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Name the salt which is mixed with carbon dioxide and calcium carbonate in the manufacturing of glass.

Nitrogen dioxide dissolves in atmospheric moisture or rainwater in the presence of oxygen to form_____.

Atoms can achieve octet by:

Which of the following is soluble in alcohol?

An ion X²⁺ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.

When the mixture of manganese dioxide and concentrated hydrochloric acid is subjected to heat

Phosphine is obtained by the reaction when:

What exactly are collides and collidal solutions?

Discovery of what led to the failure of Dalton's atomic theory? [2 MARKS]

What are different ways to separate solid mixtures? [2 MARKS]

Which of the following is a metal?

A planet of mass$m$is in an elliptical orbit about the sun $(m$≪ $M_{sun}$) with an orbit period $T$. If $A$ be the area of orbit, then its angular momentum would be :

What is a neutron? State its relative mass and charge.

The charge on an electron is..................

One atomic mass unit is _______ of the mass of one atom of _________ isotope.

What is a proton? State the relative mass and charge.

When a solid melts its temperature remains constaint. Give reason

Why does an atom of an element combines with another atom to form a molecule

Complete the following reaction $2Zn+\mathrm{2........}\to Z{n}^{2+}+........$

When we put acetone (nail polish remover) on our hand, we feel cold. Why?

If matter would have been continuous rather than particulate, can you tell what would happen on application of pressure on a gas?

What is a Concentration gradient??

Write down the four points regarding the nature and characteristics of particles

What are water gossien ? Explain

What is Valency and atomic mass of all elements in whole number?

Give only 1 valency and atomic mass for 1 elements.

What is the function of ozone in the atmosphere ?

Q1)Why do liquids have onle one free surface?

Q2)Why solid CaCl2 spreads on road in cold countries during winter season?

Q3)Why only specific solids like napthalene balls undergo sublimation?

Q4)Why cool sensation is observed when alcohol is poured on palm?

A glass of water and egg white mixed together is kept away. How much time will it take to settle down?

Protons are formed by___ of one or more electrons from the gaseous atom.

Which of the following absorb moisture from air:

Which of the following apparatus are used during the distillation process ?

The elements of one short period of the Periodic Table are given below in order from left to right :

Li Be B C O F Ne

(a) To which period do these elements belong ?

(b) One element of this period is missing. Which is the missing element and where should it be placed ?

(c) Place the three elements fluorine , beryllium and nitrogen in the order of increasing electronegativity.

(d) Which one of the above elements belongs to the halogen series ?

(a) When an incense stick (agarbatti ) is lighted in one corner of a room, its fragracne quickly spreads in the entire room. Name the process involved in this.

(b) A girl is cooking some food in the kitchen, The smell of food being cooked soon reaches her brother's room, Explain how the smell could have reached her brother's room.

Why does the temperature of a substance remain constant during the change of state?

Which of the following are the correct characteristics of isotopes of an element?

(i) same atomic mass (ii) same atomic number

(iii) same physical properties (iv) same chemical properties

(a) (i), (ii) and (iv) (b) (ii), (iii) and (iv) (c) (ii) and (iii) (d) (ii) and (iv)

The solubility curve is a graph between solubility of a __________ in a solvent against changing __________ .

what is ph

The empirical formula of an organic gas containing carbon and hydrogen is CH₂. The mass of 1 litre of this organic gas is exactly equal to that of 1 litre of N₂. Therefore, the molecular formula of organic compound is:

Which among the following is the active voice of the sentence?
Did I bake this cake?

Which of the following compounds are required for the laboratory preparation of nitric acid?

Difference between fractional distillation and distillation