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Chemistry

Q.21) The mass number of a nucleus is

(A) always less than its atomic number

(B) the sum of the number of protons and neutrons present in the nucleus

(C) always more than the atomic weight

(D) a fraction

Q.22) The hydronium ion is

(A) H+

(B) HO -

(C) H2+

(D) H3O+

Q.23) The most electropositive elements among the following is

(A) Na

(B) Ca

(C) K

(D) Cs

Q.24) The method that cannot be used for removing permanent hardness of water is

(A) adding sodium carbonate

(B) distillation

(C) adding caustic soda

(D) boiling

Q.25) Zone refining is used for the purification of

(A) Au

(B) Ge

(C) Ag

(D) Cu

Q.26) The high reactivity of fluorine is due to

(A) its high electro negativity

(B) small size of fluorine atom

(C) availability of d-orbitals

(D) strong F - F bond

Q.27) The major constituent of air is

(A) nitrogen

(B) carbon dioxide

(C) oxygen

(D) hydrogen

Q.28) The main chemical constituent of clay is

(A) silicon oxide

(B) aluminium borosilicate

(C) zeolites

(D) aluminium silicate

Q.29) The mineral containing both magnesium and calcium is

(A) magnesite

(B) calcite

(C) carnallite

(D) dolomite

Q.30) The main active constituent of tea and coffee is

(A) nicotine

(B) chlorophyll

(C) caffeine

(D) aspirin

ਜੇਕਰ ਤੁਸੀ ਕਿਸੇ ਵੀ ਸਰਕਾਰੀ ਨੌਕਰੀ ਬਾਰੇ ਜਾਣਕਾਰੀ ਲੈਣਾ ਚਾਹੁੰਦੇ ਹੋ ਤਾ ਉੱਤੇ ਦਿੱਤੇ ਕੰਮੈਟ ਬਾਕਸ ਵਿੱਚ ਕੰਮੈਟ ਕਰ ਸਕਦੇ ਹੋ ਧੰਨਵਾਦ ਅਰਨ ਮਨੀ ਜੋਬਜ ਟੀਮ