Which of the following compounds shall not produce propene by reaction with HBr followed by elemination (or) only direct elimination reaction (NEET)__________

Among the alkali metals which one form compounds with more covalent character?

Which one of the following is not an isoelectronic ion?

Which of the following is not a metalloid (or) semi-metal?

Which one of the following is used as a desulphurising agent for iron and steel?

Consider the following statements.
(i) Beryllium has small size and high polarizing power.
(ii) Beryllium does not have d-orbitals in its valence shell.
(iii) Beryllium has low electronegativity and very low ionization enthalpy as compared to other alkaline earth metals.
Which of the above statements is/are not correct?

Consider the following statements.
(i) Oxidation character increases from left to right in a period.
(ii) Reducing character increases from left to right in a period.
(iii) Metallic character increases from left to right in a period.
Which of the above statement is/are not correct?

Which one of the following is called halogen family?

Among the following, which is the fifth most abundant element?

Which one of the following alkali metals is highly reactive with water?

Consider the following statements.
(i) Alkali metals exhibit high chemical reactivity due to their low ionization energy.
(ii) Lithium is a very soft metal and even it can be cut with a knife.
(iii) Francium is a radioactive element in group 1 elements
Which of the above statements is/are not correct?

Rock salt is major source of ________

Which set of the metals do not have any effect on water?

Which of the following is produced by bombardment of neutrons with lithium?

Consider the following statements.
(i) In ortho form of hydrogen molecule, the nuclear spins are opposed to each other.
(ii) The magnetic moment of para hydrogen is twice that of ortho hydrogen.
(iii) By passing an electric discharge, para hydrogen can be converted into ortho hydrogen.
Which of the above statement is/are not correct?

The number of d- electrons in Fe⁺² (Z = 26) is not equal to the number of electrons in which one of the following?

The reagent used for softening of the temporary hardness of water is/are
(i) Ca₃ (PO₄)₂    
(ii) Ca(OH)₂         
(iii) Na₂CO₃   
(iv) NaOCI

Consider the reactions:
(i) H₂O₂ + 2HI \(\rightarrow\) I₂+ 2H₂O
(ii) HOCI + H₂O₂ \(\rightarrow\) H₃O⁺+ CI^- + O₂
Which of the following statements is correct about H₂O₂ with reference to the above reactions?

Choose the correct statement with regard to ortho and para hydrogen.
1. Both have similar chemical properties but differ in some physical properties.
2. The boiling points of normal, ortho and para hydrogens are the same.
3. The nuclear spin in both forms are the same.
4. Para hydrogen has zero magnetic moment.

Match the list I with List II and select the correct answer using. the code given below the lists.

_________ is the cofactor of all enzymes that utilize ATP in phosphate transfer and energy release.

In a closed room of 1000 m³ a perfume bottle is opened up. The room develops smell. This is due to which property of gases _____________

Find out the correct statement with respect to alkali metals.

If the energy of an electron in the second Bohr orbit of H-atom is -E, what is the energy of the electron in the Bohr's first orbit?

An ideal gas expands from the volume of 1 x 10^-3 m³ to 1 x 10^-2 m³ at 300 K against a constant pressure at 1 x 10⁵ Nm^-2. The work done is ______________