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What is the change in colour observed when turmeric is added to a base?

Which of the following best describes solids?

How would you obtain sodium chloride from a mixture of sodium chloride and sulphur without using water?

Give example for alloys

Defination of single phase

Name the Irish scientist who is considered as the 'Father of Chemistry' and proposed the first modern definition of an element.

In the formula $CaB{r}_2$​ what does Ca stand for and what is its valency?

Would you cool a bucket of water more quickly by placing it on ice by placing ice in it ?Give reasons for your answer.

Is there any other difference in the atomic structure of bohr and Rutherford except that of shells?

When an electron in a hydrogen atom is excited from its $4^{th}$ to $5^{th}$ stationary orbit, the change in angular momentum of the electron is $(h=6.6\times {10}^{-34}\text{Js})$

Which of the following covalent compounds become electrovalent when dissolved in water?

What are supersaturated solution give some examples

Which postulate of Dalton's atomic theory is the result of law of conservation of mass given by Lavoisier?

Arrange the following elements in the increasing order of metallic character: B, Al, Mg, K.

The Rutherford’s atomic model was revised by _______ .

From the options below which one is Pyrosilicate ion?

1. On adding an element 'X' to caustic soda, a salt is produced along with a gas. The gas formed in the process when bubbled through soap solution burns with a pop sound when a burning candle is brought near it. Also, 'X' is used in the process of galvanisation. What will 'X' produce with HCl?

Why should we wear cotton clothes in summer?

Question 3(ii)

Express the number appearing in the following statements in standard form:

Charge of an electron is 0.000,000,000,000,000,00016 coulomb.

D₂O is known as:

1. 49.6

Based on the lattice energy and other considerations, which of the following alkali metal chloride is expected to have highest melting point?

What are pure substances ? Give two examples of pure substances.

For an Ideal Gas number of moles per liter in terms of its partial pressure (P), Gas constant (R) and temperature (T) is

The molar conductance of $NaCl,HCl$ and $C{H}_{3}COONa$ at infinite dilution are $126.45,426.16$ and $91.0Sc{m}^{2}mo{l}^{–1}$ respectively. The molar conductance of $C{H}_{3}COOH$ at infinite dilution is.

Choose the right option for your answer.

Statement 1: The solubility of sodium sulphate first increases then decreases.

Statement 2: This represents anomalous solubility of sodium sulphate.

The standard reduction potential for the half-cell reaction, $C{l}_2+2e^{-}\to 2C{l}^{-}$ if:

$P{t}^{2+}+2C{l}^{-}\to Pt+C{l}_2,E_{\text{cell}}^o=-0.15V$

$P{t}^{2+}+2e^{-}\to Pt,E^o=1.20V$