Atomic Structure

If n = 6, the correct sequence for filling of electrons will be :

For which one of the following sets of four quantum numbers, an electron will have the highest energy?

Consider the elements of group-14. Choose the correct alternative:

a) Si and Ge are semiconductors

b) Carbon and silicon are non-metals

c) Sn and Pb are metals

d) Si and Ge are metalloids

A substance that oxidises itself and reduces other is-

Which compound has the weakest bond?

How many oxygen atoms are present in a molecule of potassium permanganate?

The electronic configuration of curium $\left(Z=96\right)$ is

Which one of the following processes involves chemical reactions?

A substance which brings a chemical change about substance is called 

Aluminium window frames do not corrode away because the aluminium is: 

An element X (atomic number 12) reacts with another element Y (atomic number 17) to form a compound Z. Which of the following statements are true regarding this compound?

 $1.$ Molecular formula of Z is $X{Y}_2$

$2.$ It is soluble in water.

$3.$ X and Y are joined by sharing of electrons.

$4.$ It would conduct electricity in the molten state.

Codes:

When chlorine gas is passed through an aqueous solution ofKBr, the solution turns orange brown due to the formation of

A chemist's report on a batch of pharmaceutical products, Aspirin (C9Hp4) (250 mg tablets) and Paracetamol (C8H9NO) (500 mg tablets) indicated a '+0.5%' weight error in each tablet. Due to this error, the consumer gets extra 'x' molecules of aspirin per tablet and extra 'y' molecules of paracetamol per tablet. Choose the 'best' relation between x and y.

When the neutral X atom is compared to the ion of another element Y, which of the following could be the same?

(i) Proton numbers

(ii) Electron numbers

(iii) Neutron numbers

(iv) Chemical properties

X and Y atoms are atoms of the same element. Which of the following is equal in X and Y?

(i) Proton numbers

(ii) Neutron numbers

(iii) Mass numbers

Which of the following matching is correct?
    Subatomic particle                                Scientist

1. Electron                                          (i) Crooks, Thomson

2. Proton                                            (ii) Goldstein

3. Neutron                                         (iii) Chadwick

$x{\mathrm{FeS}}_2+y{\mathrm{O}}_2\to {\mathrm{wFe}}_2{\mathrm{O}}_3+{\mathrm{SO}}_2$

Identify $x,y,\; and z$ in the above chemical equation

Which one of the following processes involves chemical reactions?

Match the items of Column 1 and Column 2.

          Column 1                                                                                                                   Column 2 

1. Atom with two neutrons, one proton, and one electron                                         (1) Mass number

2. Sum of protons and neutrons in an atom                                                              (2) Neutron

3. Atoms with different nuclear charges but the same number of (p+n)                           (3) Tritium

4. Subatomic particle which is as massive as a proton but neutral                             (4) Isotones