sulphuric acid $\left(H_{2}S{O}_4\right)$?

Question 17
Give the chemical formulae for the following compounds and compute the ratio by mass of the combining elements in each one of them.

(a) Ammonia

(b) Carbon monoxide

(c) Hydrogen chloride

(d) Aluminium fluoride

(e) Magnesium sulphide

The valency of barium in barium chloride is _____.

How is the rate of a chemical reaction affected by change in temperature? Give an example in support of your answer.

Who discovered radioactivity?

Which of the following can be called a suspension ?

(a) milk (b) milk of magnesia (c) salt solution (d) vinegar

Hanny - smith formula for calculating the percentage of ionic character is

Why do we experience a burning sensation when come in contact with steam?

Aqueous solution of borax reacts with two mol of acids. This is because of -

What is the chemical formula of a compound made of Nitrogen and Oxygen with the mass ratio of 7:8?

How many molecules make 18 grams of $H_{2}O$?

Assertion: Aluminium foil cannot be used in $\alpha$ - particle scattering experiment
Reason: Aluminium is a highly malleable metal.

ABC is a ∆ & G(4, -3) is the centroid of the ∆. If A(1, -3); B(4, b) & C(a, -1). Find a & b and also length of side BC.

Chile saltpetre is

The formula for calculating concentration is given by which of the following:

(i) $\frac{massofsolute}{massofsolution}\times 100$

(ii) $\frac{massofsolute}{massofsolute+solvent}\times 100$

(iii) $\frac{massofsolvent}{massofsolution}\times 100$

(iv) $\frac{massofsolvent}{massofsolute+solvent}\times 100$

(v) $\frac{massofsolute}{volumeofsolution}\times 100$

(vi) $\frac{massofsolvent}{volumeofsolution}\times 100$

(a) Describe Thomson's model of the atom. Which subatomic particle was not present in Thomson's model of the atom?
(b) The mass number of an element is 18. It contains 7 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?

Explain why, a small volume of water in a kettle can fill a kitchen with steam .

Sea water can be classified as:

Which of the following atoms and ions are isoelectronic i.e. have the same number of electrons with the neon atom

Name any two laws of chemical combination.

The vapour density of a gas is $11.2$. The volume occupied by $11.2g$ of the gas at S.T.P. is

The process through which a solid directly changes to a gaseous state without passing through a liquid state is called as _______ .

When iron is added to copper sulphate solution then resultant reaction occur is a type of:-