Explore topic-wise InterviewSolutions in .

Calcium is obtained by

Which gas is commonly used as a fire extinguisher?

Define the following terms :

(a) Condensation (b) Freezing

Choose the correct option regarding the uses of washing soda:

Match List I with List II and select the correct answer using the codes given below the lists

List I (Compound) List II (Oxidation state of N)

(A) $N{O}_2$ (1) +5

(B) $HNO$ (2) -3

(C) $N{H}_3$ (3) +4

(D) $N_2{O}_5$ (4) +1

What is meant by saying that metals are malleable and ductile ?

What is the atomicity of the following ?

(a) Oxygen

(b) Ozone

(c) Neon

(d) Sulphur

(e) Phosphorus

(f) Sodium

There are three liquids A, B and C, all having different densities and different boiling points. Liquids A and C are organic in nature whereas liquid B is considered to be inorganic. When liquids A and B are put together in a container, they form a single layer. On the other hand, when, liquids B and C are mixed, they form two separate layers :

(a) Which process will you use to separte a mixture of A and B ?

(b) Which method will you use to separate a mixture of B and C ?

(c) Name the liquids which would behave like (i) A (ii) B and (iii) C.

(a) What are radioactive isotopes ? Give two examples of radioactive isotopes.

(b) Give any two uses of radioactive isotopes.

(c) An element Z contains two naturally occurring isotopes ${}_{17}^{35}Zand{}_{17}^{37}Z$. If the average atomic mass of this element be 35.5 u, calculate the percentage of two isotopes.

The atomic number of an element X is 8 and that of element Y is 4. Both these elements can exhibit a valency of :

(a) 1

(b) 2

(c) 3

(d) 4

The word atom is derived from Greek word - Atomos which means

The chemical formula of ammonium nitrate is _________.

When a substance is dissolved in a solvent, the vapour pressure of solvent decreases. It means?

Which of the given compounds has the formula ${\mathrm{NaHCO}}_3$?

What is the difference between plasma and gas

Before some minutes I asked a question that how can we separate 2 differ flours from physical method.than you said that it isn't possible so tell me why even when it is a physical mixture

Give two reasons to justify [5 MARKS]

(a) Water at room temperature is a liquid.
(b) An iron almirah is a solid at room temperature.

H-bonding is maximum in _____

Statement 1: Hydrogen atom just needs 1 extra electron to fill its outer-most orbit.

Statement 2: The first orbit can occupy only 2 electrons.

Water is heated from 0°C to 10°C. How does the density of water change with temperature?

Naphthalene balls disappear with time without leaving any solid residue. Why? [1 MARK]

What is the molality of a solution having 14.2 gm of $N{a}_{2}S{O}_4$ dissolved in 1 liter solution?

Which of the following represents the correct electron distribution in magnesium ion?

Which of the following hydrocarbons is/are not an example of saturated hydrocarbons?

CHOOSE THE BEST OPTION:

STATEMENT 1: A pure substance consists of a single type of matter.

STATEMENT 2: A pure substance consists of more than one type of matter.

STATEMENT 3: Milk is a not a pure substance.

STATEMENT 4: Pure substance has same chemical nature.

Question 1
Compare the properties of electrons, protons and neutrons?

A solid mixture contains four constituents P, Q, R and S.P consists of tiny grains and it is mixed with cement for plastering the walls. Q is a white solid which is recovered on a large scale from sea water by the process of evaporation. R is in the form of tiny particles of a material whose corrosion is called rusting. And S is a white-solid which is used in making ordinary dry cells.

(a) What could P, Q, R and S be ?

(b) How would you separate a mixture containing P, Q, R and S ?

Which of these have inter-molecular hydrogen bond?

What are the correct sets of Atomic masses (u) and Elements?

(i) N-14

(ii) Sulphur-34

(iii)Chlorine-36

(iv) Mg-24

(v) Cl-35.5

(vi) Oxygen-8

(vii)Na-23

Which mixture is labelled incorrectly?

Classify the following into solutions, suspensions and colloids :

Soda-water, Milk, Brine, Blood, Ink, Smoke in air, Chalk water mixture, Milk of Magnesia, Shaving cream, Muddy river water.

The mass numbers of three isotopes of an element are 10, 12, and 14 units. Their percentage abundance is 80, 15 and 5, respectively. What is the atomic weight of the element?

Which amongst the following will not displace hydrogen gas from dilute hydrochloric acid?

What is acetone solution?

$M+H_{2}S{O}_4\to MS{O}_4+H_2$

$M+2NaOH\to N{a}_{2}M{O}_2+H_2$. $M$ is

if electrons are getting added to an element Y; then: i) is Y getting oxidized or reduced, ii) what charge will Y migrate to during the process of electrolysis?

What is the ratio of hydrogen atoms present in heptyne to that in butene?

According to the Bohr's model of a hydrogen atom, what would be the ratio of Bohr's radius of ${}_1$H${}^1$, ${}_1$H${}^2$ and ${}_1$H${}^3$ be?

What are the characteristics of a period?

If the pressure is doubled for a fixed mass of a gas at constant temperature, What will be the effect on its volume?

For any situation why does the temperature remain constant during the change of state